Android之debug---menu的getActionView()return null

MainActivity代码

 @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, menu);

         // Associate searchable configuration with the SearchView
         SearchManager searchManager =
                 (SearchManager) getSystemService(Context.SEARCH_SERVICE);
         SearchView searchView =
                 (SearchView) menu.findItem(R.id.search).getActionView();

         searchView.setSearchableInfo(
                searchManager.getSearchableInfo(getComponentName()));

         return true;
     }

main代码

 <menu xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto">
     <item android:id="@+id/search"
           android:title="@string/search_title"
           android:icon="@drawable/ic_search_api_holo_light"
           app:showAsAction="collapseActionView|ifRoom"
           android:actionViewClass="android.widget.SearchView" />
 </menu>

错误问题：

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.SearchView.setSearchableInfo(android.app.SearchableInfo)' on a null object reference
                                                                                           at com.example.android.basiccontactables.MainActivity.onCreateOptionsMenu(MainActivity.java:)

错误解决：

将main代码中的android:actionViewClass="android.widget.Search"修改为app:actionViewClass="android.widget.Search"即可。

main修改之后如下：

 <menu xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto">
     <item android:id="@+id/search"
           android:title="@string/search_title"
           android:icon="@drawable/ic_search_api_holo_light"
           app:showAsAction="collapseActionView|ifRoom"
           app:actionViewClass="android.widget.SearchView" />
 </menu>