Download Multiple images from Firebase Realtime Database to device storage - firebase

I have a recyclerview that displays multiple images from Firebase Realtime Database. The recyclerview also has a button within it. I want this button to allow users to be able to download these images ONE AT A TIME once they click it.
Once users click "download" I want the images to be saved to their device storage. I've tried multiple solutions for this, but they weren't helpful as they were for either Firestore Database or only allowed for one image to be downloaded.
Code
class AbstractAdapter(private val mContext: Context, private val abstractList: List<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) {
holder.download_btn.setOnClickListener {
downloadFile()
}
Glide.with(mContext)
.load(abstractList[position].abstract)
.into(holder.imageView)
}
override fun getItemCount(): Int {
return abstractList.size
}
class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val imageView: ImageView = itemView.findViewById(R.id.abstractImageView)
val download_btn: Button = itemView.findViewById(R.id.abstractDownloadBtn)
}
private fun downloadFile() {
val storage = FirebaseStorage.getInstance()
val storageRef = storage.getReferenceFromUrl("https://notes-72413.firebaseio.com/")
val islandRef = storageRef.child("Abstract")
val rootPath = File(Environment.getExternalStorageDirectory(), "abstract")
if (!rootPath.exists()) {
rootPath.mkdirs()
}
val localFile = File(rootPath, "imageName.jpeg")
islandRef.getFile(localFile)
.addOnSuccessListener(OnSuccessListener<FileDownloadTask.TaskSnapshot?> {
Log.e("firebase ", ";local tem file created created $localFile")
// updateDb(timestamp,localFile.toString(),position);
}).addOnFailureListener(OnFailureListener { exception ->
Log.e(
"firebase ",
";local tem file not created created $exception"
)
})
}
companion object {
private const val Tag = "RecyclerView"
}
I've tried this code, but once I click the "download" button it immediately crashes and Logcat says Firebase Storage URLs must point to an object in your Storage Bucket. Please obtain a URL using the Firebase Console or getDownloadUrl()
My Firebase Realtime Database
There's 64 files in total
Summary
I have a recyclerview that displays images from Firebase Realtime Database. Once users click the "download" button, it only downloads one image at a time to their device storage.
Update
private fun downloadFile() {
val storage = FirebaseStorage.getInstance()
val storageRef = storage.getReferenceFromUrl("abstract")
val rootPath = File(Environment.getExternalStorageDirectory(), "abstract")
if (!rootPath.exists()) {
rootPath.mkdirs()
}
val localFile = File(rootPath, "imageName.jpeg")
storageRef.child("Abstract").downloadUrl.addOnSuccessListener { Log.e("firebase ", ";local tem file created created $localFile")
}.addOnFailureListener(OnFailureListener { exception ->
Log.e("firebase ", ";local tem file not created created $exception")
})
}
These are the changes I made to my downloadFile function, but I still get an error:
The storage Uri could not be parsed
Second update
2022-06-11 21:36:00.536 29751-29751/com.khumomashapa.notes E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.khumomashapa.notes, PID: 29751
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:523)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1055)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1055) 
Caused by: java.net.MalformedURLException: no protocol:
at java.net.URL.<init>(URL.java:601)
at java.net.URL.<init>(URL.java:498)
at java.net.URL.<init>(URL.java:447)
at com.khumomashapa.notes.adapter.AbstractAdapter.downloadFile(AbstractAdapter.kt:57)
at com.khumomashapa.notes.adapter.AbstractAdapter.onBindViewHolder$lambda-0(AbstractAdapter.kt:35)
at com.khumomashapa.notes.adapter.AbstractAdapter.$r8$lambda$Rrmx0DFlwJu1z6QtjG8WCQp6NQQ(Unknown Source:0)
at com.khumomashapa.notes.adapter.AbstractAdapter$$ExternalSyntheticLambda0.onClick(Unknown Source:2)
at android.view.View.performClick(View.java:7216)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1217)
at android.view.View.performClickInternal(View.java:7190)
at android.view.View.access$3500(View.java:827)
at android.view.View$PerformClick.run(View.java:27663)
at android.os.Handler.handleCallback(Handler.java:900)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:219)
at android.app.ActivityThread.main(ActivityThread.java:8349)
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1055) 
Code
class AbstractAdapter(private val mContext: Context, private val abstractList: List<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) {
holder.download_btn.setOnClickListener {
downloadFile(url = String(), file = String.toString())
}
Glide.with(mContext)
.load(abstractList[position].abstract)
.into(holder.imageView)
}
override fun getItemCount(): Int {
return abstractList.size
}
class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val imageView: ImageView = itemView.findViewById(R.id.abstractImageView)
val download_btn: Button = itemView.findViewById(R.id.abstractDownloadBtn)
}
#Throws(IOException::class)
private fun downloadFile(url: String, file: String) {
val urlObj = URL(url)
val fileObj = File(file)
val conn = urlObj.openConnection()
val buffer = ByteArray(1024)
object : BufferedOutputStream(FileOutputStream(fileObj)) {
var `in` = BufferedInputStream(conn.getInputStream())
init {
var read: Int
while (`in`.read(buffer, 0, buffer.size) >= 0.also { read = it });
run {
out.write(buffer, 0, read)
}
out.flush()
}
}.use { out -> }
}

