quinestor quinestor - 1 year ago 150
Android Question

getWidth() and getHeight() always returning 0. Custom view

In a Fragment, I am inflating a Layout with multiple child View. I need to get the dimensions (width and height) of one of them which is a custom view.

Inside the custom view class I can do it easily. But if I try to do it from the fragment I always get 0 as dimensions.

public void onViewCreated(View view, Bundle savedInstanceState) {

super.onViewCreated(view, savedInstanceState);
View culoide = view.findViewWithTag(DRAW_AREA_TAG);
Log.d("event", "culoide is: "+culoide.getWidth()); // always 0
}


I figure that onViewCreated should be the right place to get it, but well this happens. I tried before super.onViewCreated, in debug it looks like 'findViewWithTag' finds the right view, tried with api 7 v4 support only.

Any help?

Answer Source

You must wait until after the first measure and layout in order to get nonzero values for getWidth() and getHeight(). You can do this with a ViewTreeObserver.OnGlobalLayouListener

public void onViewCreated(final View view, Bundle saved) {
    super.onViewCreated(view, saved);
    view.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
        public void onGlobalLayout() {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
              view.getViewTreeObserver().removeOnGlobalLayoutListener(this);
            } else {
              view.getViewTreeObserver().removeGlobalOnLayoutListener(this);
            }

            // get width and height of the view
        }
    });
}