采用sharedPreference保存数据

1、sharedPreference保存数据

 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();
     }

 }

2、sharedPreference读取数据

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