flutter: Change audioplayers to just_audio

Because of following audioplayers exception:

Error: PlatformException(Unexpected error!, null, java.lang.IllegalStateException at android.media.MediaPlayer._setDataSource(Native Method)
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1305)
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1288)
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1242)
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1218)
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1185)
at xyz.luan.audioplayers.WrappedMediaPlayer.setUrl(WrappedMediaPlayer.kt:37)
at xyz.luan.audioplayers.AudioplayersPlugin.handleMethodCall(AudioplayersPlugin.kt:62)
at xyz.luan.audioplayers.AudioplayersPlugin.onMethodCall(AudioplayersPlugin.kt:37)
at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:233)
at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:85)
at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:818)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:332)
at android.os.Looper.loop(Looper.java:168)
at android.app.ActivityThread.main(ActivityThread.java:6878)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:876) , null)

And remove BGM Settings.

Stack trace:
package:flutter/src/services/message_codecs.dart 581:7
StandardMethodCodec.decodeEnvelope package:flutter/src/services/platform_channel.dart 158:18
MethodChannel._invokeMethod
===== asynchronous gap ===========================
dart:async/zone.dart 1294:19
_CustomZone.registerBinaryCallback dart:async-patch/async_patch.dart 51:8
_asyncErrorWrapperHelper package:sanmill/services/audios.dart 79:19
Audios.playTone. package:stack_trace/src/chain.dart 94:24
Chain.capture. dart:async/zone.dart 1354:13 _rootRun dart:async/zone.dart 1258:19
_CustomZone.run dart:async/zone.dart 1789:10 _runZoned dart:async/zone.dart 1711:10
runZoned package:stack_trace/src/chain.dart 92:12 Chain.capture package:sanmill/services/audios.dart 78:11
Audios.playTone

src/ui/flutter_app/lib/services/audios.dart

@@ -18,27 +18,12 @@
 
 import 'dart:io';
 
-import 'package:audioplayers/audio_cache.dart';
-import 'package:audioplayers/audioplayers.dart';
+import 'package:just_audio/just_audio.dart';
 import 'package:sanmill/common/config.dart';
-import 'package:stack_trace/stack_trace.dart';
 
 class Audios {
   //
-  static AudioPlayer _fixedBgmPlayer, _fixedTonePlayer;
-  static AudioCache _bgmPlayer, _tonePlayer;
-
-  static loopBgm(String fileName) async {
-    if (_bgmPlayer == null) {
-      _fixedBgmPlayer = AudioPlayer();
-      _bgmPlayer = AudioCache(prefix: 'audios/', fixedPlayer: _fixedBgmPlayer);
-
-      //await _bgmPlayer.loadAll(['bg_music.mp3']);
-    }
-
-    _fixedBgmPlayer.stop();
-    _bgmPlayer.loop(fileName);
-  }
+  static AudioPlayer _player;
 
   static playTone(String fileName) async {
     if (!Config.toneEnabled) {
@@ -47,49 +32,45 @@ class Audios {
 
     if (Platform.isWindows) {
       print(
-          "audioplayers is not support Windows. See: https://pub.dev/packages/audioplayers");
+          "audio players is not support Windows. See: https://pub.dev/packages/just_audio");
       return;
     }
 
-    if (_tonePlayer == null) {
-      //
-      _fixedTonePlayer = AudioPlayer();
-      _tonePlayer =
-          AudioCache(prefix: 'assets/audios/', fixedPlayer: _fixedTonePlayer);
+    try {
+      if (_player == null) {
+        _player = AudioPlayer();
+      }
 
-      await _tonePlayer.loadAll([
-        'draw.mp3',
-        'go.mp3',
-        'illegal.mp3',
-        'mill.mp3',
-        'fly.mp3',
-        'lose.mp3',
-        'place.mp3',
-        'remove.mp3',
-        'select.mp3',
-        'win.mp3',
-      ]);
+      await _player.pause();
+      await _player.seek(Duration.zero);
+
+      var duration = await _player.setAsset("assets/audios/" + fileName);
+
+      _player.play();
+    } on PlayerException catch (e) {
+      // iOS/macOS: maps to NSError.code
+      // Android: maps to ExoPlayerException.type
+      // Web: maps to MediaError.code
+      print("Error code: ${e.code}");
+      // iOS/macOS: maps to NSError.localizedDescription
+      // Android: maps to ExoPlaybackException.getMessage()
+      // Web: a generic message
+      print("Error message: ${e.message}");
+    } on PlayerInterruptedException catch (e) {
+      // This call was interrupted since another audio source was loaded or the
+      // player was stopped or disposed before this audio source could complete
+      // loading.
+      print("Connection aborted: ${e.message}");
+    } catch (e) {
+      // Fallback for all errors
+      print(e);
     }
-
-    //await _fixedTonePlayer.stop();
-    await _fixedTonePlayer.pause();
-    await _fixedTonePlayer.seek(Duration.zero);
-    //await release();
-    Chain.capture(() {
-      _tonePlayer.play(fileName);
-    });
-  }
-
-  static stopBgm() {
-    if (_fixedBgmPlayer != null) _fixedBgmPlayer.stop();
   }
 
   static Future<void> release() async {
-    if (_fixedBgmPlayer != null) {
-      await _fixedBgmPlayer.release();
-    }
-    if (_fixedTonePlayer != null) {
-      await _fixedTonePlayer.release();
+    if (_player != null) {
+      await _player.stop();
+      await _player.dispose();
     }
   }
 }

src/ui/flutter_app/lib/widgets/game_settings_page.dart

@@ -20,7 +20,6 @@ import 'package:flutter/material.dart';
 import 'package:flutter_colorpicker/flutter_colorpicker.dart';
 import 'package:sanmill/common/config.dart';
 import 'package:sanmill/generated/l10n.dart';
-import 'package:sanmill/services/audios.dart';
 import 'package:sanmill/style/colors.dart';
 
 class GameSettingsPage extends StatefulWidget {
@@ -263,21 +262,6 @@ class _GameSettingsPageState extends State<GameSettingsPage> {
     Config.save();
   }
 
-  setMusic(bool value) async {
-    //
-    setState(() {
-      Config.bgmEnabled = value;
-    });
-
-    if (Config.bgmEnabled) {
-      //Audios.loopBgm('bg_music.mp3');
-    } else {
-      Audios.stopBgm();
-    }
-
-    Config.save();
-  }
-
   setTone(bool value) async {
     //
     setState(() {
@@ -338,13 +322,6 @@ class _GameSettingsPageState extends State<GameSettingsPage> {
               margin: const EdgeInsets.symmetric(vertical: 10),
               child: Column(
                 children: <Widget>[
-                  SwitchListTile(
-                    activeColor: UIColors.primaryColor,
-                    value: Config.bgmEnabled,
-                    title: Text(S.of(context).sound, style: itemStyle),
-                    onChanged: setMusic,
-                  ),
-                  _buildDivider(),
                   SwitchListTile(
                     activeColor: UIColors.primaryColor,
                     value: Config.toneEnabled,

src/ui/flutter_app/pubspec.yaml

@@ -12,7 +12,7 @@ dependencies:
   flutter_localizations:
     sdk: flutter
   cupertino_icons: ^1.0.0
-  audioplayers: ^0.17.4
+  just_audio: ^0.6.14+1
   path_provider: ^1.6.27
   package_info: ^0.4.3+4
   uuid: ^2.2.2