PreferenceActivity中的ClassCastException

Question

每次嘗試使用此首選項類時，都會收到classCastException，但我找不到原因。任何幫助將非常感激。崩潰的行是addPreferencesFromResources命令。

import android.os.Bundle; 
import android.preference.PreferenceActivity; 


public class PreferenceManager extends PreferenceActivity { 
    @SuppressWarnings("deprecation") 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     addPreferencesFromResource(R.xml.preferences); // This line crashes 
    } 
} 

preference.xml

<?xml version="1.0" encoding="utf-8"?> 
<Preference xmlns:android="http://schemas.android.com/apk/res/android" > 
       <CheckBoxPreference 
         android:title="@string/startAnimation" 
         android:defaultValue="true" 
         android:summary="@string/startAnimationDescription" 
         android:key="startAnimation" />  

</Preference> 

堆棧跟蹤

11-18 19:04:19.165: E/AndroidRuntime(1362): Uncaught handler: thread main exiting due to uncaught exception 
11-18 19:04:19.175: E/AndroidRuntime(1362): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.pearsonartphoto.psychictester/com.pearsonartphoto.psychictester.PreferenceManager}: java.lang.ClassCastException: android.preference.Preference 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at android.app.ActivityThread.access$2200(ActivityThread.java:119) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at android.os.Handler.dispatchMessage(Handler.java:99) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at android.os.Looper.loop(Looper.java:123) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at android.app.ActivityThread.main(ActivityThread.java:4363) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at java.lang.reflect.Method.invoke(Method.java:521) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at dalvik.system.NativeStart.main(Native Method) 
11-18 19:04:19.175: E/AndroidRuntime(1362): Caused by: java.lang.ClassCastException: android.preference.Preference 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at android.preference.GenericInflater.inflate(GenericInflater.java:320) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at android.preference.GenericInflater.inflate(GenericInflater.java:263) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at android.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:254) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at android.preference.PreferenceActivity.addPreferencesFromResource(PreferenceActivity.java:253) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at com.pearsonartphoto.psychictester.PreferenceManager.onCreate(PreferenceManager.java:12) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 
11-18 19:04:19.175: E/AndroidRuntime(1362):  ... 11 more 

Answer 1

的XML文件的頂級元素應該PreferenceScreen不偏好

<?xml version="1.0" encoding="utf-8"?> 
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"> 
    <CheckBoxPreference 
     android:key="pref_sync" 
     android:title="@string/pref_sync" 
     android:summary="@string/pref_sync_summ" 
     android:defaultValue="true" /> 
    <ListPreference 
     android:dependency="pref_sync" 
     android:key="pref_syncConnectionType" 
     android:title="@string/pref_syncConnectionType" 
     android:dialogTitle="@string/pref_syncConnectionType" 
     android:entries="@array/pref_syncConnectionTypes_entries" 
     android:entryValues="@array/pref_syncConnectionTypes_values" 
     android:defaultValue="@string/pref_syncConnectionTypes_default" /> 
</PreferenceScreen> 

從設置提取0