Display a list of contact as I type name OR phone number in the input box
<p>I would want to display a list of contact as the user type in the input box.</p>

<p>How can I programmed to display it?</p>

<p>I know I need to add a permission, "READ CONTACT".</p>

<p>The most important is do I need to use Multi-Threading(Async Tasks)?</p>
