SearchView未显示在工具栏中

Question

您好我正在尝试在工具栏中显示SearchView。如果我使用自定义布局而不是app:actionViewClass="android.support.v7.widget.SearchView，则会显示。请找到以下代码。

menu_search_page.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".MyActivity" >

<item android:id="@+id/action_search"
    android:title="Search"
    android:icon="@drawable/abc_ic_search_api_mtrl_alpha"
    app:showAsAction="ifRoom|collapseActionView"
    app:actionViewClass="android.support.v7.widget.SearchView"/>

活动

 @Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.search_page_layout);
    activity = this;
    toolbar = (Toolbar) findViewById(R.id.tool_bar);
    toolbar.setLogo(R.drawable.new_logo);
    toolbar.setTitle("");
    setSupportActionBar(toolbar);
}



@Override
public boolean onCreateOptionsMenu(Menu menu)
{
    MenuInflater menuInflater = getMenuInflater();
    menuInflater.inflate(R.menu.menu_search_page, menu);
    return super.onCreateOptionsMenu(menu);
}