What is it?

An Android port of Google's phonelibnumber library for parsing, formatting, and validating international phone numbers. It also can include offline geocode lookup. The Android version is optimized by using Assets, which are much quicker than ResourceStreams. It also includes a demo app.

Highlights of functionality

• Parsing, formatting, and validating phone numbers for all countries/regions of the world.
• getNumberType - gets the type of the number based on the number itself; able to distinguish Fixed-line, Mobile, Toll-free, Premium Rate, Shared Cost, VoIP, Personal Numbers, UAN, Pager, and Voicemail (whenever feasible).
• isNumberMatch - gets a confidence level on whether two numbers could be the same.
• getExampleNumber and getExampleNumberForType - provide valid example numbers for all countries/regions, with the option of specifying which type of example phone number is needed.
• isPossibleNumber - quickly guesses whether a number is a possible phone number by using only the length information, much faster than a full validation.
• isValidNumber - full validation of a phone number for a region using length and prefix information.
• AsYouTypeFormatter - formats phone numbers on-the-fly when users enter each digit.
• findNumbers - finds numbers in text.
• PhoneNumberOfflineGeocoder - provides geographical information related to a phone number.
• PhoneNumberToCarrierMapper - provides carrier information related to a phone number.
• PhoneNumberToTimeZonesMapper - provides timezone information related to a phone number.

Before you start

1. Add the following to the dependencies section of your module's build.gradle file;

   • If you only need phonelibnumber add; implementation 'com.lionscribe.open.libphonenumber:libphonenumber:8.12.18.1'
   • If you need phonelibnumber and offline-geocoder add; implementation 'com.lionscribe.open.libphonenumber:geocoder:8.12.18.1'
   • Do NOT add both!

2. In your code, you should call PhoneNumberUtil.init(context), before any call to getInstance(), preferably in the Application class. Alternately, you can use the getInstance(context) method.

Quick Examples

Let's say you have a string representing a phone number from Switzerland. This is how you parse/normalize it into a PhoneNumber object:

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());
}

At this point, swissNumberProto contains:

{
  "country_code": 41,
  "national_number": 446681800
}

PhoneNumber is a class that was originally auto-generated from phonenumber.proto with necessary modifications for efficiency. For details on the meaning of each field, refer to resources/phonenumber.proto.

Now let us validate whether the number is valid:

boolean isValid = phoneUtil.isValidNumber(swissNumberProto); // returns true

There are a few formats supported by the formatting method, as illustrated below:

// Produces "+41 44 668 18 00"
System.out.println(phoneUtil.format(swissNumberProto, PhoneNumberFormat.INTERNATIONAL));
// Produces "044 668 18 00"
System.out.println(phoneUtil.format(swissNumberProto, PhoneNumberFormat.NATIONAL));
// Produces "+41446681800"
System.out.println(phoneUtil.format(swissNumberProto, PhoneNumberFormat.E164));

You could also choose to format the number in the way it is dialed from another country:

// Produces "011 41 44 668 1800", the number when it is dialed in the United States.
System.out.println(phoneUtil.formatOutOfCountryCallingNumber(swissNumberProto, "US"));

Formatting Phone Numbers 'as you type'

PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();
AsYouTypeFormatter formatter = phoneUtil.getAsYouTypeFormatter("US");
System.out.println(formatter.inputDigit('6'));  // Outputs "6"
...  // Input more digits
System.out.println(formatter.inputDigit('3'));  // Now outputs "650 253"

Geocoding Phone Numbers

PhoneNumberOfflineGeocoder geocoder = PhoneNumberOfflineGeocoder.getInstance();
// Outputs "Zurich"
System.out.println(geocoder.getDescriptionForNumber(swissNumberProto, Locale.ENGLISH));
// Outputs "Zürich"
System.out.println(geocoder.getDescriptionForNumber(swissNumberProto, Locale.GERMAN));
// Outputs "Zurigo"
System.out.println(geocoder.getDescriptionForNumber(swissNumberProto, Locale.ITALIAN));

Mapping Phone Numbers to original carriers

Caveat: We do not provide data about the current carrier of a phone number, only the original carrier who is assigned the corresponding range. Read about number portability.

PhoneNumber swissMobileNumber =
    new PhoneNumber().setCountryCode(41).setNationalNumber(798765432L);
PhoneNumberToCarrierMapper carrierMapper = PhoneNumberToCarrierMapper.getInstance();
// Outputs "Swisscom"
System.out.println(carrierMapper.getNameForNumber(swissMobileNumber, Locale.ENGLISH));

More examples on how to use the library can be found in the unit tests.

Third-party Ports

We know that there is already an Android port at
https://github.com/MichaelRocks/libphonenumber-android, which does repackage
the metadata and use `AssetManager#open()`, but there are deficiencies in 
that port. First, it does not include an option for the GeoCoder and
is not compatible with the Google GeoCoder. Additionally, the developer chose
not to institute the Singleton instance method, and relies on the user to institute
it, which can lead to complications. We chose to include the Singleton instance, 
and we rely on developer to init it with the context.