[英]Why are my Android Preferences not updating?
我在xml文件中設置了一些首選項,並使用了標准結構(請參見下面的代碼)使它們可用和可更新,並且一切工作正常。 由於這些都是出於測試目的,因此我現在想用我的實際應用程序首選項(包括完全刪除一些首選項)替換它們,但是無論我做什么,似乎只能識別我設置的原始首選項。 我什至用我的新文件完全替換了xml文件-仍然只能找到舊的首選項。 我還清除了代碼中所示的條目(commit()之后映射大小為0)。 同樣,它似乎也不允許我從“ preferences.xml”更改xml文件名。 該代碼顯示了我的新名稱preferences_new.xml,但這在Eclipse中引發了錯誤。
在調用活動onCreate時:
// Display the fragment as the main content.
getFragmentManager().beginTransaction()
.replace(android.R.id.content, new PrefsFragment()).commit();
在PrefsFragment中:
PreferenceManager pm = this.getPreferenceManager();
SharedPreferences sp = pm.getSharedPreferences();
Editor e = sp.edit();
e.clear();
e.commit();
Map <String, ?> map = sp.getAll();
int size = map.size();
// Load the preferences from an XML resource
addPreferencesFromResource(R.xml.preferences_new);
舊的XML文件:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<PreferenceCategory android:title="@string/inline_preferences" >
<CheckBoxPreference
android:key="checkbox_preference"
android:summary="@string/summary_checkbox_preference"
android:title="@string/title_checkbox_preference" />
</PreferenceCategory>
<PreferenceCategory android:title="@string/dialog_based_preferences" >
<EditTextPreference
android:dialogTitle="@string/dialog_title_edittext_preference"
android:key="edittext_preference"
android:summary="@string/summary_edittext_preference"
android:title="@string/title_edittext_preference" />
<ListPreference
android:dialogTitle="@string/dialog_title_list_preference"
android:entries="@array/entries_list_preference"
android:entryValues="@array/entryvalues_list_preference"
android:key="list_preference"
android:summary="@string/summary_list_preference"
android:title="@string/title_list_preference" />
</PreferenceCategory>
<PreferenceCategory android:title="@string/launch_preferences" >
<!--
This PreferenceScreen tag serves as a screen break (similar to page break
in word processing). Like for other preference types, we assign a key
here so it is able to save and restore its instance state.
-->
<PreferenceScreen
android:key="screen_preference"
android:summary="@string/summary_screen_preference"
android:title="@string/title_screen_preference" >
<!-- You can place more preferences here that will be shown on the next screen. -->
<CheckBoxPreference
android:key="next_screen_checkbox_preference"
android:summary="@string/summary_next_screen_toggle_preference"
android:title="@string/title_next_screen_toggle_preference" />
</PreferenceScreen>
<PreferenceScreen
android:summary="@string/summary_intent_preference"
android:title="@string/title_intent_preference" >
<intent
android:action="android.intent.action.VIEW"
android:data="http://www.android.com" />
</PreferenceScreen>
</PreferenceCategory>
<PreferenceCategory android:title="@string/preference_attributes" >
<CheckBoxPreference
android:key="parent_checkbox_preference"
android:summary="@string/summary_parent_preference"
android:title="@string/title_parent_preference" />
<!-- The visual style of a child is defined by this styled theme attribute. -->
<CheckBoxPreference
android:dependency="parent_checkbox_preference"
android:key="child_checkbox_preference"
android:layout="?android:attr/preferenceLayoutChild"
android:summary="@string/summary_child_preference"
android:title="@string/title_child_preference" />
</PreferenceCategory>
新的xml文件:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<PreferenceCategory android:title="@string/inline_preferences" >
<CheckBoxPreference
android:defaultValue="false"
android:key="checkbox_preference"
android:summary="@string/summary_checkbox_preference"
android:title="@string/title_checkbox_preference" />
</PreferenceCategory>
<PreferenceCategory android:title="@string/dialog_based_preferences"
android:key="edittext_category" >
<EditTextPreference
android:id="@+id/my_phone"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:defaultValue=""
android:dialogTitle="@string/dialog_title_edittext_preference"
android:inputType="phone"
android:key="edittext_preference"
android:maxLines="1"
android:selectAllOnFocus="true"
android:singleLine="true"
android:summary="@string/summary_edittext_preference"
android:title="@string/title_edittext_preference" />
</PreferenceCategory>
我幾乎處於“拔頭發”階段,因此對您的幫助將不勝感激
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