启动时Android崩溃 - MediaButtonReceiver可能不为null

Question

我在我的Unity应用程序中遇到了一个问题,Android构建在运行Android 4.3的设备上启动时崩溃该应用程序加载了我在后台播放音乐而应用程序暂停时编写的本机插件.它正在使用Android MediaBrowser API,因此我使用的是"Compat"版本,因此请继续支持以前版本的Android.

06-07 09:59:37.000: E/AndroidRuntime(1748): FATAL EXCEPTION: main
06-07 09:59:37.000: E/AndroidRuntime(1748): java.lang.Error: FATAL EXCEPTION [main]
06-07 09:59:37.000: E/AndroidRuntime(1748): Unity version     : 5.6.1f1
06-07 09:59:37.000: E/AndroidRuntime(1748): Device model      : samsung GT-I9300
06-07 09:59:37.000: E/AndroidRuntime(1748): Device fingerprint: samsung/m0xx/m0:4.3/JSS15J/I9300XXUGMK6:user/release-keys
06-07 09:59:37.000: E/AndroidRuntime(1748): Caused by: java.lang.RuntimeException: Unable to create service com.help.stressfree.mediabrowser.MusicService: java.lang.IllegalArgumentException: MediaButtonReceiver component may not be null.
06-07 09:59:37.000: E/AndroidRuntime(1748):     at android.app.ActivityThread.handleCreateService(ActivityThread.java:2697)
06-07 09:59:37.000: E/AndroidRuntime(1748):     at android.app.ActivityThread.access$1700(ActivityThread.java:159)
06-07 09:59:37.000: E/AndroidRuntime(1748):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1404)
06-07 09:59:37.000: E/AndroidRuntime(1748):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-07 09:59:37.000: E/AndroidRuntime(1748):     at android.os.Looper.loop(Looper.java:176)
06-07 09:59:37.000: E/AndroidRuntime(1748):     at android.app.ActivityThread.main(ActivityThread.java:5419)
06-07 09:59:37.000: E/AndroidRuntime(1748):     at java.lang.reflect.Method.invokeNative(Native Method)
06-07 09:59:37.000: E/AndroidRuntime(1748):     at java.lang.reflect.Method.invoke(Method.java:525)
06-07 09:59:37.000: E/AndroidRuntime(1748):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
06-07 09:59:37.000: E/AndroidRuntime(1748):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
06-07 09:59:37.000: E/AndroidRuntime(1748):     at dalvik.system.NativeStart.main(Native Method)
06-07 09:59:37.000: E/AndroidRuntime(1748): Caused by: java.lang.IllegalArgumentException: MediaButtonReceiver component may not be null.
06-07 09:59:37.000: E/AndroidRuntime(1748):     at android.support.v4.media.session.MediaSessionCompat$MediaSessionImplBase.<init>(MediaSessionCompat.java:1054)
06-07 09:59:37.000: E/AndroidRuntime(1748):     at android.support.v4.media.session.MediaSessionCompat.<init>(MediaSessionCompat.java:176)
06-07 09:59:37.000: E/AndroidRuntime(1748):     at android.support.v4.media.session.MediaSessionCompat.<init>(MediaSessionCompat.java:118)
06-07 09:59:37.000: E/AndroidRuntime(1748):     at com.help.stressfree.mediabrowser.MusicService.onCreate(MusicService.java:169)
06-07 09:59:37.000: E/AndroidRuntime(1748):     at android.app.ActivityThread.handleCreateService(ActivityThread.java:2687)
06-07 09:59:37.000: E/AndroidRuntime(1748):     ... 10 more

我的重写Unity活动在onCreate中有这个

protected void onCreate(Bundle savedInstanceState) {

        // call UnityPlayerActivity.onCreate()
        super.onCreate(savedInstanceState);

        Instance = this;

        LogHelper.d(TAG, "ThriveUnityPlayerActivity.onCreate");

        //Intent intent = new Intent(this, MusicPlayerActivity.class);
        //startActivity(intent);

        Intent intent = new Intent(this, MusicService.class);
        startService(intent);
    }

我的MusicService类具有以下onCreate函数

@Override
     public void onCreate() {
         super.onCreate();
         LogHelper.d(TAG, "onCreate");

         //mPlayingQueue = new ArrayList<>();
         //mMusicProvider = new MusicProvider();
         //mPackageValidator = new PackageValidator(this);

         mMyServiceHandler = new Handler()
         {
             //here we will receive messages from activity(using sendMessage() from activity)
             public void handleMessage(Message msg)
             {
                 LogHelper.i(TAG,"handleMessage(Message msg)" );
                 switch(msg.what)
                 {
                     case 0:
                         PlayTrackByName((String) msg.obj);

                         break;

                     default:
                         break;
                 }
             }
         };

         // Start a new MediaSession
         mSession = new MediaSessionCompat(this, "MusicService");
         setSessionToken(mSession.getSessionToken());
         mSession.setCallback(new MediaSessionCallback());
         mSession.setFlags(MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS |
             MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS);

         mPlayback = new Playback(this/*, mMusicProvider*/);
         mPlayback.setState(PlaybackStateCompat.STATE_NONE);
         mPlayback.setCallback(this);
         mPlayback.start();

         Context context = getApplicationContext();
         Intent intent = new Intent(context, MusicPlayerActivity.class);
         PendingIntent pi = PendingIntent.getActivity(context, 99 /*request code*/,
                 intent, PendingIntent.FLAG_UPDATE_CURRENT);
         mSession.setSessionActivity(pi);

         Bundle extras = new Bundle();
         //CarHelper.setSlotReservationFlags(extras, true, true, true);
         mSession.setExtras(extras);

         updatePlaybackState(null);

         mMediaNotificationManager = new MediaNotificationManager(this);
     }

有谁知道崩溃意味着什么以及我将如何修复它？

Answer 1

尝试在控制我经历此运行4.4的媒体的活动下的清单中添加媒体按钮接收器,但不是在更高版本上.

<receiver android:name="android.support.v4.media.session.MediaButtonReceiver" >
<intent-filter>
  <action android:name="android.intent.action.MEDIA_BUTTON" />
</intent-filter>
</receiver>

并阅读; 媒体按钮接收器