通过A2DP / AVRCP发送跟踪信息(send track informations via A

2019-07-22 03:49发布

我试图通过A2DP / AVRCP发送跟踪信息。 眼下,音乐是完全流,但在“接收器”(即:汽车音响),在“轨道信息屏幕”为空白(这是没有使用流行的球员那里的情况下)。 任何的想法 ?

Answer 1:

此代码为我工作:

private static final String AVRCP_PLAYSTATE_CHANGED = "com.android.music.playstatechanged";
private static final String AVRCP_META_CHANGED = "com.android.music.metachanged";

private void bluetoothNotifyChange(String what) {
    Intent i = new Intent(what);
    i.putExtra("id", Long.valueOf(getAudioId()));
    i.putExtra("artist", getArtistName());
    i.putExtra("album",getAlbumName());
    i.putExtra("track", getTrackName());
    i.putExtra("playing", isPlaying());        
    i.putExtra("ListSize", getQueue());
    i.putExtra("duration", duration());
    i.putExtra("position", position());
    sendBroadcast(i);
}

暂停/播放/元数据改变:与这取决于您的播放状态相应的意图(如上定义)调用bluetoothNotifyChange。



Answer 2:

如果你只是想从你的手机发送的元数据信息的连接AVRCP音频兼容的蓝牙设备, 希望在所有从蓝牙设备来控制你的应用程序,你会发现下面的有用的代码。 而且也没有必要实施并注册AudioManager一个MediaButtonEventReceiver。

我还包括用于API版本21(棒棒糖,5.0)的代码。 从API的RemoteControlClient 21用法已过时,并且使用MediaSession鼓励。

初始化阶段:

    if (mAudioManager == null) {
        mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
    }

    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
        if (mRemoteControlClient == null) {
            Log.d("init()", "API " + Build.VERSION.SDK_INT + " lower then " + Build.VERSION_CODES.LOLLIPOP);
            Log.d("init()", "Using RemoteControlClient API.");

            mRemoteControlClient = new RemoteControlClient(PendingIntent.getBroadcast(this, 0, new Intent(Intent.ACTION_MEDIA_BUTTON), 0));
            mAudioManager.registerRemoteControlClient(mRemoteControlClient);
        }
    } else {
        if (mMediaSession == null) {
            Log.d("init()", "API " + Build.VERSION.SDK_INT + " greater or equals " + Build.VERSION_CODES.LOLLIPOP);
            Log.d("init()", "Using MediaSession API.");

            mMediaSession = new MediaSession(this, "PlayerServiceMediaSession");
            mMediaSession.setFlags(MediaSession.FLAG_HANDLES_TRANSPORT_CONTROLS);
            mMediaSession.setActive(true);

        }
    }

发送歌曲的元数据信息,AVRCP兼容的蓝牙音频设备的方法:

private void onTrackChanged(String title, String artist, String album, long duration, long position, long trackNumber) {

    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {

        RemoteControlClient.MetadataEditor ed = mRemoteControlClient.editMetadata(true);
        ed.putString(MediaMetadataRetriever.METADATA_KEY_TITLE, title);
        ed.putString(MediaMetadataRetriever.METADATA_KEY_ARTIST, artist);
        ed.putString(MediaMetadataRetriever.METADATA_KEY_ALBUM, album);
        ed.putLong(MediaMetadataRetriever.METADATA_KEY_DURATION, duration);
        ed.putLong(MediaMetadataRetriever.METADATA_KEY_CD_TRACK_NUMBER, trackNumber);
        ed.apply();

        mRemoteControlClient.setPlaybackState(RemoteControlClient.PLAYSTATE_PLAYING, position, 1.0f);
    } else {

        MediaMetadata metadata = new MediaMetadata.Builder()
                .putString(MediaMetadata.METADATA_KEY_TITLE, title)
                .putString(MediaMetadata.METADATA_KEY_ARTIST, artist)
                .putString(MediaMetadata.METADATA_KEY_ALBUM, album)
                .putLong(MediaMetadata.METADATA_KEY_DURATION, duration)
                .putLong(MediaMetadata.METADATA_KEY_TRACK_NUMBER, trackNumber)
                .build();

        mMediaSession.setMetadata(metadata);

        PlaybackState state = new PlaybackState.Builder()
                .setActions(PlaybackState.ACTION_PLAY)
                .setState(PlaybackState.STATE_PLAYING, position, 1.0f, SystemClock.elapsedRealtime())
                .build();

        mMediaSession.setPlaybackState(state);
    }
}

如果调用元数据的变化,但是否我们有A2DP连接到音频蓝牙设备。 不需要发送,如果我们没有连接的元数据信息:

if (mAudioManager.isBluetoothA2dpOn()) {
    Log.d("AudioManager", "isBluetoothA2dpOn() = true");
    onTrackChanged(getTitle(), getArtist(), getAlbum(), getDuration(), getCurrentPosition(), getId());
}

清理的破坏:

@Override
public void onDestroy() {
    super.onDestroy();

[..]    

if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
        mAudioManager.unregisterRemoteControlClient(mRemoteControlClient);
    } else {
        mMediaSession.release();
    }
}

这是怎么看起来像我的汽车音响



Answer 3:

这花了我永远搞清楚。 只是广播的意图没有工作。 我AVRCP通过发送意图实施工作RemoteControlClient

下面是我使用的代码:

public void onCreate(){
    super.onCreate();

    mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
    ComponentName rec = new ComponentName(getPackageName(), MyReceiver.class.getName());
    mAudioManager.registerMediaButtonEventReceiver(rec);

