Android设置Settings实现：PreferenceActivity

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 print ?

<?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>
<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="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"?>

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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<?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>

<?xml version="1.0" encoding="utf-8"?>            成都        北京        上海

上层Java代码：

[java] view plain copy print ?

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();
@Override
protected 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);
}
@Override
protected void onResume() {
super.onResume();
getPreferenceScreen().getSharedPreferences()
.registerOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);
}
@Override
protected void onPause() {
super.onPause();
getPreferenceScreen().getSharedPreferences()
.unregisterOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);
}
private class MyOnSharedPreferenceChangeListener implements OnSharedPreferenceChangeListener {
@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
Toast.makeText(getApplication(), key, Toast.LENGTH_SHORT).show();
}
}
}

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

转载出处：http://blog.csdn.net/zhangphil

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