title: Sending data back to the Main Activity in Android
body: <p>I have two activities: main activity and child activity.<br>
  When I press a button in the main activity, the child activity is launched. </p>
  
  <p>Now I want to send some data back to the main screen. I used the Bundle class, but it is not working. It throws some runtime exceptions.</p>
  
  <p>Is there any solution for this? </p>