Basics for System Back
summary
Android 13 introduces an ahead-of-time System Back model with a new platform API, onBackInvokedCallback, and requires apps to opt in via enableOnBackInvoked=true in the manifest; when registered the system knows before the gesture whether the app will handle Back and shows a Launcher preview otherwise. Migrate using AndroidX Activity 1.6 (or Compose’s BackHandler), move per-view logic to register/unregister callbacks on state changes (drawer example), and expect legacy onBackPressed removal in Android 14.
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chapters (16)
- 0:00Introduction to back gesture
- 0:15Predictive back goal
- 2:10Ahead-of-time model
- 3:11OnBackInvokedCallback API
- 4:22Opting into predictive back
- 5:15Jetpack libraries update
- 5:47OnBackPressedDispatcher
- 7:24Handling multiple callbacks
- 8:32Fragment back navigation
- 9:25BackHandler in Compose
- 10:02Migrating legacy back code
- 10:29Low-level API integration
- 10:59Implementing drawer layout
- 11:42Registering callbacks
- 12:27Updating callback state
- 13:10Future plans and resources
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