Android数据存储------2 共享参数

为了更好地验证代码，我们首先改变AndroidManifest.xml，加入单元测试

1   <instrumentation
2         android:name="android.test.InstrumentationTestRunner"
3         android:targetPackage="com.yxh.androidshareprefences01" >
4     </instrumentation>

并在 <application>内添加<uses-library android:name="android.test.runner" />

1  <application
2         android:allowBackup="true"
3         android:icon="@drawable/ic_launcher"
4         android:label="@string/app_name"
5         android:theme="@style/AppTheme" >
6         <uses-library android:name="android.test.runner" />

然后进行正式的编码：
第一步：编写MySharedPreferences01类用于存读文件

 1 package com.yxh.androidshareprefences01;
 2
 3
 4 import java.util.HashMap;
 5 import java.util.Map;
 6
 7 import android.app.Activity;
 8 import android.content.Context;
 9 import android.content.SharedPreferences;
10
11 public class MyShareprefences01 {
12     private Context context;
13
14     //构造方法
15     public MyShareprefences01(Context context) {
16         this.context=context;
17
18     }
19     //创建存放信息的方法
20     public boolean saveShareprefences(String name,String age){
21         boolean flag=false;
22         //实例化SharedPreferences
23         SharedPreferences share=context.getSharedPreferences("info",Activity.MODE_PRIVATE);
24         //调用SharedPreferences下的接口，进行写入
25         SharedPreferences.Editor editor=share.edit();
26         //写入信息
27         editor.putString("name",name);
28         editor.putString("age", age);
29         //提交信息，让数据持久化
30         editor.commit();
31         flag=true;
32         return flag;
33     }
34     public Map<String ,String >  readShareprefences(){
35         //实例化map用于接收信息
36         Map<String ,String > map=new HashMap<String, String>();
37         //实例化SharedPreferences
38         SharedPreferences share=context.getSharedPreferences("info",Activity.MODE_PRIVATE);
39         //根据KEY值取得信息
40         String name=share.getString("name", "没有");
41         String age=share.getString("age","0");
42         //把取得的信息存入map
43         map.put("name",name);
44         map.put("age", age);
45
46         return map;
47     }
48
49
50 }

第二步，进行代码测试

 1 package com.yxh.androidshareprefences01;
 2
 3 import java.util.Map;
 4
 5 import android.app.Activity;
 6 import android.content.Context;
 7 import android.content.SharedPreferences;
 8 import android.test.AndroidTestCase;
 9 import android.util.Log;
10
11 public class MyTest extends AndroidTestCase {
12     private static String  TAG="MyTest";
13
14     public MyTest() {
15         // TODO Auto-generated constructor stub
16     }
17     //对数据保存数据测试
18     public void saveShareprefences(){
19        Context context=getContext();
20        MyShareprefences01 share=new MyShareprefences01(context);
21        boolean flag=share.saveShareprefences("neusoft", "100");
22        Log.i(TAG,"---->>"+flag);
23     }
24     //对读取数据测试
25     public void readShareprefences(){
26            Context context=getContext();
27            MyShareprefences01 share=new MyShareprefences01(context);
28            Map<String,String> map=share.readShareprefences();
29            Log.i(TAG,"---->>"+map.toString());
30         }
31
32 }

测试结果：

1 10-26 01:55:58.876: I/MyTest(3401): ---->>true
2 10-26 02:02:42.716: I/MyTest(5120): ---->>{age=100, name=neusoft}