Determine which view is currently being Touched while user Moves finger

Question

I have a grid of 66 views and if a view is touched or dragged/moved over I'd like to change it's background color.

I'm guessing I need to put a touch listener on the parent ViewGroup, but how do I determine which child view is being dragged/moved over?

can you please share the solution to this problem. As i wanted to do similar type of task. — Anmol317, Jul 12 '17 at 07:09

score 21 · Accepted Answer · edited May 23 '17 at 12:26

Found my answer here:

Android : Get view only on which touch was released

Looks like you have to loop through the child views and do hit detection manually to find which view the touch is currently over.

Did this by overriding dispatchTouchEvent on the parent LinearLayout:

LinearLayout parent = new LinearLayout(this.getActivity()){
    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        int x = Math.round(ev.getX());
        int y = Math.round(ev.getY());
        for (int i=0; i<getChildCount(); i++){
            LinearLayout child = (LinearLayout)row.getChildAt(i);
            if(x > child.getLeft() && x < child.getRight() && y > child.getTop() && y < child.getBottom()){
                //touch is within this child
                if(ev.getAction() == MotionEvent.ACTION_UP){
                    //touch has ended
                }
            }
        }
        return true;
    }
}

score 1 · Answer 2 · edited May 23 '17 at 12:34

Not tested but I would think you could do something similar to: ScrollView Inside ScrollView

parentView.setOnTouchListener(new View.OnTouchListener() {

                public boolean onTouch(View v, MotionEvent event) {
                    Log.v(TAG,"PARENT TOUCH");
                    findViewById(R.id.child).getParent().requestDisallowInterceptTouchEvent(false);
                    return false;
                }
            });
            childView.setOnTouchListener(new View.OnTouchListener() {

                public boolean onTouch(View v, MotionEvent event)
                {
                    Log.v(TAG,"CHILD TOUCH");
                     //  Disallow the touch request for parent on touch of child view
                    v.getParent().requestDisallowInterceptTouchEvent(true);
                    return false;
                }
            });

Perhaps by simply looping through all your childViews, setting the OnTouchListener.

Thanks for your response. The problem is onTouch on the child will only fire if a touch begins within the view. It doesn't react to dragging. I did find a solution and posted above. Thanks again! — bgolson, Oct 24 '13 at 17:25

Determine which view is currently being Touched while user Moves finger

2 Answers2