I found the perfect solution to my problem. All I had to do was create an OnItemClick interface to get a different result for each item click and use Download manager to download the images.
override fun onItemClick(item: String, pos:Int) {
abstractData = item
positionItem = pos
if (checkSelfPermission(requireActivity(), Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED ){
requestPermissions(arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE), REQ_CODE)
}else{
startDownloading()
}
Toast.makeText(requireActivity(), "Saved to Internal storage/Pictures/AbstractWallpaper", Toast.LENGTH_LONG).show()
}
private fun startDownloading() {
val request = DownloadManager.Request(Uri.parse(abstractData))
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI or DownloadManager.Request.NETWORK_MOBILE)
request.setTitle("Abstract Wallpaper")
request.setDescription("Your image is downloading")
request.allowScanningByMediaScanner()
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_PICTURES, "AbstractWallpapers")
val manager = activity?.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
manager.enqueue(request)
Toast.makeText(requireActivity(), "Download is starting...", Toast.LENGTH_LONG).show()
}

As you are downloading based on your storage URLs so need to use getDownloadUrl() method.
storageRef.child("Abstract").getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
#Override
public void onSuccess(Uri uri) {
...Uri
}
}).addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception exception) {
// To handle error
}
});

As those URLs in your database are publicly visible HTTP URLs. You can just download the files with a good old URLConnection and binary streams.
private void downloadFile(String url, String file) throws IOException {
URL urlObj = new URL(url);
File fileObj = new File(file);
URLConnection conn = urlObj.openConnection();
byte[] buffer = new byte[1024];
try (BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(fileObj)) {
try (BufferedInputStream in = new BufferedInputStream(conn.getInputStream())) {
int read;
while ((read = in.read(buffer, 0, buffer.length) >= 0) {
out.write(buffer, 0, read);
}
out.flush();
}
}
}

Not tested, but for idea,
I'm using okhttp and okio
fun saveImageToPicture(context: Countext, url: String, imageName: String, imageMimeType: String) {
val appImagePath = File(Environment.DIRECTORY_PICTURES, "FolderNameInPictures")
val date = System.currentTimeMillis()
val values = ContentValues().apply {
put(MediaStore.Images.Media.DISPLAY_NAME, "$imageName.$imageMimeType")
put(MediaStore.Images.Media.MIME_TYPE, "image/$imageMimeType")
put(MediaStore.Images.Media.DATE_ADDED, date)
put(MediaStore.Images.Media.DATE_MODIFIED, date)
}
var collection = if (Build.VERSION.SDK_INT >= 29 {
values.put(MediaStore.Images.Media.RELATIVE_PATH, "$appImagePath${File.separator}")
values.put(MediaStore.Images.Media.IS_PENDING, 1)
MediaStore.Images.Media.getContentUri(MediaStore.VOLUME_EXTERNAL_PRIMARY)
} else {
MediaStore.Images.Media.EXTERNAL_CONTENT_URI
}
val resolver = context.contentResolver
val insertedUri = resolver.insert(collection, values)
val outputStream = resolver.openOutputStream(insertedUri!!, "w")
downloadFromUrlToOutputStream(url, outputStream)
values.clear()
if (Build.VERSION.SDK_INT >= 29 {
values.put(MediaStore.Images.Media.IS_PENDING, 0)
}
resolver.update(insertedUri, values, null, null)
}
fun downloadFromUrlToOutputStream(url: String, output: OutputStream) {
val request = Request.Builder().url(url).build()
val response = OkHttpClient().newCall(request).execute();
val body = response.body()
val bufferSource = body.source()
val sink = Okio.buffer(Okio.sink(output))
val sinkBuffer = sink.buffer()
val bufferSize = 1024 * 8
while (bufferSource.read(sinkBuffer, bufferSize) != -1) {
sink.emit()
}
sink.flush()
sink.close()
bufferSource.close()
}

