I am getting issues of getting my USER KEY and it returned as null even if there's a username.
Thing is I am just trying to get my username.
I am currently using firebase database
class NewMessageActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_new_message)
supportActionBar?.title="Select User"
/*
val adapter = GroupAdapter<ViewHolder>()
adapter.add(UserItem())
adapter.add(UserItem())
adapter.add(UserItem())
new_message_list.adapter = adapter
*/
fetchusers()
}
companion object {
val USER_KEY = "USER_KEY"
}
private fun fetchusers(){
val ref = FirebaseDatabase.getInstance().getReference("/users")
ref.addListenerForSingleValueEvent(object: ValueEventListener {
override fun onDataChange(p0: DataSnapshot) {
val adapter = GroupAdapter<ViewHolder>()
p0.children.forEach {
Log.d("NewMessage", it.toString())
val user = it.getValue(User::class.java)
if (user != null){
adapter.add(UserItem(user))
}
}
adapter.setOnItemClickListener { item, view ->
val userItem = item as UserItem
val intent = Intent(view.context, ChatLogActivity::class.java)
intent.putExtra(USER_KEY, userItem.user.username)
startActivity(intent)
finish()
}
new_message_list.adapter = adapter
}
override fun onCancelled(p0: DatabaseError) {
}
})
}
}
class UserItem(val user: User): Item<ViewHolder>() {
override fun bind(viewHolder: ViewHolder, position: Int){
//list stuff
viewHolder.itemView.username_textview_new.text = user.username
Picasso.get().load(user.profileImageUrl).into(viewHolder.itemView.imageview_new_msg)
}
override fun getLayout(): Int {
return R.layout.user_row_new_message
}
}
This one really frustrated me for hours. I needed this for my chat log title for each person
Maybe I should skip this?
I am just new to android development
Can anyone help?
error in debug
Related
My problem is that I want to select an item in a RecyclerView and it should change the color and if I click on another the first selected item should change to the default color (and the last clicked should have the selected color).
I have already a color change of the selected one and if I click on the selected one again it changes to default color. Now I am only missing that if I click on an unselected item and if I have already a selected item they "switch" the color
This is my SubItem class:
class SubItem(val channel: Channel) : Item<GroupieViewHolder>() {
#SuppressLint("ResourceAsColor")
override fun bind(viewHolder: GroupieViewHolder, position: Int) {
val profileImageUrl = channel.channel_logo
viewHolder.itemView.sub_item_name.text = channel.channel_name
viewHolder.itemView.sub_item_layout.setBackgroundResource(R.color.white)
viewHolder.itemView.sub_item_name.setTextColor(R.color.colorSecondaryText)
val targetImageView = viewHolder.itemView.sub_item_profile
try {
Picasso.get().load(profileImageUrl)
.placeholder(R.drawable.ic_baseline_account_circle_24)
.into(targetImageView)
}catch (e:Exception){
Log.d("SubItem","${e.message}")
}
viewHolder.itemView.sub_item_layout.setOnClickListener {
if (selected_position == position){
selected_position = null
viewHolder.itemView.sub_item_layout.setBackgroundResource(R.color.white)
viewHolder.itemView.sub_item_name.setTextColor(R.color.colorSecondaryText)
}
else{
selected_position = position
viewHolder.itemView.sub_item_layout.setBackgroundResource(R.color.colorSecondaryText)
viewHolder.itemView.sub_item_name.setTextColor(R.color.black)
}
}
}
override fun getLayout(): Int {
return R.layout.subscription_item
}
}
If it is helping here is my function where I add the items to the RecyclerView
private fun fetchSubs() {
val uid = auth.uid
val user = database.getReference("/users/$uid/subscriptions")
val adapter = GroupAdapter<GroupieViewHolder>()
user.addListenerForSingleValueEvent(object : ValueEventListener{
#SuppressLint("NotifyDataSetChanged")
override fun onDataChange(p0: DataSnapshot) {
p0.children.forEach{
val sub = it.getValue(Subscription::class.java) ?: return
if (sub.subscribed == true) {
val ref = database.getReference("/channels/${sub.channel_uid}")
ref.addListenerForSingleValueEvent(object : ValueEventListener {
override fun onDataChange(p0: DataSnapshot) {
val channel = p0.getValue(Channel::class.java) ?: return
adapter.add(SubItem(channel))
}
override fun onCancelled(error: DatabaseError) {
}
})
}
}
adapter.setOnItemClickListener{ item, view ->
val subItem = item as SubItem
val channelName = subItem.channel.channel_name
val channelUid = subItem.channel.uid
Toast.makeText(requireContext(),"$channelName : $channelUid", Toast.LENGTH_SHORT).show()
fetchSubs()
}
sub_recyclerview.adapter = adapter
}
override fun onCancelled(error: DatabaseError) {
}
})
}
sorry that I am not using Models and Adapter
For everyone who uses groupie like me this could help you in future.
