Privacy Sandbox sdks are a piece of android functionality that feature flutter wishes to make easy for developers to use.

Privacy sandbox relies on tooling that depends on android app bundles. flutter build aab is a supported flutter command that builds an app bundle but build apk and run do not go through the android app bundle phase.

Additionally the fluter android team considers not building apks from app bundles technical debt.

The umbrella bug will track the work the flutter team does to make privacy sandbox sdks easy to consume while not regressing in existing functionality.

Googler only supplemental documentation go/flutter-issue-170825

• Milestone 1: A new flutter command exists that will build a universal apk from an aab flutter build aab-apk ☔ Migrate flutter build apk and flutter run to first build an aab then build an apk. #166751
• Milestone 2: Flutter build apk is replaced by flutter build aab-apk with an opt in flag
• Milestone 3: Flutter build apk supports building privacy sandbox dependencies when opt in flag is used
• Milestone 4: Flutter run supports building privacy sandbox dependencies when opt in flag is used
• Milestone 5: Opt in flag is changed to Opt out flag.
• Milestone 6: Opt out flag is removed and legacy apk and run code is removed .

https://buganizer.corp.google.com/issues/390131309