Related

I'm trying to create a new firebase user, and upload the user data to firebase database, but when I try yo get the uid it's always null

I am trying to get the user uid after creating an account, so I can create a document on Firestore with the uid as document id. The problem is that I get only null, everything is working fine and I'm able to sign the user and receive the code but the uid is always null.
I know I'm accessing the uid before it's initialized because it takes time to restore the authentication state when the app starts so any idea how to wait for it until it's initialized?
First of all, if the data entered is correct then we call login() function, then we send the verification code, when the code is sent inside the onCodeSent(), the method we call uploadSelectedImageToFirebaseStorage() to upload the user image then we call saveUserToDatabase() function, and here is the problem. Inside the saveUserToDatabase() function, the UID is always null no matter what I tried, am I missing something?
#file:Suppress("DEPRECATION")
class SignUpActivity : AppCompatActivity() {
private lateinit var binding: ActivitySignUpBinding
private lateinit var auth: FirebaseAuth
private lateinit var callbacks: PhoneAuthProvider.OnVerificationStateChangedCallbacks
lateinit var storedVerificationId: String
lateinit var resendToken: PhoneAuthProvider.ForceResendingToken
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivitySignUpBinding.inflate(LayoutInflater.from(this))
auth = FirebaseAuth.getInstance()
setContentView(binding.root)
val flProfilePicture = binding.frameProfilePicture
val tilUserName = binding.tilUserName
val tilPhoneNumber = binding.tilPhoneNumber
val startButton = binding.startButton
val currentUser = auth.currentUser
if (currentUser != null) {
val intent = Intent(this#SignUpActivity, MainChatsActivity::class.java)
startActivity(intent)
finish()
}
callbacks = object : PhoneAuthProvider.OnVerificationStateChangedCallbacks() {
override fun onVerificationCompleted(credential: PhoneAuthCredential) { }
override fun onVerificationFailed(e: FirebaseException) { }
override fun onCodeSent(
verificationId: String,
token: PhoneAuthProvider.ForceResendingToken,
) {
Toast.makeText(baseContext, "Code Sent", Toast.LENGTH_SHORT).show()
storedVerificationId = verificationId
resendToken = token
val intent = Intent(applicationContext, AuthenticatePhoneActivity::class.java)
intent.putExtra("storedVerificationId", storedVerificationId)
uploadSelectedImageToFirebaseStorage()
startActivity(intent)
finish()
}
}
flProfilePicture.setOnClickListener {
val intent = Intent(Intent.ACTION_PICK)
intent.type = "image/*"
startActivityForResult(intent, 0)
}
startButton.setOnClickListener {
if (TextUtils.isEmpty(tilUserName.text.toString())) {
tilUserName.error = "Enter valid Name"
}
if (TextUtils.isEmpty(tilPhoneNumber.text.toString())) {
tilPhoneNumber.error = "Enter valid phone number"
} else {
val userName: String = tilUserName.text.toString()
val userPhoneNumber: String = tilPhoneNumber.text.toString()
login()
}
}
}
private var selectedProfilePicture: Uri? = null
#Deprecated("Deprecated in Java")
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (requestCode == 0 && data != null) {
selectedProfilePicture = data.data
val bitmap = MediaStore.Images.Media.getBitmap(contentResolver, selectedProfilePicture)
val flProfilePicture = binding.frameProfilePicture
val selectedCircleFrame = binding.selectedPictureCircleFrame
selectedCircleFrame.setImageBitmap(bitmap)
flProfilePicture.alpha = 0f
}
}
private fun login() {
val mobileNumber = binding.tilPhoneNumber
val number = mobileNumber.text.toString().trim()
if (number.isNotEmpty()) {
sendVerificationCode(number)
} else {
mobileNumber.error = "Enter a valid phone number"
}
}
private fun sendVerificationCode(number: String) {
val options = PhoneAuthOptions.newBuilder(auth)
.setPhoneNumber(number)
.setTimeout(60L, TimeUnit.SECONDS)
.setActivity(this)
.setCallbacks(callbacks)
.build()
PhoneAuthProvider.verifyPhoneNumber(options)
}
private fun uploadSelectedImageToFirebaseStorage() {
if (selectedProfilePicture == null) {
return
}
val fileName = UUID.randomUUID().toString()
val ref = FirebaseStorage.getInstance().getReference("/images/$fileName")
ref.putFile(selectedProfilePicture!!)
.addOnSuccessListener {
ref.downloadUrl.addOnSuccessListener {
it.toString()
Log.d("SignUpActivity", "image uploaded successfully")
saveUserToDatabase(it.toString())
}
}
.addOnFailureListener {
saveUserToDatabase(it.toString())
}
}
private fun saveUserToDatabase(profileImageUrl: String) {
val tilUserName = binding.tilUserName.text.toString()
val tilPhoneNumber = binding.tilPhoneNumber.text.toString()
val uid = FirebaseAuth.getInstance().uid.toString()
val database = Firebase.database("https://blend-4a9e4-default-rtdb.asia-southeast1.firebasedatabase.app")
val myRef = database.getReference("/users/$uid")
val user = User(uid, tilPhoneNumber, tilUserName, profileImageUrl)
Log.d("currentUser", uid)
myRef.setValue(user)
.addOnFailureListener {
Toast.makeText(baseContext, "Something went wrong, try again.", Toast.LENGTH_SHORT).show()
}
}
}

