// status bar height
        int statusBarHeight = 0;
        int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
        if (resourceId > 0) {
            statusBarHeight = getResources().getDimensionPixelSize(resourceId);
        }

        // action bar height
        int actionBarHeight = 0;
        final TypedArray styledAttributes = getActivity().getTheme().obtainStyledAttributes(
            new int[] { android.R.attr.actionBarSize }
        );
        actionBarHeight = (int) styledAttributes.getDimension(0, 0);
        styledAttributes.recycle();

        // navigation bar height
        int navigationBarHeight = 0;
        int resourceId = getResources().getIdentifier("navigation_bar_height", "dimen", "android");
        if (resourceId > 0) {
            navigationBarHeight = resources.getDimensionPixelSize(resourceId);
        }