标签：
1、SharedPreferences保存密码的文件
package com.itheima62.mobileguard.utils; import android.content.Context; import android.content.SharedPreferences; public class SpTools { public static void putString(Context context,String key,String value){ SharedPreferences sp = context.getSharedPreferences(MyConstants.SPFILE, Context.MODE_PRIVATE); sp.edit().putString(key, value).commit();//保存数据 } public static String getString(Context context,String key,String defValue){ SharedPreferences sp = context.getSharedPreferences(MyConstants.SPFILE, Context.MODE_PRIVATE); return sp.getString(key, defValue); } }
2、MD5加密
package com.itheima62.mobileguard.activities; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class Md5Utils { public static String md5(String str){ StringBuilder mess = new StringBuilder(); try { //获取MD5加密器 MessageDigest md = MessageDigest.getInstance("MD5"); byte[] bytes = str.getBytes(); byte[] digest = md.digest(bytes); for (byte b : digest){ //把每个字节转成16进制数 int d = b & 0xff;// 0x000000ff String hexString = Integer.toHexString(d); if (hexString.length() == 1) {//字节的高4位为0 hexString = "0" + hexString; } mess.append(hexString);//把每个字节对应的2位十六进制数当成字符串拼接一起 } } catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block e.printStackTrace(); } return mess + ""; } }
标签：
原文地址：http://www.cnblogs.com/wswbk/p/5280784.html
