android:configChanges="screenSize|smallestScreenSize|screenLayout|orientation"
android:supportsPictureInPicture="true"

PictureInPictureParams.Builder mPictureInPictureParamsBuilder =
            new PictureInPictureParams.Builder();

ArrayList<RemoteAction> actions = new ArrayList<>();

 final PendingIntent intent =
                PendingIntent.getBroadcast(
                        MainActivity.this,
                        requestCode,
                        new Intent(ACTION_MEDIA_CONTROL).putExtra(EXTRA_CONTROL_TYPE, controlType),
                        0);
actions.add(new RemoteAction(icon, title, title, intent));

mPictureInPictureParamsBuilder.setActions(actions);

private BroadcastReceiver mReceiver;

 mReceiver =
                    new BroadcastReceiver() {
                        @Override
                        public void onReceive(Context context, Intent intent) {
                            if (intent == null
                                    || !ACTION_MEDIA_CONTROL.equals(intent.getAction())) {
                                return;
                            }

                            // This is where we are called back from Picture-in-Picture action items.
                            //這就是我們從畫中畫模式的操作回調(diào)的地方
                            final int controlType = intent.getIntExtra(EXTRA_CONTROL_TYPE, 0);
                            switch (controlType) {
                                case CONTROL_TYPE_PLAY:
                                    mMovieView.play();
                                    break;
                                case CONTROL_TYPE_PAUSE:
                                    mMovieView.pause();
                                    break;
                            }
                        }
                    };
            registerReceiver(mReceiver, new IntentFilter(ACTION_MEDIA_CONTROL));

private MovieView mMovieView;

//各種操作
mMovieView.showControls();
mMovieView.pause();
mMovieView.play();
mMovieView.hideControls();
mMovieView.setAdjustViewBounds(false);