title: How run specific function from activity which is reordering to front
body: <p>I am a beginner in programming and also in Android development.</p>
  
  <p>I have 2 <code>Activities</code> with the flag <code>ACTIVITY_REORDER_TO_FRONT</code> and I need to retain both <code>Activities</code>, so I cannot use <code>startActivityForResult(...)</code> because cannot use <code>finish()</code>.</p>
  
  <p>I use an <code>AsyncTask</code> to retrieve data from a server in both <code>Activities</code>. This data updates content in my <code>Activity</code>. </p>
  
  <p>How could I start this <code>AsyncTask</code> immediately after reordering the <code>Activity</code> to front?</p>