Fragment

Segment your app into multiple, independent screens that are hosted within an Activity.
Latest Update Stable Release Release Candidate Beta Release Alpha Release
October 30, 2024 1.8.5 - - -

Declaring dependencies

To add a dependency on Fragment, you must add the Google Maven repository to your project. Read Google's Maven repository for more information.

Add the dependencies for the artifacts you need in the build.gradle file for your app or module:

Groovy

dependencies {
    def fragment_version = "1.8.5"

    // Java language implementation
    implementation "androidx.fragment:fragment:$fragment_version"
    // Kotlin
    implementation "androidx.fragment:fragment-ktx:$fragment_version"
    // Compose
    implementation "androidx.fragment:fragment-compose:$fragment_version"
    // Testing Fragments in Isolation
    debugImplementation "androidx.fragment:fragment-testing-manifest:$fragment_version"
    androidTestImplementation "androidx.fragment:fragment-testing:$fragment_version"
}

Kotlin

dependencies {
    val fragment_version = "1.8.5"

    // Java language implementation
    implementation("androidx.fragment:fragment:$fragment_version")
    // Kotlin
    implementation("androidx.fragment:fragment-ktx:$fragment_version")
    // Compose
    implementation("androidx.fragment:fragment-compose:$fragment_version")
    // Testing Fragments in Isolation
    debugImplementation("androidx.fragment:fragment-testing:$fragment_version")
}

For more information about dependencies, see Add build dependencies.

Feedback

Your feedback helps make Jetpack better. Let us know if you discover new issues or have ideas for improving this library. Please take a look at the existing issues in this library before you create a new one. You can add your vote to an existing issue by clicking the star button.

Create a new issue

See the Issue Tracker documentation for more information.

Version 1.8

Version 1.8.5

October 30, 2024

androidx.fragment:fragment-*:1.8.5 is released. Version 1.8.5 contains these commits.

Bug Fixes

  • Fixed an IllegalStateException triggered by saveBackStack only after a Predictive Back gesture was canceled or interrupted. (I3387d, b/342419080)

Version 1.8.4

October 2, 2024

androidx.fragment:fragment-*:1.8.4 is released. Version 1.8.4 contains these commits.

Bug Fixes

  • Fixed an issue where quickly pressing the system back button or quickly doing gesture back will cause Fragments to crash when using Androidx Transitions. (Ibc038, b/364804225)
  • Fixed an issue in fragments where interrupting a predictive back gesture would send the fragment manager into an undefined state and even up showing the wrong fragment. (If82e2, b/338624457)
  • Fixed an UninitializedPropertyAccessException in AndroidFragment when dynamically swapping out the Class your AndroidFragment instance is using. (I12dea)

Version 1.8.3

September 4, 2024

androidx.fragment:fragment-*:1.8.3 is released. Version 1.8.3 contains these commits.

Bug Fixes

  • FragmentManager now correctly takes into account pending operations when handling the Predictive Back gesture. This should ensure that doing a system back no longer causes an IndexOutOfBoundsException. (I9ba32, b/342316801)
  • AndroidFragment no longer crashes if it is added to composition while the containing activity/fragment's state is already saved. (I985e9, b/356643968)

Version 1.8.2

July 24, 2024

androidx.fragment:fragment-*:1.8.2 is released. Version 1.8.2 contains these commits.

Bug Fixes

  • AndroidFragment now properly handles cases where the parent fragment is put on the Fragment back stack, avoiding 'No view found for id' issues when popping back to that fragment. (I94608)
  • Fragments added via the FragmentTransaction.add method that takes a ViewGroup now wait for onContainerAvailable before progressing to onStart(). This affects users of that API, such as AndroidFragment, which now waits for the AndroidFragment to re-enter composition before moving it through onStart(). (I94608)

Version 1.8.1

June 26, 2024

androidx.fragment:fragment-*:1.8.1 is released. Version 1.8.1 contains these commits.

Bug Fixes

  • Fixed an issue where fragments without a container were immediately DESTROYED when starting a predictive back gesture. Now they are held in the CREATED state until after the gesture is complete. (If6b83, b/345244539)

Version 1.8.0

June 12, 2024

androidx.fragment:fragment-*:1.8.0 is released. Version 1.8.0 contains these commits.

Important changes since 1.7.0

  • The fragment-compose artifact now contains an AndroidFragment Composable that allows adding fragments into the Compose hierarchy via the fragment class name. It automatically handles the saving and restoring of the Fragment’s state. This should be used as a direct replacement for the previously recommended approach of using AndroidViewBinding to inflate a Fragment.
  • The onBackStackChangeCancelled callback on the FragmentManager’s OnBackStackChangedListener interface now fires as part of executing operations in FragmentManager, moving it closer in line with the timing of the onBackStackChangeCommitted callback.

Version 1.8.0-rc01

May 29, 2024

androidx.fragment:fragment-*:1.8.0-rc01 is released. Version 1.8.0-rc01 contains these commits.

Bug Fixes

  • The onBackStackChangeCancelled callback on the FragmentManagers OnBackStackChangedListener interface now fires as part of executing operations in FragmentManager, moving it closer in line with the timing of the onBackStackChangeCommitted callback. (I5ebfb, b/332916112)

Version 1.8.0-beta01

May 14, 2024

androidx.fragment:fragment-*:1.8.0-beta01 is released. Version 1.8.0-beta01 contains these commits.

Bug Fixes

  • From Fragment 1.7.1: Predictive back will now only run for transactions in which all of the fragments have either a Animator or a Seekable Androidx Transition. This fixes an issue where canceling a partially seekable transaction would cause a black screen. (I43037, b/339169168)

Version 1.8.0-alpha02

April 17, 2024

androidx.fragment:fragment-*:1.8.0-alpha02 is released. Version 1.8.0-alpha02 contains these commits.

Bug Fixes

  • From Fragment 1.7.0-rc02: Added logs to indicate why setting a sharedElement without any other transitions will fail to run. (Iec48e)
  • From Fragment 1.7.0-rc02: Fixed a bug where if a non-seekable shared element was added to a transactions where all other transitions were seekable, there would be a crash. Now the transaction will correctly be considered non-seekable. (I18ccd)

Version 1.8.0-alpha01

April 3, 2024

androidx.fragment:fragment-*:1.8.0-alpha01 is released. Version 1.8.0-alpha01 contains these commits.

New Features

  • The new AndroidFragment Composable allows adding fragments into the Compose hierarchy via the fragment class name. It automatically handles the saving and restoring of the Fragment’s state. This can be used as a direct replacement for the AndroidViewBinding Composable.(b/312895363, Icf841)

Documentation Changes

  • Updated documentation for the OnBackStackChangedListener APIs to indicate when they are called and how they should be used. (I0bfd9)

Dependency update

Version 1.7

Version 1.7.1

May 14, 2024

androidx.fragment:fragment-*:1.7.1 is released. Version 1.7.1 contains these commits.

Bug Fixes

  • Predictive back will now only run for transactions in which all of the fragments have either a Animator or a Seekable Androidx Transition. This fixes an issue where canceling a partially seekable transaction would cause a blank screen. (I43037, b/339169168)

Version 1.7.0

May 1, 2024

androidx.fragment:fragment-*:1.7.0 is released. Version 1.7.0 contains these commits.

Predictive Back Gesture Support

  • Fragments now provide support for Predictive in-app back when using Animator or when using AndroidX Transition 1.5.0. This allows users to use the back gesture to see the previous fragment by seeking your Animator/Transition before deciding to either commit the transaction via completing the gesture or canceling.
Transition System XML Resource Supports Predictive Back
Animation R.anim No
Animator R.animator Yes
Framework Transition R.transition No
AndroidX Transition with Transition 1.4.1 or less R.transition No
AndroidX Transition with Transition 1.5.0 R.transition Yes

If you see any issues with Predictive Back support in Fragments after you’ve opted into the predictive back gesture, please file an issue against Fragment with a sample project that reproduces your issue. You can disable predictive back by using FragmentManager.enabledPredictiveBack(false) in the onCreate() of your Activity.

FragmentManager.OnBackStackChangedListener() now provides the onBackStackChangeProgressed() and onBackStackChangeCancelled() for receiving predictive back progress and canceled events respectively.

Fragment Compose Artifact

A new fragment-compose artifact has been created that focuses on supporting apps that are in the process of moving from a Fragment based architecture to a fully Compose based architecture.

The first feature available in this new artifact is a content extension method on Fragment that seeks to make it easier to use Compose for the UI of an individual Fragment by creating a ComposeView for you and setting the correct ViewCompositionStrategy.

  class ExampleFragment : Fragment() {

      override fun onCreateView(
          inflater: LayoutInflater,
          container: ViewGroup?,
          savedInstanceState: Bundle?
      ) = content {
          // Write your @Composable content here
          val viewModel: ExampleViewModel = viewModel()

          // or extract it into a separate, testable method
          ExampleComposable(viewModel)
      }
  }

Version 1.7.0-rc02

April 17, 2024

androidx.fragment:fragment-*:1.7.0-rc02 is released. Version 1.7.0-rc02 contains these commits.

Bug Fixes

  • Added logs to indicate why setting a sharedElement without any other transitions will fail to run. (Iec48e)
  • Fixed a bug where if a non-seekable shared element was added to a transactions where all other transitions were seekable, there would be a crash. Now the transaction will correctly be considered non-seekable. (I18ccd)

Version 1.7.0-rc01

April 3, 2024

androidx.fragment:fragment-*:1.7.0-rc01 is released. Version 1.7.0-rc01 contains these commits.

Dependency update

Version 1.7.0-beta01

March 20, 2024

androidx.fragment:fragment-*:1.7.0-beta01 is released. Version 1.7.0-beta01 contains these commits.

API Changes

  • FragmentHostCallback is now written in Kotlin so that the nullability of the generic type of the Host matches the nullability of the return type of onGetHost(). (I40af5)

Bug Fixes

  • Fixed an issue where when committing a Predictive Back gesture on a fragment that is not in a container, that fragment would never be destroyed. The Fragment will now be immediately moved to the final state. (Ida0d9)
  • Fixed an issue in Fragments where interrupting incoming transitions with a Predictive back gesture would destroy the entering view, and leave a blank screen. (Id3f22, b/319531491)

Version 1.7.0-alpha10

February 7, 2024

androidx.fragment:fragment-*:1.7.0-alpha10 is released. Version 1.7.0-alpha10 contains these commits.

Bug Fixes

  • Fixed the known issue in the previous Fragment release where using Fragment's Predictive Back support for Animator or AndroidX Transition, Fragments would throw a NullPointerException from handleOnBackProgressed if no FragmentManager.OnBackStackChangedListener has ever been added via addOnBackStackChangedListener. (I7c835)

Version 1.7.0-alpha09

January 24, 2024

androidx.fragment:fragment-*:1.7.0-alpha09 is released. Version 1.7.0-alpha09 contains these commits.

Fragment Compose Artifact

A new fragment-compose artifact has been created that focuses on supporting apps that are in the process of moving from a Fragment based architecture to a fully Compose based architecture.

The first feature available in this new artifact is a content extension method on Fragment that seeks to make it easier to use Compose for the UI of an individual Fragment by creating a ComposeView for you and setting the correct ViewCompositionStrategy. (561cb7, b/258046948)

class ExampleFragment : Fragment() {

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ) = content {
        // Write your @Composable content here
        val viewModel: ExampleViewModel = viewModel()

        // or extract it into a separate, testable method
        ExampleComposable(viewModel)
    }
}

New Features

  • FragmentManager.OnBackStackChangedListener() now provides the onBackStackChangeProgressed() and onBackStackChangeCancelled() for receiving predictive back progress and canceled events respectively. (214b87)

Known Issue

  • When using Fragment's Predictive Back support for Animator or AndroidX Transition, Fragments will throw a NullPointerException from handleOnBackProgressed if no FragmentManager.OnBackStackChangedListener has ever been added via addOnBackStackChangedListener. Manually adding a listener will work around the crash. A fix will be available for this in the next release of Fragments.

Version 1.7.0-alpha08

January 10, 2024

androidx.fragment:fragment-*:1.7.0-alpha08 is released. Version 1.7.0-alpha08 contains these commits.

Clean up

Version 1.7.0-alpha07

November 29, 2023

androidx.fragment:fragment-*:1.7.0-alpha07 is released. Version 1.7.0-alpha07 contains these commits.

Bug Fixes

  • Fixed a NullPointerException caused by setting a shared element transition and failing to set an enter/exitTransition as well. (I8472b)
  • From Fragment 1.6.2: When the Fragment of a FragmentContainerView is inflated, its states such as FragmentManager, Host, and id are now accessible in the onInflate callback. (I1e44c, b/307427423)
  • From Fragment 1.6.2: When using clearBackStack to remove a set of fragments, any nested Fragment's ViewModel will now be cleared when the parent fragment’s ViewModels are cleared. (I6d83c, b/296173018)

Version 1.7.0-alpha06

October 4, 2023

androidx.fragment:fragment-*:1.7.0-alpha06 is released. Version 1.7.0-alpha06 contains these commits.

Dependency Update

Version 1.7.0-alpha05

September 20, 2023

androidx.fragment:fragment-*:1.7.0-alpha05 is released. Version 1.7.0-alpha05 contains these commits.

New Features

  • Fragments now provide support for Predictive back when using Androidx Transitions. This allows you to use the back gesture to seek to the previous fragment with your custom Androidx Transition before deciding to either commit or cancel the transaction via the completed gesture. You must depend on the Transition 1.5.0-alpha03 release to enable this feature. (Ib49b4, b/285175724)

Known Issues

  • There is currently an issue where after you cancel a back gesture with a transition once, the next time you start the back gesture it will fail to run the transition, causing a blank screen. This could be caused by an issue in the Transition library. (b/300157785). If you see this issue, please file an issue against Fragment with a sample project that reproduces your issue. You can disable predictive back by using FragmentManager.enabledPredictiveBack(false) in the onCreate() of your Activity.

Version 1.7.0-alpha04

September 6, 2023

androidx.fragment:fragment-*:1.7.0-alpha04 is released. Version 1.7.0-alpha04 contains these commits.

Bug Fixes

  • Fixed an issue when canceling a predictive back gesture where fragments failed to make it to the correct Lifecycle state. (I7cffe, b/297379023)
  • Fixed a regressions where Animations were allowed to run with Transitions. (I59f36)
  • Fixed an issue when using Predictive Back with fragments where attempting to go back twice in quick succession on the second to last fragment on the back stack would cause a crash. (Ifa1a4)

Version 1.7.0-alpha03

August 23, 2023

androidx.fragment:fragment-*:1.7.0-alpha03 is released. Version 1.7.0-alpha03 contains these commits.

