android - Android Lollipop是否从通知中接收媒体按钮操作？

我正在尝试创建一个使用媒体按钮操作的通知，但是如何发送和接收这些按钮？这是我到目前为止所拥有的...

if(mediaSession==null) {
            mediaSession = new MediaSession(this, "Boom");
        }
        //Album art
        ImageView img = (ImageView)findViewById(R.id.img_AlbumArt1);
        Bitmap bitmap = ((BitmapDrawable)img.getDrawable()).getBitmap();

        PendingIntent mPauseIntent = PendingIntent.getBroadcast(this, 0,
                    new Intent(ACTION_PAUSE).setPackage(this.getPackageName()),
                    PendingIntent.FLAG_CANCEL_CURRENT);

        Notification.Builder mBuilder =
            new Notification.Builder(this)
                .setVisibility(Notification.VISIBILITY_PUBLIC)
                .setSmallIcon(R.drawable.ic_media_play)
                .setLargeIcon(bitmap)
                .setContentTitle(playingTitle)
                .setContentText(playingArtist)

                .setStyle(new Notification.MediaStyle()
                        .setMediaSession(mediaSession.getSessionToken())
                        .setShowActionsInCompactView(0,1,2)
                )
                // Add media control buttons that invoke intents in your media service
                .addAction(R.drawable.ic_media_rew, "Previous", null) //#0
                .addAction(R.drawable.ic_media_pause, "Play/Pause", null) //#1
                .addAction(R.drawable.ic_media_ff, "Next", null) //#2 nextPendingIntent
            ;
        // Creates an explicit intent for an Activity in your app
        Intent intent = new Intent(this, Music.class);
        intent.setAction(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_APP_MUSIC);
        // Creates an explicit intent for an Activity in your app
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);

        PendingIntent pendingIntent = PendingIntent.getActivity(this,PendingIntent.FLAG_CANCEL_CURRENT,intent,0);
        mBuilder.setContentIntent(pendingIntent);

        NotificationManager NotiMan=(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        // mId allows you to update the notification later on.
        NotiMan.notify(notification, mBuilder.build());

Android docs建议一个pendingIntent，其中我已临时设置了null，但我一直无法弄清楚如何为此目的制作PendingIntent。

BroadcastReceiver：

private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        final CharSequence action = intent.getAction();
        if(action==ACTION_PAUSE) {
            //mTransportControls.pause();
            Log.i("ON RECEIVE", "ACTION_PAUSE");
        }
    }
};

并在onCreate中：

IntentFilter filter = new IntentFilter();
filter.addAction(ACTION_PAUSE);
this.registerReceiver(mMessageReceiver, filter);

最佳答案

PendingIntent需要指向BroadcastReceiver或可以对指定请求起作用的服务。例如，使用BroadcastReceiver时，您将有一个待处理的意图，看起来像

public static final String ACTION_PAUSE = "com.pkg.name.ACTION_PAUSE";

mPauseIntent = PendingIntent.getBroadcast(mService, REQUEST_CODE,
        new Intent(ACTION_PAUSE).setPackage(pkg),
        PendingIntent.FLAG_CANCEL_CURRENT);

接下来，注册动作/待定意图

 .addAction(R.drawable.ic_media_pause, mContext.getString(R.string.label_previous), mPendingIntent);

最终，当未决的Intent被触发时，您将处理操作。在这里，您可以选择使用MediaController.TransportControls播放/暂停动作。

    @Override
    public void onReceive(Context context, Intent intent) {
        final String action = intent.getAction();
        switch (action) {
          case ACTION_PAUSE:
            mTransportControls.pause();
            break;
        ...
    }

MediaSession应该被实例化并设置为对播放/暂停+其他动作起作用。

mSession = new MediaSession(this, "Service");
mSession.setFlags(MediaSession.FLAG_HANDLES_MEDIA_BUTTONS |
         MediaSession.FLAG_HANDLES_TRANSPORT_CONTROLS);

最后扩展MediaSession.MediaSessionCallback并实现onPlay()/onPause() ..，这实际上将在回放中起作用。