Media Session Compat未在Pre-Lollipop上显示锁屏控件 [英] Media Session Compat not showing Lockscreen controls on Pre-Lollipop

问题描述

我正在使用AppCompat支持库修订版22中的MediaSessionCompat.在Lollipop上，我会收到通知&锁屏的背景也是专辑封面.一切都很棒.

I'm using MediaSessionCompat from AppCompat Support Library Revision 22. And on Lollipop I'm getting notification & also the background of lockscreen is the album art. And everything works cool.

在Pre-Lollipop设备上，锁定屏幕上的音乐控件完全不显示.这很奇怪我尝试了所有操作，但没有显示，甚至没有背景变化.

While on Pre-Lollipop devices, the music controls on lockscreen are not at all shown. It's weird & I tried everything but it doesn't show up, not even the background changes.

我希望有人可以解决此问题.

I hope someone has solution to this issue.

注意:RemoteControlClient曾经在Lollipop&奇巧

Note: RemoteControlClient used to work on Lollipop & KitKat

/**
 * Initializes the remote control client
 */
private void setupMediaSession() {
    /* Activate Audio Manager */
    mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
    mAudioManager.requestAudioFocus(mAudioFocusListener, AudioManager.STREAM_MUSIC,
            AudioManager.AUDIOFOCUS_GAIN);

    ComponentName mRemoteControlResponder = new ComponentName(getPackageName(),
            MediaButtonReceiver.class.getName());
    final Intent mediaButtonIntent = new Intent(Intent.ACTION_MEDIA_BUTTON);
    mediaButtonIntent.setComponent(mRemoteControlResponder);
    mMediaSessionCompat = new MediaSessionCompat(getApplication(), "JairSession", mRemoteControlResponder, null);
    mMediaSessionCompat.setFlags(MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS | MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS);
    PlaybackStateCompat playbackStateCompat = new PlaybackStateCompat.Builder()
            .setActions(
                    PlaybackStateCompat.ACTION_SEEK_TO |
                    PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS |
                    PlaybackStateCompat.ACTION_SKIP_TO_NEXT |
                    PlaybackStateCompat.ACTION_PLAY |
                    PlaybackStateCompat.ACTION_PAUSE |
                    PlaybackStateCompat.ACTION_STOP
            )
            .setState(
                    isPlaying() ? PlaybackStateCompat.STATE_PLAYING : PlaybackStateCompat.STATE_PAUSED,
                    getCurrentPosition(),
                    1.0f)
            .build();
    mMediaSessionCompat.setPlaybackState(playbackStateCompat);
    mMediaSessionCompat.setCallback(mMediaSessionCallback);
    mMediaSessionCompat.setSessionActivity(retrievePlaybackActions(5));
    mMediaSessionCompat.setActive(true);
    updateMediaSessionMetaData();
    mTransportController = mMediaSessionCompat.getController().getTransportControls();

---

这是updateMediaSessionMetaData():

/**
 * Updates the lockscreen controls, if enabled.
 */
private void updateMediaSessionMetaData() {
            MediaMetadataCompat.Builder builder = new MediaMetadataCompat.Builder();
            builder.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, getArtistName());
            builder.putString(MediaMetadataCompat.METADATA_KEY_ALBUM, getAlbumName());
            builder.putString(MediaMetadataCompat.METADATA_KEY_TITLE, getTrackName());
            builder.putLong(MediaMetadataCompat.METADATA_KEY_DURATION, getDuration());
            builder.putBitmap(MediaMetadataCompat.METADATA_KEY_ALBUM_ART, MusicUtils.getArtwork(this, getAlbumID(), true));
            mMediaSessionCompat.setMetadata(builder.build());

}

媒体会话回调方法

private final MediaSessionCompat.Callback mMediaSessionCallback = new MediaSessionCompat.Callback() {

