bug(iOS): crash with space is in source url

[pishguy]

when i try to play audio i get this error and that cause crashing application:

Fatal error: Unexpectedly found nil while unwrapping an Optional value: file audioplayers/SwiftAudioplayersPlugin.swift, line 518

[LiJinJinJIn]

+1

[luanpotter]

that file goes up to line 518, so I don't think that error is possible. probably using an outdated version? can you please try on the latest version?

[mcradha]

I faced this same error 'Unexpectedly found nil while unwrapping an Optional value' on iOS. The application crashes giving this same error when I start the app and it tries to resume the background music if the sound setting is set to 'on'.

The app does not crash in Android but in Android also I do get an error and this is the stack trace:

Error log

[ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: PlatformException(Unexpected error!, uriString, java.lang.NullPointerException: uriString
E/flutter ( 6132): at android.net.Uri$StringUri.(Uri.java:496)
E/flutter ( 6132): at android.net.Uri$StringUri.(Uri.java:486)
E/flutter ( 6132): at android.net.Uri.parse(Uri.java:458)
E/flutter ( 6132): at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1169)
E/flutter ( 6132): at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1162)
E/flutter ( 6132): at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1127)
E/flutter ( 6132): at xyz.luan.audioplayers.WrappedMediaPlayer.setSource(WrappedMediaPlayer.java:422)
E/flutter ( 6132): at xyz.luan.audioplayers.WrappedMediaPlayer.actuallyPlay(WrappedMediaPlayer.java:265)
E/flutter ( 6132): at xyz.luan.audioplayers.WrappedMediaPlayer.play(WrappedMediaPlayer.java:252)
E/flutter ( 6132): at xyz.luan.audioplayers.AudioplayersPlugin.handleMethodCall(AudioplayersPlugin.java:111)
E/flutter ( 6132): at xyz.luan.audioplayers.AudioplayersPlugin.onMethodCall(AudioplayersPlugin.java:60)
E/flutter ( 6132): at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:233)
E/flutter ( 6132): at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:85)
E/flutter ( 6132): at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:692)
E/flutter ( 6132): at android.os.MessageQueue.nativePollOnce(Native Method)
E/flutter ( 6132): at android.os.MessageQueue.next(MessageQueue.java:335)
E/flutter ( 6132): at android.os.Looper.loop(Looper.java:183)
E/flutter ( 6132): at android.app.ActivityThread.main(ActivityThread.java:7656)
E/flutter ( 6132): at java.lang.reflect.Method.invoke(Native Method)
E/flutter ( 6132): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
E/flutter ( 6132): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
E/flutter ( 6132): , null)
E/flutter ( 6132): #0 StandardMethodCodec.decodeEnvelope
package:flutter/…/services/message_codecs.dart:582
E/flutter ( 6132): #1 MethodChannel._invokeMethod
package:flutter/…/services/platform_channel.dart:159
E/flutter ( 6132):
E/flutter ( 6132): #2 MethodChannel.invokeMethod
package:flutter/…/services/platform_channel.dart:332
E/flutter ( 6132): #3 AudioPlayer._invokeMethod
package:audioplayers/audioplayers.dart:337
E/flutter ( 6132): #4 AudioPlayer.resume
package:audioplayers/audioplayers.dart:491
E/flutter ( 6132): #5 Score.resumeBGMusic
package:JW/providers/score.dart:238
E/flutter ( 6132): #6 Score.updateSoundChoice
package:JW/providers/score.dart:65
E/flutter ( 6132): #7 _HomeScreenState.initParams
package:JW/screens/homeScreen.dart:88
E/flutter ( 6132): #8 _rootRunUnary (dart:async/zone.dart:1198:47)
E/flutter ( 6132): #9 _CustomZone.runUnary (dart:async/zone.dart:1100:19)
E/flutter ( 6132): #10 _FutureListener.handleValue (dart:async/future_impl.dart:143:18)
E/flutter ( 6132): #11 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:696:45)
E/flutter ( 6132): #12 Future._propagateToListeners (dart:async/future_impl.dart:725:32)
E/flutter ( 6132): #13 Future._completeWithValue (dart:async/future_impl.dart:529:5)
E/flutter ( 6132): #14 Future._asyncCompleteWithValue. (dart:async/future_impl.dart:567:7)
E/flutter ( 6132): #15 _rootRun (dart:async/zone.dart:1190:13)
E/flutter ( 6132): #16 _CustomZone.run (dart:async/zone.dart:1093:19)
E/flutter ( 6132): #17 _CustomZone.runGuarded (dart:async/zone.dart:997:7)
E/flutter ( 6132): #18 _CustomZone.bindCallbackGuarded. (dart:async/zone.dart:1037:23)
E/flutter ( 6132): #19 _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
E/flutter ( 6132): #20 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)

Here are the details of my Dart code:

class Score with ChangeNotifier {
  bool _soundsOn = true;
  
  final AudioPlayer advancedPlayer =
      new AudioPlayer(playerId: 'bgm_player', mode: PlayerMode.MEDIA_PLAYER)
        ..setReleaseMode(ReleaseMode.LOOP);

This function is called after reading the settings from local storage (if sounds are set to 'on' or 'off')

void updateSoundChoice(bool value) {
    _soundsOn = value;

    if (_soundsOn == false)
      pauseBGMusic();
    else
      resumeBGMusic();
}

Future<void> pauseBGMusic() async {
    int result = await advancedPlayer.pause();
    if (result != 1) print('Error pausing music');
  }

  Future<void> resumeBGMusic() async {
    advancedPlayer.setReleaseMode(ReleaseMode.LOOP);
    int result = await advancedPlayer.resume();
    if (result != 1) print('Error resuming music');
  }

I also have a function to load the background music of the app first time the app starts which is as below:

Future<void> loadBackgroundMusic() async {
    final String bgmusic =
        'https://xxxxxxxxx.com/sounds/background+music.mp3';
    if (_soundsOn == true) {
      await advancedPlayer.play(bgmusic, isLocal: false, volume: 0.3);
      advancedPlayer.onPlayerStateChanged.listen((AudioPlayerState state) {
        if (state == AudioPlayerState.COMPLETED) {
          advancedPlayer.play(bgmusic, isLocal: false, volume: 0.2);
        }
      });
    }

these errors are coming with audioplayers 0.17.1 in pubspec.yaml. I tried upgrading to audioplayers 0.18.0 but that requires minsdkversion to be 23 and my current minsdkversion is 19. changing that has impacts on other supported plugins in the app so its not my preferred choice.

Any suggestions on what I might be doing wrong?

[zsmiklos]

I got similar bug on iOS:
Fatal error: Unexpectedly found nil while unwrapping an Optional value: file audioplayers/WrappedMediaPlayer.swift, line 217
I can not play any file from internet on iOS. Could you fix it?

[usamaaelgendy]

same error

[umuieme]

Same error. For me, the error is because of space in the url of file. try to encode the url before sending it
Uri.encodeFull(url)

Maybe we can handle it in ios side in the library itself?

[pishguy]

+1

[dariocavada]

Uri.encodeFull

Solved using:

final result = await _audioPlayer.play(Uri.encodeFull(url), position: playPosition);

thank you to @umuieme

[alfianhpratama]

+1

[LeoSandbox]

I am experiencing the same issue. Is there a workaround besides renaming all filenames to remove spaces?