Android: Validate Phone Number Length by COUNTRY

How can we validate the length of a mobile number by COUNTRY? (Knowing that the country code might or might not be part of the number)

Length may vary per country, meaning there should be a length range or pattern validator.

Example:

• +1 222 2222 222 (13 digits) Valid ✔️
• 222 2222 222 (12 digits) Valid only if chosen in corresponding Locale ✔️
• +1 222 2222 2222222 (17 digits) Invalid ❌
• +1 222 2222 (8 digits) Invalid ❌

Note: Any idea where can I find each country's mobile number length range.

Thank you!

Given the mobile number and the country code, you can use libphonenumeer which is a Google library for validating phone numbers; it checks the number length and catches NumberParseException exception if it is not a right number.

This is their sample in how to use it

String swissNumberStr = "044 668 18 00";
PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();
try {
  PhoneNumber swissNumberProto = phoneUtil.parse(swissNumberStr, "CH");
} catch (NumberParseException e) {
  System.err.println("NumberParseException was thrown: " + e.toString());
}