title: How to transfer data between two children activities in android?
body: <p>I have 3 Activities:
  1 Parent and 2 children. Let's call them simply Activity1, Activity2a and Activity2b;</p>
  
  <p>Activity2a and Activity2b are both started from Activity1. How can I transfer data from Activity2a to Activity2b through the parent? Any ideas? I think I have to use intents but don't know how.</p>