Audio_service: FlutterJNI was detached from native C++ when calling AudioService.start

[ReaganRealones]

I am using flutter v1.12.13+hotfix.8(Released in Feb 2020) and I followed the example but whenever I call AudioService.start I get the following in the Debug Console

D/FlutterEngine( 6065): Destroying.
D/FlutterEnginePluginRegistry( 6065): Destroying.
W/FlutterJNI( 6065): Tried to send a platform message response, but FlutterJNI was detached from native C++. Could not send. Response ID: 4

And then, all subsequent calls on AudioService are not picked up by the BackgroundService

What could be the problem?

[ryanheise]

Hi @ReaganRealones

I would suggest filling in a bug report which would give me more information useful in tracking down the problem.

[duncan-iaria]

Hey @ReaganRealones

I was seeing a similar issue and the Background Service was immediately stopping. To solve it I followed the Android Setup section of the README including the optional step at the end (which I hadn't done previously). Also I had not added the shrinkResources false to the build.gradle file.

It seems to be working for me now, so it's worth a shot. Please note I added this package to an exiting project that was made before Flutter 1.12 so I also followed the notes on the new project template link in the README. I had done most of it, but I doubled checked everything.

Hope this helps!

[ryanheise]

Hi @ReaganRealones , is your issue now resolved by following the Android Setup instructions?

[snaeji]

Not sure if it's relevant but i'm going to leave it here anyways.

When i run the example (newest from github), start playing audio and then press the stop button i get this message in the console:

W/FlutterJNI(23165): Tried to send a platform message response, but FlutterJNI was detached from native C++. Could not send. Response ID: 31

It could be related to this issue, but there is a difference with "Tried to send a platform message / Cannot execute operation:
https://github.com/flutter/flutter/issues/28651

There are mentions in the thread that this happens when destroying the flutter engine. Maybe this message should just be ignored?

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[itsatifsiddiqui]

facing the same issue.

In the background activity, onAddQueueItem,
after some items added I get this error and further execution is stopped.
sometimes it add more items and sometimes two or three before this error.

how can I modify MainActivity.kt file? @ryanheise

[snaeji]

@itsatifsiddiqui my guess is that your code is causing a crash or causing a call to completer.complete()

[NmC]

Same thing happening to me when i try to restart service after stop.

[ryanheise]

Hi everyone, the Flutter issue @snaeji referred to was updated a few days ago with some news that they may look into this soon. That issue also suggests this warning message can be ignored.

However, if you have found that audio_service stops functioning correctly after this warning message, I'll need you to fill in the bug report template which includes a link to your minimal reproduction project. Based on your minimal reproduction project, I may be able to implement a workaround in the meantime.

[itsatifsiddiqui]

@ryanheise Thank you for taking the time to reply.
But as descibed by @snaeji, it was due to the call to completer.complete() on start method.

[hacker1024]

I'm getting this in onStop also.

It looks like this merge in Flutter fixed the crashes, but I'm not sure why the logging is still being triggered - that could be an issue with this plugin.

https://github.com/flutter/engine/pull/8170/commits/867905095ed969413887ce14c5714c81d648c11a

[sarbazx]

I am also having this issue, is this fixed? after stopping service cannot play.

EDIT: adding _completer.complete() in onStop method solved the issue.

[mohammadne]

I'am also getting this error when I call onStop, then the app will freeze

W/FlutterJNI(28183): Tried to send a platform message response, but FlutterJNI was detached from native C++. Could not send. Response ID: 62

but the example is ok for me, so I believe something in my code went wrong

[ryanheise]

@mohammadne would you be able to share a reproduction project?

[mohammadne]

the issue was because of my wrong stream implementation :

  Rx.combineLatest2<List<Music>, List<MediaItem>, List<Music>>(
    _audioQueueSbj.stream,
    AudioService.queueStream,
    (queue, mediaItems) {
      if (mediaItems == null || mediaItems.isEmpty) _audioQueueSbj.add([]);
      return queue;
    },
  ).distinct();

this stream stucked into an infinite loop which was cause of freezing the application when I called onStop.
because of adding item to _audioQueueSbj inside of combineLatest2.
means this line : if (mediaItems == null || mediaItems.isEmpty) _audioQueueSbj.add([]);

but still I have the FlutterJNI was detached from native C++ log both in example and my projects.
there's no crash or freezing, but I will see that with different IDs like : 62, 51 and ...

[ryanheise]

I suspected it could be something like that. But regarding the JNI message (which should be harmless), hopefully this warning will disappear once moving to the one-isolate branch.