在父视图中处理触摸，但在子视图中处理单击事件

Question

i have a custom ViewGroup that extends linearLayout and this view group has a gridView as child . i want if mGridView clicked mGridView.onClickListener called and executed but handle other touch events(like move mGridView ) in my custom view Group (onTouchEvent() executed ). so i ovveride onInterceptTouchEvent :

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {

    int action = ev.getAction();
    int y = (int) ev.getY();

    if( action == MotionEvent.ACTION_DOWN && y > mGridView.getTop() )  //y > mGridView,getTop() checks if position of touch in mGridView Position or not.
       return false;

    return true;

}

but mGridView.OnClickListener() never called .

Answer 1

A click event is a composite event, it does not consist only of an MotionEvent.ACTION_DOWN.

It should have a MotionEvent.ACTION_DOWN, probably several other MotionEvent.ACTION_MOVE and finally a MotionEvent.ACTION_UP, and all these inside the bounds of your clicked view.

You should define other MotionEvents to "return false" inside the method onInterceptTouchEvent(MotionEvent ev). maybe something like:

if( (action == MotionEvent.ACTION_DOWN || action == MotionEvent.ACTION_DOWNaction == MotionEvent.ACTION_MOVE || action == MotionEvent.ACTION_UP) && y > mGridView.getTop() )

Appart from this which you have probably already read, take a look at Detecting Common Gestures

Alternatively(but not really suggesting it) try not using an OnClickListener on your View but an OnTouchListener. With your current code you should receive there the MotionEvent.ACTION_DOWN you are now returning false