How do I update my phone number validation function to validate only US phone numbers?

Question

I have a generic phone number validation function that currently validates all global phone numbers. I wanted to update it so that it only validates US phone numbers. But the problem with that is currently even if i set my phone number length to 10, it will stop short at exactly 10 characters. my users may enter something like a space or a ( ,for example : "(444)444 4444 , which wont work if i limit the number of chars to 10 even if its a valid number.Any ideas how to go about it? here's my function :

public static boolean isValidPhoneNumber(String phoneNumber) {
    return !TextUtils.isEmpty(phoneNumber) && android.util.Patterns.PHONE.matcher(phoneNumber).matches() && PhoneNumberUtils.;
}

Post your code relevant to your explanation for updating existing code. — Ravi, Apr 05 '19 at 15:19
I would recommend using `TextWatcher` for this kind of things. — Khojiakbar, Apr 05 '19 at 15:20
@MarissaNicholas You can look at this post to make your own `TextWatcher` that will format text as you want https://stackoverflow.com/questions/16975304/automatically-add-dash-in-phone-number-in-android — Khojiakbar, Apr 05 '19 at 15:25
How do the users set their phone numbers? If you use an EditText for that add the attribute android:inputType="phone" on the layout and the users will only be able to enter numbers. — Nikos Hidalgo, Apr 05 '19 at 15:52

score 0 · Accepted Answer · answered Apr 05 '19 at 16:34

The best way i think would be to use https://github.com/MichaelRocks/libphonenumber-android.

You can include it in your project as following:

repositories {
  jcenter()
}

dependencies {
  implementation 'io.michaelrocks:libphonenumber-android:8.10.7'
}

And then use it like:

public void validateNumber(View view) {
        PhoneNumberUtil phoneNumberUtil = PhoneNumberUtil.createInstance(this);
        Phonenumber.PhoneNumber phoneNumber = null;
        try {

            phoneNumber = phoneNumberUtil.parse("(541) 754-3010"/*replace with your number*/, "US");
            boolean isValid = phoneNumberUtil.isValidNumber(phoneNumber);
            Toast.makeText(this, "" + isValid, Toast.LENGTH_SHORT).show();
        } catch (NumberParseException e) {
            e.printStackTrace();
        }
    }

How do I update my phone number validation function to validate only US phone numbers?

1 Answers1