采用sharedPreference保存数据

 1 package com.example.login.service;
 2 
 3 import java.io.BufferedReader;
 4 import java.io.File;
 5 import java.io.FileInputStream;
 6 import java.io.FileNotFoundException;
 7 import java.io.FileOutputStream;
 8 import java.io.InputStreamReader;
 9 import java.util.HashMap;
10 import java.util.Map;
11 
12 import android.content.Context;
13 import android.content.SharedPreferences;
14 import android.content.SharedPreferences.Editor;
15 
16 public class LoginService {
17     public static void savaUserInfo(Context context, String username, String password)
18     {
19         SharedPreferences sp = context.getSharedPreferences("config", context.MODE_PRIVATE);
20         //获得一个sp编辑器
21         Editor editor = sp.edit();
22         editor.putString("username", username);
23         editor.putString("password", password);
24         //相当于事务的提交
25         editor.commit();
26     }
27     
28 
29 }

SharedPreferences sp = getSharedPreferences("config", MODE_PRIVATE);
        String username = sp.getString("username", "");
        String password = sp.getString("password", "");