Android View 拖动&插入 研究

核心提示：if(iv !=null){iv.setOnTouchListener(touchListener);}else {//error, view is null!}}touchListener = new OnTouchListener(){@Overridepublic boolean onTouch(View v,

if(iv !=null){

iv.setOnTouchListener(touchListener);

}

else {

//error, view is null!

}

}

touchListener = new OnTouchListener(){

@Override

public boolean onTouch(View v, MotionEvent event) {

// TODO Auto-generated method stub

int action = event.getAction();

int x = (int) event.getRawX();

int y = (int) event.getRawY();

switch(action){

//鼠标按下 拖拉动作开始

case MotionEvent.ACTION_DOWN:

point1 = v.getTop();

startX = (int)event.getX();

startY = y - v.getTop();

break;

//鼠标移动 拖拉动作进行中

case MotionEvent.ACTION_MOVE:

v.layout(x - startX, y - startY, x + v.getWidth()

- startX, y - startY + v.getHeight());

v.bringToFront();

v.postInvalidate();

break;

//鼠标释放 拖拉动作结束

case MotionEvent.ACTION_UP:

point2 = v.getTop();

//计算插入位置 位于哪两个相邻View之间

int dest = getLocation(v);

//remove ori view, and then add view here

lLayout.removeView(v);

lLayout.addView(v, dest);

break;

}

return false;

}

};

//to listener all ImageView

for(int i=0;i< p>

ImageView iv = (ImageView)lLayout.getChildAt(i);

if(iv !=null){

iv.setOnTouchListener(touchListener);

}

else {

//error, view is null!

}

}

4. getLocation(View) 用于： 根据目标View 判断待插入的位置 即：哪2个相邻ImageView 之间 实现为：

Java代码

public int getLocation(View v){

for(int i=0;i< p>