Firebase AuthUI not showing sign in flow

Question

I am trying out firebase auth UI ins simple Jetpack project. I followed the instructions here.

But signed in UI flow is not show, instead it shows me the main activity which is an empty constraint layout.

My code is as follows

MainActivity.kt

import android.os.Bundle
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.firebase.ui.auth.AuthUI
import com.google.firebase.auth.FirebaseAuth


class MainActivity : AppCompatActivity() {

    private lateinit var mFirebaseAuth: FirebaseAuth
    private  lateinit var mAuthStateListener: FirebaseAuth.AuthStateListener


    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Initialize Firebase Auth
        mFirebaseAuth = FirebaseAuth.getInstance()


        mAuthStateListener = FirebaseAuth.AuthStateListener { firebaseAuth -> // line 25


                val user = firebaseAuth.currentUser


                if (user != null){
                    Toast.makeText(applicationContext, "Already signed in", Toast.LENGTH_LONG).show()
                }
                else{
                    // Choose authentication providers
                    val providers = arrayListOf(
                        AuthUI.IdpConfig.EmailBuilder().build(),
                        AuthUI.IdpConfig.GoogleBuilder().build())

                    // Create and launch sign-in intent
                    startActivityForResult(
                        AuthUI.getInstance()
                            .createSignInIntentBuilder()
                            .setIsSmartLockEnabled(false)
                            .setAvailableProviders(providers)
                            .setTheme(R.style.AppTheme)      // Set theme
                            .setAvailableProviders(providers)
                            .setTosAndPrivacyPolicyUrls(
                                "https://example.com/terms.html",
                                "https://example.com/privacy.html")

                            .build(),
                        RC_SIGN_IN)
                }
        }
    }

    public override fun onStart() {
        super.onStart()
        mFirebaseAuth.addAuthStateListener { mAuthStateListener }
    }

    override fun onPause() {
        super.onPause()
        mFirebaseAuth.removeAuthStateListener { mAuthStateListener }
    }

    companion object {

        private const val RC_SIGN_IN = 123
    }

}

Dependencies

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.1.0-alpha02'

    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

     // firebase
     implementation 'com.firebaseui:firebase-ui-auth:4.3.1'
     implementation 'com.google.firebase:firebase-core:16.0.6'
     implementation 'com.google.firebase:firebase-auth:16.1.0'
     implementation 'com.google.android.gms:play-services-auth:16.0.1'


    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.2-alpha01'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.2-alpha01'
}

For providers as you can see I am only using Email and Google signin. Those providers are enabled in the firebase console. I also have a fingerprint specified in the project(which was there by default).

I tried debugging by setting breakpoint at line 25, I saw that the AuthStateListener lambda was not executed. I do not know why.

Please help!

---

UPDATE :

According to pointers given by Peter in his answer, dependencies were updated as mentioned here, but the issue still exists.

Answer 1

Actually after posting an issue on github repo, I came to know that the sign in flow appear when there is an internet connection (in my case it was keeping Wifi turned ON).

So this issue allowed one of members of the repo to identify a flaw in Firebase Auth UI (Android), he created a pull request that allows end users to pick auth method when they are offline.