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[CP-stable] Add empty io.flutter.app.FlutterApplication to give deprecation notice, and un-break projects that have not migrated (#164730 )

This is just the engine portion of https://github.com/flutter/flutter/pull/164343. I.e., it does not contain the test change.

Copied from the original cherry pick pr:

This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request)
Please fill in the form below, and a flutter domain expert will evaluate this cherry pick request.

### Issue Link:
What is the link to the issue this cherry-pick is addressing?

https://github.com/flutter/flutter/issues/164024

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples

https://github.com/flutter/flutter/issues/164024: Add back an empty `io.flutter.app.FlutterApplication` for Android apps that reference that class post v2 embedder migration

### Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch)

The class does not provide any additional funcitonality, but it class was removed without sufficient notice in the breaking changes section of the Flutter documentation. As such, consumers of this class were broken without sufficient time to migrate.

### Workaround:
Is there a workaround for this issue?

Flutter projects which need a custom `Application` can instead simply extend an `android.app.Application`. There is no reason to extend a `FlutterApplication`.

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

### Validation Steps:
What are the steps to validate that this fix works?

Either make a flutter app which depends on this class, or run the spell check integration tests:
```
# from the .../flutter/dev/devicelab directory
../../bin/cache/dart-sdk/bin/dart bin/test_runner.dart test -t spell_check_test
```

2025-03-11 20:50:28 +00:00

scripts

gclient template file clarifications (#160882 )

2024-12-27 19:36:20 +00:00

src

[CP-stable] Add empty io.flutter.app.FlutterApplication to give deprecation notice, and un-break projects that have not migrated (#164730 )

2025-03-11 20:50:28 +00:00

README.md

Clarify where gclient is run from. (#160889 )

2024-12-27 21:37:24 +00:00

README.md

Flutter Engine

`gclient` bootstrap

Flutter engine uses gclient to manage dependencies.

If you've already cloned the flutter repository:

Copy one of the engine/scripts/*.gclient to the root folder as .gclient:
1. Googlers: copy rbe.gclient to enable faster builds with RBE
2. Everyone else: copy standard.gclient
run gclient sync from the root folder

README.md

Flutter Engine

gclient bootstrap

`gclient` bootstrap