This is my solution for my Problem.
SubItem class
class SubItem(val channel: Channel) : Item<GroupieViewHolder>() {
#SuppressLint("ResourceAsColor")
override fun bind(viewHolder: GroupieViewHolder, position: Int) {
val profileImageUrl = channel.channel_logo
viewHolder.itemView.sub_item_name.text = channel.channel_name
val targetImageView = viewHolder.itemView.sub_item_profile
try {
Picasso.get().load(profileImageUrl)
.placeholder(R.drawable.ic_baseline_account_circle_24)
.into(targetImageView)
}catch (e:Exception){
Log.d("SubItem","${e.message}")
// Toast.makeText(,e.message,Toast.LENGTH_SHORT).show()
}
checkFilter(viewHolder,position)
}
#SuppressLint("ResourceAsColor")
private fun checkFilter(v: GroupieViewHolder, p: Int) {
when (SubscriptionsFragment.list[p]) {
true -> {
v.itemView.sub_item_layout.setBackgroundResource(R.color.colorDivider)
v.itemView.sub_item_name.setTextColor(R.color.black)
}
false -> {
v.itemView.sub_item_layout.setBackgroundResource(R.color.white)
v.itemView.sub_item_name.setTextColor(R.color.colorSecondaryText)
}
}
}
override fun getLayout(): Int {
return R.layout.subscription_item
}
}
My function with setOnItemClickListener
private fun fetchSubs() {
val uid = auth.uid
val user = database.getReference("/users/$uid/subscriptions")
val adapter = GroupAdapter<GroupieViewHolder>()
user.addListenerForSingleValueEvent(object : ValueEventListener{
#SuppressLint("NotifyDataSetChanged")
override fun onDataChange(p0: DataSnapshot) {
list = mutableListOf()
p0.children.forEach{
val sub = it.getValue(Subscription::class.java) ?: return
if (sub.subscribed == true) {
val ref = database.getReference("/channels/${sub.channel_uid}")
ref.addListenerForSingleValueEvent(object : ValueEventListener {
override fun onDataChange(p0: DataSnapshot) {
val channel = p0.getValue(Channel::class.java) ?: return
list.add(false) // created in companion object: var list = mutableListOf<Boolean>()
oldList.add(false) // created in companion object: var oldlist = mutableListOf<Boolean>()
adapter.add(SubItem(channel))
}
override fun onCancelled(error: DatabaseError) {
}
})
}
}
adapter.setOnItemClickListener{ item, view ->
val subItem = item as SubItem
val pos = adapter.getAdapterPosition(subItem)
// Here happens the magic
list[pos] = !list[pos] // change selected item from false to true or from true to false
val l = list[pos] // saving Boolean
list = mutableListOf()
oldList.forEach{ // using oldList to loop so many times I need
list.add(false) // setting all to false
}
if (l){ // if Boolean is true
list[pos] = !list[pos] // change selected item from false to true
}
val channelUid = subItem.channel.uid
fetchVideos(channelUid)
adapter.notifyDataSetChanged() // refresh all items in SubItem
}
try {
sub_recyclerview.adapter = adapter
} catch(e:Exception){
Log.d("fetchSubs","${e.message}")
}
}
override fun onCancelled(error: DatabaseError) {
}
})
}
I tried to add a new data to firebase and then show it in a recyclerview, but after i add the data the recyclerview just loop the whole data until the data is done uploading thus creating a view like this :
the looped recyclerview
As you can see in the picture that in that link, i tried to add "food 6" data but as the result for the adding process the recyclerview keep updating the items inside it until the adding process complete
Here is my adapter code
class FoodAdapter (private var dataList : ArrayList<Food>): RecyclerView.Adapter<FoodAdapter.MyViewholder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewholder {
val itemView = LayoutInflater.from(parent.context).inflate(R.layout.food_recyclerview,parent,false)
return MyViewholder(itemView)
}
override fun onBindViewHolder(holder: MyViewholder, position: Int) {
