Saving Data on Android

PostDetailsActivity.kt
 and navigate to 
listenForComments()
. Replace 
the 
TODO
 inside the function with the following:
cloudFirestoreManager.onCommentsValuesChange(post.id) 
    .observe(
this
, Observer(::onCommentsUpdate))
Here, you start listening for the comments changes for that particular post and when 
the data changes you update the UI.
Go back to the 
CloudFirestoreManager.kt
 class and navigate to 
stopListeningForCommentsChanges()
. Replace the function with the following:
fun
 
stopListeningForCommentsChanges
()
 = 
commentsRegistration.remove()
Here, you remove the listener from the location that you assigned to the 
commentsRegistration
.
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