来自onOptionsItemSelected的Android访问菜单

Question

I have the following in my activity (sorry new to Java/Android):

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.options, menu);
    return super.onCreateOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch(item.getItemId()) {
    case R.id.selectItem:
            // menu.add(...) --> how to get the menu instance?
        return true;
    default:
        return super.onOptionsItemSelected(item);
    }
}

I am wondering, how can I access a menu object in onOptionsItemSelected? For example, how would I go about adding a new view to the options menu based on the selection of an existing menu item? Is the answer related to "onPrepareOptionsMenu"?

Answer 1

您应该对此类菜单使用SubMenu ... 记住您不能将子菜单添加到另一个子菜单中...所以只有Menu-> Submenu才是可能的，您不能做类似Menu-> Submenu-> Submenu的操作（而Submenu是Dialog选择）