PreferenceActivity 自动保存属性

package com.example.preference;

import android.content.Context;
import android.os.Bundle;
import android.preference.CheckBoxPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.Preference.OnPreferenceClickListener;
import android.widget.Toast;
  
public class MainActivity1 extends PreferenceActivity {
  
    Context mContext = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // 从资源文件中添Preferences ，选择的值将会自动保存到SharePreferences
    addPreferencesFromResource(R.xml.checkbox);
  
    mContext = this;
  
    //CheckBoxPreference组件
    CheckBoxPreference mCheckbox0 = (CheckBoxPreference) findPreference("checkbox_0");
    mCheckbox0.setOnPreferenceClickListener(new OnPreferenceClickListener() {
  
        @Override
        public boolean onPreferenceClick(Preference preference) {
        //这里可以监听到这个CheckBox 的点击事件
        return true;
        }
    });
  
    mCheckbox0.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
  
        @Override
        public boolean onPreferenceChange(Preference arg0, Object newValue) {
        //这里可以监听到checkBox中值是否改变了
        //并且可以拿到新改变的值
          Toast.makeText(mContext, "checkBox_0改变的值为" +  (Boolean)newValue, Toast.LENGTH_LONG).show();  
        return true;
        }
    });
  
    CheckBoxPreference mCheckbox1 = (CheckBoxPreference) findPreference("checkbox_1");
    mCheckbox1.setOnPreferenceClickListener(new OnPreferenceClickListener() {
  
        @Override
        public boolean onPreferenceClick(Preference preference) {
        //这里可以监听到这个CheckBox 的点击事件
        return true;
        }
    });
  
    mCheckbox1.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
  
        @Override
        public boolean onPreferenceChange(Preference arg0, Object newValue) {
        //这里可以监听到checkBox中值是否改变了
        //并且可以拿到新改变的值
          Toast.makeText(mContext, "checkBox_1改变的值为" +  (Boolean)newValue, Toast.LENGTH_LONG).show();  
        return true;
        }
    });
  
    }
  
}

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
  xmlns:android="http://schemas.android.com/apk/res/android">
    <PreferenceCategory android:title="CheckBoxPreference">   
    <CheckBoxPreference android:key="checkbox_0"
        android:title="CheckBox_A"
        android:summary="这是一个勾选框A" >
    </CheckBoxPreference>
  
    <CheckBoxPreference android:key="checkbox_1"
        android:title="CheckBox_B"
        android:summary="这是一个勾选框B" >
    </CheckBoxPreference>
    </PreferenceCategory>
</PreferenceScreen>