Google's phone number handling library
Not entirely sure how this made front page, but it is a super handy lib.<p>I don't understand why Android includes this lib in their source but makes it internal so you have to provide your own copy if you want to use it in your app:
<a href="https://android.googlesource.com/platform/external/libphonenumber/" rel="nofollow">https://android.googlesource.com/platform/external/libphonen...</a>