val currentItem = dataList[position]
Log.w("adapater",currentItem.image_pic.toString())
Picasso.get().load(currentItem.image_pic).into(holder.foodPic)
holder.food_name.text = currentItem.name
holder.food_price.text = currentItem.price.toString()
if (currentItem.avail == true){
holder.food_avail.text = "Tersedia"
holder.food_avail.setTextColor(Color.GREEN)
} else {
if (currentItem.avail == false){
holder.food_avail.text = "Habis"
holder.food_avail.setTextColor(Color.RED)
} else {
holder.food_avail.text = "Error"
}
}
}
override fun getItemCount(): Int {
return dataList.size
}
inner class MyViewholder (itemView : View): RecyclerView.ViewHolder(itemView){
val foodPic : ImageView = itemView.findViewById(R.id.iv_gambar_makanan)
val food_name : TextView = itemView.findViewById(R.id.tv_nama_makanan)
val food_avail : TextView = itemView.findViewById(R.id.tv_status_makanan)
val food_price : TextView = itemView.findViewById(R.id.tv_harga_makanan)
}
}
here is my update data to firebase code
private fun addDatatoFirebase() {
val dataRef = ref.child(preferences.getValue("username").toString()).child("FoodList/"+ UUID.randomUUID().toString())
var PicUrl = ""
val addImage = StorageRef.child(preferences.getValue("username").toString())
.child("food_pics/" + UUID.randomUUID())
Log.i("Cycle", "Add Image to Firebase")
addImage.putFile(FilePath).addOnSuccessListener {
addImage.downloadUrl.addOnSuccessListener {
PicUrl = it.toString()
dataRef.child("image_pic").setValue(PicUrl)
}
}
Log.i("URL",addImage.toString())
dataRef.addValueEventListener(object : ValueEventListener{
override fun onDataChange(snapshot: DataSnapshot) {
id = snapshot.ref
Log.w("PicUrl data",PicUrl)
dataRef.child("name").setValue(food_name)
dataRef.child("avail").setValue(availability)
dataRef.child("price").setValue(food_price.toInt())
}
override fun onCancelled(error: DatabaseError) {
Toast.makeText(applicationContext,"Error",Toast.LENGTH_SHORT)
}
})
}
and here is the code to get the data
private fun getFoodData() {
val foodData = ref.child(preferences.getValue("username").toString()).child("FoodList")
foodData.addValueEventListener(object : ValueEventListener{
override fun onDataChange(snapshot: DataSnapshot) {
if (snapshot != null) {
for (userSnapshot in snapshot.children) {
var data = userSnapshot.getValue(Food::class.java)
foodDataArrayList.add(data!!)
}
}
foodList.adapter = FoodAdapter(foodDataArrayList)
}
override fun onCancelled(error: DatabaseError) {
Toast.makeText(applicationContext,"Error",Toast.LENGTH_SHORT)
}
})
foodList.adapter = FoodAdapter(foodDataArrayList)
}
Can anyone show me how to fix this issue?
You missed out on one thing. Whenever data gets changed, you get all the entries again and again without removing the previous un-updated data. So, the simple solution would be to clear the list before getting the data. Try this code:
private fun getFoodData() {
val foodData = ref.child(preferences.getValue("username").toString()).child("FoodList")
foodData.addValueEventListener(object : ValueEventListener{
override fun onDataChange(snapshot: DataSnapshot) {
if (snapshot != null) {
foodDataArrayList.clear() // added this line
for (userSnapshot in snapshot.children) {
var data = userSnapshot.getValue(Food::class.java)
foodDataArrayList.add(data!!)
}
}
foodList.adapter = FoodAdapter(foodDataArrayList)
}
override fun onCancelled(error: DatabaseError) {
Toast.makeText(applicationContext,"Error",Toast.LENGTH_SHORT)
}
})
}
This question already has answers here:
getContactsFromFirebase() method return an empty list
(1 answer)
Setting Singleton property value in Firebase Listener
(3 answers)
Why does my function that calls an API or launches a coroutine return an empty or null value?
