Translated from 日本語 • View original What is a phone number?
[Area Code] - [Area Code] - [Customer Number]
It has a structure that separates the number with two hyphens like this.
0312345678
This is surprisingly difficult to put a hyphen on a number that does not have a hyphen.
Sometimes the area code is 2 digits, sometimes 3 digits, sometimes 4 digits, and mobile phones are 3 digits, so it's too much to do on your own.
Area code section on Wikipedia
In such a case, let's sow something long, so we use the library provided by a reliable place.
The original Google had released a library.
libphonenumber
Basically, download the latest one, throw it into the libs of the Android project, and you're ready to go.
*Don't forget to check the library you want to export when creating an apk.
It is extremely easy to use.
[code lang="java" light="true"] /** * Convert a numeric phone number to a hyphened phone number * @param incomingNumber * @return Hyphened phone number */ private String getFormattedPhoneNumber(String incomingNumber) { PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance(); try { PhoneNumber pn = phoneUtil.parse(incomingNumber, "JP"); incomingNumber = phoneUtil.format(pn, PhoneNumberFormat.NATIONAL); } catch (NumberParseException e) { Log.e("app tag","Could not format phone number", e); } return incomingNumber; } }[/code]
I haven't tried it outside of Android, but I can use it with bare java... Maybe?