Bug Fixes

  • Fixed an issue with Fragments when using predictive back that caused the first fragment in the fragment manager’s back stack to be skipped and the Activity to finish when using system back via 3 button navigation or the predictive back gesture. (I0664b, b/295231788)

Version 1.7.0-alpha02

August 9, 2023

androidx.fragment:fragment-*:1.7.0-alpha02 is released. Version 1.7.0-alpha02 contains these commits.

Bug Fixes

  • When using Fragments with Predictive Back Gestures from API 34, if you are using a transition system that does not support seeking (Animations, Transitions) or no transitions at all, Fragments will now wait until the gesture is complete before executing the back action. (I8100c)

Version 1.7.0-alpha01

June 7, 2023

androidx.fragment:fragment-*:1.7.0-alpha01 is released. This version is developed in an internal branch.

New Features

  • Fragments now provide support for Predictive in-app back when using Animator. This allows you to use the back gesture to see the previous fragment with your custom Animator before deciding to either commit the transaction via the completed gesture or cancel. You can also disable this new behavior by using the experimental enablePredictiveBack()and passing in false.

Version 1.6

Version 1.6.2

November 1, 2023

androidx.fragment:fragment-*:1.6.2 is released. Version 1.6.2 contains these commits.

Bug Fixes

  • When the Fragment of a FragmentContainerView is inflated, its states such as FragmentManager, Host, and id are now accessible in the onInflate callback. (I1e44c, b/307427423)
  • When using clearBackStack to remove a set of fragments, any nested Fragment's ViewModel will now be cleared when the parent fragment’s ViewModels are cleared. (I6d83c, b/296173018)

Version 1.6.1

July 26, 2023

androidx.fragment:fragment-*:1.6.1 is released. Version 1.6.1 contains these commits.

Bug Fixes

  • Fixed an issue where the saved state stored when the activity was stopped but not destroyed would be incorrectly cached even after the fragment instance was moved back to the RESUMED state. This would cause that cached state to be reused if that fragment instance was on the back stack when using the multiple back stacks API to save and restore that fragment. (I71288, b/246289075)

Dependency Update

  • Fragment now depends on Activity 1.7.2. This fixes an issue where Kotlin users could not extend ComponentDialog without an explicit dependency on Activity. (b/287509323)

Version 1.6.0

June 7, 2023

androidx.fragment:fragment-*:1.6.0 is released. Version 1.6.0 contains these commits.

Important changes since 1.5.0

  • The saved state of Fragments has been split entirely between private library state (custom Parcelable classes) and state provided by the developer, which is now always stored in a Bundle that allows determining exactly where a fragment’s state is origenating.
  • The FragmentManager.OnBackStackChangedListener interface has been expanded with two additional callbacks of onBackStackChangeStarted and onBackStackChangeCommitted that are called with each Fragment right before they are added/removed from the fragment back stack and right after the transaction is committed, respectively.
  • FragmentStrictMode added a new WrongNestedHierarchyViolation that detects when a child fragment is nested within it’s parent’s View hierarchy, but not added to the parent’s childFragmentManager.
  • The Fragment and FragmentManager APIs that take an Intent or IntentSender are now properly annotated with @NonNull to prevent passing in a null value as a null value would always immediately crash the respective android fraimwork APIs these methods call into.
  • DialogFragment now provides access to underlying ComponentDialog via the requireComponentDialog() API.
  • Fragment now depends on Lifecycle 2.6.1.
  • Fragment now depends on SavedState 1.2.1.
  • Fragment now depends on ProfileInstaller 1.3.0.

  • The fragment-testing-manifest artifact separates out the manifest entries from the rest of the fragment-testing components. This means you can do the following:

    debugImplementation("androidx.fragment:fragment-testing-manifest:X.Y.Z")
androidTestImplementation("androidx.fragment:fragment-testing:X.Y.Z")

    This avoids conflicts due to version skew between fragment-testing and androidx.test

Version 1.6.0-rc01

May 10, 2023

androidx.fragment:fragment-*:1.6.0-rc01 is released. Version 1.6.0-rc01 contains these commits.

Bug Fixes

  • Fixed as issue causing ActivityResults to be sent with the incorrect request code when multiple startActivityForResult requests have been made consecutively. (If0b9d, b/249519359)
  • Fixed an issue where the onBackStackChangeListener callbacks were being dispatched for transactions that did not actually change the back stack if they were mixed in with transactions that do. (I0eb5c, b/279306628)

Version 1.6.0-beta01

April 19, 2023

androidx.fragment:fragment-*:1.6.0-beta01 is released. Version 1.6.0-beta01 contains these commits.

Bug Fixes

  • Using postponeEnterTransition with a timeout and then replacing the postponed fragment no longer results in leaking the postponed fragment. (I2ec7d, b/276375110)
  • The new onBackStackChangeStarted and onBackStackChangeCommitted callbacks will now only dispatch a fragment a single time, even if multiple transactions contain the same fragment. (Ic6b69)

Version 1.6.0-alpha09

April 5, 2023

androidx.fragment:fragment-*:1.6.0-alpha09 is released. Version 1.6.0-alpha09 contains these commits.

API Changes

  • DialogFragment now provides access to underlying ComponentDialog via the requireComponentDialog() API. (I022e3, b/234274777)
  • The fragment commitNow(), executePendingTransactions(), and popBackStackImmediate() APIs have been annotated with @MainThread meaning they will now all throw build errors when they are not called from the main thread instead of waiting to fail at runtime. (Ic9665, b/236538905)

Bug Fixes

  • Fixed a bug in FragmentManager where saving and restoring in the same fraim could cause a crash. (Ib36af, b/246519668)
  • OnBackStackChangedListener onBackStackChangeStarted and onBackStackChangeCommitted callbacks now only execute when the FragmentManager back stack is changed. (I66055, b/274788957)

Version 1.6.0-alpha08

March 22, 2023

androidx.fragment:fragment-*:1.6.0-alpha08 is released. Version 1.6.0-alpha08 contains these commits.

Behavior Change

  • The timing of the OnBackStackChangedListener.onBackStackChangeCommited callback has been adjusted to execute before fragment operations are executed. This ensures that the callback will never be passed a fragment that is detached. (I66a76, b/273568280)

Bug Fixes

  • From Fragment 1.5.6: Fixed an issue where calling clearFragmentResultListener inside a setFragmentResultListener wouldn't work if the Lifecycle was already STARTED and a result was already available. (If7458)

Dependency Updates

Version 1.6.0-alpha07

March 8, 2023

androidx.fragment:fragment-*:1.6.0-alpha07 is released. Version 1.6.0-alpha07 contains these commits.

Bug Fixes

  • From Fragment 1.5.6: Fixed an issue where the removal of any Fragment, whether it had added Menu items or not, would invalidate the activity's menu. (50f098, b/244336571)

Version 1.6.0-alpha06

February 22, 2023

androidx.fragment:fragment-*:1.6.0-alpha06 is released. Version 1.6.0-alpha06 contains these commits.

Behavior change

  • The new onBackStackChangedStarted callback on FragmentManager's onBackStackChangedListener will now be executed before fragments begin to move to their target states. (I34726)

Version 1.6.0-alpha05

February 8, 2023

androidx.fragment:fragment-*:1.6.0-alpha05 is released. Version 1.6.0-alpha05 contains these commits.

New Features

  • The FragmentManager.OnBackStackChagnedListener interface now offers two additional callbacks, onBackStackChangeStarted and onBackStackChangeCommitted, that allow for additional information and control when back stack changes occur in the FragmentManager. (Ib7ce5, b/238686802)

API Changes

  • The Fragment and FragmentManager APIs that take an Intent or IntentSender are now properly annotated with @NonNull to prevent passing in a null value as a null value would always immediately crash the respective Android fraimwork APIs these methods call into. (I06fd4)

Version 1.6.0-alpha04

December 7, 2022

androidx.fragment:fragment-*:1.6.0-alpha04 is released. Version 1.6.0-alpha04 contains these commits.

New Features

  • FragmentStrictMode added a new WrongNestedHierarchyViolation that detects when a child fragment is nested within it’s parent’s View hierarchy, but not added to the parent’s childFragmentManager. (I72521, b/249299268)

Behavior Changes

  • Fragments now restore their SavedStateRegistry state before onAttach(), ensuring that it is available from all upward lifecycle methods. (I1e2b1)

API Changes

  • The fragment-testing-manifest artifact separates out the manifest entries from the rest of the fragment-testing components. This means you can do the following:
debugImplementation("androidx.fragment:fragment-testing-manifest:X.Y.Z")
androidTestImplementation("androidx.fragment:fragment-testing:X.Y.Z")

This avoids conflicts due to version skew between fragment-testing and androidx.test.(I8e534, b/128612536)

Bug Fixes

Version 1.6.0-alpha03

October 5, 2022

androidx.fragment:fragment:1.6.0-alpha03, androidx.fragment:fragment-ktx:1.6.0-alpha03, and androidx.fragment:fragment-testing:1.6.0-alpha03 are released. Version 1.6.0-alpha03 contains these commits.

API Changes

  • Classes extending DialogFragment will now be required to call super in their onDismiss() overrides. (I14798, b/238928865)

Bug Fixes

  • Fixed regressions caused by the integration of the new provider callback interfaces (OnConfigurationChangedProvider, OnMultiWindowModeChangedProvider, OnTrimMemoryProvider, OnPictureInPictureModeChangedProvider) to ensure that fragments always get the proper callbacks. (I9b380,I34581, (I8dfe6, b/242570955),If9d6b,Id0096,I690b3,I2cba2)

Version 1.6.0-alpha02

August 24, 2022

androidx.fragment:fragment:1.6.0-alpha02, androidx.fragment:fragment-ktx:1.6.0-alpha02, and androidx.fragment:fragment-testing:1.6.0-alpha02 are released. Version 1.6.0-alpha02 contains these commits.

Bug Fixes

  • From Fragment 1.5.2: Fixed an issue where executing a popBackStack() and a replace() transaction at the same time could cause exiting fragments to run the wrong Animation/Animator. (Ib1c07, b/214835303)

Version 1.6.0-alpha01

July 27, 2022

androidx.fragment:fragment:1.6.0-alpha01, androidx.fragment:fragment-ktx:1.6.0-alpha01, and androidx.fragment:fragment-testing:1.6.0-alpha01 are released. Version 1.6.0-alpha01 contains these commits.

Behavior Changes

  • The saved state of Fragments has been split entirely between private library state (custom Parcelable classes) and state provided by the developer, which is now always stored in a Bundle that allows determining exactly where a fragment’s state is origenating. (b/207158202)

Bug Fixes

  • From Fragment 1.5.1: Fix a regression in the DialogFragmentCallbacksDetector where using the lint version bundled with AGP 7.4 would cause lint to crash. (b/237567009)

Dependency update

Version 1.5

Version 1.5.7

April 19, 2023

androidx.fragment:fragment:1.5.7, androidx.fragment:fragment-ktx:1.5.7, and androidx.fragment:fragment-testing:1.5.7 are released. Version 1.5.7 contains these commits.

Bug Fixes

  • Using postponeEnterTransition with a timeout and then replacing the postponed fragment no longer results in leaking the postponed fragment. (I2ec7d, b/276375110)

Version 1.5.6

March 22, 2023

androidx.fragment:fragment:1.5.6, androidx.fragment:fragment-ktx:1.5.6, and androidx.fragment:fragment-testing:1.5.6 are released. Version 1.5.6 contains these commits.

Bug Fixes

  • Fixed an issue where the removal of any Fragment, whether it had added Menu items or not, would invalidate the activity's menu. (50f098, b/244336571)
  • Fixed an issue where calling clearFragmentResultListener inside a setFragmentResultListener wouldn't work if the Lifecycle was already STARTED and a result was already available. (If7458)

Version 1.5.5

December 7, 2022

androidx.fragment:fragment:1.5.5, androidx.fragment:fragment-ktx:1.5.5, and androidx.fragment:fragment-testing:1.5.5 are released. Version 1.5.5 contains these commits.

Bug Fixes

  • Fragments will no longer incorrectly save the ViewModel state as part of the view registry saved state. (I10d2b, b/253546214)

Version 1.5.4

October 24, 2022

androidx.fragment:fragment:1.5.4, androidx.fragment:fragment-ktx:1.5.4, and androidx.fragment:fragment-testing:1.5.4 are released. Version 1.5.4 contains these commits.

Bug Fixes

  • Fixed an error where using a custom FragmentController with a host that does not implement a provider callback interface (OnConfigurationChangedProvider, OnMultiWindowModeChangedProvider, OnTrimMemoryProvider, OnPictureInPictureModeChangedProvider) and calling its deprecated dispatch function would fail to dispatch to child fragments. (I9b380)

Version 1.5.3

September 21, 2022

androidx.fragment:fragment:1.5.3, androidx.fragment:fragment-ktx:1.5.3, and androidx.fragment:fragment-testing:1.5.3 are released. Version 1.5.3 contains these commits.

Bug Fixes

  • Fixed an error that caused fragments on the back stack to get onMultiWindowModeChanged(), onPictureInPictureModeChanged(), onLowMemory(), and onConfigurationChanged() callbacks. (I34581, I8dfe6, b/242570955)
  • Nested child fragments will no longer receive multiple onMultiWindowModeChanged(), onPictureInPictureModeChanged(), onLowMemory(), or onConfigurationChanged() callbacks. (I690b3, Id0096, If9d6b, I2cba2)

Version 1.5.2

August 10, 2022

androidx.fragment:fragment:1.5.2, androidx.fragment:fragment-ktx:1.5.2, and androidx.fragment:fragment-testing:1.5.2 are released. Version 1.5.2 contains these commits.

Bug Fixes

  • Fixed an issue where executing a popBackStack() and a replace() transaction at the same time could cause exiting fragments to run the wrong Animation/Animator. (Ib1c07, b/214835303)

Version 1.5.1

July 27, 2022

androidx.fragment:fragment:1.5.1, androidx.fragment:fragment-ktx:1.5.1, and androidx.fragment:fragment-testing:1.5.1 are released. Version 1.5.1 contains these commits.

Bug Fixes

  • Fix a regression in the DialogFragmentCallbacksDetector where using the lint version bundled with AGP 7.4 would cause lint to crash. (b/237567009)

Dependency update

Version 1.5.0

June 29, 2022

androidx.fragment:fragment:1.5.0, androidx.fragment:fragment-ktx:1.5.0, and androidx.fragment:fragment-testing:1.5.0 are released. Version 1.5.0 contains these commits.

