public void openDrawer(@EdgeGravity int gravity) {
        openDrawer(gravity, true);
    }
Open the specified drawer by animating it out of view.

@param gravity Gravity.TOP to move the top drawer or Gravity.BOTTOM for the bottom.
               GravityCompat.START or GravityCompat.END may also be used.
app/src/main/java/com/sunnyweather/android/ui/customerUIs/HomeDrawerLayout.java