LazyColumn not update when data in LiveData update

I want to create chat app UI using ViewModel but when I send button the List in ViewModel update but LayzColumn not update it data. I don't know why it's not working.
My ChatViewModel
class ChatViewModel: ViewModel() {
private val _messages: MutableLiveData<MutableList<String>> = MutableLiveData(mutableListOf(""))
val messages: LiveData<MutableList<String>> get() = _messages
fun add(message: String) {
_messages.value?.add(message)
Log.d("Haha", "${_messages.value?.size}")
_messages.notifyObserver()
}
}
fun <T> MutableLiveData<T>.notifyObserver() {
this.value = value
}
My LazyColumn
val messages by chatViewModel.messages.observeAsState(mutableListOf(""))
LazyColumn(modifier = Modifier
.fillMaxWidth()
.weight(1f)
) {
items(messages.toList()) { message ->
SenderChat(message = message)
}
}

How to save LocalData in Firebase Realtime database?

I am very new using Kotlin and programming and I am currently making a calendar with events. My problem comes when I want to connect these events to firebase.
I am using an example that I found in git (https://github.com/kizitonwose/CalendarView) that uses the ThreeTen library for dates. This is the Event object:
class Event (val id: String, val text: String, val date: LocalDate) : Serializable
The data variable is of the LocalData type and this is what is causing me problems since it seems that Firebase only accepts variables of type String, Int, etc ...
I tried to pass the variable to String with toString and with Gson (), without success.
Here is the code if it helps
private val inputDialog by lazy {
val editText = AppCompatEditText(requireContext())
val layout = FrameLayout(requireContext()).apply {
// Setting the padding on the EditText only pads the input area
// not the entire EditText so we wrap it in a FrameLayout.
setPadding(20, 20, 20, 20)
addView(editText, FrameLayout.LayoutParams(MATCH_PARENT, WRAP_CONTENT))
}
AlertDialog.Builder(requireContext())
.setTitle(getString(R.string.example_3_input_dialog_title))
.setView(layout)
.setPositiveButton(R.string.save) { _, _ ->
saveEvent(editText.text.toString())
// Prepare EditText for reuse.
editText.setText("")
}
.setNegativeButton(R.string.close, null)
.create()
.apply {
setOnShowListener {
// Show the keyboard
editText.requestFocus()
context.inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0)
}
setOnDismissListener {
// Hide the keyboard
context.inputMethodManager.toggleSoftInput(InputMethodManager.HIDE_IMPLICIT_ONLY, 0)
}
}
}
private var selectedDate: LocalDate? = null
private val today = LocalDate.now()
private val titleSameYearFormatter = DateTimeFormatter.ofPattern("MMMM")
private val titleFormatter = DateTimeFormatter.ofPattern("MMM yyyy")
private val selectionFormatter = DateTimeFormatter.ofPattern("yyyy MM dd")
private val events = mutableMapOf<LocalDate, List<Event>>()
private var prueba = Gson().toJson(events)
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
return inflater.inflate(R.layout.fragment_calendar, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
mDatabaseReference = mDatabase!!.reference.child("events")
exThreeRv.layoutManager = LinearLayoutManager(requireContext(), RecyclerView.VERTICAL, false)
exThreeRv.adapter = eventsAdapter
exThreeRv.addItemDecoration(DividerItemDecoration(requireContext(), RecyclerView.VERTICAL))
val daysOfWeek = daysOfWeekFromLocale()
val currentMonth = YearMonth.now()
exThreeCalendar.setup(currentMonth.minusMonths(10), currentMonth.plusMonths(10), daysOfWeek.first())
exThreeCalendar.scrollToMonth(currentMonth)
if (savedInstanceState == null) {
exThreeCalendar.post {
// Show today's events initially.
selectDate(today)
}
}
class DayViewContainer(view: View) : ViewContainer(view) {
lateinit var day: CalendarDay // Will be set when this container is bound.
val textView = view.exThreeDayText
val dotView = view.exThreeDotView
init {
view.setOnClickListener {
if (day.owner == DayOwner.THIS_MONTH) {
selectDate(day.date)
}
}
}
}
exThreeCalendar.dayBinder = object : DayBinder<DayViewContainer> {
