isFinishing method
<p><code>isFinishing()</code> method allows to check if <code>finish()</code> method was called or if the <code>Activity</code> is killed by the system.</p>

<p>What's the purpose of distinguishing these two scenarios? </p>

<p>What's the difference between calling <code>finish()</code> and killing the <code>Activity</code> by system?</p>
