Develop Reference

None of the following functions can be called with the arguments supplied: public suspend fun delay(timeMillis: Long):

import android.content.Intent
import android.os.Bundle
import android.view.View
import android.widget.ProgressBar
import androidx.appcompat.app.AppCompatActivity
import kotlinx.coroutines.*
class SplashScreen : AppCompatActivity() {
private lateinit var progressBar: ProgressBar
private val SPLASH_DISPLAY_LENGTH = 5000
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.splash_screen)
progressBar = findViewById(R.id.progressBar)
GlobalScope.launch(Dispatchers.Main) {
delay(SPLASH_DISPLAY_LENGTH)
progressBar.visibility = View.VISIBLE
loadWebView()
}
}
private suspend fun loadWebView() {
withContext(Dispatchers.IO) {
delay(SPLASH_DISPLAY_LENGTH)
}
startActivity(Intent(this, MainActivity::class.java))
finish()
}
}
This is a Splash Screen. I got this error - None of the following functions can be called with the arguments supplied:public suspend fun delay(timeMillis: Long): Unit defined in kotlinx.coroutinespublic suspend fun delay(duration: Duration): Unit defined in kotlinx.coroutines. Can anybody help me please. Thanks in Advance.

I got it. I removed SPLASH_DISPLAY_LENGTH and added the duration directly like this- delay(5000). It worked --
import android.annotation.SuppressLint
import android.content.Intent
import android.os.Bundle
import android.view.View
import android.widget.ProgressBar
import androidx.appcompat.app.AppCompatActivity
import kotlinx.coroutines.*
#OptIn(DelicateCoroutinesApi::class)
#SuppressLint("CustomSplashScreen")
class SplashScreen1 : AppCompatActivity() {
private lateinit var progressBar: ProgressBar
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.splash_screen)
progressBar = findViewById(R.id.progrssBar2)
GlobalScope.launch(Dispatchers.Main) {
delay(3000)
progressBar.visibility = View.VISIBLE
loadWebView()
}
}
private suspend fun loadWebView() {
withContext(Dispatchers.IO) {
delay(3000)
}
startActivity(Intent(this, MainActivity::class.java))
finish()
}
}

It is another answer thanks to #Tenfour04. Comment
import android.content.Intent
import android.os.Bundle
import android.view.View
import android.widget.ProgressBar
import androidx.appcompat.app.AppCompatActivity
import kotlinx.coroutines.*
class SplashScreen1 : AppCompatActivity() {
private lateinit var progressBar: ProgressBar
//Define the constant as long instead of int
private val SPLASH_DISPLAY_LENGTH = 5000L
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.splash_screen)
progressBar = findViewById(R.id.progress_circular)
GlobalScope.launch(Dispatchers.Main) {
delay(SPLASH_DISPLAY_LENGTH)
progressBar.visibility = View.VISIBLE
loadWebView()
}
}
private suspend fun loadWebView() {
withContext(Dispatchers.IO) {
delay(SPLASH_DISPLAY_LENGTH)
}
startActivity(Intent(this, MainActivity::class.java))
finish()
}
}

