Draggablepnael视频最小化

Question

下面是我的活动代码。在一个具有可拖动面板的面板上，附加了exoplayer片段。如果我将视频最小化，视频将继续在左下角（如youtube）上运行。在视频后面会显示空白屏幕。相反，如果我最小化视频，则视频应在左下角播放，并且需要显示prevoius活动之后。我该怎么办？

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        draggablepanel = (DraggablePanel)findViewById(R.id.draggable_panel);
        rl = (RelativeLayout)findViewById(R.id.rl);
        rl.setVisibility(View.INVISIBLE);
        hookDraggableListener();
        initializeDraggablepanel();

    }

    public void hookDraggableListener(){
        draggablepanel.setDraggableListener(new DraggableListener() {
            @Override
            public void onMaximized() {
                rl.setVisibility(View.INVISIBLE);
            }

            @Override
            public void onMinimized() {

            }

            @Override
            public void onClosedToLeft() {
                closePlayer();
                Intent i = new Intent(MainActivity.this,HomeScreen.class);
                startActivity(i);
            }

            @Override
            public void onClosedToRight() {
                closePlayer();
                Intent i = new Intent(MainActivity.this,HomeScreen.class);
                startActivity(i);
            }
        });
    }


    public void initializeDraggablepanel(){


        draggablepanel.setFragmentManager(getSupportFragmentManager());
        draggablepanel.setTopFragment(new DragpanelFragOne());
        draggablepanel.setBottomFragment(new DragPanelTwo());
        draggablepanel.setTopViewHeight(550);
        draggablepanel.initializeView();

    }

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

    }

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

    }

    @Override
    public void onBackPressed() {

        Intent i = new Intent(MainActivity.this,HomeScreen.class);
        startActivity(i);
    }

    public static void closePlayer() {
        if (DragpanelFragOne.exoplayer != null) {
            DragpanelFragOne.exoplayer.setPlayWhenReady(false);
            DragpanelFragOne.exoplayer.stop();
            DragpanelFragOne.exoplayer.seekTo(0);
        }
        DragpanelFragOne.exoplayer.clearVideoSurface(); }
}