java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()' on a null object reference

[sanxianlee]

AudioCache _tipsPlayer = AudioCache(prefix: 'audio/', fixedPlayer: _alarmPlayer);
static AudioPlayer _alarmPlayer = AudioPlayer(mode: PlayerMode.LOW_LATENCY);
bool _isAlarmOn = false;

// open alarm

  void actionAlarmOn () async {
    if(_alarmPlayer != null){
      int state = await _alarmPlayer.stop();
      if(state == 1) {
        _alarmPlayer = await audio.loop("alarm.mp3");
        setState(() => _isAlarmOn = true);
      }
    }else{
      _alarmPlayer = await audio.loop("alarm.mp3");
      setState(() => _isAlarmOn = true);
    }

    Timer(Duration(seconds: 5), () {
      if (mounted) actionAlarmOff();
    });
  }

// close alarm function

void actionAlarmOff () async {
  if(_alarmPlayer  != null) {
    int state = await _alarmPlayer.stop(); // Unhandled Exception: PlatformException(error, Unsupported value: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()' on a null object reference, null
    print("stop alarm：state：$state");
    if(state == 1){
      _alarmPlayer = null;
      setState(() => _isAlarmOn = false);
    }
  }
}

E/AudioplayersPlugin( 1861): Unexpected error!
E/AudioplayersPlugin( 1861): java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()' on a null object reference
E/AudioplayersPlugin( 1861): 	at xyz.luan.audioplayers.WrappedSoundPool.stop(WrappedSoundPool.java:65)
E/AudioplayersPlugin( 1861): 	at xyz.luan.audioplayers.AudioplayersPlugin.handleMethodCall(AudioplayersPlugin.java:78)
E/AudioplayersPlugin( 1861): 	at xyz.luan.audioplayers.AudioplayersPlugin.onMethodCall(AudioplayersPlugin.java:41)
E/AudioplayersPlugin( 1861): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:222)
E/AudioplayersPlugin( 1861): 	at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:96)
E/AudioplayersPlugin( 1861): 	at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:656)
E/AudioplayersPlugin( 1861): 	at android.os.MessageQueue.nativePollOnce(Native Method)
E/AudioplayersPlugin( 1861): 	at android.os.MessageQueue.next(MessageQueue.java:323)
E/AudioplayersPlugin( 1861): 	at android.os.Looper.loop(Looper.java:136)
E/AudioplayersPlugin( 1861): 	at android.app.ActivityThread.main(ActivityThread.java:6121)
E/AudioplayersPlugin( 1861): 	at java.lang.reflect.Method.invoke(Native Method)
E/AudioplayersPlugin( 1861): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
E/AudioplayersPlugin( 1861): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:795)
E/MethodChannel#xyz.luan/audioplayers( 1861): Failed to handle method call
E/MethodChannel#xyz.luan/audioplayers( 1861): java.lang.IllegalArgumentException: Unsupported value: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()' on a null object reference
E/MethodChannel#xyz.luan/audioplayers( 1861): 	at io.flutter.plugin.common.StandardMessageCodec.writeValue(StandardMessageCodec.java:294)
E/MethodChannel#xyz.luan/audioplayers( 1861): 	at io.flutter.plugin.common.StandardMethodCodec.encodeErrorEnvelope(StandardMethodCodec.java:70)
E/MethodChannel#xyz.luan/audioplayers( 1861): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler$1.error(MethodChannel.java:230)
E/MethodChannel#xyz.luan/audioplayers( 1861): 	at xyz.luan.audioplayers.AudioplayersPlugin.onMethodCall(AudioplayersPlugin.java:44)
E/MethodChannel#xyz.luan/audioplayers( 1861): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:222)
E/MethodChannel#xyz.luan/audioplayers( 1861): 	at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:96)
E/MethodChannel#xyz.luan/audioplayers( 1861): 	at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:656)
E/MethodChannel#xyz.luan/audioplayers( 1861): 	at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#xyz.luan/audioplayers( 1861): 	at android.os.MessageQueue.next(MessageQueue.java:323)
E/MethodChannel#xyz.luan/audioplayers( 1861): 	at android.os.Looper.loop(Looper.java:136)
E/MethodChannel#xyz.luan/audioplayers( 1861): 	at android.app.ActivityThread.main(ActivityThread.java:6121)
E/MethodChannel#xyz.luan/audioplayers( 1861): 	at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#xyz.luan/audioplayers( 1861): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
E/MethodChannel#xyz.luan/audioplayers( 1861): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:795)
E/flutter ( 1861): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: PlatformException(error, Unsupported value: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()' on a null object reference, null)
E/flutter ( 1861): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:569:7)
E/flutter ( 1861): #1      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:316:33)
E/flutter ( 1861): <asynchronous suspension>
E/flutter ( 1861): #2      AudioPlayer._invokeMethod (package:audioplayers/audioplayers.dart:211:10)
E/flutter ( 1861): #3      AudioPlayer.stop (package:audioplayers/audioplayers.dart:268:30)
E/flutter ( 1861): <asynchronous suspension>
E/flutter ( 1861): #4      _AutoModeState.actionAlarmOff (package:zhct/views/business/autoMode_page.dart:475:38)
E/flutter ( 1861): <asynchronous suspension>
E/flutter ( 1861): #5      _AutoModeState.actionAlarmOn.<anonymous closure> (package:zhct/views/business/autoMode_page.dart:468:20)
E/flutter ( 1861): #6      _rootRun (dart:async/zone.dart:1120:38)
E/flutter ( 1861): #7      _CustomZone.run (dart:async/zone.dart:1021:19)
E/flutter ( 1861): #8      _CustomZone.runGuarded (dart:async/zone.dart:923:7)
E/flutter ( 1861): #9      _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
E/flutter ( 1861): #10     _rootRun (dart:async/zone.dart:1124:13)
E/flutter ( 1861): #11     _CustomZone.run (dart:async/zone.dart:1021:19)
E/flutter ( 1861): #12     _CustomZone.bindCallback.<anonymous closure> (dart:async/zone.dart:947:23)
E/flutter ( 1861): #13     Timer._createTimer.<anonymous closure> (dart:async-patch/timer_patch.dart:21:15)
E/flutter ( 1861): #14     _Timer._runTimers (dart:isolate-patch/timer_impl.dart:382:19)
E/flutter ( 1861): #15     _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:416:5)
E/flutter ( 1861): #16     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:172:12)
E/flutter ( 1861): 

[sanxianlee]

thinks!

[mooreorless555]

I'm also having this issue! Any updates?

[Amberon]

Another example

E/AudioplayersPlugin(12635): Unexpected error!
E/AudioplayersPlugin(12635): java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()' on a null object reference
E/AudioplayersPlugin(12635): 	at xyz.luan.audioplayers.WrappedSoundPool.setVolume(WrappedSoundPool.java:186)
E/AudioplayersPlugin(12635): 	at xyz.luan.audioplayers.AudioplayersPlugin.handleMethodCall(AudioplayersPlugin.java:64)
E/AudioplayersPlugin(12635): 	at xyz.luan.audioplayers.AudioplayersPlugin.onMethodCall(AudioplayersPlugin.java:44)

[yourshinsuke]

: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()' on a null object reference

[pgainullin]

same thing happens to me but also preceded by:

E/AudioAttributes(20124): Invalid stream type -2147483648 for AudioAttributes
W/SoundPool(20124): App requested 100 channels

(from #335)

[erickzanardo]

Closing this due to reports of this being fixed on newer versions. Feel free to open a new issue in case of this still happening