How to detect that Navigation Drawer has been opened with an edge swipe (and not home icon)?

Question

I am using a Navigation Drawer in my Android app.

As this is a pattern that I find really hard to discover, my plan was to add a little message at the bottom of the screen until the user finally discover it and succesfully opened it with a swipe.

I know that I could use:

public void onDrawerOpened(View drawerView) {
    // Stop telling the user, he know how it works
}

But this action is also triggered when opening it with the upper left button in the ActionBar.

Any suggestion to detect a succesfull swipe would be warmly welcome.

Answer 1

You need to listen to the state change callback:

        @Override
        public void onDrawerStateChanged(int newState) {                
            if (newState == DrawerLayout.STATE_DRAGGING) {
                Log.v(TAG, "Drawer opened by dragging");
            }
        }

This state only occurs when user drags the drawer into view. Tapping on home icon does not induce this - which is exactly what you want.