在某些片段中隐藏 MenuItem [英] Hide MenuItem in some Fragments

问题描述

我使用具有更多 Fragment 的菜单抽屉.在某些 Fragment s 我有菜单项 REFRESH 但在某些片段中我想隐藏这个菜单项(我不想显示菜单但我不想隐藏 ActionBar).

I using menu drawer which has more Fragments. In some Fragments I have menu item REFRESH but in some fragments I want hide this menu item (I don't want show menu but I don't want hide ActionBar).

我尝试将覆盖 onCreateOptionsMenu() 添加到 Fragment 中，我不想在其中显示此菜单项，但无法使其正常工作.我尝试了很多方法来查看代码中的注释行.知道问题出在哪里吗?最后，当我在 MainActivity 中调用 onPrepareOptionsMenu() 时激活菜单抽屉时，这个菜单项会隐藏，但是当我在 Fragment 中时我需要这样做.

I try add override onCreateOptionsMenu() to Fragment where I don't want show this menu item but I can not get it to work. I try many way see commented line in code. Does any idea where is problem? And last this menu item go to hide when I activate menu drawer when is called onPrepareOptionsMenu() in MainActivity but I need do this when I'm in Fragment.

Fragment 我想隐藏菜单项刷新的位置:

Fragment where I want hide menu item REFRESH:

 public class FindPeopleFragment extends Fragment {
    public FindPeopleFragment(){}

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_find_people, container, false);
        //setHasOptionsMenu(false);
        return rootView;
    }

    private Menu menu=null;
    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater)
    {
        inflater.inflate(R.menu.main, menu);
        this.menu=menu;
        menu.findItem(R.id.refresh).setVisible(false);
        getActivity().invalidateOptionsMenu();
        //setHasOptionsMenu(false);
        super.onCreateOptionsMenu(menu,inflater);
    }
}

MainActivity 其中定义了 MENU DRAWER:

 //Slide menu item click listener
private class SlideMenuClickListener implements
        ListView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
                            long id) {
        // display view for selected nav drawer item
        displayView(position);
    }
}

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

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // toggle nav drawer on selecting action bar app icon/title
    if (mDrawerToggle.onOptionsItemSelected(item)) {
        return true;
    }
    switch (item.getItemId()) {
        case R.id.refresh:
            Toast.makeText(this, "Refreshing data...", Toast.LENGTH_SHORT).show();
            return true;
    }
    return super.onOptionsItemSelected(item);
}

 // Called when invalidateOptionsMenu() is triggered
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    // if nav drawer is opened, hide the action items
    boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
    menu.findItem(R.id.refresh).setVisible(!drawerOpen);
    return super.onPrepareOptionsMenu(menu);
}

推荐答案

在Fragment中不想显示任何菜单选项的地方，需要setHasOptionsMenu(false); 在 onCreate() 中，像这样:

In the Fragment where you don't want to show any menu options, you need setHasOptionsMenu(false); in the onCreate(), like this:

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

但是，您想要隐藏(刷新)的显示菜单属于 MainActivity.这就是它始终显示的原因.由于您想在 Fragment 级别控制菜单(而不是显示 Activity 选项菜单)，我的建议是从 Activity<中删除菜单代码/code> 并在您的 Fragment 中实现它.

However, the menu that is being shown that you would like to hide (REFRESH), belongs to MainActivity. That is why it is always shown. Since you want to control the menu at the Fragment level (and not show an Activity options menu), my suggestion is to delete the menu code from the Activity and implement it in your Fragment.

Activitys 和 Fragments 都可以有自己独立的菜单.请参阅此链接.

Activitys and Fragments can each have their own separate menus. See this link.

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