(4 answers)
Closed 1 year ago.
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
I am a new about Android Kotlin. I try to delete the data from Cloud Firebase when I click the button on my app. I did some necessary code on my adapter but How can ı call the database collection on my Activity? ı shared the my adapter and my Activity code below.
class NoteAdapter(val titleText: ArrayList<String>, val rowImage: ArrayList<String>, val noteText: ArrayList<String>, val listener: onClick) : RecyclerView.Adapter<NoteAdapter.NoteHolder>() {
interface onClick {
fun onItemClickListener(v: View, pos: Int, data: Any)
}
class NoteHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val itemImage : ImageView = itemView.findViewById(R.id.recyclerImage)
val itemDelete: ImageView = itemView.findViewById(R.id.delete)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): NoteHolder {
val v = LayoutInflater.from(parent.context).inflate(R.layout.recycler_row, parent, false)
return NoteHolder(v)
}
override fun onBindViewHolder(holder: NoteHolder, position: Int) {
holder.itemView.recyclerTitleText.text = titleText[position]
Picasso.get().load(rowImage[position]).resize(150,150).into(holder.itemImage)
holder.itemView.setOnClickListener {
val intent = Intent(holder.itemView.context, PastNotesActivity:: class.java)
intent.putExtra("oldTitle", titleText[position])
intent.putExtra("oldNote", noteText[position])
intent.putExtra("oldImage", rowImage[position])
holder.itemView.context.startActivity(intent)
}
holder.itemDelete.setOnClickListener { v: View ->
titleText.removeAt(position)
noteText.removeAt(position)
rowImage.removeAt(position)
notifyItemRemoved(position)
listener.onItemClickListener(v, position, holder.itemView)
}
}
override fun getItemCount(): Int {
return titleText.size
}
override fun getItemId(position: Int):Long {
return position.toLong()
}
override fun getItemViewType(position: Int):Int {
return position
}
}
And This is my Activity code, I create the itemDelete fun in this Activity but How can I define my adapter code in this fun? and I tried to write "{id.data}" in my document but did not work what should I write ?
class ListViewActivity : AppCompatActivity() {
var selectedPicture: Uri? = null
private lateinit var auth: FirebaseAuth
private lateinit var db : FirebaseFirestore
var titleTextFromFB : ArrayList<String> = ArrayList()
var noteTextFromFB : ArrayList<String> = ArrayList()
var imageFromFB : ArrayList<String> = ArrayList()
var adapter: NoteAdapter? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_list_view)
auth = FirebaseAuth.getInstance()
db = FirebaseFirestore.getInstance()
getDataFromFirestore()
// recyclerview
var layoutManager = LinearLayoutManager(this)
recyclerView.layoutManager = layoutManager
// adapter = NoteAdapter(titleTextFromFB, imageFromFB, noteTextFromFB)
//recyclerView.adapter = adapter
adapter = NoteAdapter(titleTextFromFB, imageFromFB, noteTextFromFB, object: NoteAdapter.onClick{
override fun onItemClickListener(v: View, pos: Int, data: Any) {
when(v.id){
R.id.delete -> itemDelete(data)
}
}
})
recyclerView.adapter = adapter
}
override fun onCreateOptionsMenu(menu: Menu?): Boolean {
val menuInflater = menuInflater
menuInflater.inflate(R.menu.add_note, menu)
return super.onCreateOptionsMenu(menu)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
if (item.itemId == R.id.add_note_click) {
// Take Notes Activity
val intent = Intent(applicationContext, TakeNotesActivity::class.java)
intent.putExtra("info","new")
startActivity(intent)
} else if (item.itemId == R.id.log_out) {
val alert = AlertDialog.Builder(this)
alert.setTitle("Log Out")
alert.setMessage("Are you sure to logout from the app ?")
