Get unique Id for the current user
<p>How can I get a unique Id for the current user who is using my application? </p>

<p>I don't want to retrieve the <code>device UDID</code> (for my users privacy concerns).</p>

<p>I saw once that in the latest API versions (4.0+) there is such method to generate a unique 
id for the current android user, but I cannot find it now.</p>
