服务不接收多媒体按钮点击事件

Question

我正在制作一个应用程序，当我按下多媒体按钮时它应该做一些事情。我知道我必须创建一个服务并捕获那里的所有事件。我按照文档中的建议进行了所有操作，但我仍然没有在应用程序中收到点击事件。

我在编写类似应用程序时遵循了以下准则： https://developer.android.com/guide/topics/media-apps/mediabuttons https://developer.android.com/reference/androidx/media/session/MediaButtonReceiver.html https://code.tutsplus.com/tutorials/create-a-music-player-on-android-song-playback--mobile-22778?_ga=2.241321730.1029380229.1566994251-780734199.1565702660 https://habr.com/ru/post/339416/ 但我仍然没有得到这个事件。我将所有代码放在存储库中： https://gitlab.com/ICaxapI/mediaretranslator/tree/master/app/src/main

和...以下是我已经遵循的一些建议：在 AndroidManifest ->

<receiver android:name="androidx.media.session.MediaButtonReceiver">
            <intent-filter>
                <action android:name="android.intent.action.MEDIA_BUTTON" />
            </intent-filter>
        </receiver>
...
        <service android:name="ru.exsoft.mediaretranslator.RetranslatorService">
            <intent-filter>
                <action android:name="android.intent.action.MEDIA_BUTTON" />
            </intent-filter>
        </service>

在服务中 class:

override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
        MediaButtonReceiver.handleIntent(mediaSession, intent)
        return START_STICKY
    }

 override fun onCreate() {
        val stateBuilder: Builder = Builder().setActions(ACTION_PLAY or ACTION_STOP or ACTION_PAUSE or ACTION_PLAY_PAUSE or ACTION_SKIP_TO_NEXT or ACTION_SKIP_TO_PREVIOUS)
        ...
        mediaSession!!.setCallback(mediaSessionCallback)
        mediaSession!!.setFlags(MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS or MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS)
        val state =  PlaybackStateCompat.Builder().setActions(
            ACTION_PLAY or ACTION_PLAY_PAUSE or
                    ACTION_PLAY_FROM_MEDIA_ID or ACTION_PAUSE or
                    ACTION_SKIP_TO_NEXT or ACTION_SKIP_TO_PREVIOUS
        ).setState(STATE_PLAYING, 5, 1.0f, SystemClock.elapsedRealtime())
            .build()
        mediaSession?.setPlaybackState(state!!)
        mediaSession?.isActive = true
        ...
        val notificationBuilder = NotificationCompat.Builder(this, channelId )
        val notification = notificationBuilder.setOngoing(true)
            .setSmallIcon(R.mipmap.ic_launcher)
            .setPriority(PRIORITY_MAX)
            .setCategory(Notification.CATEGORY_SERVICE)
            .build()
        startForeground(1, notification)
    }

以及 GitLab 中的其他 https://gitlab.com/ICaxapI/mediaretranslator/tree/master/app/src/main

... 在 logcat 中，我看到以下几行，确认系统根本不认为我的 class 可以处理此事件。 :(

2019-08-29 14:08:44.122 23691-23691/? V/Avrcp_ext: recordKeyDispatched: KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_MEDIA_PAUSE, scanCode=0, metaState=0, flags=0x0, repeatCount=0, eventTime=508419172, downTime=508419172, deviceId=-1, source=0x0 } dispatched to com.vanced.android.youtube
2019-08-29 14:08:44.122 1675-2510/? D/MediaSessionService: Sending KeyEvent { action=ACTION_UP, keyCode=KEYCODE_MEDIA_PAUSE, scanCode=0, metaState=0, flags=0x0, repeatCount=0, eventTime=508419172, downTime=508419172, deviceId=-1, source=0x0 } to the last known PendingIntent PendingIntent{e2b4330: PendingIntentRecord{7ce4b98 com.vanced.android.youtube broadcastIntent}}

Answer 1

我运行遇到了类似的问题，根本原因是我的媒体会话没有播放音频。尝试在调用 mediaSession?.isActive = true

的行之后添加以下内容

        val dummyAudioTrack = AudioTrack(
             AudioManager.STREAM_MUSIC,
             48000,
             AudioFormat.CHANNEL_OUT_STEREO,
             AudioFormat.ENCODING_PCM_16BIT,
             AudioTrack.getMinBufferSize(
                  48000,
                  AudioFormat.CHANNEL_OUT_STEREO,
                  AudioFormat.ENCODING_PCM_16BIT
             ),
             AudioTrack.MODE_STREAM
         )

         dummyAudioTrack.play()

（注意，AudioTrack 已弃用，我只是还没找到首选方法）

服务不接收多媒体按钮点击事件

Service does not receive multimedia button click events

java

service

android

android-mediaplayer

kotlin