Store and view list of whitelisted contacts
<p>What would be a simple way to store a list of contacts? I don't need to store much, just a unique identifier for each contact.
I'm picking my contacts by Intent.ACTION_PICK</p>

<p>Could this be done using build in contact groups? Can I create an invisible group and add contacts to that group?</p>

<p>A database and a loader seems a bit overkill... or is that just the way it's done?</p>

<p>The list of contacts will be presented to the user in a ListActivity or a ListFragment. And the entire app will pretty much be three views; whitelist, blacklist and pick contact. Filtering each view so any given contact only appears in one view (or list or group).</p>

<p>Any syggestions on how to go about this?</p>
