title: Android: Manage contacts with lookup key
body: <p>I'm currently writing a application that allows to save drafts (using android version >= 2.0). Each draft is connected to a contact via the <code>ContactsContract.Contacts.LOOKUP_KEY</code>.
  My problem is that if I change the name of my contact the lookup key changes also. Is that the way this works?</p>
  
  <p>So for what do I need a lookup key? I thought that the lookup key does never change and now it changes anyway. I'm confused about that behavior ...</p>
  
  <p>Can someone explain to me how to link permanently to a contact? Should I use IDs instead of the lookup key?</p>
  
  <p>Thanks in advance.</p>