postOnLayoutFinished

gistfile1.java

    public static void postOnLayoutFinished(final View v, final Runnable r) {
        if (v == null || r == null) {
            throw new NullPointerException();
        }

        v.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

            @Override
            public void onGlobalLayout() {
                r.run();
                v.getViewTreeObserver().removeGlobalOnLayoutListener(this);
            }
        });
    }