Android 中的 onTouch 方法

如何解决Android 中的 onTouch 方法

我正在尝试使用 onTouch 方法来使用滑动来调节音量和亮度。下面的方法根本没有实现，视频的行为与以前相同。不知道亮度是怎么控制的。下面是方法的实现

public class Activity extends AppCompatActivity implements View.OnTouchListener {
  

    private boolean intLeft,intRight;
    private int sWidth,sHeight;
    private long diffX,diffY;
    private display display;
    private Point size;
    private float downX,downY;
    private AudioManager mAudioManager;
    protected void onCreate(Bundle savedInstanceState) {

             mAudioManager = (AudioManager)getApplicationContext().getSystemService(Context.AUdio_SERVICE);
}
      private void getScreenSize() {
        display = getwindowManager().getDefaultdisplay();
        size = new Point();
        display.getSize(size);
        sWidth = size.x;
        sHeight = size.y;
    }

    @Override
    public boolean onTouch(View v,MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:

         
                downX = event.getX();
                downY = event.getY();
                if (event.getX() < (sWidth / 2)) {

                  
                    intLeft = true;
                    intRight = false;

                } else if (event.getX() > (sWidth / 2)) {

                 
                    intLeft = false;
                    intRight = true;
                }
                break;

            case MotionEvent.ACTION_UP:

            case MotionEvent.ACTION_MOVE:

                float x2 = event.getX();
                float y2 = event.getY();

                diffX = (long) (Math.ceil(event.getX() - downX));
                diffY = (long) (Math.ceil(event.getY() - downY));

                if (Math.abs(diffY) > Math.abs(diffX)) {
                    if (intLeft) {
                   

                        if (downY < y2) {
                         
                        } else if (downY > y2) {
                            
                        }

                    } else if (intRight) {

                      
                        if (downY < y2) {
                          
                            mAudioManager.adjustVolume(AudioManager.ADJUST_LOWER,AudioManager.FLAG_PLAY_SOUND);

                        } else if (downY > y2) {
                            
                            mAudioManager.adjustVolume(AudioManager.ADJUST_RAISE,AudioManager.FLAG_PLAY_SOUND);
                        }
                    }
                }
        }
        return true;
    }

}

如何实现这些方法来控制滑动功能？