title: Android Studio - How do I get documents from a sub-collection in Firestore?
body: <p>I would like to get documents in a sub-collection where the date=DATE and title=TITLE in a document. I'm using date and title as primary keys so that I can display information from the documents from sub-collection "bulletin". How would I do that in Android Studio?</p>
  
  <p>Or would it be better to use a different structure?</p>
  
  <p>Thanks!</p>
  
  <p><a href="https://i.stack.imgur.com/jO8FK.png" rel="nofollow noreferrer">Image - Firestore Structure</a></p>