Firebase authentication issues, Kotlin

I am having some issues with Firebase auth. I'm building an app using using Kotlin but keep retrieving the error 'W/System: Ignoring header X-Firebase-Locale because its value was null.'
I had this working previously, when I had set up the application using activities. I've now moved towards MVP architecture, but this seems to have broken my firebase authentication. I have also ensured that Email/Password sign in method has been enabled in the Firebase console.
If anyone could please take a look and hopefully you can see where I am going wrong. Many thanks.
SignInView
package org.wit.hikingtrails.views.signIn
import android.content.Intent
import android.os.Bundle
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import org.wit.hikingtrails.databinding.ActivitySignInBinding
import com.google.firebase.auth.FirebaseAuth
import org.wit.hikingtrails.activities.SignUpActivity
import org.wit.hikingtrails.views.hikeList.HikeListView
import org.wit.hikingtrails.views.signUp.SignUpView
class SignInView : AppCompatActivity() {
lateinit var presenter: SignInPresenter
private lateinit var binding: ActivitySignInBinding
private lateinit var firebaseAuth: FirebaseAuth
override fun onCreate(savedInstanceState: Bundle?) {
presenter = SignInPresenter( this)
super.onCreate(savedInstanceState)
binding = ActivitySignInBinding.inflate(layoutInflater)
setContentView(binding.root)
firebaseAuth = FirebaseAuth.getInstance()
binding.textView.setOnClickListener {
val intent = Intent(this, SignUpView::class.java)
startActivity(intent)
}
binding.button.setOnClickListener {
val email = binding.emailEt.text.toString()
val pass = binding.passET.text.toString()
if (email.isNotEmpty() && pass.isNotEmpty()) {
presenter.doLogin(email, pass)
} else {
Toast.makeText(this, "Empty Fields Are not Allowed !!", Toast.LENGTH_SHORT).show()
}
}
}
override fun onStart() {
super.onStart()
if(firebaseAuth.currentUser != null){
val intent = Intent(this, HikeListView::class.java)
startActivity(intent)
}
}
}
SignInPresenter:
package org.wit.hikingtrails.views.signIn
import android.content.ContentValues.TAG
import android.content.Intent
import android.util.Log
import androidx.activity.result.ActivityResultLauncher
import androidx.activity.result.contract.ActivityResultContracts
import com.google.firebase.auth.FirebaseAuth
import org.wit.hikingtrails.views.hikeList.HikeListView
import timber.log.Timber
import timber.log.Timber.i
class SignInPresenter (val view: SignInView) {
private lateinit var loginIntentLauncher : ActivityResultLauncher<Intent>
init{
registerLoginCallback()
}
var auth: FirebaseAuth = FirebaseAuth.getInstance()
fun doLogin(email: String, pass: String) {
// view.showProgress()
auth.signInWithEmailAndPassword(email, pass).addOnCompleteListener(view) { task ->
if (task.isSuccessful) {
val launcherIntent = Intent(view, HikeListView::class.java)
loginIntentLauncher.launch(launcherIntent)
} else {
i("Login failed:")
// val launcherIntent = Intent(view, HikeListView::class.java)
// loginIntentLauncher.launch(launcherIntent)
}
// view.hideProgress()
}
}
private fun registerLoginCallback(){
loginIntentLauncher =
view.registerForActivityResult(ActivityResultContracts.StartActivityForResult())
{ }
}
}

For anyone that was having the same issue: The issue was with my API key. In kotlin, to debug, I used Timber.i( "signInWithCredential:failure ${task.exception?.message}") within the else statement of doLogin() in the presenter

I encountered a problem while following a tutorial on building an app with Kotlin

