How to inflate SupportActionBar menu from outside Activity

Question

I decoupled view from my Activity and I have a separate class for all UI related operations. One operation I want to implement there is to inflate menu for Action Bar. I try doing things like these, but none of it works.

fun displayMenu() {

    rootView.toolbar.inflateMenu(R.menu.my_menu)

    rootView.toolbar.setOnMenuItemClickListener { item ->
        if (item.itemId == R.id.action_one) {
            listener.onActionOne()
        }

        true
    }
}

I tried this:

activity.menuInflater.inflate(R.menu.my_menu, rootView.toolbar.menu)

and this:

rootView.toolbar.inflateMenu(R.menu.my_menu)

But none of these gets the job done. How can I inflate this menu?

Answer 1

It was all my silly mistake.

activity.menuInflater.inflate(R.menu.my_menu, rootView.toolbar.menu)

Works perfectly fine. Just remember to call it during or after Activity.onCreateOptionMenu. Complete example to make it works is something like:

public class MyActivity extends AppCompatActivity {

@Inject
MyView myView;

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(myView.getRootView());
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    myView.displayMenu();
    return super.onCreateOptionsMenu(menu);
}

}

public class MyViewImpl implements MyView {

    @Override
    public void displayMenu() {
        activity.getMenuInflater().inflate(
            R.menu.categories_modification_menu,
            rootView.findViewById(R.id.toolbar).getMenu()
        )
    }

}

I used displayMenu() from Activity.onCreate before... Sorry for wasting your time, especially I did not post this part as I thought it is irrelevant to the question...