java从外部片段内FragmentTabHost的子片段添加新选项菜单

Question

当我为我的应用程序使用一些嵌套片段时，应用程序的子片段无法通过重写onCreateOptions菜单（menu menu，MenuInflater MenuInflater）方法来添加新的选项菜单（从不点击此方法）

应用程序的类层次结构如下所示

主要活动。java（扩展SherlockFragmentActivity） （MainActivity包括以下子片段）

1. 碎片1。java（扩展SherlockFragment）

2. 碎片2。java（扩展SherlockFragment）

（Fragment2包括FragmentTabHost，用于添加以下子片段）

 i. ChildFragment1.java(extends SherlockFragment)

 ii. ChildFragment2.java(extends SherlockFragment)

 iii. ChildFragment3.java(extends SherlockFragment)

我可以通过在onCreate（Bundle savedInstanceState）和 通过覆盖OnCreateOptions菜单（菜单菜单，菜单展开器菜单展开器）

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onCreateOptions菜单（Menu菜单，MenuInflater MenuInflater）方法

Answer 1

您必须手动调用该方法。在您的Fragment2中实现以下内容

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

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    super.onCreateOptionsMenu(menu, inflater);
    ChildFragment frag = (ChildFragment) getChildFragmentManager().findFragmentBy...;
    if (frag != null) frag.inflateOptionsMenu(menu, new MenuInflater(mActivity));
}

在你的ChildFragment中，然后

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

public void inflateOptionsMenu(Menu menu, MenuInflater inflater) {
    onCreateOptionsMenu(menu, inflater);
}

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

我在chat后面的this question中找到了解决方案

Answer 2

现在我可以调用子片段的onCreateOptions菜单，也可以调用以下代码选择的onOptions项

碎片2。爪哇

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。爪哇

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

儿童碎片1。java（扩展BaseTabsPagerChildFragment.java）

@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;
}

谢谢