How do you validate an IP address on Android?

Question

I am using simple socket communication between Android (as the client) and PC (as the server). I am having the user input the IP address into an EditText field and I want to validate the IP address. How do you validate an IP address on Android?

Answer 1

Patterns.IP_ADDRESS.matcher(url).matches(); 

Answer 2

API Level 8+:

You can use the Patterns.IP_ADDRESS global regex.

API Level 1-7:

You may directly include this regex in your project if you target devices with android < 2.2:

private static final Pattern IP_ADDRESS     = Pattern.compile(         "((25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}|[1-9][0-9]|[1-9])\\.(25[0-5]|2[0-4]"         + "[0-9]|[0-1][0-9]{2}|[1-9][0-9]|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1]"         + "[0-9]{2}|[1-9][0-9]|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}"         + "|[1-9][0-9]|[0-9]))"); Matcher matcher = IP_ADDRESS.matcher("127.0.0.1"); if (matcher.matches()) {     // ip is correct }