Android可移动控件

可移动控件：

效果图：

获取屏幕的宽高：

         DisplayMetrics dm = getResources().getDisplayMetrics();
         screenWidth = dm.widthPixels;
         screenHeight = dm.heightPixels - 50;
         ImageView imageView = (ImageView)findViewById(R.id.spirit_img);
         imageView.setOnTouchListener(this);

onTouch设定：

     @Override
     public boolean onTouch(View v, MotionEvent event) {
         int action = event.getAction();
         switch (action){
             case MotionEvent.ACTION_DOWN:
                 lastX = (int) event.getRawX();
                 lastY = (int) event.getRawY();
                 break;
             case MotionEvent.ACTION_MOVE:
                 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;
         }
         return false;
     }

layout的办法有一个问题，viewgroup里面的其他东西刷新，imageview就会归位。