API 36 Is Due August 31: The Android 16 Changes That Break Real Apps

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        enableEdgeToEdge()
        super.onCreate(savedInstanceState)
        setContent {
            AppTheme {
                Scaffold(bottomBar = { CheckoutBar() }) { innerPadding ->
                    // The classic bug: ignoring innerPadding puts the last rows under the bar.
                    OrderList(contentPadding = innerPadding)
                }
            }
        }
    }
}

@Composable
fun CameraScreen() {
    Box(Modifier.fillMaxSize()) {
        CameraPreview(Modifier.fillMaxSize())               // behind the bars, deliberately
        ShutterControls(
            Modifier
                .align(Alignment.BottomCenter)
                .windowInsetsPadding(WindowInsets.safeDrawing) // controls stay tappable
        )
    }
}

// Before: never called when targeting API 36 on an Android 16+ device.
override fun onBackPressed() {
    if (editor.hasUnsavedChanges) showDiscardDialog() else super.onBackPressed()
}

// After (Views): enabled only while there is something to protect.
private val discardGuard = object : OnBackPressedCallback(false) {
    override fun handleOnBackPressed() = showDiscardDialog()
}

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    onBackPressedDispatcher.addCallback(this, discardGuard)
    editor.onDirtyChanged = { dirty -> discardGuard.isEnabled = dirty }
}

// After (Compose): same rule, expressed as state.
@Composable
fun EditorScreen(state: EditorState, onDiscardRequest: () -> Unit) {
    BackHandler(enabled = state.hasUnsavedChanges) { onDiscardRequest() }
    EditorContent(state)
}