I am planning to make an application using Firebase Auth with Google. But when I select my google account from the Google button it displays the following error message (At the end of this post). Also, please notice that the startActivityForResult is Deprecated. I would really appreciate help on this, as I'm new to Kotlin.
Thank You
Xml Code
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".adapters.Sign_in_page">
<com.google.android.gms.common.SignInButton
android:id="@+id/sign_in_button"
android:layout_width="match_parent"
android:layout_height="60sp"
android:layout_marginLeft="50sp"
android:layout_marginTop="512dp"
android:layout_marginRight="50sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.16"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
Kotlin Code
class Sign_in_page : AppCompatActivity() {
private lateinit var mauth : FirebaseAuth
private lateinit var mGoogleSignInClient: GoogleSignInClient
private val RC_SIGN_IN = 9001
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_sign_in_page)
val gso = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken("972503126282-sv3aqkustdhtq49a605hnvauubroht95.apps.googleusercontent.com")
.requestEmail()
.build()
mGoogleSignInClient = GoogleSignIn.getClient(this, gso)
mauth = FirebaseAuth.getInstance()
sign_in_button.setOnClickListener {
resultLauncher.launch(Intent(mGoogleSignInClient.signInIntent))
} var resultLauncher = registerForActivityResult(StartActivityForResult()) { result ->
if (result.resultCode == Activity.RESULT_OK) {
val intent: Intent? = result.data
val task = GoogleSignIn.getSignedInAccountFromIntent(intent)
try {
val account = task.getResult(ApiException::class.java)!!
firebaseAuthWithGoogle(account.idToken!!)
} catch (e: ApiException) {
Toast.makeText(this, "Sign In Failed!", Toast.LENGTH_SHORT).show()
}
}
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
// Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
if (requestCode == RC_SIGN_IN) {
val task = GoogleSignIn.getSignedInAccountFromIntent(data)
try {
// Google Sign In was successful, authenticate with Firebase
val account = task.getResult(ApiException::class.java)!!
//Log.d("TAG", "firebaseAuthWithGoogle:" + account.id)
firebaseAuthWithGoogle(account.idToken!!)
} catch (e: ApiException) {
// Google Sign In failed, update UI appropriately
// Log.w("TAG", "Google sign in failed", e)
// ...
}
}
}
private fun firebaseAuthWithGoogle(idToken: String) {
val credential = GoogleAuthProvider.getCredential(idToken, null)
mauth.signInWithCredential(credential)
.addOnCompleteListener(this) { task ->
if (task.isSuccessful) {
// Sign in success, update UI with the signed-in user's information
// Log.d("TAG", "signInWithCredential:success")
val user = mauth.currentUser
// updateUI(user)
} else {
// If sign in fails, display a message to the user.
// Log.w("TAG", "signInWithCredential:failure", task.exception)
// ...
Toast.makeText(this, "Authentication Failed.", Toast.LENGTH_SHORT).show()
// updateUI(null)
}
// ...
}
}
}
Error
W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getVisibility()' on a null object reference
W/System.err: at android.view.ViewRootImpl.getHostVisibility(ViewRootImpl.java:1806)
at android.view.ViewRootImpl.handleAppVisibility(ViewRootImpl.java:1442)
at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:4838)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:214)
W/System.err: at android.app.ActivityThread.main(ActivityThread.java:7078)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494)
W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:964)
