Android设置Settings：ListPreference【3】

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原博：http://blog.csdn.net/zhangphil

Android设置Settings：ListPreference【3】

Android的Settings实现中，ListPreference使用稍微复杂些，ListPreference使用两个数据源：entries和entryValues，entries和entryValues存在对应关系，可以这么简单理解，entries是人类可读的有意义的内容，而entryValues则是用来为机器或代码使用的具体的值，在前面文章【1】和【2】的基础写一个ListPreference的使用加以说明。
res/xml目录下的preferences.xml(有变化):

<?xml version="1.0" encoding="utf-8"?><PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >    <PreferenceCategory android:title="【第1组】" >        <ListPreference            android:dialogTitle="list dialog title"            android:entries="@array/citys"            android:entryValues="@array/citys_code"            android:key="list_key"            android:summary="list summary"            android:title="list title" />    </PreferenceCategory>    <PreferenceCategory android:title="【第2组】" >        <EditTextPreference            android:defaultValue="缺省值1"            android:key="edit_text_key_1"            android:summary="edit summary"            android:title="edit text 1" />        <CheckBoxPreference            android:defaultValue="true"            android:key="checkbox_key"            android:summary="checkbox summary"            android:title="checkbox title" />    </PreferenceCategory>    <!-- 点击将浏览和打开网页 -->    <Preference        android:summary="http://blog.csdn.net/zhangphil"        android:title="浏览网页" >        <intent            android:action="android.intent.action.VIEW"            android:data="http://blog.csdn.net/zhangphil" />    </Preference>    <!-- 此处将跳转到下一屏设置 -->    <PreferenceScreen        android:key="preference_screen_2_key"        android:persistent="false"        android:title="PreferenceScreen 2" >        <EditTextPreference            android:defaultValue="缺省值2"            android:key="edit_text_key_2"            android:summary="edit summary"            android:title="edit text 2" />    </PreferenceScreen></PreferenceScreen><?xml version="1.0" encoding="utf-8"?><PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >    <PreferenceCategory android:title="【第1组】" >        <ListPreference            android:dialogTitle="list dialog title"            android:entries="@array/citys"            android:entryValues="@array/citys_code"            android:key="list_key"            android:summary="list summary"            android:title="list title" />    </PreferenceCategory>    <PreferenceCategory android:title="【第2组】" >        <EditTextPreference            android:defaultValue="缺省值1"            android:key="edit_text_key_1"            android:summary="edit summary"            android:title="edit text 1" />        <CheckBoxPreference            android:defaultValue="true"            android:key="checkbox_key"            android:summary="checkbox summary"            android:title="checkbox title" />    </PreferenceCategory>    <!-- 点击将浏览和打开网页 -->    <Preference        android:summary="http://blog.csdn.net/zhangphil"        android:title="浏览网页" >        <intent            android:action="android.intent.action.VIEW"            android:data="http://blog.csdn.net/zhangphil" />    </Preference>    <!-- 此处将跳转到下一屏设置 -->    <PreferenceScreen        android:key="preference_screen_2_key"        android:persistent="false"        android:title="PreferenceScreen 2" >        <EditTextPreference            android:defaultValue="缺省值2"            android:key="edit_text_key_2"            android:summary="edit summary"            android:title="edit text 2" />    </PreferenceScreen></PreferenceScreen>

需要的res/values/arrays.xml（注意变化）:

<?xml version="1.0" encoding="utf-8"?><resources>    <string-array name="citys">        <item>成都</item>        <item>北京</item>        <item>上海</item>    </string-array>         <string-array name="citys_code">        <item>028</item>        <item>010</item>        <item>021</item>    </string-array>    </resources>

上层Java代码：

package zhangphil.settings;import android.content.SharedPreferences;import android.content.SharedPreferences.OnSharedPreferenceChangeListener;import android.os.Bundle;import android.preference.EditTextPreference;import android.preference.ListPreference;import android.preference.Preference;import android.preference.PreferenceActivity;import android.preference.PreferenceManager;import android.preference.PreferenceScreen;public class MainActivity extends PreferenceActivity {private MyOnSharedPreferenceChangeListener mOnSharedPreferenceChangeListener = new MyOnSharedPreferenceChangeListener();private EditTextPreference mEditTextPreference;private final String A_KEY = "edit_text_key_1";private ListPreference mListPreference;private final String LIST_KEY = "list_key";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// 通用的读取设置的某个值的方法SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);String s = sharedPreferences.getString(A_KEY, "暂时为空");// 添加设置的选项addPreferencesFromResource(R.xml.preferences);// 预读取。为PreferenceActivity中的某个设置选项初始化值mEditTextPreference = (EditTextPreference) findPreference(A_KEY);mEditTextPreference.setSummary(s);// 注册添加设置的项数据发生变化时候的监听sharedPreferences.registerOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);mListPreference = (ListPreference) findPreference(LIST_KEY);}@Overrideprotected void onResume() {super.onResume();getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);}@Overrideprotected void onPause() {super.onPause();getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);}// 那一个设置选项栏被触发@Overridepublic boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {return false;}private class MyOnSharedPreferenceChangeListener implements OnSharedPreferenceChangeListener {@Overridepublic void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {if (key.equals(A_KEY)) {// 更新String s = sharedPreferences.getString(A_KEY, "NULL");mEditTextPreference.setSummary(s);}if (key.equals(LIST_KEY)) {String e = mListPreference.getEntry() + "";String v = mListPreference.getValue();mListPreference.setSummary(e + " : " + v);}}}}

运行结果：

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