How to show/Hide Navigation Drawer programmatically

Question

How can I use button to show/hide Navigation Drawer, I have used this SO link to create and manage Navigation Drawer.

Now i am using (Swipe to right from left - to show)

Answer 1

Grab a reference to the DrawerLayout and call closeDrawer(int) to close it and openDrawer(int) to open it. The int parameter refers to the gravity. In your case it should be GravityCompat.LEFT/ GravityCompat.START, because accordingly to the screenshot you posted, your DrawerLayout open and close on the left.