Fatal Exception

[incafox]

hi, i was trying to add your plugin to a new project in order to run the example, and i have this error:
(i modified the manifest and adding the MainApplication file)

D/AndroidRuntime( 5855): Shutting down VM
E/AndroidRuntime( 5855): FATAL EXCEPTION: main
E/AndroidRuntime( 5855): Process: com.ryanheise.audioserviceexample, PID: 5855
E/AndroidRuntime( 5855): java.lang.NullPointerException: Attempt to invoke interface method 'void io.flutter.plugin.common.PluginRegistry$PluginRegistrantCallback.registerWith(io.flutter.plugin.common.PluginRegistry)' on a null object reference
E/AndroidRuntime( 5855): at com.ryanheise.audioservice.AudioServicePlugin$ClientHandler$3.onPlay(AudioServicePlugin.java:218)
E/AndroidRuntime( 5855): at com.ryanheise.audioservice.AudioService$MediaSessionCallback$1.run(AudioService.java:396)
E/AndroidRuntime( 5855): at com.ryanheise.audioservice.AudioService$MediaSessionCallback.play(AudioService.java:411)
E/AndroidRuntime( 5855): at com.ryanheise.audioservice.AudioService$MediaSessionCallback.onPlay(AudioService.java:394)
E/AndroidRuntime( 5855): at android.support.v4.media.session.MediaSessionCompat$Callback$StubApi21.onPlay(MediaSessionCompat.java:1259)
E/AndroidRuntime( 5855): at android.support.v4.media.session.MediaSessionCompatApi21$CallbackProxy.onPlay(MediaSessionCompatApi21.java:194)
E/AndroidRuntime( 5855): at android.media.session.MediaSession$CallbackMessageHandler.handleMessage(MediaSession.java:1407)
E/AndroidRuntime( 5855): at android.os.Handler.dispatchMessage(Handler.java:106)
E/AndroidRuntime( 5855): at android.os.Looper.loop(Looper.java:164)
E/AndroidRuntime( 5855): at android.app.ActivityThread.main(ActivityThread.java:6494)
E/AndroidRuntime( 5855): at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime( 5855): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
E/AndroidRuntime( 5855): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

i cannot run the example,i can run it only openning the plugin project itself (but obviously that is not the way), what am i doing wrong?

[ryanheise]

Hi, the error points to line 218 of AudioServicePlugin.java:

	pluginRegistrantCallback.registerWith(backgroundFlutterView.getPluginRegistry());

so, most likely pluginRegistrantCallback is null. Can you check that you have set the pluginRegistrantCallback in your MainApplication class? (an example is on the README page)

[alexantenna]

I've stepped in similar problem myself. Default Flutter app structure doesn't include any custom MainApplication and not being Android developer before I've missed this light remark in the README. There are also a couple of other similar problems which I've finally solved by carefully investigated structure of the Example app and contents of all its files then copied the relevant parts to my app.

[incafox]

Hi, the error points to line 218 of AudioServicePlugin.java:

	pluginRegistrantCallback.registerWith(backgroundFlutterView.getPluginRegistry());

so, most likely pluginRegistrantCallback is null. Can you check that you have set the pluginRegistrantCallback in your MainApplication class? (an example is on the README page)

Thanks for the answer.
Yes i have set the pluginRegistrantCallback in my MainApplication like the README page, you can see that here :
https://github.com/incafox/audioserviceexample
I uploaded the entire example.
As @alexantenna said, i carefully investigated the structure of the example and i can't find the error, please help.

[alexantenna]

@incafox Looks like you didn't put reference to MainApplication to AndroidManifest.

The relevant part should look like:

<application
android:name=".MainApplication"
...

but you have reference to standard Flutter app (default value).

You should inspect manifest carefully as well :-) This was not easy for me!

P.S. Next hint - when your app starts partially working and you see the notification to see buttons icons you should copy files from src/res folder as well :-)

[incafox]

@incafox Looks like you didn't put reference to MainApplication to AndroidManifest.

The relevant part should look like:

<application
android:name=".MainApplication"
...

but you have reference to standard Flutter app (default value).

You should inspect manifest carefully as well :-) This was not easy for me!

P.S. Next hint - when your app starts partially working and you see the notification to see buttons icons you should copy files from src/res folder as well :-)

Thankyou!!! so much. :)

[github-actions]

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