public void setDrawerElevation(float elevation) {
        mDrawerElevation = elevation;
        for (int i = 0; i < getChildCount(); i++) {
            View child = getChildAt(i);
            if (isDrawerView(child)) {
                ViewCompat.setElevation(child, mDrawerElevation);
            }
        }
    }
Sets the base elevation of the drawer(s) relative to the parent, in pixels. Note that the
elevation change is only supported in API 21 and above.

@param elevation The base depth position of the view, in pixels.
app/src/main/java/com/sunnyweather/android/ui/customerUIs/HomeDrawerLayout.java