Android设置Settings实现：PreferenceActivity【1】

Android设置Settings实现：PreferenceActivity【1】

Android的设置Settings功能比较常见，通常可以考虑使用PreferenceActivity实现。

PreferenceActivity需要从res/xml加载（addPreferencesFromResource）一个定义好的Preference的xml文件。比如preferences.xml：

[html] view plain copy

<?xmlversion="1.0"encoding="utf-8"?>
<PreferenceScreenxmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategoryandroid:title="【第1组】">
<ListPreference
android:dialogTitle="listdialogtitle"
android:entries="@array/citys"
android:entryValues="@array/citys"
android:key="list_key"
android:summary="listsummary"
android:title="listtitle"/>
</PreferenceCategory>
<PreferenceCategoryandroid:title="【第2组】">
<EditTextPreference
android:defaultValue="缺省值1"
android:key="edit_text_key_1"
android:summary="editsummary"
android:title="edittext1"/>
<CheckBoxPreference
android:defaultValue="true"
android:key="checkbox_key"
android:summary="checkboxsummary"
android:title="checkboxtitle"/>
</PreferenceCategory>
<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>
<PreferenceScreen
android:key="preference_screen_2_key"
android:persistent="false"
android:title="PreferenceScreen2">
<EditTextPreference
android:defaultValue="缺省值2"
android:key="edit_text_key_2"
android:summary="editsummary"
android:title="edittext2"/>
</PreferenceScreen>
</PreferenceScreen>

其中需要的数组资源citys在res/values中的arrays.xml中定义好：

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<?xmlversion="1.0"encoding="utf-8"?>
<resources>
<string-arrayname="citys">
<item>成都</item>
<item>北京</item>
<item>上海</item>
</string-array>
</resources>

上层Java代码：

[java] view plain copy

packagezhangphil.settings;
importandroid.content.SharedPreferences;
importandroid.content.SharedPreferences.OnSharedPreferenceChangeListener;
importandroid.os.Bundle;
importandroid.preference.PreferenceActivity;
importandroid.preference.PreferenceManager;
importandroid.util.Log;
importandroid.widget.Toast;
publicclassMainActivityextendsPreferenceActivity{
privateMyOnSharedPreferenceChangeListenermOnSharedPreferenceChangeListener=newMyOnSharedPreferenceChangeListener();
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
//通用的读取设置的某个值的方法
SharedPreferencessharedPreferences=PreferenceManager.getDefaultSharedPreferences(this);
Strings=sharedPreferences.getString("edit_text_key_2","暂时为空");
Log.d("edit_text_key_2",s);
//添加设置的选项
addPreferencesFromResource(R.xml.preferences);
//注册添加设置的项数据发生变化时候的监听
sharedPreferences.registerOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);
}
@Override
protectedvoidonResume(){
super.onResume();
getPreferenceScreen().getSharedPreferences()
.registerOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);
}
@Override
protectedvoidonPause(){
super.onPause();
getPreferenceScreen().getSharedPreferences()
.unregisterOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);
}
privateclassMyOnSharedPreferenceChangeListenerimplementsOnSharedPreferenceChangeListener{
@Override
publicvoidonSharedPreferenceChanged(SharedPreferencessharedPreferences,Stringkey){
Toast.makeText(getApplication(),key,Toast.LENGTH_SHORT).show();
}
}
}

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