ActionBarSherlock: open submenu with menu button

Question

I'm using ActionBarSherlock-4.1.0-0 and I would like to open my submenu in the Actionbar with the hardware menu button. I'm planing an update and in my old version I used the "normal" menu. I'd like to help users to get used to the new design.

I got the submenu and the main-menu:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater i = getSupportMenuInflater();
    i.inflate(R.menu.main_menu, menu);
    SubMenu subMenu = (SubMenu) menu.findItem(R.id.actionbar_submenu);
    Menu mainMenu = menu;
    return super.onCreateOptionsMenu(menu);
}

and I got a listener to the hardware menu button:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if(event.getAction() == KeyEvent.ACTION_DOWN){
        switch(keyCode) {
        case KeyEvent.KEYCODE_MENU:
            // TODO: expand submenu from actionbar
            return true;

        }
    }
    return super.onKeyDown(keyCode, event);
}

I couldn't find a method or anything else to call.

Answer 1

I try this solution from Frederik with android actionbar and I run into the problem that the submenu opens and closes immediately. Changing to onKeyUp solved this issue.

Here is my code:

@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
    if(keyCode == KeyEvent.KEYCODE_MENU){
        if (event.getAction() == KeyEvent.ACTION_DOWN && optionsMenu != null && optionsMenu.findItem(R.id.sub_menu) != null)
        {
            Log.i(TAG, "performIdentifierAction");
            optionsMenu.performIdentifierAction(R.id.sub_menu, 0);
            return true;
        }
    }
    return super.onKeyUp(keyCode, event);
}

I do check if optionsMenu != null && optionsMenu.findItem(R.id.sub_menu) != null because of compatibility issues with older Android versions without actionbar. This isn't nessesary if you use ActionBarSherlock for all versions.