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：

<?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"            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>

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

</pre><pre name="code" class="html"><?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>    </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.PreferenceActivity;import android.preference.PreferenceManager;import android.util.Log;import android.widget.Toast;public class MainActivity extends PreferenceActivity {private MyOnSharedPreferenceChangeListener mOnSharedPreferenceChangeListener = new MyOnSharedPreferenceChangeListener();@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("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);}@Overrideprotected void onResume() {super.onResume();getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);}@Overrideprotected void onPause() {super.onPause();getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);}private class MyOnSharedPreferenceChangeListener implements OnSharedPreferenceChangeListener {@Overridepublic void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {Toast.makeText(getApplication(), key, Toast.LENGTH_SHORT).show();}}}

代码运行结果：

相关文档：
Android谷歌官方Settings开发文档：http://developer.android.com/guide/topics/ui/settings.html

更多相关文章

随机推荐