如何在 Android 中向 Fragment 添加选项菜单 [英] How to add Options Menu to Fragment in Android

问题描述

我正在尝试将一组片段中的项目添加到选项菜单中.

I am trying to add an item to the options menu from a group of fragments.

我创建了一个新的 MenuFragment 类并将其扩展到我希望包含菜单项的片段.这是代码:

I have created a new MenuFragment class and extended this for the fragments I wish to include the menu item in. Here is the code:

Java:

public class MenuFragment extends Fragment {

    MenuItem fav;

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

    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        fav = menu.add("add");
        fav.setIcon(R.drawable.btn_star_big_off);
    }
}

科特林:

class MenuFragment : Fragment {

    lateinit var fav: MenuItem

    override fun onCreate(savedInstanceState: Bundle) {
        super.onCreate(savedInstanceState)
        setHasOptionsMenu(true)
    }

    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
        fav = menu.add("add");
        fav.setIcon(R.drawable.btn_star_big_off);
    }
}

出于某种原因，onCreateOptionsMenu 似乎没有运行.

For some reason the onCreateOptionsMenu appears not to run.

推荐答案

调用超级方法:

Java:

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

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        // TODO Add your menu entries here
        super.onCreateOptionsMenu(menu, inflater);
    }

科特林:

    override fun void onCreate(savedInstanceState: Bundle) {
        super.onCreate(savedInstanceState)
        setHasOptionsMenu(true)
    }

    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
        // TODO Add your menu entries here
        super.onCreateOptionsMenu(menu, inflater)
    }

在代码中加入日志语句，看看是否没有调用该方法，或者您的代码是否没有修改菜单.

Put log statements in the code to see if the method is not being called or if the menu is not being amended by your code.

还要确保您在 onCreate(Bundle) 中调用 setHasOptionsMenu(boolean) 以通知片段它应该参与选项菜单处理.

Also ensure you are calling setHasOptionsMenu(boolean) in onCreate(Bundle) to notify the fragment that it should participate in options menu handling.

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