Audio_service: onStop crashing app in example project

[samry]

Which API doesn't behave as documented, and how does it misbehave?

When the onStop() method is called, everything goes well until super.onStop() is called, and more specifically, when it runs _backgroundChannel.invokeMethod('stopped').

I receive the following error:

Tried to send a platform message response, but FlutterJNI was detached from native C++. Could not send. Response ID: 37

I was running into this issue in my project and assumed it was something I was doing wrong, but I've been able to replicate the error just in the example project.

In my app, this causes a crash, and in the example app it causes AudioService.runnning to return true, and AudioService.stop() to never complete (as it's awaiting super.onStop())

Minimal reproduction project
Provide a link here using one of two options:

I am using the example project. The problem occurs when the onStop() method is called.

To Reproduce (i.e. user steps, not code)
Steps to reproduce the behavior:

1. Run example project
2. Click AudioPlayer
3. Play Audio
4. Stop Audio

Error messages

Tried to send a platform message response, but FlutterJNI was detached from native C++. Could not send. Response ID: 37

Expected behavior

Graceful shutdown.

Runtime Environment (please complete the following information if relevant):

• Device: Google Pixel 3a
• OS: Android 10

Flutter SDK version

[✓] Flutter (Channel stable, 1.20.3, on Mac OS X 10.15.5 19F101, locale en-US)

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.1)
[✓] Xcode - develop for iOS and macOS (Xcode 11.6)
[!] Android Studio (version 4.0)
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
[✓] Connected device (1 available)

[ryanheise]

I'll track this issue on #225 . This issue was supposedly fixed in flutter in that it should no longer crash anymore (although the logs do still appear). If you are still getting a crash, that is concerning, and so it would be great if you could mention this on the other issue.