在Android 5.0中使用AppCompat的SearchView上的NullPointerException

我正在使用所有AppCompat主题更新我的应用程序.我在这里得到一个nullpointer：

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu,menu);
    MenuItem searchItem = menu.findItem(R.id.menu_search);
    SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);

    setupNewSearchView(searchItem,searchManager);

    return true;
}

private void setupNewSearchView(final MenuItem searchItem,SearchManager searchManager) {
    final SearchView searchView = (SearchView) searchItem.getActionView();

   // Null at line below
    searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName())); 

   // Everything else below edited out
}

这是我的主要进口：

import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBaractivity;
import android.support.v7.widget.SearchView;

我认为更新到AppCompat时,这一行必须更改吗？

final SearchView searchView = (SearchView) searchItem.getActionView();

更新：

我把它改成了这个

final SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);

具有相同的空结果…

更新 – 添加XML

<?xml version="1.0" encoding="utf-8"?>
<menu
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto" >

     <item
        android:id="@+id/menu_search"
        app:actionViewClass="android.support.v7.widget.SearchView"
        android:icon="@android:drawable/ic_menu_search"
        app:showAsAction="always"
        android:title="search" />
    <item

</menu>

logcat的：

10-24 11:49:07.040: E/AndroidRuntime(4846): java.lang.NullPointerException
10-24 11:49:07.040: E/AndroidRuntime(4846):     at com.---.---.MainFragmentActivity.setupNewSearchView(MainFragmentActivity.java:1300)
10-24 11:49:07.040: E/AndroidRuntime(4846):     at com.---.---.MainFragmentActivity.onCreateOptionsMenu(MainFragmentActivity.java:1292)
10-24 11:49:07.040: E/AndroidRuntime(4846):     at android.app.Activity.onCreatePanelMenu(Activity.java:2538)
10-24 11:49:07.040: E/AndroidRuntime(4846):     at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:275)
10-24 11:49:07.040: E/AndroidRuntime(4846):     at android.support.v7.app.ActionBaractivity.superOnCreatePanelMenu(ActionBaractivity.java:276)
10-24 11:49:07.040: E/AndroidRuntime(4846):     at android.support.v7.app.ActionBaractivityDelegate$1.onCreatePanelMenu(ActionBaractivityDelegate.java:79)
10-24 11:49:07.040: E/AndroidRuntime(4846):     at android.support.v7.app.ActionBaractivityDelegateBase.preparePanel(ActionBaractivityDelegateBase.java:1056)
10-24 11:49:07.040: E/AndroidRuntime(4846):     at android.support.v7.app.ActionBaractivityDelegateBase.doInvalidatePanelMenu(ActionBaractivityDelegateBase.java:1259)

解决方法

使用支持库,您必须使用一个特殊的菜单项类：MenuItemCompat.

android.support.v4.view.MenuItemCompat

方法名称(getActionView)保持不变.

您的菜单xml应如下所示：

<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="@android:drawable/ic_menu_search"
        app:showAsAction="always"
        app:actionViewClass="android.support.v7.widget.SearchView"
        android:title="Search"/>
</menu>