Validating IP in android
HI all, I am using simple socket communication between android(as client) and PC(as server). I am using EditText for Ip address. I want to Validate the IP address that is being entered in EditText field. Can please some one help me.. I am need of it. Thanks in advance.
Answers
If you are targeting API Level 8, you can use the Patterns.IP_ADDRESS global regex. You may directly include this regex in your project if you target device 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
}
Patterns.IP_ADDRESS.matcher(url).matches();
To check the IP as it's being entered you might want to use this instead:
private static final Pattern PARTIAl_IP_ADDRESS =
Pattern.compile("^((25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}|[1-9][0-9]|[0-9])\\.){0,3}"+
"((25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}|[1-9][0-9]|[0-9])){0,1}$");
ipEditText.addTextChangedListener(new TextWatcher() {
@Override public void onTextChanged(CharSequence s, int start, int before, int count) {}
@Override public void beforeTextChanged(CharSequence s,int start,int count,int after) {}
private String mPreviousText = "";
@Override
public void afterTextChanged(Editable s) {
if(PARTIAl_IP_ADDRESS.matcher(s).matches()) {
mPreviousText = s.toString();
} else {
s.replace(0, s.length(), mPreviousText);
}
}
});