要求； 1.当用户名输入email后，需要用正则表达式验证邮箱格式是否正确，如果不正确，需要用toast提示用户输入的格式不对； 2.当用户输入密码后，需要验证长度在8-12位，否则需要用toast提示用户密度长度不足； 3.用户名和密码保存在二维数组中，第一列是用户名，第二列是密码，当用户点击登录，需要遍历二维数组，看看是否有匹配的用户名和密码； 4.当用户登录成功后，使用 i te t 跳转到一个主界面，代表登录成功，在该主界面使用一个 TextView 显示用户登录进入到时间； 5.额外的，使用一个特殊用户名和密码，例如 Admin，登录进入一个管理界面，可以显示出所有的用户名和密码
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