在Android 5.0中使用AppCompat的SearchView上出现NullPointerException

Question

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

@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
}

以下是我的主要进口产品：

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

当更新到AppCompat时，我认为这一行必须更改，这是正确的吗？

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null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：

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)

Answer 1

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。

菜单xml应该如下所示：

<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>