Java Android应用程序中的操作栏上未显示操作项/图标

我正在尝试在我的操作栏上进行搜索操作。我已经设置了一个图标，并将showAsAction设置为always，但它仍然始终显示在溢出菜单中。如何使其显示在操作栏上？谢谢

活动

public class MainActivity extends ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

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

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        Toast.makeText(getApplicationContext(), "Settings",
                   Toast.LENGTH_LONG).show();
        return true;
    }
    if (id == R.id.action_search) {
        Toast.makeText(getApplicationContext(), "Search",
                   Toast.LENGTH_LONG).show();
        return true;
    }
    return super.onOptionsItemSelected(item);
}

}

菜单XML文件

<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.testtabs.MainActivity" >

<item
    android:id="@+id/action_settings"
    android:orderInCategory="100"
    android:title="@string/action_settings"
    app:showAsAction="never"/>
<item
    android:id="@+id/action_search"
    android:actionViewClass="android.support.v7.widget.SearchView"
    android:icon="@drawable/ic_search"
    android:showAsAction="always"
    android:title="@string/title_search"/>

</menu>

要么移除

android:actionViewClass="android.support.v7.widget.SearchView"

或者在OnOptions ItemSelected中删除操作搜索的案例陈述。执行上述任一操作都将显示图标

如果要使用SearchView，则回调的处理方式与OnOptions ItemSelected不同

---

此处的文档：

只需更改应用程序：showAsAction而不是android：showAsAction

<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.testtabs.MainActivity" >

    <item
        android:id="@+id/action_settings"
        android:orderInCategory="100"`enter code here`
        android:title="@string/action_settings"
        app:showAsAction="never"/>
    <item
        android:id="@+id/action_search"
        android:actionViewClass="android.support.v7.widget.SearchView"
        android:icon="@drawable/ic_search"
        app:showAsAction="always"
        android:title="@string/title_search"/>

    </menu>