    Intent i = new Intent(Intent.ACTION_MEDIA_BUTTON);
    i.setComponent(rec);
    PendingIntent pi = PendingIntent.getBroadcast(this, 0, i, 0);
    mRemoteControlClient = new RemoteControlClient(pi);
    mAudioManager.registerRemoteControlClient(mRemoteControlClient);

    int flags = RemoteControlClient.FLAG_KEY_MEDIA_PREVIOUS
            | RemoteControlClient.FLAG_KEY_MEDIA_NEXT
            | RemoteControlClient.FLAG_KEY_MEDIA_PLAY
            | RemoteControlClient.FLAG_KEY_MEDIA_PAUSE
            | RemoteControlClient.FLAG_KEY_MEDIA_PLAY_PAUSE
            | RemoteControlClient.FLAG_KEY_MEDIA_STOP
            | RemoteControlClient.FLAG_KEY_MEDIA_FAST_FORWARD
            | RemoteControlClient.FLAG_KEY_MEDIA_REWIND;
    mRemoteControlClient.setTransportControlFlags(flags);
}

private void onTrackChanged(...) {
    String title = ...;
    String artist = ...;
    String album = ...;
    long duration = ...;

    Intent i = new Intent("com.android.music.metachanged");
    i.putExtra("id", 1);
    i.putExtra("track", title);
    i.putExtra("artist", artist);
    i.putExtra("album", album);
    i.putExtra("playing", "true");
    sendStickyBroadcast(i);

    RemoteControlClient.MetadataEditor ed = mRemoteControlClient.editMetadata(true);
    ed.putString(MediaMetadataRetriever.METADATA_KEY_TITLE, title);
    ed.putString(MediaMetadataRetriever.METADATA_KEY_ALBUM, album);
    ed.putString(MediaMetadataRetriever.METADATA_KEY_ARTIST, artist);
    ed.putLong(MediaMetadataRetriever.METADATA_KEY_DURATION, track.getDuration());
    ed.apply();
}

public void onDestroy(){
    mAudioManager.unregisterRemoteControlClient(mRemoteControlClient);
    super.onDestroy();
}


Answer 4:

要发送的轨道元数据需要发送的意图音响主机。

Intent avrcp = new Intent("com.android.music.metachanged");
avrcp.putExtra("track", "song title");
avrcp.putExtra("artist", "artist name");
avrcp.putExtra("album", "album name");
Context.sendBroadcast(avrcp);

当歌曲播放完毕再派意图与该putExtra方法的第二个参数空字符串。



Answer 5:

你并不需要,如果你正在使用的组件的版本COMPAT控制SDK_INT。 下面的代码与许多车载蓝牙设备测试和工程般的魅力。 有些设备不理解一些键,以便其更好地使用可能的密钥。 参考 。 不要在此之前忘记.build()putBitmap后

public static void sendTrackInfo() {
if(audioManager == null) {
    audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
}

if (mMediaSession == null) {
    mMediaSession = new MediaSessionCompat(this, "PlayerServiceMediaSession");
    mMediaSession.setFlags(MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS);
    mMediaSession.setActive(true);
}

if (audioManager.isBluetoothA2dpOn()) {
    try {
        String songTitle = getTitle();
        String artistTitle = getArtist();
        String radioImageUri = getImagesArr().get(0);
        String songImageUri = getImagesArr().get(1);
        long duration = getDuration();

        final MediaMetadataCompat.Builder metadata = new MediaMetadataCompat.Builder();

        metadata.putString(MediaMetadataCompat.METADATA_KEY_TITLE, songTitle);
        metadata.putString(MediaMetadataCompat.METADATA_KEY_DISPLAY_TITLE, songTitle);
        metadata.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, artistTitle);
        metadata.putString(MediaMetadataCompat.METADATA_KEY_ALBUM_ARTIST, artistTitle);
        metadata.putString(MediaMetadataCompat.METADATA_KEY_ART_URI, radioImageUri);
        metadata.putString(MediaMetadataCompat.METADATA_KEY_DISPLAY_ICON_URI, radioImageUri);
        metadata.putString(MediaMetadataCompat.METADATA_KEY_ALBUM_ART_URI, songImageUri);
        metadata.putLong(MediaMetadataCompat.METADATA_KEY_DURATION, duration);

        imageCounter = 0;

        Glide.with(act)
                .load(Uri.parse(radioImageUri))
                .asBitmap()
                .into(new SimpleTarget<Bitmap>(250, 250) {
                    @Override
                    public void onResourceReady(Bitmap bitmap, GlideAnimation anim) {
                        metadata.putBitmap(MediaMetadataCompat.METADATA_KEY_ART, bitmap);
                        metadata.putBitmap(MediaMetadataCompat.METADATA_KEY_DISPLAY_ICON, bitmap);

                        imageCounter = imageCounter + 1;

                        if(imageCounter == 2) {
                            mMediaSession.setMetadata(metadata.build());
                        }
                    }
                });

        Glide.with(act)
                .load(Uri.parse(songImageUri))
                .asBitmap()
                .into(new SimpleTarget<Bitmap>(250, 250) {
                    @Override
                    public void onResourceReady(Bitmap bitmap, GlideAnimation anim) {
                        metadata.putBitmap(MediaMetadataCompat.METADATA_KEY_ALBUM_ART, bitmap);

                        imageCounter = imageCounter + 1;

                        if(imageCounter == 2) {
                            mMediaSession.setMetadata(metadata.build());
                        }
                    }
                });
    }
    catch (JSONException e) {
        e.printStackTrace();
    }
}

}



文章来源: send track informations via A2DP/AVRCP