http://www.cnblogs.com/-cyb/archive/2011/07/01/Android_EmailFormat.html
protected void Check() {
if (USERNAME.equals("") || PASSWORD.equals("")) {
Toast.makeText(context, "账号或密码不能为空", Toast.LENGTH_SHORT)
.show();
} else if (!EmailFormat(USERNAME) || USERNAME.length() > 31) {
Toast.makeText(context, "账号不为邮箱或格式不正确", Toast.LENGTH_LONG)
.show();
} else if (PASSWORD.length() < 6 || PASSWORD.length() > 15) {
Toast.makeText(context, "密码长度应在6~15位!", Toa......
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