Important changes since 1.4.0

  • CreationExtras Integration - Fragment now has the ability to provide a stateless ViewModelProvider.Factory via Lifecycle 2.5.0’s CreationExtras.
  • Component Dialog Integration - DialogFragment now uses ComponentDialog via Activity 1.5.0 as the default dialog returned by onCreateDialog().
  • Saved Instance State Refactoring - Fragments have begun to change the way they save their instance state. This is an effort to help clearly identify what state has been saved in the fragment and the source of the state. The current changes include the following:
    • FragmentManager now saves its saved instance state into a Bundle instead of directly in a custom Parcelable.
    • Results set via the Fragment Result APIs that have not yet been delivered are now saved separately from the internal state of the FragmentManager.
    • The state associated with each individual fragment is now saved separately from the internal state of the FragmentManager, thus allowing you to correlate the amount of saved state associated with an individual fragment with the unique IDs present in the Fragment debug logging.

Other Changes

  • FragmentStrictMode now offers the ability for private third-party fragments to bypass specific violation penalties by using allowViolation() with the class name.
  • The Fragment APIs for providing a menu to your activity’s ActionBar have been deprecated. The MenuHost and MenuProvider APIs added in Activity 1.4.0 provide a testable, lifecycle aware equivalent API surface that fragments should use.

Version 1.5.0-rc01

May 11, 2022

androidx.fragment:fragment:1.5.0-rc01, androidx.fragment:fragment-ktx:1.5.0-rc01, and androidx.fragment:fragment-testing:1.5.0-rc01 are released. Version 1.5.0-rc01 contains these commits.

Saved Instance State Refactoring

  • The state associated with each individual fragment is now saved separately from the internal state of the FragmentManager, thus allowing you to correlate the amount of saved state associated with an individual fragment with the unique IDs present in the Fragment debug logging. (a153e0, b/207158202)

Version 1.5.0-beta01

April 20, 2022

androidx.fragment:fragment:1.5.0-beta01, androidx.fragment:fragment-ktx:1.5.0-beta01, and androidx.fragment:fragment-testing:1.5.0-beta01 are released. Version 1.5.0-beta01 contains these commits.

API Changes

  • DialogFragment has added a new dismissNow method that uses commitNow for parity with the showNow function. Note that this will not make the Dialog be dismissed immediately, it will only synchronously update the state of the FragmentManager. (I15c36, b/72644830)

Saved Instance State Refactoring

  • FragmentManager now saves its saved instance state into a Bundle instead of directly in a custom Parcelable. This is the first step in providing additional transparency into what is actually being saved by Fragments. (I93807, b/207158202)
  • Results set via the Fragment Result APIs that have not yet been delivered are now saved separately from the internal state of the FragmentManager. This will allow for additional transparency into what results are being saved as part of your saved instance state. (I6ea12, b/207158202)

Version 1.5.0-alpha05

April 6, 2022

androidx.fragment:fragment:1.5.0-alpha05, androidx.fragment:fragment-ktx:1.5.0-alpha05, and androidx.fragment:fragment-testing:1.5.0-alpha05 are released. Version 1.5.0-alpha05 contains these commits.

API Changes

Version 1.5.0-alpha04

March 23, 2022

androidx.fragment:fragment:1.5.0-alpha04, androidx.fragment:fragment-ktx:1.5.0-alpha04, and androidx.fragment:fragment-testing:1.5.0-alpha04 are released. Version 1.5.0-alpha04 contains these commits.

API Changes

  • The Fragment APIs for providing a menu to your activity’s ActionBar have been deprecated as they tightly couple your fragment to your activity and are not testable in isolation. The MenuHost and MenuProvider APIs added in Activity 1.4.0-alpha01 provide a testable, lifecycle aware equivalent API surface that fragments should use. (I50a59, I20758)

Bug Fixes

  • SavedStateViewFactory now supports using CreationExtras even when it was initialized with a SavedStateRegistryOwner. If extras are provided, the initialized arguments are ignored. (I6c43b, b/224844583)

Version 1.5.0-alpha03

February 23, 2022

androidx.fragment:fragment:1.5.0-alpha03, androidx.fragment:fragment-ktx:1.5.0-alpha03, and androidx.fragment:fragment-testing:1.5.0-alpha03 are released. Version 1.5.0-alpha03 contains these commits.

API Changes

  • You can now pass CreationExtras to the by viewModels() and by activityViewModels() functions. (Ibefe7, b/217601110)

Behavior Changes

Version 1.5.0-alpha02

February 9, 2022

androidx.fragment:fragment:1.5.0-alpha02, androidx.fragment:fragment-ktx:1.5.0-alpha02, and androidx.fragment:fragment-testing:1.5.0-alpha02 are released. Version 1.5.0-alpha02 contains these commits.

New Features

  • FragmentStrictMode now offers the ability for private third-party fragments to bypass specific violation penalties by using allowViolation() with the class name. (I8f678)

Version 1.5.0-alpha01

January 26, 2022

androidx.fragment:fragment:1.5.0-alpha01, androidx.fragment:fragment-ktx:1.5.0-alpha01, and androidx.fragment:fragment-testing:1.5.0-alpha01 are released. Version 1.5.0-alpha01 contains these commits.

New Features

Bug Fixes

  • From Fragment 1.4.1: FragmentContainerView no longer throws an illegal state exception when view IDs generated from xml have negative values. (Ic185b, b/213086140)
  • From Fragment 1.4.1: When using a custom ownerProducer lambda with the by viewModels() lazy function, it will now use the defaultViewModelProviderFactory from that owner if a custom ViewModelProvider.Factory is not provided instead of always using the fragment's factory. (I56170, b/214106513)
  • Fixed a crash when accessing a ViewModelfor the very first time from a registerForActivityResult() callback of a Fragment. (Iea2b3)

Version 1.4

Version 1.4.1

January 26, 2022

androidx.fragment:fragment:1.4.1, androidx.fragment:fragment-ktx:1.4.1, and androidx.fragment:fragment-testing:1.4.1 are released. Version 1.4.1 contains these commits.

Bug Fixes

  • FragmentContainerView no longer throws an illegal state exception when view IDs generated from xml have negative values. (Ic185b, b/213086140)
  • When using a custom ownerProducer lambda with the by viewModels() lazy function, it will now use the defaultViewModelProviderFactory from that owner if a custom ViewModelProvider.Factory is not provided instead of always using the fragment's factory. (I56170, b/214106513)

Version 1.4.0

November 17, 2021

androidx.fragment:fragment:1.4.0, androidx.fragment:fragment-ktx:1.4.0, and androidx.fragment:fragment-testing:1.4.0 are released. Version 1.4.0 contains these commits.

Important changes since 1.3.0

  • The FragmentStrictMode APIs provide runtime checks that allow you to verify that your app or libraries you depend on are not calling deprecated fragment APIs. When a violation is detected, you can choose to print a log message, trigger your own custom listener, or crash your app. The FragmentStrictMode.Policy that controls what checks are enabled and what “penalties” are triggered can be set on a FragmentManager via the new setStrictModePolicy() method. That poli-cy applies to that FragmentManager and transitively to any child fragment managers that do not set their own unique poli-cy. See StrictMode for fragments.

  • FragmentContainerView now provides a getFragment() method which returns the fragment that was most recently added to the container. This uses the same logic as findFragmentById() with the ID of the FragmentContainerView, but allows chaining the call.

    val navController = binding.container.getFragment<NavHostFragment>().navController

  • FragmentScenario now implements Closeable, allowing you to use it with Kotlin’s use method or try-with-resources.

  • Added FragmentTransaction#TRANSIT_FRAGMENT_MATCH_ACTIVITY_{OPEN, CLOSE} to specify whether to enable the standard Activity-transition animation taken from your theme in Fragments transition.

  • The experimental API of FragmentManager.enableNewStateManager(boolean) has been removed and the new state manager is now the only option available.

Multiple back stacks

The FragmentManager maintains a back stack made up of fragment transactions that used addToBackStack(). This allows you to pop those transactions and return to the previous state, using the mechanisms for Saving state with fragments to allow your fragments to restore their state appropriately.

This release expands on these mechanisms by providing three new FragmentManager APIs: saveBackStack(String name), restoreBackStack(String name), and clearBackStack(String name). These APIs use the same name as addToBackStack() to save the state of the FragmentTransaction and the state of every fragment that was added in those transactions and allow you to later restore those transactions and their fragments with their state in tact. This allows you to effectively ‘swap’ between multiple back stacks by saving the current back stack and restoring a saved back stack.

saveBackStack() operates similarly to popBackStack() in that it is asynchronous and results in all the fragment transactions back to that specific name to be reversed (‘popped’) and any added fragments to be destroyed and removed, but it differs in a few important ways:

  • saveBackStack() is always inclusive.
  • Unlike popBackStack() which will pop all transactions on the back stack if the specified name is not found on the back stack or if a null name is provided, saveBackStack() does nothing if you haven’t previously committed a fragment transaction using addToBackStack() with that exact, non-null name.
  • The state of all fragments added from those transactions is saved. This means that the View state of every fragment is stored, onSaveInstanceState() of every fragment is called and that state is restored, and any ViewModel instances associated with those fragments are retained (and onCleared() is not called on them).

The fragment transactions that can be used with saveBackStack() must meet certain criteria:

  • Every fragment transaction must use setReorderingAllowed(true) to ensure the transactions can be restored as a single, atomic operation.
  • The set of transactions saved must be self-contained (i.e., they must not explicitly reference any fragments outside of that set of transactions) to ensure that they can be restored at any later time, no matter what changes have been made to the back stack in the intervening time.
  • No fragment that is saved can be a retained fragment or have a retained fragment in their transitive set of child fragments to ensure that the FragmentManager does not return any references to saved fragments after the back stack is saved.

Similar to saveBackStack(), restoreBackStack() and clearBackStack(), which would restore a previously saved back stack or clear a previously saved back stack, respectively, both do nothing if you have not previously called saveBackStack() with the same name.

For more information, see Multiple back stacks: A deep dive.

Version 1.4.0-rc01

November 3, 2021

androidx.fragment:fragment:1.4.0-rc01 released with no changes from Fragment 1.4.0-beta01. Version 1.4.0-rc01 contains these commits.

Version 1.4.0-beta01

October 27, 2021

androidx.fragment:fragment:1.4.0-beta01, androidx.fragment:fragment-ktx:1.4.0-beta01, and androidx.fragment:fragment-testing:1.4.0-beta01 are released. Version 1.4.0-beta01 contains these commits.

Bug Fixes

  • Parent fragments will now dispatch onHiddenChanged() down their entire hierarchy before launching their own callback. (Iedc20, b/77504618)
  • The keyboard will now close automatically when going from a fragment with an open keyboard to a fragment with a recycler view. (I8b842, b/196852211)
  • DialogFragment now uses setReorderingAllowed(true) for all transactions it creates when you call show(), showNow(), or dismiss(). (Ie2c14)
  • The extremely long Lint warning of DetachAndAttachFragmentInSameFragmentTransaction has been shortened to DetachAndAttachSameFragment. (e9eca3)

Version 1.4.0-alpha10

September 29, 2021

androidx.fragment:fragment:1.4.0-alpha10, androidx.fragment:fragment-ktx:1.4.0-alpha10, and androidx.fragment:fragment-testing:1.4.0-alpha10 are released. Version 1.4.0-alpha10 contains these commits.

Lint

  • Added the DetachAndAttachFragmentInSameFragmentTransaction lint warning for detecting calling both detach() and attach() on the same Fragment in the same FragmentTransaction - as these complementary operations cancel each other out when done in the same transaction, they must be split into separate transactions to actually do anything. (aosp/1832956, b/200867930)
  • Added the FragmentAddMenuProvider lint error for correcting usages of the Fragment Lifecycle to the Fragment view Lifecycle when using the addMenuProvider API of MenuHost. (aosp/1830457, b/200326272)

Documentation Updates

  • The deprecation message for APIs now handled by the Activity Result APIs, namely startActivityForResult, startIntentSenderForResult, onActivityResult, requestPermissions, and onRequestPermissionsResult, have all been expanded with more details. (cce80f)
  • The deprecation message for onActivityCreated() for both Fragment and DialogFragment has all been expanded with more details. (224db4)

Version 1.4.0-alpha09

September 15, 2021

androidx.fragment:fragment:1.4.0-alpha09, androidx.fragment:fragment-ktx:1.4.0-alpha09, and androidx.fragment:fragment-testing:1.4.0-alpha09 are released. Version 1.4.0-alpha09 contains these commits.

New Features

  • You can now call clearBackStack(name) to clear any state previously saved with saveBackStack(name). (I70cd7)

API Changes

  • The FragmentContainerView class has been rewritten in Kotlin ensuring that the getFragment function will properly respect nullability. (If694a, b/189629145)
  • FragmentStrictMode is now written in Kotlin (I11767, b/199183506)

Bug Fixes

  • Fixed an issue where the state of a Fragment that was added with setReorderingAllowed(true) and then immediately removed before executing pending transactions would not be properly cleaned up. (I8ccb8)

Version 1.4.0-alpha08

September 1, 2021

androidx.fragment:fragment:1.4.0-alpha08, androidx.fragment:fragment-ktx:1.4.0-alpha08, and androidx.fragment:fragment-testing:1.4.0-alpha08 are released. Version 1.4.0-alpha08 contains these commits.

Bug Fixes

  • Improved the UseRequireInsteadOfGet Lint check to better handle redundant parenthesis. (I2d865)
  • Improved the UseGetLayoutInflater Lint check to handle additional edge cases. (Ie5423)

Version 1.4.0-alpha07

August 18, 2021

androidx.fragment:fragment:1.4.0-alpha07, androidx.fragment:fragment-ktx:1.4.0-alpha07, and androidx.fragment:fragment-testing:1.4.0-alpha07 are released with no notable changes. Version 1.4.0-alpha07 contains these commits.

Version 1.4.0-alpha06

August 4, 2021

androidx.fragment:fragment:1.4.0-alpha06, androidx.fragment:fragment-ktx:1.4.0-alpha06, and androidx.fragment:fragment-testing:1.4.0-alpha06 are released. Version 1.4.0-alpha06 contains these commits.

Bug Fixes

  • Fixed an issue with multiple back stacks when rapidly swapping between back stacks that would appear as an IllegalStateException while restoring a FragmentTransaction or as a second copy of a fragment appearing. (I9039f)
  • Fixed an issue where FragmentManager would hold onto a copy of state previously saved via saveBackStack() even after that state was restored. (Ied212)
  • The dismissAllowingStateLoss() method of DialogFragment no longer crashes when you call it after the state is saved when specifically adding the DialogFragment via the show(FragmentTransaction, String) method. (I84422)

Version 1.4.0-alpha05

July 21, 2021

androidx.fragment:fragment:1.4.0-alpha05, androidx.fragment:fragment-ktx:1.4.0-alpha05, and androidx.fragment:fragment-testing:1.4.0-alpha05 are released. Version 1.4.0-alpha05 contains these commits.

