Android之SharedPreference轻量级数据存储

android的配置文件

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.android_sharedpreference"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="9" />    <instrumentation android:targetPackage="com.example.android_sharedpreference" android:name="android.test.InstrumentationTestRunner"></instrumentation>    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <uses-library android:name="android.test.runner"></uses-library>        <activity            android:name="com.example.android_sharedpreference.MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

下面是操作代码

package com.example.android_sharedpreference;import java.util.HashMap;import java.util.Map;import android.content.Context;import android.content.SharedPreferences;public class MySharedpreference {private Context context;public MySharedpreference(Context context) {// TODO Auto-generated constructor stubthis.context = context;}public boolean saveMessage(String name,String pswd){boolean flag=false;SharedPreferences sharedPreferences=context.getSharedPreferences("userinfo", Context.MODE_PRIVATE);//对数据进行编辑SharedPreferences.Editor editor=sharedPreferences.edit();editor.putString("name",name);editor.putString("pswd", pswd);flag=editor.commit();//将数据持久化return flag;}public Map<String,Object>getMessage(){Map<String, Object>map=new HashMap<String, Object>();SharedPreferences sharedPreferences=context.getSharedPreferences("userinfo", Context.MODE_PRIVATE);String name=sharedPreferences.getString("name","");String pswd=sharedPreferences.getString("pswd", "");map.put("name", name);map.put("pswd",pswd);return map;}}

测试代码

import java.util.Map;import android.content.Context;import android.test.AndroidTestCase;import android.util.Log;public class MyTest extends AndroidTestCase {private String TAG="MyTest";public void save(){Context context=getContext();MySharedpreference mySharedpreference=new MySharedpreference(context);boolean flag=mySharedpreference.saveMessage("admin", "password");Log.i(TAG,"-->"+flag);}public void find(){Context context=getContext();MySharedpreference mySharedpreference=new MySharedpreference(context);  Map<String, Object> map=mySharedpreference.getMessage();  Log.i(TAG, map.toString());}}

在Android系统中，其配置文件的数据文件以XML文件的形式保存在/data/data/目录 /shared_prefs目录下

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