PlatformException on setUrl method call

[maxsalo17]

When i call setUrl method, i have "PlatformException (PlatformException(Error: java.lang.NullPointerException: Attempt to invoke virtual method 'long java.lang.Long.longValue()' on a null object reference"

My player class:
`import 'package:just_audio/just_audio.dart';

class RadioAudioPlayer {
AudioPlayer player;
static final RadioAudioPlayer _instance = RadioAudioPlayer._internal();

factory RadioAudioPlayer() {
return _instance;
}

RadioAudioPlayer._internal();

initialize(){
player = AudioPlayer();
}

playFromUrl(url)async{
await player?.setUrl(url);
player?.play();
}

stop() async {
await player?.stop();
}

}`

[ryanheise]

Can you share stack trace from the logcat logs? That will tell me what line number the exception occurred on.

[ryanheise]

I have just done a major re-implementation so whatever bug you encountered might be gone. Can you please try it and let me know (including stack traces) if you still get an error.

[maxsalo17]

Stacktrace from logcat:

`2019-12-31 16:28:52.486 14407-14407/org.rfnd.transistor.radio.app E/AccessibilityBridge: VirtualView node must not be the root node.
2019-12-31 16:28:52.785 14407-14407/org.rfnd.transistor.radio.app E/AccessibilityBridge: VirtualView node must not be the root node.
2019-12-31 16:28:53.887 14407-16283/org.rfnd.transistor.radio.app I/NuMediaExtractor: [setDataSource]line:83 setDataSource(http://online.1043.com.ua:8000/1043fm?type=.mp3/;stream.mp3)
2019-12-31 16:28:53.912 14407-14407/org.rfnd.transistor.radio.app E/AccessibilityBridge: VirtualView node must not be the root node.
2019-12-31 16:28:53.922 14407-16283/org.rfnd.transistor.radio.app I/MediaHTTP: user-agent:stagefright/1.2 (Linux;Android 7.0)
2019-12-31 16:28:53.942 14407-16283/org.rfnd.transistor.radio.app I/NuCachedSource2: lowwater = 4194304 bytes, highwater = 20971520 bytes, keepalive = 15000000 us
2019-12-31 16:28:54.029 14407-16287/org.rfnd.transistor.radio.app I/NuCachedSource2: [fetchInternal]line:345 fetchInternal, at 0 + 0
2019-12-31 16:28:54.049 14407-16283/org.rfnd.transistor.radio.app E/WVMExtractor: Failed to open libwvm.so: dlopen failed: library "libwvm.so" not found
2019-12-31 16:28:54.307 14407-16287/org.rfnd.transistor.radio.app I/System.out: [socket][1] connection online.1043.com.ua/194.135.81.16:8000;LocalPort=-1(30000)
2019-12-31 16:28:54.372 14407-16287/org.rfnd.transistor.radio.app I/System.out: [socket][/10.100.114.184:55607] connected
2019-12-31 16:28:54.374 14407-16287/org.rfnd.transistor.radio.app I/System.out: [OkHttp] sendRequest>>
2019-12-31 16:28:54.376 14407-16287/org.rfnd.transistor.radio.app I/System.out: [OkHttp] sendRequest<<
2019-12-31 16:28:55.215 14407-16287/org.rfnd.transistor.radio.app I/NuCachedSource2: bandwidth = 0 bytes/s
2019-12-31 16:28:55.216 14407-16287/org.rfnd.transistor.radio.app I/NuCachedSource2: [fetchInternal]line:345 fetchInternal, at 0 + 65536
2019-12-31 16:28:55.219 14407-16283/org.rfnd.transistor.radio.app I/NuCachedSource2: [readAt]line:606 ---Cache (1) is shot again, result = 8192 ---
2019-12-31 16:28:58.890 14407-16287/org.rfnd.transistor.radio.app I/NuCachedSource2: bandwidth = 27083 bytes/s
2019-12-31 16:28:58.893 14407-16287/org.rfnd.transistor.radio.app I/NuCachedSource2: [fetchInternal]line:345 fetchInternal, at 0 + 131072
2019-12-31 16:28:58.893 14407-16283/org.rfnd.transistor.radio.app I/NuCachedSource2: [readAt]line:606 ---Cache (2) is shot again, result = 8192 ---
2019-12-31 16:29:02.949 14407-16287/org.rfnd.transistor.radio.app I/NuCachedSource2: bandwidth = 22103 bytes/s
2019-12-31 16:29:02.949 14407-16287/org.rfnd.transistor.radio.app I/NuCachedSource2: [fetchInternal]line:345 fetchInternal, at 0 + 196608
2019-12-31 16:29:02.950 14407-16283/org.rfnd.transistor.radio.app I/NuCachedSource2: [readAt]line:606 ---Cache (3) is shot again, result = 8192 ---
2019-12-31 16:29:03.038 14407-16283/org.rfnd.transistor.radio.app I/NuMediaExtractor: [selectTrack]line:320 index:0
2019-12-31 16:29:03.050 14407-16283/org.rfnd.transistor.radio.app W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'long java.lang.Long.longValue()' on a null object reference
2019-12-31 16:29:03.050 14407-16283/org.rfnd.transistor.radio.app W/System.err: at android.media.MediaFormat.getLong(MediaFormat.java:794)
2019-12-31 16:29:03.050 14407-16283/org.rfnd.transistor.radio.app W/System.err: at com.ryanheise.just_audio.AudioPlayer.blockingInitExtractorAndCodec(AudioPlayer.java:379)
2019-12-31 16:29:03.050 14407-16283/org.rfnd.transistor.radio.app W/System.err: at com.ryanheise.just_audio.AudioPlayer.lambda$setUrl$2$AudioPlayer(AudioPlayer.java:213)
2019-12-31 16:29:03.051 14407-16283/org.rfnd.transistor.radio.app W/System.err: at com.ryanheise.just_audio.-$$Lambda$AudioPlayer$WoHp8OTkJ2aXGrdSEBMGAV0jQUE.run(lambda)
2019-12-31 16:29:03.051 14407-16283/org.rfnd.transistor.radio.app W/System.err: at java.lang.Thread.run(Thread.java:761)
2019-12-31 16:29:03.122 14407-14443/org.rfnd.transistor.radio.app E/flutter: [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: PlatformException(Error: java.lang.NullPointerException: Attempt to invoke virtual method 'long java.lang.Long.longValue()' on a null object reference, null, null)
#0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:569:7)
#1 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:321:33)