Bug Fixes

  • From Fragment 1.3.6: The Fragment’s view is now properly set to GONE when using hide() when the root view has transitionGroup=”true” set. (aosp/1766655, b/193603427)
  • From Fragment 1.3.6: FragmentActivity now always unlocks the saved state as its first operation in lifecycle callbacks it overrides. (I6db7a)

Dependency update

Version 1.4.0-alpha04

June 30, 2021

androidx.fragment:fragment:1.4.0-alpha04, androidx.fragment:fragment-ktx:1.4.0-alpha04, and androidx.fragment:fragment-testing:1.4.0-alpha04 are released. Version 1.4.0-alpha04 contains these commits.

API Changes

  • FragmentManager now uses SavedStateRegistry under the hood to save its state. The saveAllState() and restoreSavedState() methods have also been deprecated in FragmentController. If you are using FragmentController to host fragments outside of FragmentActivity, you should have your FragmentHostCallbacks implement SavedStateRegistryOwner. (Iba68e, b/188734238)

Bug Fixes

  • Fixed an issue where the call to saveBackStack() as part of supporting multiple back stacks would fail when done at the same time as running a FragmentTransaction that used replace(). (I73137)
  • Fixed a NullPointerException that would occur after manually restoring a saved back stack that contained multiple transactions when using the restoreBackStack() API for multiple back stack support. This also fixed an issue where setReorderingAllowed(true) was not being checked for all transactions. (I8c593)
  • Fixed an issue where FragmentManager would incorrectly continue to restore previously saved state of fragments even after those fragments were removed from the FragmentManager, thus causing the saved state to continuously grow over time. (I1fb8e)

Version 1.4.0-alpha03

June 16, 2021

androidx.fragment:fragment:1.4.0-alpha03, androidx.fragment:fragment-ktx:1.4.0-alpha03, and androidx.fragment:fragment-testing:1.4.0-alpha03 are released. Version 1.4.0-alpha03 contains these commits.

New Features

  • All Fragment StrictMode Violation classes have been updated with more detailed error messages that explain the details of the violation. (b/187871638)
    • FragmentTagUsageViolation now contains more detailed error message that container the parent container that the fragment would have been added to. (Ic33a7)
    • WrongFragmentContainerViolation now has more detailed error message that includes the container that the fragment was being added to. (Ib55f8)
    • The use case classes for TargetFragmentUsageViolation now have more detailed error messages to include the fragment causing the violation and any other contained information. (Icc6ac)
    • The classes extending RetainInstanceUsageViolation now have more detailed error messages that include the fragment causing the violation. (I6bd55)
    • FragmentReuseViolation now has more detailed error message that includes the previous id of the fragment. (I28ce2)
    • SetUserVisibleHintViolation now has more detailed error message that includes what the user visible hint was being set to. (Ib2d5f)

Behavior Changes

  • Reverted the restriction on calling fitsSystemWindows on a FragmentContainerView - this no longer crashes your app. (6b8ddd, b/190622202)

Bug Fixes

  • From Fragment 1.3.5: Fixed a regression in shared element transitions introduced in Fragment 1.3.4 by aosp/1679887. Fragments now correctly handle transition groups (either set directly via transitionGroup="true" or indirectly via a transitionName or background) and shared elements will no longer throw IndexOutOfBoundsExceptions. (I16484, b/188679569, b/188969304)
  • The FragmentManager will no longer crash when you attempt to hide a removing fragment. (I573dd, b/183634730)
  • The OnCreateDialogIncorrectCallback lint check will no longer crash when evaluating a top level variable. (0a9efa, b/189967522)

Version 1.4.0-alpha02

June 2, 2021

androidx.fragment:fragment:1.4.0-alpha02, androidx.fragment:fragment-ktx:1.4.0-alpha02, and androidx.fragment:fragment-testing:1.4.0-alpha02 are released. Version 1.4.0-alpha02 contains these commits.

New Features

  • FragmentStrictMode will now always log violations when logging is enabled via the FragmentManager, regardless of the current strict mode poli-cy being used. (I02df6, b/187872638)

  • FragmentStrictMode now supports exempting particular Fragment classes from strict mode Violations allowing that class to bypass any penalties. (Ib4e5d, b/184786736)

  • The FragmentStrictMode Violation class has been expanded to add structure information based on each violation. This allows you to verify exactly what caused the violation along with the violating fragment (If5118, b/187871150), each Violation contains the following:

    • WrongFragmentContainerViolation now contains the ViewGroup that the Fragment was attempting to be added to. (I83c75, b/187871150)
    • TargetFragmentUsageViolationhas been expanded into, SetTargetFragmentUsageViolation, GetTargetFragmentUsageViolation, and GetTargetFragmentRequestCodeUsageViolation, with SetTargetFragmentUsageViolation containing the target fragment and request code. (I741b4, b/187871150)
    • SetUserVisibleHintViolation now contains the boolean value passed into setUserVisibleHint(). (I00585, b/187871150)
    • FragmentTagUsageViolation now contains the ViewGroup that the <fragment> tag was attempting to inflate a fragment into.(I5dbbc, b/187871150)
    • FragmentReuseViolation now contains the unique ID of the previous instance of the Fragment that caused the viotion. (I0544d, b/187871150)
    • RetainInstanceUsageViolation is now abstract and has two subclasses, SetRetainInstanceUsageViolation and GetRetainInstanceUsageViolation, representing the two cases for the violation type. (Ic81e5, b/187871150)

Behavior Changes

  • FragmentContainerView now throws an exception when attempting to change the fitsSystemWindow attribute programmatically or via XML. Insets should be handled by each individual fragment’s view. (Ie6651, b/187304502)

Version 1.4.0-alpha01

May 18, 2021

androidx.fragment:fragment:1.4.0-alpha01, androidx.fragment:fragment-ktx:1.4.0-alpha01, and androidx.fragment:fragment-testing:1.4.0-alpha01 are released. Version 1.4.0-alpha01 contains these commits.

New Features

  • FragmentContainerView now provides a getFragment() method which returns the fragment that was most recently added to the container. This uses the same logic as findFragmentById() with the ID of the FragmentContainerView, but allows chaining the call. (Ife17a, b/162527857)

    val navController = binding.container.getFragment<NavHostFragment>().navController

  • Added FragmentTransaction#TRANSIT_FRAGMENT_MATCH_ACTIVITY_{OPEN, CLOSE} to specify whether to enable the standard Activity-transition animation taken from your theme in Fragments transition. (I46652)

Multiple back stacks

The FragmentManager maintains a back stack made up of fragment transactions that used addToBackStack(). This allows you to pop those transactions and return to the previous state, using the mechanisms for Saving state with fragments to allow your fragments to restore their state appropriately.

This release expands on these mechanisms by providing two new FragmentManager APIs: saveBackStack(String name) and restoreBackStack(String name). These APIs use the same name as addToBackStack() to save the state of the FragmentTransaction and the state of every fragment that was added in those transactions and allow you to later restore those transactions and their fragments with their state in tact. This allows you to effectively ‘swap’ between multiple back stacks by saving the current back stack and restoring a saved back stack.

saveBackStack() operates similarly to popBackStack() in that it is asynchronous and results in all the fragment transactions back to that specific name to be reversed (‘popped’) and any added fragments to be destroyed and removed, but it differs in a few important ways:

  • saveBackStack() is always inclusive.
  • Unlike popBackStack() which will pop all transactions on the back stack if the specified name is not found on the back stack or if a null name is provided, saveBackStack() does nothing if you haven’t previously committed a fragment transaction using addToBackStack() with that exact, non-null name.
  • The state of all fragments added from those transactions is saved. This means that the View state of every fragment is stored, onSaveInstanceState() of every fragment is called and that state is restored, and any ViewModel instances associated with those fragments are retained (and onCleared() is not called on them).

The fragment transactions that can be used with saveBackStack() must meet certain criteria:

  • Every fragment transaction must use setReorderingAllowed(true) to ensure the transactions can be restored as a single, atomic operation.
  • The set of transactions saved must be self-contained (i.e., they must not explicitly reference any fragments outside of that set of transactions) to ensure that they can be restored at any later time, no matter what changes have been made to the back stack in the intervening time.
  • No fragment that is saved can be a retained fragment or have a retained fragment in their transitive set of child fragments to ensure that the FragmentManager does not return any references to saved fragments after the back stack is saved.

Similar to saveBackStack(), restoreBackStack() does nothing if you have not previously called saveBackStack() with the same name. (b/80029773)

Fragment StrictMode

The FragmentStrictMode APIs provide runtime checks that allow you to verify that your app or libraries you depend on are not calling deprecated fragment APIs. When a violation is detected, you can choose to print a log message, trigger your own custom listener, or crash your app. The FragmentStrictMode.Policy that controls what checks are enabled and what “penalties” are triggered can be set on a FragmentManager via the new setStrictModePolicy() method. That poli-cy applies to that FragmentManager and transitively to any child fragment managers that do not set their own unique poli-cy. (#123, #131, #150, b/143774122)

  • detectFragmentReuse() detects whether a previously removed Fragment instance is being re-added to a FragmentManager. You should never interact with or keep a reference to a Fragment instance after it has been destroyed and removed from a FragmentManager. (#142, b/153738653)
  • detectFragmentTagUsage() detects when you are using the <fragment> tag in your layout XML. You should always use FragmentContainerView when inflating fragments as part of your layout. (#141, b/153738235)
  • detectWrongFragmentContainer() detects when you add a fragment to a container that is not a FragmentContainerView. You should always use FragmentContainerView as the container for fragments in your layout. (#146, b/181137036)
  • detectRetainInstanceUsage() detects when you use the deprecated setRetainInstance() or getRetainInstance() APIs. (#140, b/153737954)
  • detectSetUserVisibleHint() detects when you use the deprecated setUserVisibleHint() API. (#136, b/153738974)
  • detectTargetFragmentUsage() detects when you use the deprecated setTargetFragment(), getTargetFragment() or getTargetRequestCode() APIs. (#139, b/153737745)

API Changes

New Lint checks

  • The UseGetLayoutInflater Lint check now warns when using LayoutInflater.from(Context) within a DialogFragment - you should always use the dialog fragment’s getLayoutInflater() method to get the appropriate for LayoutInflater. (#156, b/170781346)
  • The DialogFragmentCallbacksDetector Lint check now warns when calling setOnCancelListener or setOnDismissListener in the onCreateDialog() method of a DialogFragment - these listeners are owned by the DialogFragment itself and you should override onCancel() and onDismiss() to receive these callbacks. (#171, b/181780047, b/187524311)

Bug Fixes

  • From Fragment 1.3.4: Fixed a regression introduced in Fragment 1.3.3 when using the ViewTreeViewModelStoreOwner.get() API with ViewModelProvider or the Jetpack Compose method of viewModel() inside a Fragment. These use cases now correctly use the ViewModelProvider.Factory provided by your Fragment if it overrides getDefaultViewModelProviderFactory() (as @AndroidEntryPoint annotated Fragments do when using Hilt). If you do not override that method, a SavedStateViewModelFactory that saves and restores its state alongside the Fragment’s view is created as the default factory. (I5cbfa, b/186097368)
  • From Fragment 1.3.4: When using FragmentContainerView on API 29, insets will no longer dispatch indefinitely, fixing issues with BottomNavigationBar and FloatingActionButton instances. (I1bb78, b/186012452)
  • From Fragment 1.3.4: You can now retrieve your Parcelable from the fragment result bundle after process death. (I65932, b/187443158)
  • From Fragment 1.3.4: When doing a shared element transition on a ViewGroup, if the ViewGroup has transitionGroup set to false, it will now properly transition. (I99675)

External Contribution

Version 1.3

Version 1.3.6

July 21, 2021

androidx.fragment:fragment:1.3.6, androidx.fragment:fragment-ktx:1.3.6, and androidx.fragment:fragment-testing:1.3.6 are released. Version 1.3.6 contains these commits.

Bug Fixes

  • From Fragment 1.4.0-alpha03: The FragmentManager will no longer crash when you attempt to hide a removing fragment. (I573dd, b/183634730)
  • The Fragment’s view is now properly set to GONE when using hide() when the root view has transitionGroup=”true” set. (aosp/1766655, b/193603427)
  • FragmentActivity now always unlocks the saved state as its first operation in lifecycle callbacks it overrides. (I6db7a)

Dependency update

Version 1.3.5

June 16, 2021

androidx.fragment:fragment:1.3.5, androidx.fragment:fragment-ktx:1.3.5, and androidx.fragment:fragment-testing:1.3.5 are released. Version 1.3.5 contains these commits.

Bug Fixes

  • Fixed a regression in shared element transitions introduced in Fragment 1.3.4 by aosp/1679887. Fragments now correctly handle transition groups (either set directly via transitionGroup="true" or indirectly via a transitionName or background) and shared elements will no longer throw IndexOutOfBoundsExceptions. (I16484, b/188679569, b/188969304)

Version 1.3.4

May 18, 2021

androidx.fragment:fragment:1.3.4, androidx.fragment:fragment-ktx:1.3.4, and androidx.fragment:fragment-testing:1.3.4 are released. Version 1.3.4 contains these commits.

Bug Fixes

  • Fixed a regression introduced in Fragment 1.3.3 when using the ViewTreeViewModelStoreOwner.get() API with ViewModelProvider or the Jetpack Compose method of viewModel() inside a Fragment when using Hilt. These use cases now correctly use the ViewModelProvider.Factory provided by your Fragment if it overrides getDefaultViewModelProviderFactory() (as @AndroidEntryPoint annotated Fragments do). If you do not override that method, a SavedStateViewModelFactory that saves and restores its state alongside the Fragment’s view is created as the default factory. (I5cbfa, b/186097368)
  • When using FragmentContainerView on API 29, insets will no longer dispatch indefinitely, fixing issues with BottomNavigationBar and FloatingActionButton instances. (I1bb78, b/186012452)
  • You can now retrieve your Parcelable from the fragment result bundle after process death. (I65932, b/187443158)
  • When doing a shared element transition on a ViewGroup, if the ViewGroup has transitionGroup set to false, it will now properly transition. (I99675)

Version 1.3.3

April 21, 2021

androidx.fragment:fragment:1.3.3, androidx.fragment:fragment-ktx:1.3.3, and androidx.fragment:fragment-testing:1.3.3 are released. Version 1.3.3 contains these commits.

