get layout height and width at run time android

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Suppose I have to get a LinearLayout width defined in XML. I have to get reference of it by XML. Define LinearLayout l as instance.

 l = (LinearLayout)findviewbyid(R.id.l1);
ViewTreeObserver observer = l.getViewTreeObserver();
        observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

            @Override
            public void onGlobalLayout() {
                // TODO Auto-generated method stub
                init();
            l.getViewTreeObserver().removeGlobalOnLayoutListener(
                    this);
        }
    });

protected void init() {
        int a= l.getHeight();
            int b = l.getWidth();
Toast.makeText(getActivity,""+a+" "+b,3000).show();
    } 
    callfragment();
}

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