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我有一个列表首选项，如下所示

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen  xmlns:android="http://schemas.android.com/apk/res/android" >
    <ListPreference android:key="userType"
                    android:title="User Type"
                    android:summary="This preference allows to select an item in a array"
                    android:defaultValue="Admin"
                    android:entries="@array/array_preference_userType"
                    android:entryValues="@array/array_preference_userTypeValues" />
</PreferenceScreen>

Prefs 类是

public class PreferencesActivity extends PreferenceActivity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     addPreferencesFromResource(R.xml.preference_user_settings);
 }
}

上面的课程在打开的时候被添加到活动组中。

Intent intent = new Intent(getParent(), PreferencesActivity.class);
ParentActivity parentActivity = (ParentActivity)getParent();
parentActivity.startChildActivity("PreferencesActivity", intent);

ParentActivity 类是：

public class ParentActivity extends ActivityGroup {
private ArrayList<String> mIdList;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);       
    if (mIdList == null) mIdList = new ArrayList<String>();
}

 public void startChildActivity(String Id, Intent intent) {     
     Window window = getLocalActivityManager().startActivity(Id,intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP));
      if (window != null) {
          Log.i("ParentActivity", "activity started: " + Id);
          mIdList.add(Id);
          setContentView(window.getDecorView()); 
      }    
  }
   }
}

但是当我单击列表首选项时，它会因错误而崩溃

E/AndroidRuntime(581): android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@44f862a8 is not valid; is your activity running?

我可能会想到一个添加父上下文的解决方案，这是我在创建意图时所做的。

有什么想法吗？

提前致谢！

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