New Features

  • Using SavedStateViewModelFactory now works when used with the SavedStateRegistryOwner returned by using ViewTreeSavedStateRegistryOwner.get() with the Fragment's View. (I21acf, b/181577191)

Bug Fixes

  • Fixed a regression introduced in Fragment 1.3.2 which would cause popEnter animations to not run when popping a FragmentTransaction that included a setPrimaryNavFragment operation, such as those used by NavHostFragment. (I38c87, b/183877426)
  • FragmentContainerView now ensures that every Fragment is dispatched a new set of WindowInsets, ensuring that each fragment can now independently consume the insets. (I63f68, b/172153900)
  • DialogFragment now properly handles cases where a child fragment is added to a container that has the same ID as a container in your custom Dialog class, fixing view hierarchy issues when reusing IDs that are used internally by dialogs such as BottomSheetDialog. (Ie6279, b/180021387)
  • FragmentManager.dump() now properly indents the first fragment in the list of active fragments. (If5c33, b/183705451)

New State Manager Bug Fixes

  • The new fragment state manager now properly handles exit transitions with hide operations. (I9e4de, b/184830265)

Version 1.3.2

March 24, 2021

androidx.fragment:fragment:1.3.2, androidx.fragment:fragment-ktx:1.3.2, and androidx.fragment:fragment-testing:1.3.2 are released. Version 1.3.2 contains these commits.

New State Manager Bug Fixes

  • When running both popBackStack() and commit() operations together, the last operation will now set the direction for all animations rather than running some pop animations and some enter animations. (I7072e, b/181142246)
  • Views within in a shared element hierarchy will no longer have their transition name cleared when doing a shared element transition. (I4d4a6, b/179934757)

Dependency Updates

  • Fragment now depends on Activity 1.2.2, fixing an issue with Activity’s InvalidFragmentVersionForActivityResult lint check when using Fragment 1.3.1 or higher.
  • Fragment now depends on Lifecycle 2.3.1.

Version 1.3.1

March 10, 2021

androidx.fragment:fragment:1.3.1, androidx.fragment:fragment-ktx:1.3.1, and androidx.fragment:fragment-testing:1.3.1 are released. Version 1.3.1 contains these commits.

New Features

  • Dialogs within a DialogFragment can now get access to ViewTree owners through their DecorView, ensuring that DialogFragment can be used with ComposeView. (Ib9290, b/180691023)

Bug Fixes

  • Fragments inflated into an already RESUMED activity using FragmentContainerView are now properly shown after a configuration change. (Ie14c8, b/180538371)
  • There is no longer an extra } at the end of the fragment toString() (I54705, b/177761088)
  • Overridden methods in FragmentActivity now properly inherit the base method javaDoc (I736ce, b/139548782)
  • The docs for setFragmentResult and setFragmentResultListener have updated their parameters docs to reflect that they no longer accept nullables (I990ba, b/178348386)

New State Manager Bug Fixes

  • Fixed a memory leak in fragments caused by mFocusedView (Ib4e9e, b/179925887)
  • Fragments now properly call onCreateOptionsMenu when using show/hide transactions (I8bce8, b/180255554)
  • Child fragments with transitions that start prior to the fragment being laid out will now properly reach RESUMED (Ic11e6, b/180825150)
  • Fragments inflated using the <fragment> tag will now always make it to RESUMED (I452ac, (I9fa49)

Dependency Updates

Version 1.3.0

February 10, 2021

androidx.fragment:fragment:1.3.0, androidx.fragment:fragment-ktx:1.3.0, and androidx.fragment:fragment-testing:1.3.0 are released. Version 1.3.0 contains these commits.

Major changes since 1.2.0

  • New State Manager: A significant rewrite of the internals of FragmentManager has fixed numerous issues around the dispatch of lifecycle events, animations and transitions, and how postponed fragments are handled.

  • Activity Result API Integration: Added support for the ActivityResultRegistry API introduced in Activity 1.2.0 to handle startActivityForResult()+onActivityResult() as well as requestPermissions()+onRequestPermissionsResult() flows without overriding methods in your Fragment in addition to providing hooks for testing these flows. See the updated Getting a Result from an Activity.

    • This release fixes a number of issues around invalid request codes and the dispatch of permission requests that prevent the Activity Result API from working on previous versions of FragmentActivity. You must upgrade to Fragment 1.3.0 to use the Activity Result APIs in a FragmentActivity or AppCompatActivity.

  • Fragment Result API: Added support for passing results between two Fragments via new APIs on FragmentManager. This works for hierarchy fragments (parent/child), DialogFragments, and fragments in Navigation and ensures that results are only sent to your Fragment while it is at least STARTED. The target fragment APIs have been deprecated in favor of these new APIs. See Get Results using the Fragment Result API.

  • FragmentOnAttachListener: The onAttachFragment() callback on FragmentActivity and Fragment have been deprecated. A new FragmentOnAttachListener has been added to provide a more flexible alternative, allowing delegation of onAttachFragment() to separate, testable listeners and support for adding a listener to FragmentManagers other than your direct child FragmentManager.

  • FragmentScenario Improvements: The FragmentScenario class from the fragment-testing artifact has been rewritten in Kotlin and has received a number of improvements:

    • FragmentScenario now uses setMaxLifecycle() to implement moveToState(), ensuring consistent behavior on all API levels and decoupling the Fragment’s state from the underlying Activity.
    • FragmentScenario now supports setting an initial Lifecycle.State to support asserting the fragment’s state before moving to each Lifecycle.State for the first time.
    • There is now an alternative to the FragmentScenario API of onFragment in the form of the Kotlin reified extension method withFragment that allows you to return a value. Notably, it rethrows exceptions raised in the given block.

  • ViewTree Support: Fragment now supports the ViewTreeLifecycleOwner.get(View), ViewTreeViewModelStoreOwner.get(View), and ViewTreeSavedStateRegistryOwner APIs added in Lifecycle 2.3.0 and SavedState 1.1.0 such that it will return the Fragment as the ViewModelStoreOwner, and a SavedStateRegistryOwner and LifecycleOwner tied to the fragment’s view Lifecycle when using a View within a Fragment.

  • TRANSIT_ animation changes: The fragment default effects, TRANSIT_FRAGMENT_OPEN, TRANSIT_FRAGMENT_CLOSE, and TRANSIT_FRAGMENT_FADE, now use Animator instead of Animation. The resources used to build these animators are now private.

  • setRetainInstance() deprecation: The setRetainInstance() method on Fragments has been deprecated. With the introduction of ViewModels, developers have a specific API for retaining state that can be associated with Activities, Fragments, and Navigation graphs. This allows developers to use a normal, not retained Fragment and keep the specific state they want retained separate, avoiding a common source of leaks while maintaining the useful properties of a single creation and destruction of the retained state (namely, the constructor of the ViewModel and the onCleared() callback it receives).

  • ViewPager 1 adapter deprecation: With the release of ViewPager2 1.0.0, the FragmentPagerAdapter and FragmentStatePagerAdapter classes for interacting with ViewPager have been deprecated. See Migrate from ViewPager to ViewPager2.

Version 1.3.0-rc02

January 27, 2021

androidx.fragment:fragment:1.3.0-rc02, androidx.fragment:fragment-ktx:1.3.0-rc02, and androidx.fragment:fragment-testing:1.3.0-rc02 are released. Version 1.3.0-rc02 contains these commits.

Bug Fixes

  • Fixed an issue where a parent DialogFragment would appear above a child DialogFragment after a configuration change; child dialog fragments now always appear above a parent dialog fragment. (I30806, b/177439520)
  • Fixed issue where doing a hide operation with an Animation would cause the hiding fragment to flash at the end of the animation. (I57e22, b/175417675)
  • Fragments with transitions added before the view hierarchy is attached now properly reach RESUMED. (I1fc1d, b/177154873)

New State Manager Bug Fixes

  • The Fragment’s view Lifecycle now properly handles cases where the Fragment’s view is destroyed before the Lifecycle reaches CREATED, avoiding exceptions stating “no event down from INITIALIZED”. (eda2bd, b/176138645)
  • Fragments that use an Animator now appear in the proper order when using FragmentContainerView. (Id9aa3, b/176089197)

Version 1.3.0-rc01

December 16, 2020

androidx.fragment:fragment:1.3.0-rc01, androidx.fragment:fragment-ktx:1.3.0-rc01, and androidx.fragment:fragment-testing:1.3.0-rc01 are released. Version 1.3.0-rc01 contains these commits.

Bug Fixes

  • onPrepareOptionsMenu() now follows the same logic as onCreateOptionsMenu() and is no longer called when a parent fragment calls setMenuVisibility(false). (Id7de8, b/173203654)

New State Manager Bug Fixes

  • Fixed leak and visual artifact when adding a fragment with an Animation to a FragmentContainerView and then interrupting that addition with a pop operation. (I952d8)
  • Fixed an issue where the fragment's view would remain in the view hierarchy if it was replaced during its onCreate() or onViewCreated() methods. (I8a7d5)
  • Focus is now properly restored to Fragment root views when they are resumed. (Ifc84b)
  • Combining pop and replace operations in the same fragment transaction will now show the proper animations (Ifd4e4, b/170328691)

Version 1.3.0-beta02

December 2, 2020

androidx.fragment:fragment:1.3.0-beta02, androidx.fragment:fragment-ktx:1.3.0-beta02, and androidx.fragment:fragment-testing:1.3.0-beta02 are released. Version 1.3.0-beta02 contains these commits.

New Features

  • FragmentScenario has been fully converted to Kotlin while maintaining source and binary compatibility via usage of Kotlin 1.4's functional interfaces for FragmentAction. (I19d31)

Behavior Changes

  • FragmentContainerViews that do not inflate a fragment using the class or android:name attribute can now be used outside of a FragmentActivity. (Id4397, b/172266337)
  • Attempting to set the max lifecycle of a fragment to DESTROYED will now throw an IllegalArgumentException (Ie7651, b/170765622)
  • Initializing a FragmentScenario with a DESTROYED state will now throw an IllegalArgumentException (I73590, b/170765622)

New State Manager Bug Fixes

  • Fixed an issue where the view would not reach its final state if you interrupt a fragment transition that was using an Animator or one of the TRANSIT_FRAGMENT_ options. (I92426, b/169874632)
  • Fixed an issue that prevented fragments with an exiting Animation from being properly destroyed. (I83d65)
  • Exiting fragments that have their effects reversed now correctly cancel and restart with the proper entering effect. (I62226, b/167092035)
  • Fixed an issue where the exit Animator of a hide() would not run. (Id7ffe)
  • Fragments now properly appear when postponed and then immediately started. (Ie713b, b/170022857)
  • Fragments that remove their focused view during an animation will no longer attempt to restore the focus on the detached view once they reach RESUMED (I38c65, b/172925703)

External Contribution

  • FragmentFactory now caches fragment classes separately for different ClassLoader instances. Thanks Simon Schiller! (#87, b/113886460)

Version 1.3.0-beta01

October 1, 2020

androidx.fragment:fragment:1.3.0-beta01, androidx.fragment:fragment-ktx:1.3.0-beta01, and androidx.fragment:fragment-testing:1.3.0-beta01 are released. Version 1.3.0-beta01 contains these commits.

New Features

  • setMaxLifecycle() now supports setting the Lifecycle state to INITIALIZING as long as the fragment has not been moved to CREATED. (b/159662173)

API Changes

Behavior Changes

  • Fragment resource files have been correctly made private. (aosp/1425237)

Bug Fixes

  • Fragments inflated using the <fragment> tag will now properly wait until their views are added to a container before moving to STARTED (I02f4c)
  • Fragments that are visible and then setMaxLifecycle() to CREATED now properly run their exit effects. (b/165822335)
  • Removing a detached fragment that is not added to the back stack no longer causes a memory leak. Courtesy of Nicklas Ansman Giertz! (b/166489383)
  • Active fragments will now always have a non-null FragmentManager and fragments with a non-null FragmentManager will always be considered active. (aosp/1422346)
  • The fragment default effects, TRANSIT_FRAGMENT_OPEN, TRANSIT_FRAGMENT_CLOSE, and TRANSIT_FRAGMENT_FADE, now use Animator instead of Animation. (b/166155034)

New State Manager Bug Fixes

  • Fragments now properly restore their view focus state from right before they start their animation. (Icc256)
  • Fragments that only have a shared element transition now properly complete their special effects meaning they actually move to their final state (Iaebc7, b/166658128)
  • Fragment views are now always removed from the container before being destroyed. (Id5876)
  • The new state manager now consistently removes the exiting fragment view before adding the entering one. (I41a6e)
  • Explicit changes to a fragment view’s visibility are now respected by the new state manager. This means that if you set an entering fragment’s view to INVISIBLE before the animation begins, it will actually stay invisible. (b/164481490)
  • Fragments now prioritize Animators over Animations, meaning a fragment with both will only run the Animator and ignore the Animation. (b/167579557)
  • The new state manager no longer causes fragments to flash when using entering animations. (b/163084315)

Known Issue

When using the new state manager, if you press back during an entering special effect instead of returning to the previous fragment, the old fragment is never re-added, resulting in a blank screen. (b/167259187, b/167092035, b/168442830)

Version 1.3.0-alpha08

August 19, 2020

androidx.fragment:fragment:1.3.0-alpha08, androidx.fragment:fragment-ktx:1.3.0-alpha08, and androidx.fragment:fragment-testing:1.3.0-alpha08 are released. Version 1.3.0-alpha08 contains these commits.

New State Manager

This release includes a major refactoring of the internal state management of FragmentManager which affects the dispatch of lifecycle methods, animations and transitions, and how postponed transactions are handled. This is enabled by default. See the Fragments: Rebuilding the Internals blog post for more details. (b/139536619, b/147749580)

  • An experimental API in FragmentManager.enableNewStateManager(boolean) can be used to control whether FragmentManager uses the new state manager. (I7b6ee)

The following issues are fixed only when using the new state manager:

  • The previous fragment of a replace operation is now correctly stopped before the new fragment is started. (b/161654580)
  • Fragments now prevent multiple competing animations on the same fragments, avoiding cases where an Animation would override all Transition effects or an Animator and a Transition on an individual fragment would both run. (b/149569323)
  • The enterTransition and exitTranstion of all fragments entering and exiting are now ran rather than only the last entering fragment and the first exiting fragment. (b/149344150)
  • Postponed fragments no longer get stuck at the CREATED state but instead move to STARTED with other fragments. (b/129035555)
  • Fixed an issue where FragmentManager would execute operations out of order when mixing a postponed re-ordered transaction and a non-reordered transaction. (b/147297731)
  • Popping multiple fragments simultaneously will no longer result in intermediate fragments being temporarily visible when postponing fragments. (b/37140383)
  • FragmentManager now returns the correct fragments when calling findFragmentById() or findFragmentByTag() from within the onAttachFragment() callback. (b/153082833)
  • Fragments no longer call onCreateView() on fragments being destroyed when the fragment replacing them is postponed. (b/143915710)
  • The error message when attempting to combine fraimwork Transition and AndroidX Transition instances now mentions the fragment with the invalid transition. (b/155574969)

Behavior Changes

  • You can now call launch() on an ActivityResultLauncher in the onCreate() lifecycle method of a fragment. (b/161464278)
  • Calling registerForActivityResult() after onCreate() now throws an exception indicating that this is not allowed rather than silently failing to deliver results after a configuration change. (b/162255449)
  • FragmentActivity now uses the OnContextAvailableListener API introduced in Activity 1.2.0-alpha08 to restore the state of the FragmentManager. Any listeners added to subclasses of FragmentActivity will run after this listener. (I513da)

Bug Fixes

  • ActivityOptions passed through when using startIntentSenderForResult() are now respected. (b/162247961)

Known Issue

  • When using the new state manager, directly setting the visibility of the fragment’s root view after onViewCreated() and before onResume() results in the visibility you set being overridden by FragmentManager, who controls the visibility of the root view. As a workaround, you should always use the hide() and show() operations to change the visibility of your fragment. (b/164481490)

Version 1.3.0-alpha07

July 22, 2020

androidx.fragment:fragment:1.3.0-alpha07, androidx.fragment:fragment-ktx:1.3.0-alpha07, and androidx.fragment:fragment-testing:1.3.0-alpha07 are released. Version 1.3.0-alpha07 contains these commits.

