android 按钮拖动并点击判断

1.在onCreate里写

 

        DisplayMetrics dm = getResources().getDisplayMetrics();  

        screenWidth = dm.widthPixels;  

        screenHeight = dm.heightPixels - 50;

        btn_toPC.setOnTouchListener(this); //btn_toPC为要拖动的按钮

 

 

2.覆写onTouch方法

//touch to drag

    @Override  

    public boolean onTouch(View v, MotionEvent event) {

        int action=event.getAction(); 

        Log.i("touch", "Touch:" + action);

        

        switch(action) {

	        case MotionEvent.ACTION_DOWN:

	            lastX = (int)event.getRawX();

	            lastY = (int)event.getRawY();

	            isclick = false;//当按下的时候设置isclick为false

	            startTime = System.currentTimeMillis();  

	            break;

	        case MotionEvent.ACTION_MOVE:  

	            isclick = true;//当按钮被移动的时候设置isclick为true 

	            int dx = (int)event.getRawX() - lastX;  

	            int dy = (int)event.getRawY() - lastY;  

	          

	            int left = v.getLeft() + dx;  

	            int top = v.getTop() + dy;  

	            int right = v.getRight() + dx;  

	            int bottom = v.getBottom() + dy;                      

	            if(left < 0) {  

	                left = 0;  

	                right = left + v.getWidth();  

	            }

	            if(right > screenWidth) {  

	                right = screenWidth;  

	                left = right - v.getWidth();  

	            }

	            if(top < 0) {  

	                top = 0;  

	                bottom = top + v.getHeight();

	            }

	            if(bottom > screenHeight) {

	                bottom = screenHeight;

	                top = bottom - v.getHeight();

	            }

	            v.layout(left, top, right, bottom);

	            lastX = (int) event.getRawX();

	            lastY = (int) event.getRawY();

	            break;  

	        case MotionEvent.ACTION_UP:

	            endTime = System.currentTimeMillis();  

	            //当从点击到弹起小于半秒的时候,则判断为点击,如果超过则不响应点击事件  

	            if ((endTime - startTime) > 0.1 * 1000L) {  

	                isclick = true;  

	            } else {

	                isclick = false;  

	            }

	            System.out.println("执行顺序up");  

	            break;

        }

        return isclick;

    }

//——————  end  ——————