The official site for Android developers. Provides the Android SDK and documentation for app developers and designers.
A good tutorial for Navigation Drawer
The navigation drawer is a panel that displays the app’s main navigation options on the left edge of the screen. It is hidden most of the time, but is revealed when the user swipes a finger from the left edge of the screen or, while at the top level of the app, the user touches the app icon in the action bar.
With navigation drawer, you can easily develop app with YouTube or Google+ apps like navigation.