从FragmentTabHost的子片段中添加新的选项菜单到外部片段中

Question

 i. ChildFragment1.java(extends SherlockFragment)

 ii. ChildFragment2.java(extends SherlockFragment)

 iii. ChildFragment3.java(extends SherlockFragment)

但是我不能在ChildFragment1、ChildFragment2、ChildFragment3中添加新的OptionMenu，因为从未调用子片段类的onCreateOptionsMenu（Menu Menu,MenuFlater MenuFlater）方法。

Answer 1

现在，我可以调用子片段的onCreateOptionsMenu，也可以通过以下代码调用onOptionsItemSelected。

碎片2.java

protected FragmentTabHost mTabHost;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
}

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater menuInflater) {
    super.onCreateOptionsMenu(menu, menuInflater);
    Fragment currentFragment = getChildFragmentManager().findFragmentByTag(mTabHost.getCurrentTabTag());
    if (currentFragment != null && currentFragment instanceof BaseTabsPagerChildFragment)
        ((BaseTabsPagerChildFragment) currentFragment).inflateOptionsMenu(menu, menuInflater);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (super.onOptionsItemSelected(item)) {
        return true;
    } else {
        Fragment currentFragment = getChildFragmentManager().findFragmentByTag(mTabHost.getCurrentTabTag());
        if (currentFragment != null && currentFragment instanceof BaseTabsPagerChildFragment) {
            return ((BaseTabsPagerChildFragment) currentFragment).onOptionsItemSelected(item);
        }
    }
    return false;
}

basetabspagerchildfragment.java

abstract class BaseTabsPagerChildFragment extends BaseSherlockFragment {
    public abstract void inflateOptionsMenu(Menu menu, MenuInflater menuInflater);
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
};

@Override
public void inflateOptionsMenu(Menu menu, MenuInflater menuInflater) {
    onCreateOptionsMenu(menu, menuInflater);
}

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater menuInflater) {
    super.onCreateOptionsMenu(menu, menuInflater);
    menuInflater.inflate(R.menu.message_actionbar_menu, menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    boolean handled = super.onOptionsItemSelected(item);
    if (handled) {
        return true;
    }
    int itemId_ = item.getItemId();
    if (itemId_ == R.id.menu_item_compose) {
        launchCompose();
        return true;
    }
    if (itemId_ == R.id.menu_item_delete) {
        doDelete();
        return true;
    }
    return false;
}