Android Preference 揭底

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.

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.             ...

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.         ...

Code:

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

复制代码

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