FirebaseListAdapter not pushing individual items for chat app - Firebase-Ui 3.1

Question

I am making a chat app on Android that uses google firebase to store messages that users write to each other. To display these messages to the users I read them from the dat

Answer 1

In addition to what's been said in Peter's answer, according to FirebaseRecyclerAdapater latest api documentation, you can create a FirebaseRecyclerAdapter passing in a FirebaseRecyclerOptions instance which is created by a builder. In the builder you specify a lifecycle owner so you don't have to modify either its onStart or its onStop manually:

private fun MainActivity.setUpFirebaseRecyclerAdapter():
    FirebaseRecyclerAdapter {

val options = FirebaseRecyclerOptions.Builder()
        .setQuery(ONLINE_USERS.limitToLast(10), User::class.java)
        .setLifecycleOwner(this)
        .build()

return object : FirebaseRecyclerAdapter(options){
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ListOnlineViewHolder {
        return ListOnlineViewHolder(
                LayoutInflater.from(parent.context)
                        .inflate(R.layout.user_layout, parent, false))
    }
    override fun onBindViewHolder(holder: ListOnlineViewHolder, position: Int, model: User) {
        holder.bindMessage(model)
    }
}
}

The options builder is made up of a setQuery method which takes in a reference to the db and a model object; the setLifecycleOwner which takes in the activity that will trigger the adapter updates.