sample/src/main/java/com/gordonwong/materialsheetfab/sample/MainActivity.java
private void toggleDrawer() {
		if (drawerLayout.isDrawerVisible(GravityCompat.START)) {
			drawerLayout.closeDrawer(GravityCompat.START);
		} else {
			drawerLayout.openDrawer(GravityCompat.START);
		}
	}
private void toggleDrawer() {
		if (drawerLayout.isDrawerVisible(GravityCompat.START)) {
			drawerLayout.closeDrawer(GravityCompat.START);
		} else {
			drawerLayout.openDrawer(GravityCompat.START);
		}
	}
Toggles opening/closing the drawer.