 <p>It looks like your stack is empty do you use Intent Flags? Try a look here <a href="http://developer.android.com/guide/components/tasks-and-back-stack.html" rel="nofollow">http://developer.android.com/guide/components/tasks-and-back-stack.html</a> </p> <p>if ya have just one Activity override the OnBackPress event and do your thing just return or something.</p> <pre><code>@Override public void onBackPressed() { return; } </code></pre> <p>Xamarin People:</p> <pre><code> public override void OnBackPressed() { base.OnBackPressed(); return; } </code></pre>