问题整理三

DialogFragment的返回键处理

因为没有直接的复写方式,有两个方式都可以实现

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    return new Dialog(getActivity(), getTheme()){
        @Override
        public void onBackPressed() {
            // On backpress, do your stuff here.
        }
    };
}

@Override
public void onResume() {
    super.onResume();
    Dialog dialog = getDialog();
    if (dialog != null) {
        dialog.setOnKeyListener(this);
    }
}

@Override
public void onPause() {
    super.onPause();
    Dialog dialog = getDialog();
    if (dialog != null) {
        dialog.setOnKeyListener(null);
    }
}

chmod

用法：chmod XXX filename ×××（所有者\组用户\其他用户） ×=4 读的权限 ×=2 写的权限 ×=1 执行的权限 常用修改权限的命令：

sudo chmod 600 ××× （只有所有者有读和写的权限）
sudo chmod 644 ××× （所有者有读和写的权限，组用户只有读的权限）
sudo chmod 700 ××× （只有所有者有读和写以及执行的权限）
sudo chmod 666 ××× （每个人都有读和写的权限）
sudo chmod 777 ××× （每个人都有读和写以及执行的权限） 

javax.net.ssl.SSLHandshakeException: Invalid input to toASCII

项目之前给的一些域名包含了_,在https中报错了,解决办法就是去掉,以前只知道不适合用,现在记录一下原因

From Restrictions_on_valid_host_names

Hostnames are composed of series of labels concatenated with dots, as are all domain names. For example, “en.wikipedia.org” is a hostname. Each label must be between 1 and 63 characters long,[2] and the entire hostname (including the delimiting dots but not a trailing dot) has a maximum of 253 ASCII characters.[3]

The Internet standards for protocols mandate that component hostname labels may contain only the ASCII letters ‘a’ through ‘z’ (in a case-insensitive manner), the digits ‘0’ through ‘9’, and the hyphen (‘-‘). The original specification of hostnames in RFC 952, mandated that labels could not start with a digit or with a hyphen, and must not end with a hyphen. However, a subsequent specification (RFC 1123) permitted hostname labels to start with digits. No other symbols, punctuation characters, or white space are permitted.

While a hostname may not contain other characters, such as the underscore character (_), other DNS names may contain the underscore. or from http://domainkeys.sourceforge.net/underscore.html

Underscores allowed, except in host names

Host names are not allowed to have underscores in them. In DNS, host names are the name fields of A or MX records or the data fields of the SOA and NS records. Thus, there are many DNS entries that are not hostnames. Summary: you cannot use underscores in a host name. You shouldn’t want to either.

http://stackoverflow.com/questions/10959757/the-use-of-the-underscore-in-host-names