alert.setPositiveButton("Yes") {dialog, which ->
auth.signOut()
val intent = Intent(applicationContext, MainActivity::class.java)
startActivity(intent)
finish()
}
alert.setNegativeButton("No") {dialog, which ->
}
alert.show()
}
return super.onOptionsItemSelected(item)
}
// get data from firestore
fun getDataFromFirestore() {
db.collection("Notes").orderBy("date", Query.Direction.DESCENDING).addSnapshotListener{ snapshot, exception ->
if (exception != null) {
// If there is a error ,
Toast.makeText(applicationContext, exception.localizedMessage.toString(), Toast.LENGTH_LONG).show()
} else {
if (snapshot != null) {
if (!snapshot.isEmpty) {
titleTextFromFB.clear()
noteTextFromFB.clear()
imageFromFB.clear()
val documents = snapshot.documents
for (document in documents) {
val userEmail = document.get("userEmail") as String
val noteTitle = document.get("noteTitle") as String
val yourNote = document.get("yourNote") as String
val downloadUrl = document.get("downloadUrl") as String
val timestamp = document.get("date") as Timestamp
val date = timestamp.toDate()
titleTextFromFB.add(noteTitle)
imageFromFB.add(downloadUrl)
noteTextFromFB.add(yourNote)
adapter!!.notifyDataSetChanged()
}
}
}
}
}
}
fun itemDelete(data: Any) {
db.collection("Notes").document().delete().addOnSuccessListener {
}
.addOnFailureListener { exception ->
Toast.makeText(applicationContext, exception.localizedMessage.toString(), Toast.LENGTH_LONG).show()
}
}
}
This code won't work:
db.collection("Notes").document().delete().addOnSuccessListener {
The db.collection("Notes").document() call creates a reference to a new document, which you then delete. So nothing happens.
What you need to do is determine the ID of the document that the user clicked on, and pass that into the document(...) call. That gives you a DocumentReference to the correct document, so that the delete() call will then delete that document.
The key to determining the ID of the document the user clicked on is in this code:
adapter = NoteAdapter(titleTextFromFB, imageFromFB, noteTextFromFB, object: NoteAdapter.onClick{
override fun onItemClickListener(v: View, pos: Int, data: Any) {
when(v.id){
R.id.delete -> itemDelete(data)
}
}
})
You will need to determine the ID from one of these parameters: v, post, or data. I typically do this by keeping a list of document IDs or DocumentSnapshot objects in my adapter or activity, and then looking the clicked item up by its position/index.
So in your getDataFromFirestore function, add the snapshots to a list that you've defined as a field in your activity class:
// in your activity, declare a list;
var mDocuments: List<DocumentSnapshot>? = null
// Then in getDataFromFirestore store that list
...
mDocuments = snapshot.documents;
val documents = snapshot.documents
for (document in documents) {
...
}
...
// And use it when calling itemDelete:
adapter = NoteAdapter(titleTextFromFB, imageFromFB, noteTextFromFB, object: NoteAdapter.onClick{
override fun onItemClickListener(v: View, pos: Int, data: Any) {
when(v.id){
R.id.delete -> itemDelete(mDocuments[pos])
}
}
})
// To then finally delete the document by its ID
fun itemDelete(doc: DocumentSnapshot) {
db.collection("Notes").document(doc.Id).delete()
}
I get list of issues from Firebase Database and return LiveData.
fun getAllIssues(): MutableLiveData<IssueEntity> {
val issues: MutableLiveData<IssueEntity> = MutableLiveData()
val issuesReference = FirebaseDatabase.getInstance().reference.child("issues")
issuesReference.addValueEventListener(object : ValueEventListener {
override fun onCancelled(p0: DatabaseError?) {
}
override fun onDataChange(snapshot: DataSnapshot?) {
if (snapshot == null) {
return
}
snapshot.children.forEach({
val issueMessage = it.child("message").value.toString()
val issueTitle = it.child("title").value.toString()
val issueOwner = it.child("owner").value.toString()
issues.postValue(IssueEntity(issueTitle, issueMessage, issueOwner))
})
}
})
return issues
}
Code of my Activity:
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_all_issues)
val issues: MutableList<IssueEntity> = mutableListOf()
issuesList.adapter = IssuesAdapter(issues)
IssueRepository().getAllIssues().observe(this, Observer {
if (it != null) {
issues.add(it)
val issuesAdapter = issuesList.adapter as IssuesAdapter
issuesAdapter.notifyDataSetChanged()
}
})
}
But Observer gets only first value. Could you please tell me why?
Sorry for the confusion. I just need to return not just MutableLiveData and MutableLiveData>