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:76)

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>