I receive null snapshot in only this two method
private fun getUserName() {
databaseReference=FirebaseDatabase.getInstance("https://tailoring-e7e0c-default-rtdb.asia-southeast1.firebasedatabase.app/").getReference("Users")
databaseReference.child(uAuth.currentUser?.uid.toString()).addValueEventListener(object : ValueEventListener {
override fun onDataChange(snapshot: DataSnapshot) {
var userList :User
userList = snapshot.getValue(User::class.java)!!
userName=userList?.cid.toString()
Toast.makeText(this@ProductDetail,"Username detected",Toast.LENGTH_LONG).show()
}
override fun onCancelled(error: DatabaseError) {
}
})
}
private fun getProductPic(prodImageURL:String) {
storageReference= FirebaseStorage.getInstance().reference.child(prodImageURL)
val localFile = File.createTempFile("tempImage","jpg")
storageReference.getFile(localFile).addOnSuccessListener {
val bitMap= BitmapFactory.decodeFile(localFile.absolutePath)
viewBinding.picViewProd.setImageBitmap(bitMap)
}
}
class ProductDetail : AppCompatActivity() {
private lateinit var databaseReference: DatabaseReference
private lateinit var uAuth:FirebaseAuth
private lateinit var storageReference: StorageReference
private lateinit var viewBinding:ActivityProductDetailBinding
private lateinit var adapter:commentAdapter
private lateinit var tc:String
private lateinit var commentList:ArrayList<commentContain>
private lateinit var thisProductID:String
private lateinit var dateTage :String
private var userName :String=""
private var tailorUID :String=""
private var tailorName :String=""
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
viewBinding = ActivityProductDetailBinding.inflate(layoutInflater)
val view = viewBinding.root
setContentView(view)
tc=getIntent().getStringExtra("tc").toString()
thisProductID = getIntent().getStringExtra("prodNo").toString()
uAuth = FirebaseAuth.getInstance()
//Comment adapter and recycler view code
commentList= ArrayList()
getTailorName()
getComment()
adapter= commentAdapter(this,commentList)
viewBinding.commentList.layoutManager=LinearLayoutManager(this)
viewBinding.commentList.adapter=adapter
getTimeTag()
val currentUser = uAuth.currentUser?.uid
val currentUserURL = "Users/$currentUser.jpg"
getProductData()
if(tc=="tailor"){
viewBinding.btnOrderProduct.isVisible=false
}
viewBinding.btnOrderProduct.setOnClickListener {
addOrder()
}
viewBinding.picViewTailor.setOnClickListener {
val intent = Intent(this, TailorProfile::class.java)
intent.putExtra("tc",tc)
intent.putExtra("tuid",tailorUID)
startActivity(intent)
}
viewBinding.sendButton.setOnClickListener{
getUserName()
val comment = viewBinding.messageBox.text.toString()
addComment(thisProductID,userName,comment,dateTage,currentUserURL)
}
}
private fun getUserName() {
databaseReference=FirebaseDatabase.getInstance("https://tailoring-e7e0c-default-rtdb.asia-southeast1.firebasedatabase.app/").getReference("Users")
databaseReference.child(uAuth.currentUser?.uid.toString()).addValueEventListener(object : ValueEventListener {
override fun onDataChange(snapshot: DataSnapshot) {
var userList :User
userList = snapshot.getValue(User::class.java)!!
