安卓遊戲控制

Question

幫我在我的Adnroid內遊戲控制）

我有2個按鈕： 移動左，向右移動。如果我們按左邊精靈向左移動，如果我們按右精靈移動。

這裏是代碼：

public boolean onTouchEvent(MotionEvent event) { 
    if (event.getAction() == MotionEvent.ACTION_DOWN || 
       event.getAction() == MotionEvent.ACTION_MOVE){ 
     touchX = event.getX(); 
    } 
    if(touchX == arrow_leftX){ 
     gameLoopThread.setRunning(false); 
    } 
    else if(touchX == arrow_leftX){ 
     playerX = playerX - xSpeed; 
    } 
    else if(touchX == arrow_rightX){ 
     playerX = playerX - xSpeed; 
    } 
    else if(touchX == arrow_rightX){ 
     gameLoopThread.setRunning(false); 
    } 
    return super.onTouchEvent(event); 
} 

所以，問題是：

它移動只剩下，我不知道如何移動嗎？

Answer 1

The Problem is here i think 

else if(touchX == arrow_rightX){ 
     playerX = playerX - xSpeed; 
    } 


else if(touchX == arrow_rightX){ 

// Here You can see that you are again subtracting the x axis from 
// playerX 
// it is clear that you are moving your image with this 
// but if you decrease value from x it shall move to lext 
// to move it to right you need to increase its value 

     playerX = playerX + xSpeed; 
    }