    @Override
    public boolean onMediaButtonEvent(Intent mediaButtonEvent) {
        final String intentAction = mediaButtonEvent.getAction();
        if (AudioManager.ACTION_AUDIO_BECOMING_NOISY.equals(intentAction)) {
            if (PrefUtils.isHeadsetPause(getBaseContext())) {
                Log.d(LOG_TAG, "Headset disconnected");
                pause();
            }
        } else if (Intent.ACTION_MEDIA_BUTTON.equals(intentAction)) {
            final KeyEvent event = mediaButtonEvent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
            if (event == null) return super.onMediaButtonEvent(mediaButtonEvent);
            final int keycode = event.getKeyCode();
            final int action = event.getAction();
            final long eventTime = event.getEventTime();
            if (event.getRepeatCount() == 0 && action == KeyEvent.ACTION_DOWN) {
                switch (keycode) {
                    case KeyEvent.KEYCODE_HEADSETHOOK:
                        if (eventTime - mLastClickTime < DOUBLE_CLICK) {
                            playNext(mSongNumber);
                            mLastClickTime = 0;
                        } else {
                            if (isPlaying())
                                pause();
                            else resume();
                            mLastClickTime = eventTime;
                        }
                        break;
                    case KeyEvent.KEYCODE_MEDIA_STOP:
                        mTransportController.stop();
                        break;
                    case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
                        if (isMediaPlayerActive()) {
                            if (isPlaying()) mTransportController.pause();
                            else mTransportController.play();
                        }
                        break;
                    case KeyEvent.KEYCODE_MEDIA_NEXT:
                        mTransportController.skipToNext();
                        break;
                    case KeyEvent.KEYCODE_MEDIA_PREVIOUS:
                        mTransportController.skipToPrevious();
                        break;
                    case KeyEvent.KEYCODE_MEDIA_PAUSE:
                        mTransportController.pause();
                        break;
                    case KeyEvent.KEYCODE_MEDIA_PLAY:
                        mTransportController.play();
                        break;
                }
            }
        }
        return super.onMediaButtonEvent(mediaButtonEvent);
    }

    @Override
    public void onPlay() {
        super.onPlay();
        resume();
    }

    @Override
    public void onPause() {
        super.onPause();
        pause();
    }

    @Override
    public void onSkipToNext() {
        super.onSkipToNext();
        playNext(mSongNumber);
    }

    @Override
    public void onSkipToPrevious() {
        super.onSkipToPrevious();
        playPrevious(mSongNumber);
    }

    @Override
    public void onSeekTo(long pos) {
        super.onSeekTo(pos);
        seekTo(pos);
    }

    @Override
    public void onStop() {
        super.onStop();
        pause();
        commitMusicData();
        updatePlayingUI(STOP_ACTION);
        stopSelf();
    }
};

---

媒体按钮接收器清单条目

---

Media Button Receiver Manifest Entry

<!-- Media button receiver -->
    <receiver android:name=".receiver.MediaButtonReceiver" >
        <intent-filter>
            <action android:name="android.intent.action.MEDIA_BUTTON" />
            <action android:name="android.media.AUDIO_BECOMING_NOISY" />
        </intent-filter>
    </receiver>

---

几周以来，我一直在努力解决该问题，但没有成功，而且迫切需要帮助.

---

I'm trying since couple of weeks to solve this issue with no success, and in desperate need of help.

也可以使用MediaSessionCompat的教程或示例

A tutorial or example of MediaSessionCompat would also be fine

推荐答案

最后，我找到了解决方案.感谢 @ianhanniballake & @ user1549672

Finally I figured a solution for this. Thanks to @ianhanniballake & @user1549672

1. 按照音频焦点 ="https://stackoverflow.com/users/1676363/ianhanniballake"> @ianhanniballake
如果在Google&上搜索到
2. 添加音乐意图BroadcastReceiver，则可以找到.也在官方Android文档上
3. 写下上面我的问题中给出的setupMediaSession()
4. 非常重要正确地提及了Flags
5. 写MediaSessionCallbacks也在上方
6. 非常重要更新MediaPlayer#onPause()，MediaPlayer#onStart()和MediaSession上的MediaSession最后，当播放由 @ user1549672
提到的新歌曲(还包括下一首和上一首歌曲)时
7. 释放onDestory()
中的MediaSession对象

1. Add Audio Focus as suggested by @ianhanniballake
2. Add Music Intent BroadcastReceiver can be found if searched on Google & also on Official Android Docs
3. Write the setupMediaSession() given in my question above
4. VERY IMPORTANT Mention the Flags properly
5. Write MediaSessionCallbacks also available above
6. VERY IMPORTANT Update the MediaSession on MediaPlayer#onPause(), MediaPlayer#onStart() & finally when new song is played (also includes next & previous played) mentioned by @user1549672
7. Release the MediaSession object in onDestory()

仅此而已，大部分材料(代码)都在上面.这个问题花了几个月的时间解决，终于解决了.

Well that's all, most of the material (code) is available above. This question took couple of months to solve, finally it's done.

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