Does android clear/remove all user preference during upgrade?
<p>Can you please does android clear/remove all user preference during upgrade?</p>

<ol>
<li>upgrade my apk from market</li>
<li>upgrade my apk from command line 'adb install'</li>
<li>upgrade my apk by clicking a link contains the apk</li>
<li>upgrade when I debug it via eclipse</li>
</ol>