The error that appears is as follows "Type mismatch: inferred type is String? but String is expected". How can I solve this problem?
The source code is as follows:
package com.example.submission2.Activity
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.lifecycle.ViewModel
import androidx.lifecycle.ViewModelProvider
import com.bumptech.glide.Glide
import com.bumptech.glide.load.resource.drawable.DrawableTransitionOptions
import com.example.submission2.Adapter.AdapterSectionPager
import com.example.submission2.ViewModel.DetailVM
import com.example.submission2.databinding.ActivityDetailBinding
class DetailActivity : AppCompatActivity() {
companion object{
const val EXTRA_USERNAME = "extra_username"
}
private lateinit var binding: ActivityDetailBinding
private lateinit var viewModel: DetailVM
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityDetailBinding.inflate(layoutInflater)
setContentView(binding.root)
supportActionBar?.apply {
setDisplayHomeAsUpEnabled(true)
setDisplayShowHomeEnabled(true)
}
val username = intent.getStringExtra(EXTRA_USERNAME)
viewModel = ViewModelProvider(this, ViewModelProvider.NewInstanceFactory()).get(DetailVM::class.java)
viewModel.setPenggunaDetail(username)
viewModel.getPenggunaDetail().observe(this) {
if (it != null) {
binding.apply {
tvNamaDetail.text = it.name
tvUsernameDetail.text = it.login
tvCompanyDetail.text = it.company
tvEmailDetail.text = it.email
tvFollowersDetail.text = "${it.followers} Followers"
tvFollowingDetail.text = "${it.following} Follwing"
Glide.with(this#DetailActivity)
.load(it.avatar_url)
.transition(DrawableTransitionOptions.withCrossFade())
.centerCrop()
.into(ivDetailProfil)
}
}
}
val sectionPagerAdpter = AdapterSectionPager(this,supportFragmentManager)
binding.apply {
viewPager.adapter = sectionPagerAdpter
tabs.setupWithViewPager(viewPager)
}
}
}
error appears on the line "viewModel.set User Data(username)" username is used in extra_username which will be called in main
for main activity as follows:
package com.example.submission2.Activity
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.KeyEvent
import android.view.View
import androidx.lifecycle.ViewModelProvider
import androidx.recyclerview.widget.LinearLayoutManager
import com.example.submission2.Adapter.AdapterPengguna
import com.example.submission2.DataBase.Pengguna
import com.example.submission2.R
import com.example.submission2.ViewModel.MainVM
import com.example.submission2.databinding.ActivityMainBinding
class MainActivity : AppCompatActivity() {
private lateinit var binding: ActivityMainBinding
private lateinit var viewModel: MainVM
private lateinit var adapter: AdapterPengguna
private fun searchPengguna(){
binding.apply {
val query = etSearch.text.toString()
if (query.isEmpty())return
showLoading(true)
viewModel.setSearchPengguna(query)
}
}
private fun showLoading(state: Boolean){
if (state){
binding.progressBarMain.visibility = View.VISIBLE
}else{
binding.progressBarMain.visibility = View.GONE
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
adapter = AdapterPengguna()
adapter.notifyDataSetChanged()
adapter.setOnItemClickCallback(object :AdapterPengguna.OnItemClickCallback{
override fun onItemCliked(data: Pengguna) {
Intent(this#MainActivity,DetailActivity::class.java).also {
it.putExtra(DetailActivity.EXTRA_USERNAME, data.login)
startActivity(it)
}
}
})
viewModel = ViewModelProvider(this,ViewModelProvider.NewInstanceFactory()).get(MainVM::class.java)
binding.apply {
rvPengguna.layoutManager = LinearLayoutManager(this#MainActivity)
rvPengguna.setHasFixedSize(true)
rvPengguna.adapter = adapter
btnSearch.setOnClickListener {
searchPengguna()
}
etSearch.setOnKeyListener { v, keyCode, event ->
if (event.action == KeyEvent.ACTION_DOWN && keyCode == KeyEvent.KEYCODE_ENTER){
searchPengguna()
return#setOnKeyListener true
}
return#setOnKeyListener false
}
}
viewModel.getSearchPengguna().observe(this,{
if (it!= null){
adapter.setList(it)
showLoading(false
)
}
})
}
}

In your code there is no such line as viewModel.setUserData
I guess that the error occurs in the line viewModel.setPenggunaDetail(username)
In this case, you should pay attention to the fact that the all intent.getExtra calls returns nullable values.
Thus, if the setPenggunaDetail call expects a non-nullable argument, you must first check username value for null

Process: com.example.whatsappclone java.lang.IllegalArgumentException

i am getting this error
java.lang.NullPointerException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkNotNullParameter, parameter it
i don't know which variable is null i have used everything
need help , i am a beginner in android development , pls don't judge me
i know it's a simple mistake but unable to find it
Following is the entire code.
enter image description here
import android.content.Intent
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.LinearLayoutManager
import com.example.whatsappclone.Adapters.ChatAdapter
import com.example.whatsappclone.Models.MessageModel
import com.example.whatsappclone.databinding.ActivityChatDetailBinding
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.database.*
import com.squareup.picasso.Picasso
import java.util.*
import kotlin.collections.ArrayList
class ChatDetailActivity : AppCompatActivity() {
private lateinit var binding: ActivityChatDetailBinding//view binding
private lateinit var mDbRef: DatabaseReference
private lateinit var auth: FirebaseAuth
private lateinit var messageList: ArrayList<MessageModel>
private lateinit var chatAdapter: ChatAdapter
private var senderRoom: String? = null
private var receiverRoom: String? = null
override fun onCreate(savedInstanceState: Bundle?) {
//view binding
super.onCreate(savedInstanceState)
binding = ActivityChatDetailBinding.inflate(layoutInflater)
setContentView(binding.root)
//removing action bar
supportActionBar?.hide()
//getting instance of auth
auth = FirebaseAuth.getInstance()
//getting database reference
mDbRef = FirebaseDatabase.getInstance().reference
messageList = ArrayList()
val senderId = auth.currentUser?.uid//sender Id
val receiverId = intent.getStringExtra("userId")//receiver Id
senderRoom = senderId + receiverId
receiverRoom = receiverId + senderId
//getting intent extra
val userName = intent.getStringExtra("userName")
val profilePic = intent.getStringExtra("profilePic")
//putting intent extra values in views
binding.username.text = userName
if (!profilePic.equals("")) {
Picasso.get().load(profilePic).placeholder(R.drawable.defaultprofile)
.into(binding.IVProfileImage)
}
//on click listener on back button
binding.btnBack.setOnClickListener {
val intent = Intent(this#ChatDetailActivity, MainActivity::class.java)
startActivity(intent)
this.finish()
}
//chat recycler view adapter
chatAdapter = ChatAdapter(messageList, this)
binding.chatRecyclerView.adapter = chatAdapter
binding.chatRecyclerView.layoutManager = LinearLayoutManager(this)
mDbRef.child("chats")
.child(senderRoom!!).addValueEventListener(object : ValueEventListener {
override fun onDataChange(snapshot: DataSnapshot) {
messageList.clear()
for (postSnapshot in snapshot.children) {
val model = postSnapshot.getValue(MessageModel::class.java)
messageList.add(model!!)
}
chatAdapter.notifyDataSetChanged()
}
override fun onCancelled(error: DatabaseError) {
}
})
//on click on send button
binding.send.setOnClickListener {
// Toast.makeText(this, "sid:- " + senderId.toString(), Toast.LENGTH_SHORT).show()
// Toast.makeText(this, "rid:- " + receiverId.toString(), Toast.LENGTH_SHORT).show()
val message = binding.etMessage.text.toString()
val model = MessageModel(senderId!!, message)
// Toast.makeText(this, "mess- ${messageList.size}", Toast.LENGTH_SHORT).show()
// Toast.makeText(this, "id- ${senderId}", Toast.LENGTH_SHORT).show()
model.timeStamp = Date().time
binding.etMessage.setText("")
mDbRef.child("chats").child(senderRoom!!).push()
.setValue(model).addOnSuccessListener {
mDbRef.child("chats").child(receiverRoom!!).push()
.setValue(model)
}
}
}
}

I am not able to validate my new activity

I created a new empty activity for my project but I am getting an error. The activity file as well as the layout file is shown in red color. I tried creating an intent object from MainActivity, in order to start this activity but received the following error
Classifier 'Details' does not have a companion object, and thus must
be initialized here
I've attached a screenshot of my android studio.
Code for new activity
package com.example.safetyapp
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
class Details : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_details)
}
}
package com.example.safetyapp
import android.content.Intent
import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity
import com.firebase.ui.auth.AuthUI
import com.google.firebase.auth.FirebaseAuth
class MainActivity : AppCompatActivity() {
final val AUTH_REQUEST_CODE = 7192
lateinit var firebaseAuth:FirebaseAuth
lateinit var listener: FirebaseAuth.AuthStateListener
lateinit var providers: List<AuthUI.IdpConfig>
override fun onStart(){
super.onStart()
firebaseAuth.addAuthStateListener(listener)
}
override fun onStop(){
super.onStop()
if(listener!=null){
firebaseAuth.removeAuthStateListener(listener)
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val button2 = findViewById<Button>(R.id.button2)
val defence = findViewById<Button>(R.id.Defence)
button2.setOnClickListener{
val myintent = Intent(this, Details::class.java)
}
init()
}
private fun init() {
providers = arrayListOf(AuthUI.IdpConfig.PhoneBuilder().build(),
AuthUI.IdpConfig.EmailBuilder().build())
firebaseAuth = FirebaseAuth.getInstance()
listener = object:FirebaseAuth.AuthStateListener{
override fun onAuthStateChanged(p0: FirebaseAuth) {
val user = p0.currentUser
if(user!= null){
// Do something
}
else{
startActivityForResult(AuthUI.getInstance()
.createSignInIntentBuilder()
.setAvailableProviders(providers)
.setLogo(R.drawable.logo)
.build(),AUTH_REQUEST_CODE)
}
}
}
}
}

You didn't import the Details class, add this line between your MainActivity class imports
import com.example.safetyapp.Details