Android realizes the effect of a small rocket on desktop suspension

public class RocketService extends Service {

  private WindowManager mWM;
  private View view;
  private int startX ;
  private int startY ;
  private LayoutParams params;

  @Override
  public IBinder onBind(Intent intent) {
   return null ;
  }

  @Override
  public void onCreate() {
   super .onCreate();
   System. out .println("Service creation...." );
   mWM = (WindowManager) getSystemService(WINDOW_SERVICE );
   winWidth = (). getWidth();
   winHeight = mWM .getDefaultDisplay().getHeight ();

   params = new ();
   params. height = .WRAP_CONTENT ;
   params. width = .WRAP_CONTENT ;
   params. flags = .FLAG_KEEP_SCREEN_ON
     | .FLAG_NOT_FOCUSABLE ;
   params. format = PixelFormat. TRANSLUCENT ;
   params. type = .TYPE_PHONE ;
   params. gravity = Gravity. LEFT + Gravity. TOP;

   view = ( this).inflate(. rocket , null );
   //Get imageview and set frame animation   ImageView ivRocket = (ImageView) view .findViewById(. rocket);
   (. rocket );
   AnimationDrawable drawable = (AnimationDrawable) ();
   ();
   ( view, params);

   // Set the touch event of the view so that it can be dragged   ( new OnTouchListener() {

    @Override
    public boolean onTouch(View v, MotionEvent event) {
     switch (()) {
     case MotionEvent. ACTION_DOWN:
       startX = ( int ) ();
       startY = ( int ) ();
       break ;
     case MotionEvent. ACTION_MOVE:
       int dx = (int ) (() - startX );
       int dy = (int ) (() - startY );
       // Update the floating window position       params. x += dx;
       params. y += dy;

       // Limit window coordinates not to exceed the screen       if (params .x < 0) {
        params. x = 0;
      }

       if (params .x > winWidth - view .getWidth()) {
        params. x = winWidth - view .getWidth();
      }

       if (params .y < 0) {
        params. y = 0;
      }

       if (params .y > winHeight - view .getHeight()) {
        params. y = winHeight - view .getHeight();
      }

       ( view, params );
       startX = ( int ) ();
       startY = ( int ) ();
       break ;
     case MotionEvent. ACTION_UP:
       // Lift your fingers and need to launch a rocket, limiting the range of launching a rocket       if (params .x > 0 && params. x < winWidth
         && params. y > winHeight - 500) {
        sendRocket();
      }
       break ;
     }

     return true ;// No longer pass events to onClick for processing    }

   });
  }

  private Handler mHandler = new Handler() {
   @Override
   public void handleMessage(Message msg) {
     int y = msg.arg1 ;
     params. y = y;
     ( view, params);
   }
  };
  private int winWidth ;
  private int winHeight ;

  // Launch rocket  private void sendRocket() {
   //Update the y-axis with child threads   new Thread(new Runnable() {

    @Override
    public void run() {
     int pos = 1000;
     for (int i=0; i <= 10; i++) {
        int y = pos-100*i;
        //Sleep for 100ms Send a message        try {
         Thread. sleep(100);
        } catch (InterruptedException e) {
         // TODO Auto-generated catch block
         ();
        }

        Message msg = ();
        msg. arg1 = y;
        (msg);
     }
    }
   }).start();
  }

  @Override
  public void onDestroy() {
   // TODO Auto-generated method stub
   super .onDestroy();
   if (mWM != null && view != null) {
    ( view);
    view = null ;
   }

  }
}