userName=userList?.cid.toString()
Toast.makeText(this@ProductDetail,"Username detected",Toast.LENGTH_LONG).show()
}
override fun onCancelled(error: DatabaseError) {
}
})
}
private fun getProductData() {
databaseReference=FirebaseDatabase.getInstance("https://tailoring-e7e0c-default-rtdb.asia-southeast1.firebasedatabase.app/").reference
databaseReference.child("Product").child(thisProductID).addValueEventListener(object: ValueEventListener {
override fun onDataChange(snapshot: DataSnapshot) {
val productData = snapshot.getValue<Product>()
viewBinding.tvViewPrice.setText(productData?.price.toString())
viewBinding.tvViewClothspants.setText(productData?.clothsPants.toString())
viewBinding.tvViewFabric.setText(productData?.fabric.toString())
viewBinding.tvViewHeight.setText(productData?.height.toString())
viewBinding.tvViewHipBust.setText(productData?.hipBust.toString())
viewBinding.tvViewSleeve.setText(productData?.sleeve.toString())
viewBinding.tvViewStyleName.setText(productData?.styleName.toString())
viewBinding.tvViewWaist.setText(productData?.waist.toString())
tailorUID = productData?.tailorID.toString()
getTailorPic(productData?.tailorID.toString())
getProductPic(productData?.imageURL.toString())
}
override fun onCancelled(error: DatabaseError) {
Toast.makeText(this@ProductDetail,"Some Things wrong in the database", Toast.LENGTH_SHORT).show()
}
}
)
}
private fun getProductPic(prodImageURL:String) {
storageReference= FirebaseStorage.getInstance().reference.child(prodImageURL)
val localFile = File.createTempFile("tempImage","jpg")
storageReference.getFile(localFile).addOnSuccessListener {
val bitMap= BitmapFactory.decodeFile(localFile.absolutePath)
viewBinding.picViewProd.setImageBitmap(bitMap)
}
}
private fun getTailorName() {
databaseReference=FirebaseDatabase.getInstance("https://tailoring-e7e0c-default-rtdb.asia-southeast1.firebasedatabase.app/").getReference("Users")
databaseReference.child(tailorUID).addValueEventListener(object : ValueEventListener {
override fun onDataChange(snapshot: DataSnapshot) {
val userList = snapshot.getValue(User::class.java)!!
tailorName=userList.cid.toString()
viewBinding.tvPViewTailorName.setText(tailorName)
Toast.makeText(this@ProductDetail,"Username detected",Toast.LENGTH_LONG).show()
}
override fun onCancelled(error: DatabaseError) {
}
})
}
private fun getTailorPic(tailorUID:String){
storageReference= FirebaseStorage.getInstance().reference.child("Users/$tailorUID.jpg")
val localFile = File.createTempFile("tempImage","jpg")
storageReference.getFile(localFile).addOnSuccessListener {
val bitMap= BitmapFactory.decodeFile(localFile.absolutePath)
viewBinding.picViewTailor.setImageBitmap(bitMap)
}
}
private fun getComment() {
databaseReference=FirebaseDatabase.getInstance().getReference()
databaseReference.child("Comment").addValueEventListener(object : ValueEventListener {
override fun onDataChange(snapshot: DataSnapshot) {
commentList.clear()
for(postSnapshot in snapshot.children){
val currentComment = postSnapshot.getValue(commentContain::class.java)
if(currentComment?.productID==thisProductID){
commentList.add(currentComment!!)
}
}
adapter.notifyDataSetChanged()
}
override fun onCancelled(error: DatabaseError) {
}
})
}
private fun addOrder() {
val intent = Intent(this, NewCustomOrder::class.java)
intent.putExtra("tc",tc)
intent.putExtra("prodNo",thisProductID)
startActivity(intent)
}
private fun addComment(productID:String,senderID:String?,comment:String,dateTage:String,currentUserURL:String){
val newComment = commentContain(uAuth.currentUser?.uid,senderID,comment,dateTage,currentUserURL,productID)
databaseReference=FirebaseDatabase.getInstance().reference
databaseReference.child("Comment").child(commentList.size.toString()).setValue(newComment).addOnFailureListener{
Toast.makeText(this,"Some thing wrong for real time database", Toast.LENGTH_SHORT).show()
}.addOnSuccessListener {
Toast.makeText(this,"Comment is added", Toast.LENGTH_SHORT).show()
}
}
private fun getTimeTag() {
val formatter = SimpleDateFormat("yyyy_MM_dd", Locale.getDefault())
val now = Date()
dateTage=formatter.format(now).toString()
}
override fun onCreateOptionsMenu(menu: Menu?): Boolean {
super.onCreateOptionsMenu(menu)
getMenuInflater().inflate(R.menu.all_menu,menu)
return true
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
super.onOptionsItemSelected(item)
if(item.itemId==R.id.toProfile){
val intent = Intent(this, TailorProfile::class.java)
intent.putExtra("tc",tc)
intent.putExtra("tuid",uAuth.currentUser?.uid)
finish()
startActivity(intent)
}
else if(item.itemId == R.id.toHome){
val intent = Intent(this, ProductList::class.java)
intent.putExtra("tc",tc)
finish()
startActivity(intent)
}else if(item.itemId == R.id.logout){
val intent = Intent(this, Ground::class.java)
uAuth.signOut()
finish()
startActivity(intent)
}
return true
}
}
The only problem is the getUserName and getTailorName return null at all,which is cause by the snapshot return a null value. I have tried all the method of get data from firebase realtime database, but all of them meets same problem. The weird thing is only the two function meet that problem. Any one can help me please?
below is the picture output enter image description here
