Android's v1 embedding has been removed in Flutter 3.29.0. This follows the deprecation described in Android v1 embedding app and plugin creation deprecation. The following is a full list of classes removed.

io.flutter.app.FlutterActivity
io.flutter.app.FlutterActivityDelegate
io.flutter.app.FlutterActivityEvents
io.flutter.app.FlutterApplication
io.flutter.app.FlutterFragmentActivity
io.flutter.app.FlutterPlayStoreSplitApplication
io.flutter.app.FlutterPluginRegistry

io.flutter.embedding.engine.plugins.shim.ShimPluginRegistry
io.flutter.embedding.engine.plugins.shim.ShimRegistrar

io.flutter.view.FlutterMain
io.flutter.view.FlutterNativeView
io.flutter.view.FlutterView

If your project references any of the above classes, consult the following list for instructions on migration.

• io.flutter.app.FlutterActivity was replaced with io.flutter.embedding.android.FlutterActivity.
• io.flutter.app.FlutterActivityDelegate was replaced with io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.
• io.flutter.app.FlutterActivityEvents was removed.
• io.flutter.app.FlutterApplication was removed. Flutter projects with custom Application implementations should instead extend the base android.app.Application.
• io.flutter.app.FlutterFragmentActivity was replaced with io.flutter.embedding.android.FlutterFragmentActivity.
• io.flutter.app.FlutterPlayStoreSplitApplication was replaced with io.flutter.embedding.android.FlutterPlayStoreSplitApplication.
• io.flutter.app.FlutterPluginRegistry was removed, as it only served to let plugins support apps using the v1 embedding.
• io.flutter.embedding.engine.plugins.shim.ShimPluginRegistry was removed, as it only served to support let plugins support apps using the v1 embedding.
• io.flutter.embedding.engine.plugins.shim.ShimRegistrar was removed, as it only served to support let plugins support apps using the v1 embedding.
• io.flutter.view.FlutterMain was replaced by io.flutter.embedding.engine.loader.FlutterLoader.
• io.flutter.view.FlutterNativeView was replaced by io.flutter.embedding.android.FlutterView.
• io.flutter.view.FlutterView was replaced by io.flutter.embedding.android.FlutterView.

Plugins should remove the registerWith method from their FlutterPlugin interface implementation:

public static void registerWith(@NonNull io.flutter.plugin.common.PluginRegistry.Registrar registrar);

For an example of this migration, check out the pull request to remove this method from the Flutter team-owned plugins: flutter/packages#6494.

Landed in version: 3.28.0-0.1.pre
In stable release: 3.29