在工具栏上显示活动和片段的不同菜单选项 [英] Show different menu options on Toolbar for activity and fragment

问题描述

Android Studio 1.4

我有一个在activity_main.xml中充气的工具栏. 我有一个名为main.xml的菜单，该菜单会膨胀，上面只有一个图标可以显示.

I have a Toolbar that I inflate in my activity_main.xml. I have a menu called main.xml that gets inflated that has just 1 icon to display on it.

当用户单击以打开片段时.我还有另一个带有2个图标的菜单friends.xml.

When the user clicks to open a fragment. I have another menu friends.xml that has 2 icons.

当我在片段中添加好友菜单时，它仍显示main.xml菜单中的图标.

When I inflate the friends menu in the fragment it still displays the icon from the main.xml menu.

我认为在工具栏上增加一个新菜单会删除现有菜单.

I thought that inflating a new menu on the toolbar would remove the existing menu.

这是main.xml菜单的屏幕截图.显示查找图标

This is a screenshot of the main.xml menu. The find icon is displayed

这是该片段的屏幕截图，您可以看到查找图标仍然存在.

This is the screenshot of the fragment as you can see the find icon is still there.

activity_main.xml包含工具栏

<android.support.v4.widget.DrawerLayout
    android:id="@+id/drawer_layout"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <include
            android:id="@+id/tbMain"
            layout="@layout/app_bar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

        <FrameLayout
            android:id="@+id/content_frame"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:clickable="true"/>
    </LinearLayout>
</android.support.v4.widget.DrawerLayout>

这是我在MainActivity.java中创建菜单的代码

here is my code for create the menu in MainActivity.java

    private void setupToolBar() {
        mToolbar = (Toolbar)findViewById(R.id.tbMain);
        setSupportActionBar(mToolbar);

        getSupportActionBar().setHomeButtonEnabled(true);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }

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

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        return super.onOptionsItemSelected(item);
    }

在我的片段中，我有这个，正如您所看到的，我正在膨胀friends.xml菜单.

And in my fragment I have this, as you can see I am inflating the friends.xml menu.

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

非常感谢您的任何建议，

Many thanks for any suggestions,

推荐答案

我不确定您是否可以使用onCreateOptionsMenu()执行此操作.我认为您最好的选择是 onPrepareOptionsMenu() .

I'm not sure if you can do this with onCreateOptionsMenu(). I think your better bet will be onPrepareOptionsMenu().

您可以通过简单地编写

You can force Android to refresh the options menu by simply writing getActivity().invalidateOptionsMenu() in Fragment's onResume().

所以您的onPrepareOptionsMenu()如下所示:

@Override
public void onPrepareOptionsMenu(Menu menu) {
    super.onPrepareOptionsMenu(menu);
    menu.clear();    //remove all items
    getActivity().getMenuInflater().inflate(R.menu.menu_fragment, menu);
}

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