A protected address book for Android - how to make one

Many apps that get installed on an Android tablet or phone take a keen interest in the system address book. It is a place where Google can check your Facebook contacts and vice versa, and where Microsoft (in the shape of Skype) and many smaller companies also can take a stab at analyzing your social network.

There have been attempts at protecting the system address book from prying eyes, but as far as I know there are no simple up-to-date solutions.

So the obvious solution ought to be instead to create an app that is your address book, your real address book with its own database and hence with your contacts stored away from the system address book.

Someone ought to make such an app, and it cannot be that hard to do. Let's call it the Protected Address Book. It should be open source of course or we are back in the morass.

Initiating communication from the Protected Address Book

Many communication apps surely rely on the system address book for pulling contact information out, but it ought to be possible to initiate communication from the Protected Address Book, similar to a share button (or indeed use that one). In order to get around idiosyncracies of different apps, a plug-in system could be in place to get the right behavior from Gmail, Telegram, WhatsApp, Facebook, Skype and other apps.

Anyone up for getting the Protected Address Book rolling?