Android Preference 揭秘

我使用PreferenceActivity，请问如何删除Preference。这个不能正常运行

1. Preference p = findPreference("grok");
   
2. boolean worked = getPreferenceScreen().removePreference(p);
   
3. // worked == false.

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preference被找到了，但是removePreference() 调用失败了，请问该如何做呢。我使用 preference.xml 文件如下：

1. <PreferenceScreen
   
2. xmlns:android="http://schemas.android.com/apk/res/android">
   
3. 
   
4. <PreferenceCategory
   
5. android:title="foo">
   
6. 
   
7. <CheckBoxPreference
   
8. android:key="grok" />
   
9. 
   
10. ...

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XML:

1. <PreferenceScreen
   
2. xmlns:android="http://schemas.android.com/apk/res/android">
   
3. 
   
4. <PreferenceCategory
   
5. android:key="category_foo"
   
6. android:title="foo">
   
7. 
   
8. <CheckBoxPreference
   
9. android:key="grok" />
   
10. 
    
11. ...

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Code:

1. Preference p = findPreference("grok");
   
2. // removing Preference
   
3. ((PreferenceGroup) findPreference("category_foo")).removePreference(p);

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原文链接http://stackoverflow.com/questions/9348544/class-extends-listactivity-whose-id-attribute-is-android-r-id-list