由网友(愿时光温柔对待我的爸妈)分享简介：我下面的 developer.android.com 的教程，并尝试添加的操作栏项目。 I am following the tutorial on developer.android.com and trying to add items on action bar. 虽然我添加了所有code中的搜索行为显示为溢...

我下面的 developer.android.com 的教程，并尝试添加的操作栏项目。

I am following the tutorial on developer.android.com and trying to add items on action bar.

虽然我添加了所有code中的搜索行为显示为溢出​​的元素，而不是一个操作按钮元素。我尝试了4和7个软键盘选项的虚拟设备。

Although i added all the code the search action shows as an overflow element instead of an action button element. I tried on 4" and 7" virtual devices with soft keyboard option.

下面是

main_activity_actions.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<!-- Search, should appear as action button -->
<item android:id="@+id/action_search"
    android:icon="@drawable/ic_action_search"
    android:title="@string/action_search"
    android:showAsAction="ifRoom" />
<!-- Settings, should always be in the overflow -->
<item android:id="@+id/action_settings"
    android:title="@string/action_settings"
    android:showAsAction="never" />
</menu>

下面是 MainActivity.java 的 onCreateOptionsMenu 方法。

 @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main_activity_actions, menu);
        return super.onCreateOptionsMenu(menu);
    }

我想了解是什么原因导致了这个问题。

I want to learn what causes this problem.

推荐答案

这是因为如果使用支持AppCompat动作条图书馆，ActionBarActivity你应该比ActioBarSherlock或创建XML的菜单的标准方法不同的创建你的菜单默认的动作条。

This is because if you use the support AppCompat ActionBar library and ActionBarActivity you should create your menus in a different than the standard way of creating xml menus in ActioBarSherlock or the default ActionBar.

那么试试这个code：

So try this code :

<menu xmlns:android="http://schemas.android.com/apk/res/android" 
      xmlns:app="http://schemas.android.com/apk/res-auto">
      <item android:id="@+id/action_search"
          android:icon="@drawable/ic_action_search"
          android:title="@string/action_search"
          app:showAsAction="always"  />
      <item android:id="@+id/action_compose"
          android:icon="@drawable/ic_action_compose"
          android:title="@string/action_compose" 
          app:showAsAction="always"/>
</menu>