10000 Unable to getUserMedia: Attempt to invoke virtual method 'android.content.Intent android.app.Activity.registerReceiver(android.content.BroadcastReceiver, android.content.IntentFilter)' on a null object reference · Issue #1799 · flutter-webrtc/flutter-webrtc · GitHub
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Unable to getUserMedia: Attempt to invoke virtual method 'android.content.Intent android.app.Activity.registerReceiver(android.content.BroadcastReceiver, android.content.IntentFilter)' on a null object reference #1799

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devKaran-coder opened this issue Mar 25, 2025 · 2 comments
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Unable to getUserMedia: Attempt to invoke virtual method 'android.content.Intent android.app.Activity.registerReceiver(android.content.BroadcastReceiver, android.content.IntentFilter)' on a null object reference #1799

devKaran-coder opened this issue Mar 25, 2025 · 2 comments

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@devKaran-coder
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I am using flutter_webrtc plugin from sip_ua with flutter_foreground_task in between when I call this function which is mention below I got this error

  • Flutter version: 3.29.0
  • Plugin version: flutter_webrtc-0.12.12+hotfix.1
  • OS: Android

_funcForCalling(String number) async {
try {
final mediaConstraints = <String, dynamic>{'audio': true, 'video': false};

webrtc.MediaStream mediaStream;

mediaConstraints['video'] = false;
mediaStream =
    await webrtc.navigator.mediaDevices.getUserMedia(mediaConstraints);

helper!.call(number, mediaStream: mediaStream);

} catch (e, s) {
print("error is $e");
print("stack stace is $s");
}
}

E/MethodChannel#FlutterWebRTC.Method(31010): Failed to handle method call
E/MethodChannel#FlutterWebRTC.Method(31010): java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Intent android.app.Activity.registerReceiver(android.content.BroadcastReceiver, android.content.IntentFilter)' on a null object reference
E/MethodChannel#FlutterWebRTC.Method(31010): at com.cloudwebrtc.webrtc.video.camera.DeviceOrientationManager.start(DeviceOrientationManager.java:57)
E/MethodChannel#FlutterWebRTC.Method(31010): at com.cloudwebrtc.webrtc.video.camera.CameraUtils.(CameraUtils.java:48)
E/MethodChannel#FlutterWebRTC.Method(31010): at com.cloudwebrtc.webrtc.MethodCallHandlerImpl.initialize(MethodCallHandlerImpl.java:176)
E/MethodChannel#FlutterWebRTC.Method(31010): at com.cloudwebrtc.webrtc.MethodCallHandlerImpl.onMethodCall(MethodCallHandlerImpl.java:345)
E/MethodChannel#FlutterWebRTC.Method(31010): at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:267)
E/MethodChannel#FlutterWebRTC.Method(31010): at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:292)
E/MethodChannel#FlutterWebRTC.Method(31010): at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:319)
E/MethodChannel#FlutterWebRTC.Method(31010): at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(D8$$SyntheticClass:0)
E/MethodChannel#FlutterWebRTC.Method(31010): at android.os.Handler.handleCallback(Handler.java:959)
E/MethodChannel#FlutterWebRTC.Method(31010): at android.os.Handler.dispatchMessage(Handler.java:100)
E/MethodChannel#FlutterWebRTC.Method(31010): at android.os.Looper.loopOnce(Looper.java:232)
E/MethodChannel#FlutterWebRTC.Method(31010): at android.os.Looper.loop(Looper.java:317)
E/MethodChannel#FlutterWebRTC.Method(31010): at android.app.ActivityThread.main(ActivityThread.java:8705)
E/MethodChannel#FlutterWebRTC.Method(31010): at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#FlutterWebRTC.Method(31010): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:580)
E/MethodChannel#FlutterWebRTC.Method(31010): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:886)
I/flutter (31010): error is Unable to getUserMedia: Attempt to invoke virtual method 'android.content.Intent android.app.Activity.registerReceiver(android.content.BroadcastReceiver, android.content.IntentFilter)' on a null object reference
I/flutter (31010): stack stace is #0 MediaDeviceNative.getUserMedia (package:flutter_webrtc/src/native/mediadevices_impl.dart:48:7)
I/flutter (31010):
I/flutter (31010): #1 CallTaskHandler._handleOutGoingCall (package:adit.app/utils/forground_service/call_task_handler.dart:864:11)
I/flutter (31010):

@harryandroiddev
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same issue

@viplifes viplifes mentioned this issue Apr 21, 2025
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@robsonvasquez
6EE8
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@devKaran-coder @harryandroiddev

I experienced this issue with getUserMedia only when trying to answer a call while the app was in the background.

Due to Apple’s requirement to update apps for iOS 18, I updated the libraries and noticed that WebRTC stopped working in the background on Android starting from version "12.0.0", resulting in the same error you're seeing.

If your app doesn’t have issues using an older WebRTC version on Android, I recommend using "0.10.8", which works.
You can also try up to version "0.11.7" — I haven’t tested that one myself.

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@robsonvasquez @harryandroiddev @devKaran-coder
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