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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);
    }
}