override fun create(view: View) = DayViewContainer(view)
override fun bind(container: DayViewContainer, day: CalendarDay) {
container.day = day
val textView = container.textView
val dotView = container.dotView
textView.text = day.date.dayOfMonth.toString()
if (day.owner == DayOwner.THIS_MONTH) {
textView.makeVisible()
when (day.date) {
today -> {
textView.setTextColorRes(R.color.white)
textView.setBackgroundResource(R.drawable.today_bg)
dotView.makeInVisible()
}
selectedDate -> {
textView.setTextColorRes(R.color.white)
textView.setBackgroundResource(R.drawable.selected_bg)
dotView.makeInVisible()
}
else -> {
textView.setTextColorRes(R.color.black)
textView.background = null
dotView.isVisible = events[day.date].orEmpty().isNotEmpty()
}
}
} else {
textView.makeInVisible()
dotView.makeInVisible()
}
}
}
exThreeCalendar.monthScrollListener = {
requireActivity().home.text = if (it.year == today.year) {
titleSameYearFormatter.format(it.yearMonth)
} else {
titleFormatter.format(it.yearMonth)
}
// Select the first day of the month when
// we scroll to a new month.
selectDate(it.yearMonth.atDay(1))
}
class MonthViewContainer(view: View) : ViewContainer(view) {
val legendLayout = view.legendLayout
}
exThreeCalendar.monthHeaderBinder = object : MonthHeaderFooterBinder<MonthViewContainer> {
override fun create(view: View) = MonthViewContainer(view)
override fun bind(container: MonthViewContainer, month: CalendarMonth) {
// Setup each header day text if we have not done that already.
if (container.legendLayout.tag == null) {
container.legendLayout.tag = month.yearMonth
container.legendLayout.children.map { it as TextView }.forEachIndexed { index, tv ->
tv.text = daysOfWeek[index].name.first().toString()
tv.setTextColorRes(R.color.black)
}
}
}
}
exThreeAddButton.setOnClickListener {
inputDialog.show()
}
}
private fun selectDate(date: LocalDate) {
if (selectedDate != date) {
val oldDate = selectedDate
selectedDate = date
oldDate?.let { exThreeCalendar.notifyDateChanged(it) }
exThreeCalendar.notifyDateChanged(date)
updateAdapterForDate(date)
}
}
private fun saveEvent(text: String) {
if (text.isBlank()) {
Toast.makeText(requireContext(),
R.string.example_3_empty_input_text, Toast.LENGTH_LONG).show()
} else {
selectedDate?.let {
events[it] = events[it].orEmpty().plus(
Event(
UUID.randomUUID().toString(),
text,
it
)
)
uploadFirebase()
updateAdapterForDate(it)
}
}
}
private fun deleteEvent(event: Event) {
val date = event.date
events[date] = events[date].orEmpty().minus(event)
updateAdapterForDate(date)
}
private fun updateAdapterForDate(date: LocalDate) {
eventsAdapter.events.clear()
eventsAdapter.events.addAll(events[date].orEmpty())
eventsAdapter.notifyDataSetChanged()
exThreeSelectedDateText.text = selectionFormatter.format(date)
}
fun uploadFirebase(){
val newEvent = mDatabaseReference.push()
newEvent.setValue(events)
}
override fun onStart() {
super.onStart()
}
override fun onStop() {
super.onStop()
}
}
There is no way you can add a property of type LocalDate in a Firebase Realtime database because it is not a supported data-type. However, there are two ways in which you can solve this:
You save the date as a ServerValue.TIMESTAMP, which basically means that you save the number of seconds that have elapsed since the Unix epoch. In this case, the server writes the current date in the database. To achieve this, please see my answer from the following post:
How to save the current date/time when I add new value to Firebase Realtime Database
You specify a custom long value for your date field. In this case, it's up to you to determine what date is written.
Unfortunately, there is no way you can combine these two options, you can use one or the other.
When talking about a LocalDate, we usually talk about an offset, in which case, this what I'll do. I'll store a Timestamp property, as explained at point one, that will let the server populate with the server Timestamp, as well as an offset property, that should be populated with the offset in days/hours.

