Question

我试图得到一个菜单项的参考，但我只是不能。这一切都在一个片段里面。

菜单：boat_accept_menu.xml:

    <?xml version="1.0" encoding="utf-8"?>
    <menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="com.example.toolbar.MainActivity" >

    <item
        android:id="@+id/done_boat_select"
        android:title="@string/done_C"
        app:showAsAction="always"/>

</menu>

您可以在代码中看到评论，我无法获得参考。

代码：

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


        //boatClassSelectedBtn =(View) menu.findItem(R.id.done_boat_select);
        //Cannot Cast Exception

        //boatClassSelectedBtn =(View) menu.findItem(R.id.done_boat_select).getActionView();
        //Null reference

        //boatClassSelectedBtn = menu.getItem(0).getActionView();
        //Null reference

        if (boatClassSelectedBtn == null) {
            Log.e("boatClassSelectedBtn", "NULL!");
        }
        else
        {
            Log.i("boatClassSelectedBtn", "OK!");
        }

    }

有什么问题？怎么做到这一点？

Answer 1

这是获取MenuItem

参考的正确方法

private MenuItem boatClassSelectedButton;


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);
    boatClassSelectedButton = (MenuItem) menu.findItem(R.id.done_boat_select);
    return true;
}

Answer 2

结束：

@Override
    public void onCreateOptionsMenu(final Menu menu, MenuInflater inflater) {
        getActivity().getMenuInflater().inflate(R.menu.boat_accept_menu, menu);

        MenuItem menuItem = menu.getItem(0);

        TextView doneTv = new TextView (getActivity());   
        doneTv.setTextView("Ok")

        boatClassSelectedBtn = menuItem.getActionView();

        boatClassSelectedBtn.setOnClickListener(this);

    }

Answer 3

试试这个。

MenuItem boatClassSelectedBtn = menu.findItem(R.id.done_boat_select);

Answer 4

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

    MenuItem deleteItem = menu.findItem(R.id.action_delete_club);
    if (!canDelete()) {
        deleteItem.setVisible(false);
    }
}

如何从菜单项获取视图参考？

4 个答案: