package com.example.login.service;

 import java.io.BufferedReader;

 import java.io.File;

 import java.io.FileInputStream;

 import java.io.FileNotFoundException;

 import java.io.FileOutputStream;

 import java.io.InputStreamReader;

 import java.util.HashMap;

 import java.util.Map;

 import android.content.Context;

 import android.content.SharedPreferences;

 import android.content.SharedPreferences.Editor;

 public class LoginService {

     public static void savaUserInfo(Context context, String username, String password)

     {

         SharedPreferences sp = context.getSharedPreferences("config", context.MODE_PRIVATE);

         //获得一个sp编辑器

         Editor editor = sp.edit();

         editor.putString("username", username);

         editor.putString("password", password);

         //相当于事务的提交

         editor.commit();

     }

 }

SharedPreferences sp = getSharedPreferences("config", MODE_PRIVATE);

        String username = sp.getString("username", "");

        String password = sp.getString("password", "");