text https://proandroiddev.com/collapsing-appbarlayout-on-android-tv-86b538e85eed

Posted 2021-05-03

public interface AppBarExpander {

    void expandAppBar();
    void collapseAppBar();
}

public class SeasonsActivity extends AppCompatActivity implements AppBarExpander {
    ...

    @Override
    public void expandAppBar() {
        boolean animate = true;
        appBarLayout.setExpanded(true, animate);
    }
    
    @Override
    public void collapseAppBar() {
        boolean animate = true;
        appBarLayout.setExpanded(false, animate);
    }
}