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
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>