Cannot fetch messages from another user FirebaseDatabase

This is a simple chat messaging app, using Firebase Realtime Database and the Authentication. I have successfully created the database, but I cannot fetch the message from one user to another. Because, when I send the message/click the send button, it creates different nodes, I think its a string node with quotation mark in the name. The node structure I created is user-messages --> fromId(current user uid) --> toUid(to whom the messages are sent).
To make more clear explanation, this is the screenshot of what happened.
I think the problem is, it creates a different nodes with the "uid", which means string. So the database has two nodes, one with the "...", and the other the normal one. For some info, I use some library such as Picasso image load, groupie, and parcelize.
This is the source code for the ChatLogActivity
import...
class ChatLogActivity : AppCompatActivity() {
companion object {
val TAG = "ChatLog"
}
val adapter = GroupAdapter<ViewHolder>()
var toUser: User? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_chat_log)
recyclerview_chat_log.adapter = adapter
toUser = intent.getParcelableExtra(NewMessageActivity.USER_KEY)
titleChatLog.text = toUser?.nama
listenForMessages()
arrowBack.setOnClickListener {
finish()
}
send_button_chat_log.setOnClickListener {
Log.d(TAG, "Attempt to send message.....")
performSendMessage()
}
}
private fun listenForMessages() {
val fromId = FirebaseAuth.getInstance().uid
val toId = toUser?.uid
val ref = FirebaseDatabase.getInstance().getReference("/user-messages/$fromId/$toId")
ref.addChildEventListener(object : ChildEventListener {
override fun onChildAdded(p0: DataSnapshot, p1: String?) {
val chatMessage = p0.getValue(ChatMessage::class.java)
if (chatMessage != null) {
Log.d(TAG, chatMessage.text)
if (chatMessage.fromId == FirebaseAuth.getInstance().uid) {
val currentUser = LatestMessageActivity.currentUser?: return
adapter.add(ChatFromItem(chatMessage.text, currentUser))
} else {
adapter.add(ChatToItem(chatMessage.text, toUser!!))
}
}
}
override fun onCancelled(p0: DatabaseError) {
}
override fun onChildChanged(p0: DataSnapshot, p1: String?) {
}
override fun onChildMoved(p0: DataSnapshot, p1: String?) {
}
override fun onChildRemoved(p0: DataSnapshot) {
}
})
}
private fun performSendMessage() {
val text = edittext_chat_log.text.toString()
val fromId = FirebaseAuth.getInstance().uid
val user = intent.getParcelableExtra<User>(NewMessageActivity.USER_KEY)
val toId = user.uid
val ref = FirebaseDatabase.getInstance().getReference("/user-messages/$fromId/$toId").push()
val toRef = FirebaseDatabase.getInstance().getReference("/user-messages/$toId/$fromId ").push()
if (fromId == null) return
val chatMessage = ChatMessage(ref.key!!, text, fromId, toId, System.currentTimeMillis() / 1000)
ref.setValue(chatMessage)
.addOnSuccessListener {
Log.d(TAG, "Save our chat message: ${ref.key}")
edittext_chat_log.text.clear()
recyclerview_chat_log.scrollToPosition(adapter.itemCount - 1)
}
toRef.setValue(chatMessage)
}
}
class ChatFromItem(val text: String, val user: User) : Item<ViewHolder>() {
override fun getLayout(): Int {
return R.layout.chat_from_row
}
override fun bind(viewHolder: ViewHolder, position: Int) {
val uri = user.profileImageUrl
val targetImageView = viewHolder.itemView.imageViewFrom
Picasso.get().load(uri).into(targetImageView)
viewHolder.itemView.textViewFrom.text = text
}
}
class ChatToItem(val text: String, val user: User) : Item<ViewHolder>() {
override fun getLayout(): Int {
return R.layout.chat_to_row
}
override fun bind(viewHolder: ViewHolder, position: Int) {
val uri = user.profileImageUrl
val targetImageView = viewHolder.itemView.imageViewTo
Picasso.get().load(uri).into(targetImageView)
viewHolder.itemView.textViewTo.text = text
}
}
And this is the ChatMessage, class that store the messages.
class ChatMessage(val id:String, val text: String, val fromId: String, val toId: String, val timeStamp: Long) {
constructor(): this("", "", "", "", -1)
}
I'm very glad if anyone can help this problem. Thank you

