In the last article you saw how to use DrawerLayout to create NavigationDrawer. Once you have a NavigationDrawer you may want to handle the drawer open and close events.
Like if the DrawerLayout is open you may like to display a different title and also hide some menu items.
In order to handle such events you need to create a ActionBarDrawerToggle object and assign it as a Drawer Listener.
Follow the video and refer to the Source code here