你好博主,在你“Android开发-在Android应用里实现自动发送邮件的功能”这篇文章中,SendMailUtil.java类中
String HOST = ShareUtils.getString(MyApplication.getInstance(), "HOST", "");
String PORT = ShareUtils.getString(MyApplication.getInstance(), "PORT", "");
String FROM_ADD = ShareUtils.getString(MyApplication.getInstance(), "FROM_ADD", "");
String FROM_PSW = ShareUtils.getString(MyApplication.getInstance(), "FROM_PSW", "");
这一段ShareUtils,MyApplication我都没有,可以麻烦教一教吗