How to download a jar file in corda on entering the hash value?

I have tried to upload a zip file and got the hash. Now I have called an api. In that I am giving the hash to download the file. But I am not able to download the file.
#PUT
#Path("download_file")
fun createIOU(
#QueryParam("sechash") sechash: String
): Response {
val SecuHash = SecureHash.parse(sechash)
return try {
val attachmentJr = downloadAttachment(rpcOps, SecuHash)
println("jar :"+attachmentJr)
Response.status(CREATED).entity("Transaction id ${attachmentJr} committed to ledger.\n").build()
} catch (ex: Throwable) {
logger.error(ex.message, ex)
Response.status(BAD_REQUEST).entity(ex.message!!).build()
}
}
private fun downloadAttachment(proxy: CordaRPCOps, attachmentHash: SecureHash) {
//Get the attachmentJar from node for attachmentHash.
val attachmentJar = proxy.openAttachment(attachmentHash)
//Read the content of Jar to get file name and data.
var file_name_data: Pair<String, ByteArray>? = null
JarInputStream(attachmentJar).use { jar ->
while (true) {
val nje = jar.nextEntry ?: break
if (nje.isDirectory) {
continue
}
file_name_data = Pair(nje.name, jar.readBytes())
}
}
}
You might want to take a look at this blog. It explains in great details how to achieve upload and download of attachments in Corda.
It demonstrates the download of an attachment using two different approaches:
Using attachmentId/ hash
#GetMapping("/{hash}")
fun downloadByHash(#PathVariable hash: String): ResponseEntity<Resource> {
val inputStream = InputStreamResource(proxy.openAttachment(SecureHash.parse(hash)))
return ResponseEntity.ok().header(
HttpHeaders.CONTENT_DISPOSITION,
"attachment; filename=\"$hash.zip\""
).body(inputStream)
}
Using the name of the attachment
#GetMapping
fun downloadByName(#RequestParam name: String): ResponseEntity<Resource> {
val attachmentIds: List<AttachmentId> = proxy.queryAttachments(
AttachmentQueryCriteria.AttachmentsQueryCriteria(filenameCondition = Builder.equal(name)),
null
)
val inputStreams = attachmentIds.map { proxy.openAttachment(it) }
val zipToReturn = if (inputStreams.size == 1) {
inputStreams.single()
} else {
combineZips(inputStreams, name)
}
return ResponseEntity.ok().header(
HttpHeaders.CONTENT_DISPOSITION,
"attachment; filename=\"$name.zip\""
).body(InputStreamResource(zipToReturn))
}
private fun combineZips(inputStreams: List<InputStream>, filename: String): InputStream {
val zipName = "$filename-${UUID.randomUUID()}.zip"
FileOutputStream(zipName).use { fileOutputStream ->
ZipOutputStream(fileOutputStream).use { zipOutputStream ->
inputStreams.forEachIndexed { index, inputStream ->
val zipEntry = ZipEntry("$filename-$index.zip")
zipOutputStream.putNextEntry(zipEntry)
inputStream.copyTo(zipOutputStream, 1024)
}
}
}
return try {
FileInputStream(zipName)
} finally {
Files.deleteIfExists(Paths.get(zipName))
}
}
https://lankydan.dev/uploading-and-downloading-attachments-in-corda

Resources