Android 如何在工具栏中隐藏菜单项（查看寻呼机、嵌套片段）

我的问题是：

我有一个

活动

，带有

工具栏

和

查看页面

，其中包含三个主要

片段

，其中两个具有嵌套的

片段

：

• [1] RootMapFrag，
  • MarkerMapFrag
  • 热图
• [2] 根列表框，
  • ListFrag
  • WebViewFrag
• [3] 格拉夫弗拉格

在

ListFragment

中，我创建了带有搜索按钮的菜单，用于过滤

回收器视图

，该菜单在

片段

中实现。在我的整个应用程序中，只有一个按钮在

ListFragment

中初始化<代码>搜索按钮工作正常，但在[1]和[3]选项卡上也可见。有没有办法从这些选项卡中隐藏它？我试图在

片段
中通过设置
menu.getItem（R.id.action\u search）.setVisible（false）
和
invalidateOptionsMenu（）
来实现
设置选项菜单（true）
和
onPrepareOptionsMenu
，它们不需要这个菜单项，但没有任何用处。有没有办法做到这一点？这是我的密码：

RootListFragment

public class RootListFragment extends Fragment {

    private FragmentManager fragmentManager;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_root_list, container, false);

        fragmentManager = getChildFragmentManager();
        fragmentManager.beginTransaction().add(R.id.root_list_fragment, new ListFragment()).commit();

        return view;
    }
}

public class ListFragment extends Fragment implements SearchView.OnQueryTextListener {

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

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_list, container, false);

        ...

        return view;
    }

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

        MenuItem item = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
        searchView.setOnQueryTextListener(this);

        MenuItemCompat.setOnActionExpandListener(item,
                new MenuItemCompat.OnActionExpandListener() {
                    @Override
                    public boolean onMenuItemActionExpand(MenuItem item) {
                        return true;
                    }

                    @Override
                    public boolean onMenuItemActionCollapse(MenuItem item) {
                        return true;
                    }
                });
    }
}

public class GraphFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_graph, container, false);

        ...

        return view;
    }

    @Override
    public void onPrepareOptionsMenu(Menu menu) {
        menu.getItem(R.id.action_search).setVisible(false);
        super.onPrepareOptionsMenu(menu);
    }
}

ListFragment

public class RootListFragment extends Fragment {

    private FragmentManager fragmentManager;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_root_list, container, false);

        fragmentManager = getChildFragmentManager();
        fragmentManager.beginTransaction().add(R.id.root_list_fragment, new ListFragment()).commit();

        return view;
    }
}

public class ListFragment extends Fragment implements SearchView.OnQueryTextListener {

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

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_list, container, false);

        ...

        return view;
    }

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

        MenuItem item = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
        searchView.setOnQueryTextListener(this);

        MenuItemCompat.setOnActionExpandListener(item,
                new MenuItemCompat.OnActionExpandListener() {
                    @Override
                    public boolean onMenuItemActionExpand(MenuItem item) {
                        return true;
                    }

                    @Override
                    public boolean onMenuItemActionCollapse(MenuItem item) {
                        return true;
                    }
                });
    }
}

public class GraphFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_graph, container, false);

        ...

        return view;
    }

    @Override
    public void onPrepareOptionsMenu(Menu menu) {
        menu.getItem(R.id.action_search).setVisible(false);
        super.onPrepareOptionsMenu(menu);
    }
}

GraphFragment

public class RootListFragment extends Fragment {

    private FragmentManager fragmentManager;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_root_list, container, false);

        fragmentManager = getChildFragmentManager();
        fragmentManager.beginTransaction().add(R.id.root_list_fragment, new ListFragment()).commit();

        return view;
    }
}

public class ListFragment extends Fragment implements SearchView.OnQueryTextListener {

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

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_list, container, false);

        ...

        return view;
    }

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

        MenuItem item = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
        searchView.setOnQueryTextListener(this);

        MenuItemCompat.setOnActionExpandListener(item,
                new MenuItemCompat.OnActionExpandListener() {
                    @Override
                    public boolean onMenuItemActionExpand(MenuItem item) {
                        return true;
                    }

                    @Override
                    public boolean onMenuItemActionCollapse(MenuItem item) {
                        return true;
                    }
                });
    }
}

public class GraphFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_graph, container, false);

        ...

        return view;
    }

    @Override
    public void onPrepareOptionsMenu(Menu menu) {
        menu.getItem(R.id.action_search).setVisible(false);
        super.onPrepareOptionsMenu(menu);
    }
}

以下是我的应用程序中的gif：

在
片段中，如果您不想显示任何菜单选项，则需要
设置选项菜单（false）onCreate（）
中的code>，如下所示：

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