Extract code country from phone number [libphonenumber]

问题

I have a string like this : +33123456789 (french phone number). I want to extract the country code (+33) without knowing the country. For example, it should work if i have another phone from another country. I use the google library https://code.google.com/p/libphonenumber/.

If I know the country, it is cool I can find the country code :

PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();
int countryCode = phoneUtil.getCountryCodeForRegion(locale.getCountry());

but I don\'t find a way to parse a string without to know the country.

回答1:

Okay, so I've joined the google group of libphonenumber ( https://groups.google.com/forum/?hl=en&fromgroups#!forum/libphonenumber-discuss ) and I've asked a question.

I don't need to set the country in parameter if my phone number begins with "+". Here is an example :

PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();
try {
    // phone must begin with '+'
    PhoneNumber numberProto = phoneUtil.parse(phone, "");
    int countryCode = numberProto.getCountryCode();
} catch (NumberParseException e) {
    System.err.println("NumberParseException was thrown: " + e.toString());
}

回答2:

In here you can save the phone number as international formatted phone number

internationalFormatPhoneNumber = phoneUtil.format(givenPhoneNumber, PhoneNumberFormat.INTERNATIONAL);

it return the phone number as International format +94 71 560 4888

so now I have get country code as this

String countryCode = internationalFormatPhoneNumber.substring(0,internationalFormatPhoneNumber.indexOf('')).replace('+', ' ').trim();

Hope this will help you

回答3:

One of our clients had a similar issue and not all their phone numbers started with "+". But it's still often possible to guess the country, based on the phone number formatting ... for example 06 XX XX XX XX looks like a French mobile number. It could be something else but it's works trying to validate to a French number and see if libphonenumber could verify positively.

Also this client was using the contact's name likely country of origin, to try and prioritize which country to try to validate to. For example, with an Italian name, they would try and validate to an Italian phone number.

We've added that country code detection to libphonenumber and made a free API combining the personal name, as well as the phone number formatting (the prefix, how many digits, how many spaces, if there is a dash or a parenthesis etc.)

It can be tried online here https://apiphonenumber.com/

It will work with numbers that start with "+" but 95% of the time it will work with other locally formatted number too.

回答4:

I have got kept a handy helper method to take care of this based on one answer posted above:

Imports:

import com.google.i18n.phonenumbers.NumberParseException
import com.google.i18n.phonenumbers.PhoneNumberUtil

Function:

    fun parseCountryCode( phoneNumberStr: String?): String {
        val phoneUtil = PhoneNumberUtil.getInstance()
        return try {
            // phone must begin with '+'
            val numberProto = phoneUtil.parse(phoneNumberStr, "")
            numberProto.countryCode.toString()
        } catch (e: NumberParseException) {
            ""
        }
    }

回答5:

If the string containing the phone number will always start this way (+33 or another country code) you should use regex to parse and get the country code and then use the library to get the country associated to the number.

回答6:

Here's a an answer how to find country calling code without using third-party libraries (as real developer does):

Get list of all available country codes, Wikipedia can help here: https://en.wikipedia.org/wiki/List_of_country_calling_codes

Parse data in a tree structure where each digit is a branch.

Traverse your tree digit by digit until you are at the last branch - that's your country code.

来源：https://stackoverflow.com/questions/16809508/extract-code-country-from-phone-number-libphonenumber

标签

android

libphonenumber