AppBar Layout

Note

It doesn't look like there's anything in the APIs, but the following seems to be working for me. It might need testing.

boolean fullyExpanded =
    (appBarLayout.getHeight() - appBarLayout.getBottom()) == 0;
Edit: The above solution does seem to work, but since I wanted to test this condition when the appbar was scrolled, I ended up using the following solution with OnOffsetChangedListener.

class Frag extends Fragment implements AppBarLayout.OnOffsetChangedListener { 
 
    private boolean appBarIsExpanded = true;
    private AppBarLayout appBarLayout;
 
    @Override  
    public void onActivityCreated(Bundle state) {
        super.onActivityCreated(state);
        appBarLayout = (AppBarLayout) getActivity().findViewById(R.id.app_bar);
    } 
 
    @Override 
    public void onResume() { 
        super.onResume(); 
        appBarLayout.addOnOffsetChangedListener(this);
    } 
 
    @Override 
    public void onStop() { 
        super.onStop(); 
        appBarLayout.removeOnOffsetChangedListener(this);
    } 
 
    @Override 
    public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
        appBarIsExpanded = (verticalOffset == 0);
    }  
 
} 
source :https://stackoverflow.com/questions/32213783/detecting-when-appbarlayout-collapsingtoolbarlayout-is-completely-expanded