この設定クラスを使用しようとするたびにclassCastExceptionが発生しますが、その理由がわかりません。どんな助けでも大歓迎です。クラッシュする行はaddPreferencesFromResources
コマンドです。
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
}
}
Preferences.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>
スタックトレース
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