I am building a chat app with Firebase and MVVM.
I built a feature to show if the user is online or offline. I observe the app lifeCycle and updating the value in the user real time database under the key: "status".
So I have a recyclerview that displays all the user's recent chats, and I am observing each user data. When the user logout or exit the app the "status" is updated . The goal is to update the recyclerView row and change the online icon to the offline icon.
Right now I am doing it through the adapter class.
First I set the list like below:
fun setUserList(newList: List<LinkedHashMap<String, Any?>>?, context: Context) {
if (this::theUserList.isInitialized) {
(theUserList as ArrayList<LinkedHashMap<String, Any?>>).clear()
}
if(!::lifecycleOwner.isInitialized){
lifecycleOwner = context as LifecycleOwner
}
if (newList != null) {
// Remove Duplicates Users
val hs = LinkedHashSet<LinkedHashMap<String, Any?>>()
hs.addAll(newList)
(newList as ArrayList<LinkedHashMap<String, Any?>>)
newList.clear()
newList.addAll(hs)
val sortedList = newList.sortedByDescending { it["Messages"].toString().toInt() }
theUserList = sortedList
notifyDataSetChanged()
if (theUserList != null) {
for (user in theUserList.indices){
val userPosition : Int = user
val userHashMap : HashMap<String, Any?> = theUserList[userPosition]
val userDetails: User = userHashMap["Sender"] as User
mainRepository.checkUserStatus(userDetails.uid).observe(lifecycleOwner){
updateUserStatus(userPosition,it)
}
}
}
}
}
Now every time the user value is changing, I am using updateUserStatus(userPosition,it):
private fun updateUserStatus(userPosition: Int, userHashMap: HashMap<String, Any>) {
val userUID = userHashMap["userUID"] as String
val userStatus = userHashMap["status"] as String
val user : User = theUserList[userPosition]["Sender"] as User
Log.e("HashMap","UID - $userUID")
if (userStatus == "Online") {
Log.e("HashMap","Online")
itemBinding.lastChatsImageOffline.visibility = View.GONE
itemBinding.lastChatsImageOnline.visibility = View.VISIBLE
itemBinding.lastChatsUsersUserName.text = "Online"
notifyItemChanged(userPosition)
}else{
Log.e("HashMap","Offline")
itemBinding.lastChatsImageOffline.visibility = View.VISIBLE
itemBinding.lastChatsImageOnline.visibility = View.GONE
itemBinding.lastChatsUsersUserName.text = "Offline"
notifyItemChanged(userPosition)
}
}
The problem is that I don't get the right user position and the visibility of the images is not changing,only the textView change.
If you have any other suggestions or criticism I really like to know how can I get better.
This is the full RecyclerViewAdapter code: https://pastebin.com/nDbU3VeW
Thank you very much !