#2 AudioPlayer._invokeMethod (package:just_audio/just_audio.dart:256:24)

#3 AudioPlayer.setUrl (package:just_audio/just_audio.dart:140:9)
#4 RadioAudioPlayer.playFromUrl (package:transistor/tools/audioPlayer.dart:23:22)
#5 RadioListBloc.playAudio (package:transistor/bloc/radioListBloc.dart:59:12)
#6 RadioListBloc.onAutoplay (package:transistor/bloc/radioListBloc.dart:54:12)
#7 RenderToggleable._handleTap (package:flutter/src/material/toggleable.dart:425:9)
#8 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)
#9 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:486:11)
#10 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:264:5)
#11 BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:236:7)
#12 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
#13 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:222:20)
#14 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:198:22)
#15 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:156:7)
#16 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:102:7)
#17 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:86:7)
#18 _rootRunUnary (dart:async/zone.dart:1138:13)
#19 _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#20 _CustomZone.runUnaryGuarded (dart:async/zone.dart:933:7)
#21 _invoke1 (dart:ui/hooks.dart:273:10)
#22 _dispatchPointerDataPacket (dart:ui/hooks.dart:182:5)

`

[ryanheise]

Sorry I should have clarified that the new code is committed to git but not yet published to pub.dev until it's been tested, so to try it you would have to clone the repo.

[maxsalo17]

Ok, I`ll try

[maxsalo17]

Now it works, thank you. Is there any tutorial how to use audio_service with just_audio?

[ryanheise]

After a little more testing of just_audio and after this latest version is published, I will then update the audio_service example to use it. Hopefully within the next day or two.

[maxsalo17]

@ryanheise, what about example?

[ryanheise]

Hi @maxsalo17

The example of audio_service has been updated now to use just_audio.

[github-actions]

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