Pfthb

I am new to Firebase and Kotlin. I tested below code for OTP number generation but I am getting Firebase Phone Authentication has stopped Error and crashing the app. I am not sure whether I need FireBase Authentication account and where do I need to pass the credentials in the code. Thanks for your response.

MainActivity:
import android.content.Intent
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.Toast
import com.google.firebase.auth.FirebaseAuth
import kotlinx.android.synthetic.main.activity_main.*


class MainActivity : AppCompatActivity() 

 lateinit var mAuth: FirebaseAuth

 override fun onCreate(savedInstanceState: Bundle?) 
 super.onCreate(savedInstanceState)
 setContentView(R.layout.activity_main)
 mAuth = FirebaseAuth.getInstance()
 signOut.setOnClickListener 
 view: View? -> mAuth.signOut()
 startActivity(Intent(this, PhoneAuthentication::class.java))
 Toast.makeText(this, "Logged out Successfully :)", Toast.LENGTH_LONG).show()
 
 


 override fun onStart() 
 super.onStart()
 if (mAuth.currentUser == null) 
 startActivity(Intent(this, PhoneAuthentication::class.java))
 else 
 Toast.makeText(this, "Already Signed in :)", Toast.LENGTH_LONG).show()
 
 



PhoneAuthentication.kt
import android.content.Intent
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.Toast
import com.google.android.gms.tasks.Task
import com.google.firebase.FirebaseException
import com.google.firebase.auth.AuthResult
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.auth.PhoneAuthCredential
import com.google.firebase.auth.PhoneAuthProvider
import kotlinx.android.synthetic.main.activity_phone_authentication.*
import java.util.concurrent.TimeUnit


class PhoneAuthentication : AppCompatActivity() 

 lateinit var mCallbacks: PhoneAuthProvider.OnVerificationStateChangedCallbacks
 lateinit var mAuth: FirebaseAuth
 var verificationId = ""


 override fun onCreate(savedInstanceState: Bundle?) 
 super.onCreate(savedInstanceState)
 setContentView(R.layout.activity_phone_authentication)
 mAuth = FirebaseAuth.getInstance()
 veriBtn.setOnClickListener 
 view: View? -> progress.visibility = View.VISIBLE
 verify ()
 
 authBtn.setOnClickListener 
 view: View? -> progress.visibility = View.VISIBLE
 authenticate()
 
 


 private fun verificationCallbacks () 
 mCallbacks = object: PhoneAuthProvider.OnVerificationStateChangedCallbacks() 
 override fun onVerificationCompleted(credential: PhoneAuthCredential) 
 progress.visibility = View.INVISIBLE
 toast("LoggedIn Success :) "+ credential)
 signIn(credential)
 

 override fun onVerificationFailed(p0: FirebaseException?) 
 TODO("not implemented") //To change body of created functions use File 

 override fun onCodeSent(verfication: String?, p1: PhoneAuthProvider.ForceResendingToken?) 
// super.onCodeSent(verfication, p1)
 verificationId = verfication.toString()
 progress.visibility = View.INVISIBLE
 

 
 

 private fun verify () 

 verificationCallbacks()

 if(phnNoTxt.text.length>=13) 
 val phnNo = phnNoTxt.text.toString()
 PhoneAuthProvider.getInstance().verifyPhoneNumber(
 phnNo,
 60,
 TimeUnit.SECONDS,
 this,
 mCallbacks
 )
 
 else
 toast("please enter a valid contact number with country code!!")
 progress.visibility = View.INVISIBLE
 


 

 private fun signIn (credential: PhoneAuthCredential) 
 mAuth.signInWithCredential(credential)
 .addOnCompleteListener 
 task: Task<AuthResult> ->
 if (task.isSuccessful) 
 toast("LoggedIn Success !!)")
 startActivity(Intent(this, MainActivity::class.java))
 
 
 

 private fun authenticate () 

 val verifiNo = verifiTxt.text.toString()

 val credential: PhoneAuthCredential = PhoneAuthProvider.getCredential(verificationId, verifiNo)

 signIn(credential)

 

 private fun toast (msg: String) 
 Toast.makeText(this, msg, Toast.LENGTH_LONG).show()
 



ExampleInstrumentedTest.kt

import android.support.test.InstrumentationRegistry
import android.support.test.runner.AndroidJUnit4

import org.junit.Test
import org.junit.runner.RunWith

import org.junit.Assert.*

/**
 * Instrumented test, which will execute on an Android device.
 *
 * See [testing documentation](http://d.android.com/tools/testing).
 */
@RunWith(AndroidJUnit4::class)
class ExampleInstrumentedTest 
 @Test
 fun useAppContext() 
 // Context of the app under test.
 val appContext = InstrumentationRegistry.getTargetContext()
 assertEquals("com.winision.phoneauth", appContext.packageName)