Android get view location on screen

Question

in the project, I tried adding a View object dynamically in a RelativeLayout

    ImageView card = new ImageView(this);
    card.setImageResource(R.drawable.card);
    RelativeLayout.LayoutParams layoutParams =
            new RelativeLayout.LayoutParams(225, 315);
    layoutParams.addRule(RelativeLayout.CENTER_VERTICAL);
    layoutParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
    layoutParams.rightMargin = 40;
    parent.addView(card, layoutParams);

after a while, when I tried to get the location of this View, no method works. As I found in Studio's debug view, the View's layoutparams and all its attrs like mLeft... got the value 0.

So how could I solve the problem? thanks a lot.

Answer 1

It might be because you tried to get position before onLayout has happened.

You might try something like this:

ViewTreeObserver vto=view.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener(){
@Override public void onGlobalLayout(){
    int [] location = new int[2];
    view.getLocationOnScreen(location);
    x = location[0];
    y = location[1];
    view.getViewTreeObserver().removeGlobalOnLayoutListener(this);
    }
}

Also check how to get view's position in coordinates?