Firebase Realtime Database images are not showing up in fragment kotlin class - android-studio

Question

I'm trying to show images from my Firebase Realtime Database storage. I've done this before with a previous version of my app, but the difference is how I implemented it. My adapter and arraylist class are exactly the same, but instead of using an activity I switched to using fragments.
What I essentially did was copy my old work and make the appropriate changes so I wouldn't run into errors, but unfortunately I ran into some. My images from Firebase are not showing up at all and I'm not sure what is the problem.
Adapter Class
class AbstractAdapter(private val mContext: Context, private val abstractList: ArrayList<Abstract>) : RecyclerView.Adapter<AbstractAdapter.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.abstract_image_view, parent, false)
return ViewHolder(view)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
Glide.with(mContext)
.load(abstractList[position].abstract)
.into(holder.imageView)
}
override fun getItemCount(): Int {
return abstractList.size
}
inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
var imageView: ImageView = itemView.findViewById(R.id.abstractImageView)
}
companion object {
private const val Tag = "RecyclerView"
}
}
Data class
class Abstract {
var abstract: String? = null
constructor() {}
constructor(abstract: String?) {
this.abstract = abstract
}
}
Fragment in which images will be shown
class AbstractWallpapers: Fragment(), PurchasesUpdatedListener {
private lateinit var subscribeAbstract: Button
private var billingClient: BillingClient? = null
lateinit var recyclerView: RecyclerView
lateinit var abstractlist: ArrayList<Abstract>
private var recyclerAdapterAbstract: AbstractAdapter? = null
private var myRef3: DatabaseReference? = null
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
return inflater.inflate(R.layout.fragment_abstract_wallpaper, container, false)
recyclerView = requireView().findViewById(R.id.abstract_recyclerView)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
recyclerView = view.findViewById(R.id.abstract_recyclerView)
val layoutManager = LinearLayoutManager(requireActivity())
recyclerView.layoutManager = layoutManager
recyclerView.setHasFixedSize(true)
myRef3 = FirebaseDatabase.getInstance().reference
abstractlist = ArrayList()
ClearAll()
GetDataFromFirebase()
subscribeAbstract = view.findViewById(R.id.abstract_subscribe_btn)
subscribeAbstract.setOnClickListener {
subscribeAbstract()
}
// Establish connection to billing client
//check subscription status from google play store cache
//to check if item is already Subscribed or subscription is not renewed and cancelled
billingClient = BillingClient.newBuilder(requireActivity()).enablePendingPurchases().setListener(this).build()
billingClient!!.startConnection(object : BillingClientStateListener {
override fun onBillingSetupFinished(billingResult: BillingResult) {
if (billingResult.responseCode == BillingClient.BillingResponseCode.OK) {
val queryPurchase = billingClient!!.queryPurchases(BillingClient.SkuType.SUBS)
val queryPurchases = queryPurchase.purchasesList
if (queryPurchases != null && queryPurchases.size > 0) {
handlePurchases(queryPurchases)
} else {
saveSubscribeValueToPref(false)
}
}
}
override fun onBillingServiceDisconnected() {
Toast.makeText(requireActivity(), "Service Disconnected", Toast.LENGTH_SHORT).show()
}
})
//item subscribed
if (subscribeValueFromPref) {
subscribeAbstract.visibility = View.GONE
} else {
subscribeAbstract.visibility = View.VISIBLE
}
}
// Code related to Firebase
#SuppressLint("NotifyDataSetChanged")
private fun GetDataFromFirebase() {
val query: Query = myRef3!!.child("Abstract")
query.addListenerForSingleValueEvent(object : ValueEventListener {
#SuppressLint("NotifyDataSetChanged")
override fun onDataChange(snapshot: DataSnapshot) {
for (dataSnapshot: DataSnapshot in snapshot.children) {
val abstract = Abstract()
abstract.abstract = dataSnapshot.child("abstract").value.toString()
abstractlist.add(abstract)
}
recyclerAdapterAbstract = abstractlist.let { AbstractAdapter(requireActivity(), it) }
recyclerView.adapter = recyclerAdapterAbstract
recyclerAdapterAbstract!!.notifyDataSetChanged()
}
override fun onCancelled(error: DatabaseError) {}
})
if (recyclerAdapterAbstract != null) recyclerAdapterAbstract!!.notifyDataSetChanged()
}
private fun ClearAll() {
abstractlist.clear()
abstractlist = ArrayList()
}

Answer 1

I fixed my problem. It turns out my rules in Firebase Realtime Database rules for read were set to false instead. My code works perfect. It was only a stupid error on my part.