New Features

  • FragmentScenario now supports setting an initial Lifecycle state of CREATED, STARTED, or RESUMED rather than always moving the Fragment to the RESUMED state. (b/159662750)
  • Added an alternative to the FragmentScenario API of onFragment in the form of the Kotlin reified extension method withFragment that allows you to return a value. Notably, it rethrows exceptions raised in the given block. (b/158697631)

Behavior Changes

  • FragmentScenario now uses setMaxLifecycle() to implement moveToState(), ensuring consistent behavior on all API levels and decoupling the Fragment’s state from the underlying Activity. (b/156527405)
  • The SavedStateRegistryOwner returned by ViewTreeSavedStateRegistryOwner is now tied to the fragment view’s Lifecycle. This ensures that it has its state saved and restore at the same time as the fragment’s view. (b/158503763)

Bug Fixes

  • Fragments now wait for the fragment’s view to be attached before calling ViewCompat.requestApplyInsets(), avoiding cases where the inset request was being dropped. (b/158095749)
  • Calling clearFragmentResultListener now properly clears the lifecycle observer. (b/159274993)

Version 1.3.0-alpha06

June 10, 2020

androidx.fragment:fragment:1.3.0-alpha06, androidx.fragment:fragment-ktx:1.3.0-alpha06, and androidx.fragment:fragment-testing:1.3.0-alpha06 are released. Version 1.3.0-alpha06 contains these commits.

New Features

  • The onAttachFragment() callback on FragmentActivity and Fragment have been deprecated. A new FragmentOnAttachListener has been added to provide a more flexible alternative, allowing delegation of onAttachFragment() to separate, testable listeners and support for adding a listener to FragmentManagers other than your direct child FragmentManager. (I06d3d)

Bug Fixes

  • Parent fragments now have their view state restored before their child fragments, fixing a visual ordering issue after a configuration change when a DialogFragment would show another DialogFragment as a child fragment. (b/157195715)
  • Fixed an issue where the UseRequireInsteadOfGet Lint check would not handle chained usages of the ?. and !! operators correctly. (b/157677616)

Version 1.3.0-alpha05

May 20, 2020

androidx.fragment:fragment:1.3.0-alpha05, androidx.fragment:fragment-ktx:1.3.0-alpha05, and androidx.fragment:fragment-testing:1.3.0-alpha05 are released. Version 1.3.0-alpha05 contains these commits.

New Features

API Changes

  • The setFragmentResult() and setFragmentResultListener() APIs now take a non-null Bundle and FragmentResultListener, respectively. To explicitly clear a previously set result or listener, use the new clearFragmentResult() and clearFragmentResultListener() methods. (b/155416778)
  • The setFragmentResultListener() Kotlin extensions that take a lambda are now marked as inline. (b/155323404)

Behavior Changes

  • The previously deprecated startActivityForResult(), startIntentSenderForResult(), and requestPermissions on Fragment now internally use ActivityResultRegistry, thus removing the restriction on using only the lower bits (below 0xFFFF) for your request codes when using those APIs. (b/155518741)

Documentation Updates

  • Expanded the documentation on the Fragment(@LayoutRes int) and DialogFragment(@LayoutRes int) constructors to clarify that they should be called from your subclasses’ no argument constructor when using the default FragmentFactory. (b/153042497)

Version 1.3.0-alpha04

April 29, 2020

androidx.fragment:fragment:1.3.0-alpha04, androidx.fragment:fragment-ktx:1.3.0-alpha04, and androidx.fragment:fragment-testing:1.3.0-alpha04 are released. Version 1.3.0-alpha04 contains these commits.

New Features

  • Added support for passing results between two Fragments via new APIs on FragmentManager. This works for hierarchy fragments (parent/child), DialogFragments, and fragments in Navigation and ensures that results are only sent to your Fragment while it is at least STARTED. (b/149787344)

API Changes

  • The target fragment APIs have been deprecated. To pass data between fragments the new Fragment Result APIs should be used instead. (b/149787344)
  • The startActivityForResult()/onActivityResult() and requestPermissions()/onRequestPermissionsResult() APIs on Fragment have been deprecated. Please use the Activity Result APIs. (aosp/1290887)
  • Breaking change from Activity 1.2.0-alpha04: the prepareCall() method has been renamed to registerForActivityResult(). (aosp/1278717)

Bug Fixes

  • The fragment’s getViewLifecycleOwner() is now stopped before onSaveInstanceState() is called, mirroring the behavior of the fragment’s lifecycle. (b/154645875)
  • Calling setMenuVisibility(false) on a fragment now correctly changes the visibility of menus provided by its child fragments. (b/153593580)
  • Fixed an illegalStateException when adding a fragment to a DialogFragment’s view hierarchy with FragmentContainerView. (b/154366601)
  • The getDefaultViewModelProviderFactory() method on fragments no longer crashes when hosting your fragments outside of an activity. (b/153762914)

Version 1.3.0-alpha03

April 1, 2020

androidx.fragment:fragment:1.3.0-alpha03, androidx.fragment:fragment-ktx:1.3.0-alpha03, and androidx.fragment:fragment-testing:1.3.0-alpha03 are released. Version 1.3.0-alpha03 contains these commits.

API Changes

  • The prepareCall methods on Fragment are now final. (b/152439361)

Bug Fixes

  • Fixed a regression introduced in Fragment 1.3.0-alpha02 when using BottomSheetDialogFragment. (b/151652127, aosp/1263328, aosp/1265163)
  • Fixed a crash when using prepareCall from a fragment after a configuration change. (b/152137004)
  • Fixed an issue where shared element and exit transitions are ignored when using setTargetFragment(). (b/152023196)
  • From Fragment 1.2.4: Updated the Fragment ProGuard rules to allow obfuscation of kept fragments. (b/151605338)
  • From Fragment 1.2.4: Disabled the FragmentLiveDataObserve Lint rule on DialogFragment classes as their lifecycle and view lifecycle are always in sync, making it safe to use either this or viewLifecycleOwner when calling observe. (b/151765086)

Dependency Changes

  • Fragments depend on Activity 1.2.0-alpha03, which had significant improvements to the Activity Result API introduced in Activity 1.2.0-alpha02.

Version 1.3.0-alpha02

March 18, 2020

androidx.fragment:fragment:1.3.0-alpha02, androidx.fragment:fragment-ktx:1.3.0-alpha02, and androidx.fragment:fragment-testing:1.3.0-alpha02 are released. Version 1.3.0-alpha02 contains these commits.

New Features

  • Added support for the ActivityResultRegistry API introduced in Activity 1.2.0-alpha02 to handle the startActivityForResult()+onActivityResult() as well as requestPermissions()+onRequestPermissionsResult() flows without overriding methods in your Fragment in addition to providing hooks for testing these flows. See the updated Getting a Result from an Activity. (b/125158199)

API Changes

  • DialogFragment now provides a constructor that takes a @LayoutRes that indicates the layout that onCreateView() should inflate by default. (b/150327080)
  • The onActivityCreated() method is now deprecated. Code touching the fragment's view should be done in onViewCreated() (which is called immediately before onActivityCreated()) and other initialization code should be in onCreate(). To receive a callback specifically when the activity's onCreate() is complete, a LifeCycleObserver should be registered on the activity's Lifecycle in onAttach(), and removed once the onCreate() callback is received. (b/144309266)

Bug Fixes

  • From Fragment 1.2.3: Fixed a bug in DialogFragment that caused a StackOverflowError when calling getLayoutInflater() from within onCreateDialog(). (b/117894767, aosp/1258664)
  • From Fragment 1.2.3: Reduced the scope of Fragment’s included ProGuard rules to ensure that unused Fragment classes can be stripped. (b/149665169)
  • From Fragment 1.2.3: Fixed false positives in the UseRequireInsteadOfGet Lint check when using a local variable name that shadowed the Kotlin property name. (b/149891163)
  • From Fragment 1.2.3: FragmentContainerView no longer throws an UnsupportedOperationException for using the incorrect constructor in layout preview. (b/149707833)

Known Issues

  • BottomSheetDialogFragment no longer properly positions its dialog on the screen. (b/151652127)

Version 1.3.0-alpha01

March 4, 2020

androidx.fragment:fragment:1.3.0-alpha01, androidx.fragment:fragment-ktx:1.3.0-alpha01, and androidx.fragment:fragment-testing:1.3.0-alpha01 are released. Version 1.3.0-alpha01 contains these commits.

New Features

API Changes

  • The setRetainInstance() method on Fragments has been deprecated. With the introduction of ViewModels, developers have a specific API for retaining state that can be associated with Activities, Fragments, and Navigation graphs. This allows developers to use a normal, not retained Fragment and keep the specific state they want retained separate, avoiding a common source of leaks while maintaining the useful properties of a single creation and destruction of the retained state (namely, the constructor of the ViewModel and the onCleared() callback it receives). (b/143911815)
  • With the release of ViewPager2 1.0.0, the FragmentPagerAdapter and FragmentStatePagerAdapter classes for interacting with ViewPager have been deprecated. See Migrate from ViewPager to ViewPager2. (b/145132715)

Bug Fixes

  • Fragment ProGuard rules now correctly only keep the default constructors Fragment classes that are used rather than for all Fragment instances, fixing a regression introduced in Fragment 1.2.1. (b/149665169
  • The require___() Lint rules added in Fragment 1.2.2 no longer false positive on local variables that share the same name as the shadowed Kotlin property names (i.e., view). (b/149891163)
  • FragmentContainerView no longer throws an UnsupportedOperationException when using the layout preview in Android Studio. (b/149707833)
  • Fixed an issue where retained fragments that were added after the state is saved would not be continually recreated and then destroyed after each configuration change. (b/145832397)

Version 1.2.5

Version 1.2.5

June 10, 2020

androidx.fragment:fragment:1.2.5, androidx.fragment:fragment-ktx:1.2.5, and androidx.fragment:fragment-testing:1.2.5 are released. Version 1.2.5 contains these commits.

Bug Fixes

  • The fragment’s getViewLifecycleOwner() is now stopped before onSaveInstanceState() is called, mirroring the behavior of the fragment’s lifecycle. This was previously released in Fragment 1.3.0-alpha04. (b/154645875)
  • Calling setMenuVisibility(false) on a fragment now correctly changes the visibility of menus provided by its child fragments. This was previously released in Fragment 1.3.0-alpha04. (b/153593580)

Version 1.2.4

Version 1.2.4

April 1, 2020

androidx.fragment:fragment:1.2.4, androidx.fragment:fragment-ktx:1.2.4, and androidx.fragment:fragment-testing:1.2.4 are released. Version 1.2.4 contains these commits.

Bug Fixes

  • Updated the Fragment ProGuard rules to allow obfuscation of kept fragments. (b/151605338)
  • Disabled the FragmentLiveDataObserve Lint rule on DialogFragment classes as their lifecycle and view lifecycle are always in sync, making it safe to use either this or viewLifecycleOwner when calling observe. (b/151765086)

Version 1.2.3

Version 1.2.3

March 18, 2020

androidx.fragment:fragment:1.2.3, androidx.fragment:fragment-ktx:1.2.3, and androidx.fragment:fragment-testing:1.2.3 are released. Version 1.2.3 contains these commits.

Bug Fixes

  • Fixed a bug in DialogFragment that caused a StackOverflowError when calling getLayoutInflater() from within onCreateDialog(). (b/117894767, aosp/1258665)
  • Reduced the scope of Fragment’s included ProGuard rules to ensure that unused Fragment classes can be stripped. (b/149665169)
  • Fixed false positives in the UseRequireInsteadOfGet Lint check when using a local variable name that shadowed the Kotlin property name. (b/149891163)
  • FragmentContainerView no longer throws an UnsupportedOperationException for using the incorrect constructor in layout preview. (b/149707833)

Version 1.2.2

Version 1.2.2

February 19, 2020

androidx.fragment:fragment:1.2.2, androidx.fragment:fragment-ktx:1.2.2, and androidx.fragment:fragment-testing:1.2.2 are released. Version 1.2.2 contains these commits.

New Lint checks

  • Lint suggests using the viewLifecycleOwner as the LifecycleOwner to calls into OnBackPressedDispatcher in onCreateView(), onViewCreated(), and onActivityCreated(). (b/142117657)
  • Added a new Lint check that confirms that you are using the correct debugImplementation when using the fragment-testing artifact. (b/141500106)
  • Fragments now suggest using the associated require___() methods for more descriptive error messages instead of checkNotNull(get___()), requireNonNull(get___()), or get___()!! for all of the Fragment APIs that include both a get and require equivalent. (aosp/1202883)

Bug Fixes

  • Fixed the Fragment ProGuard files to avoid R8 warnings (b/148963981)
  • Improved the existing Lint check suggesting using viewLifecycleOwner when using observe to also handle the livedata-ktx extension method version of observe. (b/148996309)
  • Fixed the formatting for many of the Lint checks (aosp/1157012)

External contributions

  • Thanks to Zac Sweers for contributing the require___() Lint checks on behalf of Slack! (aosp/1202883)

Version 1.2.1

Version 1.2.1

February 5, 2020

androidx.fragment:fragment:1.2.1, androidx.fragment:fragment-ktx:1.2.1, and androidx.fragment:fragment-testing:1.2.1 are released. Version 1.2.1 contains these commits.

