如何获取我的活动的选项菜单？

In some methods of my Activity I want to check the title of menu or know if it is checked or not. How can I get Activity's menu. I need something like this.getMenu()

在我的Activity的一些方法中，我想检查菜单的标题或知道它是否被选中。我怎样才能获得Activity的菜单。我需要像这样的东西.getMenu（）

5 个解决方案

#1

Be wary of invalidateOptionsMenu(). It recreates the entire menu. This has a lot of overhead and will reset embedded components like the SearchView. It took me quite a while to track down why my SearchView would "randomly" close.

警惕invalidateOptionsMenu（）。它重新创建整个菜单。这会产生大量开销，并会重置SearchView等嵌入式组件。我花了很长时间来追踪为什么我的SearchView会“随机”关闭。

I ended up capturing the menu as posted by Dark and then call onPrepareOptionsMenu(Menu) as necessary. This met my requirement without an nasty side effects. Gotcha: Make sure to do a null check in case you call onPrepareOptionsMenu() before the menu is created. I did this as below:

我最终捕获了由Dark发布的菜单，然后根据需要调用onPrepareOptionsMenu（菜单）。这符合我的要求，没有令人讨厌的副作用。问题：如果在创建菜单之前调用onPrepareOptionsMenu（），请务必进行空检查。我这样做如下：

private Menu mOptionsMenu;

@Override
public boolean onCreateOptionsMenu(final Menu menu) {
    mOptionsMenu = menu
    ...
}

private void updateOptionsMenu() {
    if (mOptionsMenu != null) {
        onPrepareOptionsMenu(mOptionsMenu);
    }
}

#2

Call invalidateOptionsMenu() instead of passing menu object around.

调用invalidateOptionsMenu（）而不是传递菜单对象。

#3

you could do it by passing the Menu object to your Activity class

你可以通过将Menu对象传递给Activity类来实现

public class MainActivity extends Activity
{
    ...
    ...
    private Menu _menu = null;

    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
    {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        _menu = menu;
        return true;
    }

    private Menu getMenu()
    {
        //use it like this
        return _menu;
    }
}

#4

There several callback methods that provide menu as a parameter.

有几种回调方法可以提供菜单作为参数。

You might wanna manipulate it there.

你可能想在那里操纵它。

For example:

例如：

onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo)
onCreateOptionsMenu(Menu menu)
onCreatePanelMenu(int featureId, Menu menu)

There several more, best you take a look in activity documentation and look for your desired method: http://developer.android.com/reference/android/app/Activity.html

还有几个，最好看看活动文档并寻找您想要的方法：http：//developer.android.com/reference/android/app/Activity.html

#5

As far as I could understand what you want here is which may help you:

据我所知，你想要什么可以帮助你：

1. Refer this tutorial over option menu.

1.通过选项菜单参考本教程。

2. Every time user presses menu button you can check it's title thru getTitle().

2.每次用户按下菜单按钮，您都可以通过getTitle（）检查它的标题。

3. Or if you want to know the last menu item checked or selected when user has not pressed the menu button then you need to store the preferences when user presses.

3.或者，如果您想知道用户未按下菜单按钮时选中或选择的最后一个菜单项，则需要在用户按下时存储首选项。

#1

private Menu mOptionsMenu;

@Override
public boolean onCreateOptionsMenu(final Menu menu) {
    mOptionsMenu = menu
    ...
}

private void updateOptionsMenu() {
    if (mOptionsMenu != null) {
        onPrepareOptionsMenu(mOptionsMenu);
    }
}

#2