On Android using camera plugin and audio recorder cause permission issue and crash for the first launch

[iNima]

Hi there,

I added the required permission in the AndroidManifest file but in my app I'm also using the camera plugin. So, as soon as the camera is initiated it askes two permissions. 1- access to camera 2- access to audio recording via mic

When I allow permission the app crashes. It happens even when I don't use flutter_audio_recorder at all, only adding the plugin in the pubspec.yaml is enough to see this exception when we allow permissions:

E/AndroidRuntime(17775): java.lang.RuntimeException: Failure delivering result ResultInfo{who=@android:requestPermissions:, request=9796, result=-1, data=Intent { act=android.content.pm.action.REQUEST_PERMISSIONS (has extras) }} to activity {....MainActivity}: java.lang.NullPointerException: Attempt to invoke interface method 'void io.flutter.plugin.common.MethodChannel$Result.success(java.lang.Object)' on a null object reference
E/AndroidRuntime(17775):    at android.app.ActivityThread.deliverResults(ActivityThread.java:4398)
E/AndroidRuntime(17775):    at android.app.ActivityThread.handleSendResult(ActivityThread.java:4440)
E/AndroidRuntime(17775):    at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:49)
E/AndroidRuntime(17775):    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
E/AndroidRuntime(17775):    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
E/AndroidRuntime(17775):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816)
E/AndroidRuntime(17775):    at android.os.Handler.dispatchMessage(Handler.java:106)
E/AndroidRuntime(17775):    at android.os.Looper.loop(Looper.java:193)
E/AndroidRuntime(17775):    at android.app.ActivityThread.main(ActivityThread.java:6718)
E/AndroidRuntime(17775):    at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(17775):    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
E/AndroidRuntime(17775):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
E/AndroidRuntime(17775): Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'void io.flutter.plugin.common.MethodChannel$Result.success(java.lang.Object)' on a null object reference
E/AndroidRuntime(17775):    at com.zeno.flutter_audio_recorder.FlutterAudioRecorderPlugin.onRequestPermissionsResult(FlutterAudioRecorderPlugin.java:82)
E/AndroidRuntime(17775):    at io.flutter.app.FlutterPluginRegistry.onRequestPermissionsResult(FlutterPluginRegistry.java:194)
E/AndroidRuntime(17775):    at io.flutter.app.FlutterActivityDelegate.onRequestPermissionsResult(FlutterActivityDelegate.java:127)
E/AndroidRuntime(17775):    at io.flutter.app.FlutterActivity.onRequestPermissionsResult(FlutterActivity.java:137)
E/AndroidRuntime(17775):    at android.app.Activity.dispatchRequestPermissionsResult(Activity.java:7616)
E/AndroidRuntime(17775):    at android.app.Activity.dispatchActivityResult(Activity.java:7466)
E/AndroidRuntime(17775):    at android.app.ActivityThread.deliverResults(ActivityThread.java:4391)
E/AndroidRuntime(17775):    ... 11 more

I don't know why the crash happens in com.zeno.flutter_audio_recorder.FlutterAudioRecorderPlugin.onRequestPermissionsResult(FlutterAudioRecorderPlugin.java:82) although I didn't even import it in my class file!

(It works correctly on iOS by the way)

[nikli2009]

Hi Nima, Thanks for reporting the issue, 0.5.4 should be ok.

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I don't know why the crash happens in com.zeno.flutter_audio_recorder.FlutterAudioRecorderPlugin.onRequestPermissionsResult(FlutterAudioRecorderPlugin.java:82) although I didn't even import it in my class file!

After done some troubleshooting, It's quite interesting that I found that Flutter will register all the plugins for us after we install any new plugins(even without use them like you mentioned in the first post). ( you could find the Registrant in ./Android/app/src/main/java/io.flutter.plugins/GeneratedPluginRegistrant).

And the permission result callback in Android was registered along with the plugin(but this situation was not handled correctly in 0.5.3), that's why this issue was introduced.

Thanks Nik

[iNima]

Thanks @nikli2009 At the moment I switched to another plugin because of supporting aac on Android. By the way, thanks for fixing this issue.