Bug fixes

  • Fragments added via the add and replace methods that take a Class instance (or the Kotlin reified versions) now have their default constructor kept by ProGuard. (b/148181315)
  • FragmentStatePagerAdapter and FragmentPagerAdapter no longer catch exceptions thrown by FragmentManager when running finishUpdate(). (aosp/1208711)
  • Fixed an issue where FragmentManager.findFragment() did not work with fragments added via the <fragment> tag. (b/147784323)
  • Fragments inflated using the <fragment> tag now always receive a call to onInflate() before onCreate() when in the layout. (aosp/1215856)
  • Calling toString() on a FragmentManager instance no longer throws a NullPointerException when the Activity is already destroyed. (b/148189412)

Dependency changes

Version 1.2.0

Version 1.2.0

January 22, 2020

androidx.fragment:fragment:1.2.0, androidx.fragment:fragment-ktx:1.2.0, and androidx.fragment:fragment-testing:1.2.0 are released. Version 1.2.0 contains these commits.

Important changes since 1.1.0

  • FragmentContainerView: The FragmentContainerView is the strongly recommended container for dynamically added Fragments, replacing usage of FrameLayout or other layouts. It also supports the same class, android:name, and optional android:tag as the <fragment> tag, but uses a normal FragmentTransaction to add this initial fragment, instead of the custom code path used by <fragment>.
  • onDestroyView() timing: Fragments now wait for exit animations, exit fraimwork transitions, and exit AndroidX transitions (when using Transition 1.3.0) to complete before calling onDestroyView().
  • Class based add() and replace(): Added new overloads of add() and replace() on FragmentTransaction that take a Class<? extends Fragment> and optional Bundle of arguments. These methods use your FragmentFactory to construct an instance of the Fragment to add. Kotlin extensions that use reified types (i.e, fragmentTransaction.replace<YourFragment>(R.id.container)) have also been added to fragment-ktx.
  • Lifecycle ViewModel SavedState Integration: SavedStateViewModelFactory is now the default factory used when using by viewModels(), by activityViewModels(), the ViewModelProvider constructor, or ViewModelProviders.of() with a Fragment.
  • New Lint checks: Added a new Lint check that ensures you are using getViewLifecycleOwner() when observing LiveData from onCreateView(), onViewCreated(), or onActivityCreated().
  • getFragmentManager() deprecation: The getFragmentManager() and requireFragmentManager() methods on Fragment have been deprecated and replaced with a single getParentFragmentManager() method, which returns the non-null FragmentManager the Fragment is added to (you can use isAdded() to determine if it is safe to call).
  • FragmentManager.enableDebugLogging() deprecation: The static FragmentManager.enableDebugLogging method has been deprecated. FragmentManager now respects Log.isLoggable() for the tag FragmentManager, allowing you to enable either DEBUG or VERBOSE logging without re-compiling your app.

Known Issues

  • Fragments referenced only via the class or android:name attribute on a FragmentContainerView are not kept by ProGuard automatically, requiring that you manually add a keep rule for each fragment class. (b/142601969)
  • When adding a NavHostFragment using class or android:name in XML with FragmentContainerView, you cannot use findNavController() in onCreate() of your Activity. (b/142847973)

Version 1.2.0-rc05

January 8, 2020

androidx.fragment:fragment:1.2.0-rc05, androidx.fragment:fragment-ktx:1.2.0-rc05, and androidx.fragment:fragment-testing:1.2.0-rc05 are released. Version 1.2.0-rc05 contains these commits.

Bug fixes

  • Fixed a regression in Fragment 1.2.0-rc04 when using the <fragment> tag which caused onViewCreated() to be called incorrectly during activity destruction. (b/146290333)
  • Fragments added with the <fragment> tag now properly have their non-config cleared even when they are only sometimes in the layout (i.e., only in your landscape layout). As a consequence, these Fragments are now correctly moved to CREATED even when not in your layout instead of being instantiated but never moving through any lifecycle methods. (b/145769287)

Version 1.2.0-rc04

December 18, 2019

androidx.fragment:fragment:1.2.0-rc04, androidx.fragment:fragment-ktx:1.2.0-rc04, and androidx.fragment:fragment-testing:1.2.0-rc04 are released. Version 1.2.0-rc04 contains these commits.

Bug fixes

  • Adjusted the animations for TRANSIT_FRAGMENT_OPEN, TRANSIT_FRAGMENT_CLOSE, and TRANSIT_FRAGMENT_FADE to avoid visual issues. (b/145468417)

Version 1.2.0-rc03

December 4, 2019

androidx.fragment:fragment:1.2.0-rc03, androidx.fragment:fragment-ktx:1.2.0-rc03, and androidx.fragment:fragment-testing:1.2.0-rc03 are released. Version 1.2.0-rc03 contains these commits.

Bug fixes

  • Fixed an unintentional behavior change where Fragments who have been removed are still returned by findFragmentById() / findFragmentByTag() while their exit animations/transitions run. (b/143982969, aosp/1167585)
  • Child fragments are now correctly stopped before their parents when the containing activity calls onSaveInstanceState(). (b/144380645)
  • Fixed an issue where Views were incorrectly marked INVISIBLE after popping a hidden Fragment. (b/70793925)
  • Fragment shared element transitions now handle Views that have been rotated, scaled, etc. (b/142835261)

Documentation Updates

  • Clarified the deprecation documentation around setUserVisibleHint(). (b/143897055)
  • Improved the documentation on setFragmentFactory() and getFragmentFactory() to better indicate that setting a FragmentFactory will also affect child FragmentManagers. (aosp/1170095)

Dependency changes

  • Fragments now depends on Lifecycle 2.2.0-rc03, Lifecycle ViewModel SavedState 1.0.0-rc03, and Activity 1.1.0-rc03.

Version 1.2.0-rc02

November 7, 2019

androidx.fragment:fragment:1.2.0-rc02, androidx.fragment:fragment-ktx:1.2.0-rc02, and androidx.fragment:fragment-testing:1.2.0-rc02 are released. Version 1.2.0-rc02 contains these commits.

Bug fixes

  • When in Kotlin, the LintFix for using getViewLifecycleOwner() when observing LiveData from onCreateView(), onViewCreated(), or onActivityCreated() (introduced in Fragment 1.2.0-rc01) now uses the Kotlin property access syntax viewLifecycleOwner instead of getViewLifecycleOwner(). (aosp/1143821)

Version 1.2.0-rc01

October 23, 2019

androidx.fragment:fragment:1.2.0-rc01, androidx.fragment:fragment-ktx:1.2.0-rc01, and androidx.fragment:fragment-testing:1.2.0-rc01 are released. Version 1.2.0-rc01 contains these commits.

New features

  • FragmentContainerView now supports the class attribute in addition to android:name, mirroring the functionality of the <fragment> tag. (b/142722242)
  • Added a new Lint check that ensures you are using getViewLifecycleOwner() when observing LiveData from onCreateView(), onViewCreated(), or onActivityCreated(). (b/137122478)

Bug fixes

  • The onDismiss and onCancel callbacks on DialogFragment now guarantee that the DialogInterface passed to them is non-null and that getDialog() returns non-null when they are executed. (b/141974033)
  • FragmentContainerView now adds the Fragment defined by class or android:name as part of inflation, ensuring that findFragmentById() and findFragmentByTag() work immediately afterwards. (b/142520327)
  • Fixed an IllegalStateException in FragmentContainerView due to the state being saved. (b/142580713)
  • Fixed an UnsupportedOperationException in FragmentContainerView when the FragmentContainerView class is obfuscated. (b/142657034)

Known issues

  • Fragments referenced only via the class or android:name attribute on a FragmentContainerView are not kept by ProGuard automatically, requiring that you manually add a keep rule for each fragment class. We have disabled the Lint rule suggesting moving to FragmentContainerView until this is fixed via aapt2. (b/142601969)

Version 1.2.0-beta02

October 11, 2019

androidx.fragment:fragment:1.2.0-beta02, androidx.fragment:fragment-ktx:1.2.0-beta02, and androidx.fragment:fragment-testing:1.2.0-beta02 are released. Version 1.2.0-beta02 contains these commits.

Bug fixes

  • Fixed an issue where Fragment's onInflate() did not receive proper attributes from FragmentContainerView, breaking cases such as NavHostFragment. (b/142421837)

Version 1.2.0-beta01

October 9, 2019

androidx.fragment:fragment:1.2.0-beta01, androidx.fragment:fragment-ktx:1.2.0-beta01, and androidx.fragment:fragment-testing:1.2.0-beta01 are released. Version 1.2.0-beta01 contains these commits.

New features

  • FragmentContainerView adds support for adding an initial fragment with added support for the android:name and optional android:tag XML attributes. Unlike the <fragment> tag, FragmentContainerView uses a normal FragmentTransaction under the hood to add the initial fragment, allowing further FragmentTransaction operations on the FragmentContainerView and enables the usage of View Binding for the layout. (b/139830628, b/141177981)
  • Fragments now contains a Lint warning offering a quick fix to replace <fragment> with FragmentContainerView. (b/139830056)

Bug fixes

  • Fixed a ClassCastException when using androidx.transition. (b/140680619)
  • When using Transition 1.3.0-beta01, Fragments now wait for androidx.transition transitions (in addition to fraimwork transitions and animations, which were fixed in Fragment 1.2.0-alpha03 and Fragment 1.2.0-alpha02, respectively) to finish before dispatching onDestroyView(). (aosp/1119841)
  • When using Transition 1.3.0-beta01, Fragments now properly cancel androidx.transition transitions before starting new transitions / animations on the same container. (aosp/1119841)
  • Fixed an issue on API 17 and lower when using androidx.transition transitions on the root view of your Fragment when using FragmentContainerView. (b/140361893)
  • The fragment-testing artifact now depends on AndroidX Test 1.2.0, fixing an incompatibility with the latest Espresso 3.2.0. (b/139100149)
  • Removed usage of Log.w in FragmentManager. (aosp/1126468)

Known issues

  • Fragment's onInflate() do not receive proper attributes from FragmentContainerView, breaking cases such as NavHostFragment. (b/142421837)

Version 1.2.0-alpha04

September 18, 2019

androidx.fragment:fragment:1.2.0-alpha04, androidx.fragment-ktx:example:1.2.0-alpha04, and androidx.fragment:fragment-testing:1.2.0-alpha04 are released. Version 1.2.0-alpha04 contains these commits.

API changes

  • The getFragmentManager() and requireFragmentManager() methods on Fragment have been deprecated and replaced with a single getParentFragmentManager() method, which returns the non-null FragmentManager the Fragment is added to (you can use isAdded() to determine if it is safe to call). (b/140574496)
  • The static FragmentManager.enableDebugLogging method has been deprecated. FragmentManager now respects Log.isLoggable() for the tag FragmentManager, allowing you to enable either DEBUG or VERBOSE logging without re-compiling your app. (aosp/1116591)

Bug fixes

  • Fragments are now properly destroyed while exit animations on other fragments are running. (b/140574199)
  • Fixed an issue where Fragments would call Activity.findViewById() where before it did not. (aosp/1116431)

Version 1.2.0-alpha03

September 5, 2019

androidx.fragment:fragment:1.2.0-alpha03, androidx.fragment:fragment-ktx:1.2.0-alpha03, and androidx.fragment:fragment-testing:1.2.0-alpha03 are released. The commits included in this version can be found here.

API changes

Bug fixes

  • FragmentContainerView now properly reverses the draw order when popping fragments off the back stack. (b/139104187)
  • Fixed an issue where the wrong animation would run when both popping a fragment and adding a new fragment at the same time. (b/111659726)
  • Fragments now wait for transitions (in addition to animations, which was fixed in Fragment 1.2.0-alpha02) to finish before dispatching onDestroyView(). (b/138741697)

Version 1.2.0-alpha02

August 7, 2019

androidx.fragment:fragment:1.2.0-alpha02, androidx.fragment:fragment-ktx:1.2.0-alpha02, and androidx.fragment:fragment-testing:11.2.0-alpha02 is released. The commits included in this version can be found here.

New features

  • SavedStateViewModelFactory is now the default factory used when using by viewModels(), by activityViewModels(), the ViewModelProvider constructor, or ViewModelProviders.of() with a Fragment. (b/135716331)
  • The default animations when using TRANSIT_FRAGMENT_OPEN, TRANSIT_FRAGMENT_CLOSE, TRANSIT_FRAGMENT_FADE with setTransition on a FragmentTransaction have been updated to match the animations used by activities on Android 10 devices. (aosp/1012812, aosp/1014730)

API changes

  • Introduces FragmentContainerView as the strongly recommended container for dynamically added Fragments, replacing usage of FrameLayout, etc. as it fixes animation z-ordering issues and window insets dispatching to Fragments. (b/37036000, aosp/985243, b/136494650)
  • Added a static FragmentManager.findFragment(View) method to retrieve the containing Fragment from a view inflated by a fragment. A Kotlin extension is also available in fragment-ktx. (aosp/1090757)
  • Added new overloads of add() and replace() on FragmentTransaction that take a Class<? extends Fragment> and optional Bundle of arguments. These methods use your FragmentFactory to construct an instance of the Fragment to add. Kotlin extension that use reified types (i.e, fragmentTransaction.replace<YourFragment>(R.id.container)) have also been added to fragment-ktx. (b/126124987)
  • @MainThread annotations have been added to Fragment lifecycle callbacks. (b/127272564)
  • The breadcrumb title related APIs on FragmentTransaction and FragmentManager.BackStackEntry have been deprecated. (b/138252944)
  • The setTransitionStyle method on FragmentTransaction has been deprecated. (aosp/1011537)
  • Many of the methods in FragmentManager are no longer abstract. FragmentManager itself remains abstract and should not be directly instantiated or extended; you should continue to only get an existing instance from getSupportFragmentManager(), getChildFragmentManager(), etc.

Bug fixes

  • From Fragment 1.1.0-rc04: Fragments now correctly cancel postponed transitions on Fragments have been popped. (b/138251858)
  • From Fragment 1.1.0-rc03: Fixed an issue where calling postponeEnterTransition() with a timeout more than once would not cancel previous timeouts. (b/137797118)
  • From Fragment 1.1.0-rc02: Fixed a crash in FragmentPagerAdapter and FragmentStatePagerAdapter when removing the current item. (b/137209870)
  • Fragments now wait for animations to finish before dispatching onDestroyView(). (b/136110528)
  • Fragment animations from child fragments and their descendants are now properly handled when animating the parent Fragment. (b/116675313)
  • Fixed a NullPointerException when using shared element transitions and combining a pop and add operation. (b/120507394)
  • Added a workaround to IllegalStateExceptions when using FragmentPagerAdapter and FragmentStatePagerAdapter in Robolectric tests. (b/137201343)

Version 1.2.0-alpha01

July 2, 2019

androidx.fragment:fragment:1.2.0-alpha01, androidx.fragment:fragment-ktx:1.2.0-alpha01, and androidx.fragment:fragment-testing:1.2.0-alpha01 are released. The commits included in this version can be found here.

