title: Android: How to pick multiple contacts
body: <p>I'm using this code to let the user choose a contact:</p>
  
  <pre><code>Intent contactPickerIntent = new Intent(Intent.ACTION_PICK, Phone.CONTENT_URI);  
  startActivityForResult(contactPickerIntent, 1001); 
  </code></pre>
  
  <p>but what I want to do is to let hime choose multiple contacts (with checkboxes).
  How can I do this ?</p>