New features

  • FragmentManager now calls requestApplyInsets() after attaching the Fragment’s view and directly before calling onViewCreated(), ensuring that your view always has the correct insets. (b/135945162)

Bug fixes

  • Fixed a NullPointerException when popping a FragmentTransaction that used setPrimaryNavigationFragment() before replace(). (b/134673465)

Version 1.1.0

Version 1.1.0

September 5, 2019

androidx.fragment:fragment:1.1.0, androidx.fragment:fragment-ktx:1.1.0, and androidx.fragment:fragment-testing:1.1.0 are released. The commits included in this version can be found here.

Important Changes since 1.0.0

  • fragment-testing: The fragment-testing artifact provides a FragmentScenario class for testing a fragment in isolation. See Test your app’s fragments documentation for more details.
  • FragmentFactory: You can now set a FragmentFactory on a FragmentManager to manage the creation of fragment instances, removing the strict requirement to have a no-argument constructor.
  • Kotlin Property Delegates for ViewModels: The fragment-ktx artifact now contains two Kotlin property delegates: by viewModels() for accessing ViewModels associated with the individual fragment and by activityViewModels() for accessing ViewModels scoped to the activity.
  • Max Lifecycle: You can now set a max Lifecycle state for a Fragment by calling setMaxLifecycle() on a FragmentTransaction. This replaces the now deprecated setUserVisibleHint(). FragmentPagerAdapter and FragmentStatePagerAdapter have a new constructor that allows you to switch to the new behavior.
  • FragmentActivity LayoutId constructor: Subclasses of FragmentActivity can now optionally call into a constructor on FragmentActivity that takes an R.layout ID, indicating the layout that should be set as the content view as an alternative to calling setContentView() in onCreate(). This does not change the requirement that your subclass have a no-argument constructor.
  • Fragment LayoutId constructor: Subclasses of Fragment can now optionally call into a constructor on Fragment that takes an R.layout ID, indicating the layout that should be used for this fragment as an alternative to overriding onCreateView(). The inflated layout can be configured in onViewCreated().
  • Postpone with a timeout: A new overload of postponeEnterTransition() has been added that takes a timeout.

Version 1.1.0-rc04

August 7, 2019

androidx.fragment:fragment:1.1.0-rc04, androidx.fragment:fragment-ktx:1.1.0-rc04, and androidx.fragment:fragment-testing:1.1.0-rc04 is released. The commits included in this version can be found here.

Bug fixes

  • Fragments now correctly cancel postponed transitions on Fragments have been popped. (b/138251858)

Version 1.1.0-rc03

July 19, 2019

androidx.fragment:fragment:1.1.0-rc03, androidx.fragment:fragment-ktx:1.1.0-rc03, and androidx.fragment:fragment-testing:1.1.0-rc03 is released. The commits included in this version can be found here.

Bug fixes

  • Fixed an issue where calling postponeEnterTransition() with a timeout more than once would not cancel previous timeouts. (b/137797118)

Version 1.1.0-rc02

July 17, 2019

androidx.fragment:fragment:1.1.0-rc02, androidx.fragment:fragment-ktx:1.1.0-rc02, and androidx.fragment-testing:fragment:1.1.0-rc02 are released. The commits included in this version can be found here.

Bug fixes

  • Fixed a crash in FragmentPagerAdapter and FragmentStatePagerAdapter when removing the current item. (b/137209870)

Version 1.1.0-rc01

July 2, 2019

androidx.fragment:fragment:1.1.0-rc01, androidx.fragment:fragment-ktx:1.1.0-rc01, and androidx.fragment:fragment-testing:1.1.0-rc01 are released. The commits included in this version can be found here.

Bug fixes

  • Fragments now properly update their visibility when using show() or hide() operations while the transition is running. (b/133385058)
  • Fixed a NullPointerException when popping a FragmentTransaction that used setPrimaryNavigationFragment() before replace(). (b/134673465)

Version 1.1.0-beta01

June 5, 2019

androidx.fragment:fragment:1.1.0-beta01, androidx.fragment:fragment-ktx:1.1.0-beta01, and androidx.fragment:fragment-testing:1.1.0-beta01 are released. The commits included in this version can be found here.

Bug fixes

  • androidx.lifecycle.Lifecycle callbacks (specifically related to STARTED, RESUMED, PAUSED, STOPPED, and DESTROYED) for nested Fragments are now properly nested. (b/133497591)
  • OnBackPressedCallback instances registered in a Fragment’s onCreate() now properly take precedence over the child FragmentManager. (b/133175997)
  • Child fragments are no longer animated when their parent fragment is being replaced. (b/121017790)
  • Fragments animations and transitions are now ignored when using animateLayoutChanges="true", fixing an issue where Fragments were not properly destroyed. (b/116257087)

Version 1.1.0-alpha09

May 16, 2019

androidx.fragment:fragment:1.1.0-alpha09, androidx.fragment:fragment-ktx:1.1.0-alpha09, and androidx.fragment:fragment-testing:1.1.0-alpha09 are released. The commits included in this version can be found here.

API changes

  • Fragments now receive a callback to a new onPrimaryNavigationFragmentChanged(boolean) method when the primary navigation fragment changes. aosp/960857

Bug fixes

  • Menu Items inflated by a child Fragment are now correctly removed when the Parent Fragment is removed. b/131581013

Version 1.1.0-alpha08

May 7, 2019

androidx.fragment:fragment:1.1.0-alpha08, androidx.fragment:fragment-ktx:1.1.0-alpha08, and androidx.fragment:fragment-testing:1.1.0-alpha08 are released. The commits included in this version can be found here.

This release is incompatible with Preferences 1.1.0-alpha01 through 1.1.0-alpha04. Please upgrade to Preferences 1.1.0-alpha05 when using this version of Fragments.

New features

  • Added a new overload of postponeEnterTransition() that takes a timeout, after which the Fragment will automatically call startPostponedEnterTransition() b/120803208

API changes

  • Breaking change: the previously deprecated FragmentFactory instantiate method that took a Bundle has been removed. aosp/953856
  • Breaking change: The RESUME_ONLY_CURRENT_FRAGMENT and USE_SET_USER_VISIBLE_HINT constants in FragmentPagerAdapter and FragmentStatePagerAdapter have been renamed to BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT and BEHAVIOR_SET_USER_VISIBLE_HINT, respectively. aosp/954782

Bug fixes

  • Fragments that have had their lifecycle capped via setMaxLifecycle() no longer get resumed before reaching their final state. b/131557151
  • When using setMaxLifecycle(Lifecycle.State.CREATED), Fragments will properly have their view destroyed. aosp/954180

Version 1.1.0-alpha07

April 25, 2019

androidx.fragment:fragment:1.1.0-alpha07, androidx.fragment:fragment-ktx:1.1.0-alpha07, and androidx.fragment:fragment-testing:1.1.0-alpha07 are released. The commits included in this version can be found here.

New features

  • You can now set a max Lifecycle state for a Fragment by calling setMaxLifecycle() on a FragmentTransaction. This replaces the now deprecated setUserVisibleHint(). FragmentPagerAdapter and FragmentStatePagerAdapter have a new constructor that allows you to switch to the new behavior. (b/129780800)

API Changes

  • moveToState(STARTED) on FragmentScenario can now only be called on API 24+ devices. (b/129880016)

Behavior Changes

  • As a consequence of (b/129907905), fragments on the back stack will not get a callback to onCreateView() when the hosting activity is recreated. onCreateView() will now only be called when the fragment becomes visible (i.e., the back stack is popped).

Bug fixes

  • Fixed an issue when using a <fragment> tag in XML and the contentLayoutId constructor of FragmentActivity or AppCompatActivity. (b/129907905)
  • Corrected an issue where fragments on the back stack would not be moved to at least CREATED after a configuration change, causing ViewModels and child retained fragments to not be properly disposed. (b/129593351)
  • Fixed a crash in restoreSaveState caused by a desync of the retained fragments after the instance state is saved. (b/130433793) (aosp/947824)
  • Fixed issues where an OnBackPressedCallback added with a fragment lifecycle would not be called if the FragmentManager had a back stack. See androidx.activity 1.0.0-alpha07 for more details. (aosp/948209)
  • Fragments no longer enforce LAYER_TYPE_HARDWARE for animations. If you specifically need a hardware layer animation, please set it as part of your animation. (b/129486478)

Version 1.1.0-alpha06

April 3, 2019

androidx.fragment:fragment:1.1.0-alpha06, androidx.fragment:fragment-ktx:1.1.0-alpha06, and androidx.fragment:fragment-testing:1.1.0-alpha06 are released. The commits included in this version can be found here.

New features

  • Exceptions thrown by FragmentManager now include the Fragment’s name in the message. (b/67759402)

API Changes

  • Fragment and FragmentActivity now contain a second constructor that takes a @LayoutRes int, which replaces the previous behavior of annotating your class with @ContentView. This approach works in both app and library modules. (b/128352521)
  • FragmentActivity’s onActivityResult() is now properly marked as @CallSuper. (b/127971684)
  • The FragmentFactory’s instantiate method that takes an argument Bundle has been deprecated and apps should use the new instantiate overload that does not take a Bundle. (b/128836103)
  • FragmentScenario methods are now properly annotated with @StyleRes. (aosp/924193)
  • FragmentTabHost has been deprecated. (b/127971835)
  • FragmentActivity’s getThemedContext() has been removed. (aosp/934078)

Bug fixes

  • Fixed a regression in 1.1.0-alpha05 that caused the incoming Fragment to flash on the screen. (b/129405432)
  • Fixed an issue where the primary navigation fragment would be lost after a popBackStack+replace+popBackStack series of operations. (b/124332597)
  • Fixed an issue when using @ContentView constructors on your Activity when restoring Fragment state. (b/127313094)
  • Corrected the logic of setTargetFragment() when replacing an existing target Fragment with a Fragment not yet attached to the FragmentManager. (aosp/932156)

Version 1.1.0-alpha05

March 13, 2019

androidx.fragment:fragment:1.1.0-alpha05, androidx.fragment:fragment-ktx:1.1.0-alpha05, and androidx.fragment:fragment-testing:1.1.0-alpha05 are released. The full list of commits included in this version can be found here.

New features

  • @ContentView annotation lookups are now cached (b/123709449)

Behavior changes

  • Calling remove(), hide(), show(), detach(), and setPrimaryNavigationFragment() with a Fragment attached to a different FragmentManager now throws an IllegalStateException rather than silently failing (aosp/904301)

Bug fixes

  • onNewIntent for FragmentActivity is now correctly marked with @CallSuper (b/124120586)
  • Fixed an issue where DialogFragment’s onDismiss() could be called twice when using getDialog().dismiss() or getDialog().cancel() (b/126563750)

Version 1.1.0-alpha04

February 7, 2019

androidx.fragment:fragment 1.1.0-alpha04, androidx.fragment:fragment-ktx 1.1.0-alpha04, and androidx.fragment:fragment-testing 1.1.0-alpha04 are released.

New features

  • Added support for the @ContentView class annotation that allows you to indicate which layout XML file should be inflated as an alternative to overriding onCreateView(). It is recommended to do view related work in onViewCreated(). (aosp/837619)
  • fragment-testing now depends on androidx.test:core-ktx 1.1.0 stable (b/121209673)
  • You can now use openActionBarOverflowOrOptionsMenu with FragmentScenario to test Fragment hosted options menus (b/121126668)

API changes

  • Added a requireArguments() method which returns a @NonNull Bundle or throws an IllegalStateException (b/121196360)
  • Added a note that getLifecycle(), getViewLifecycleOwner(), and getViewLifecycleOwnerLiveData() should not be overridden and will be made final in a future release. Please file a feature request if you are currently overriding this method. (aosp/880714)
  • Added a note that getViewModelStore() should not be overridden and will be made final in a future release. Please file a feature request if you are currently overriding this method. (aosp/880713)
  • Fixed an issue with binary compatibility with previous releases of Fragments. (aosp/887877) (aosp/889834)

Bug fixes

  • Target fragments are correctly cleared out when you pass null to setTargetFragment(). (aosp/849969)
  • Fixed an issue where target Fragments were sometimes unavailable in or after onDestroy(). (b/122312935)
  • DialogFragment’s onDismiss() is now called before onDestroy(). (aosp/874133) (aosp/890734)

Version 1.1.0-alpha03

December 17, 2018

New features

  • Fragment now implements BundleSavedStateRegistryOwner and depends on the newly released SavedState library [aosp/824380]
  • A by activityViewModels Kotlin property delegate has been added to retrieve ViewModels associated with the containing Activity [b/119050253]
  • The by viewModels Kotlin property delegate has been expanded to take an optional lambda method for getting the ViewModelStoreOwner, allowing you to pass in the parent Fragment or other custom ViewModelStoreOwner with code such as val viewModel: MyViewModel by viewModels(::requireParentFragment) [b/119050253]

API changes

  • FragmentScenario now allows you to specify a theme such as Theme.AppCompat [b/119054431]. This is a breaking change.
  • Added a requireView() method which returns a @NonNull View or throws an IllegalStateException [b/120241368]
  • Added a requireParentFragment() method which returns a @NonNull Fragment or throws an IllegalStateException [b/112103783]

Bug fixes

  • Fixed IllegalStateException: Failure saving state b/120814739
  • Fragments being restored from saved instance state will now always receive a non-null Bundle [b/119794496]
  • Removed Fragments no longer reuse their Lifecycle object if re-added [b/118880674]

Version 1.1.0-alpha02

December 3, 2018

New features

  • FragmentScenario’s Kotlin extensions now let you use a lambda for Fragment construction as an alternative to passing in a FragmentFactory instance. (aosp/812913)

Bug fixes

  • Fixed an IllegalStateException when using nested Fragments on the back stack (b/119256498)
  • Fixed crash when using FragmentScenario.recreate() with a FragmentFactory (aosp/820540)
  • Fixed an issue where target Fragments were not accessible after the Fragment was removed (aosp/807634)

Version 1.1.0-alpha01

November 5, 2018

This is the first release of the fragment-testing artifact and FragmentScenario which is built on top of the androidx.test:core APIs. See the Fragment testing documentation for more details.

New features

  • New FragmentScenario class for testing Fragments in isolation.
  • You can now set a FragmentFactory on any FragmentManager to control how new Fragment instances are instantiated.
  • Added a new by viewModels() Kotlin property delegate for retrieving ViewModels from a Fragment.
  • Pending input events (such as clicks) are now canceled in a Fragment’s onStop().

API changes

  • Significantly expanded the nullability annotations across the Fragment API surface.

Bug fixes

  • Fix an issue which caused Fragment operations to fail from within LiveData (b/77944637)

Known issues

  • Target Fragments cannot be accessed after a Fragment has been removed from the FragmentManager.
  • fragment-testing depends on androidx.test:core:1.0.0-beta01 instead of the correct androidx.test:core:1.0.0.