FireBase Google Login

Integrating Google Sign-In into Your Android App | Authentication | Google for Developers

To integrate Google Sign-In into your Android app, configure Google Sign-In and add a button to your app's layout that starts the sign-in flow.

https://developers.google.com/identity/sign-in/android/legacy-sign-in

Add the Google Sign-in button to your app

Add the SignInButton in your application's layout:


<com.google.android.gms.common.SignInButton
 android:id="@+id/sign_in_button"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" />

Note: - You can also create your own view / layout and follow process below on that view / layout.

Optional: If you are using the default sign-in button graphic instead of providing your own sign-in button assets, you can customize the button's size with the setSize method.


lateinit var signInButton : Button 


// Set the dimensions of the sign-in button.
signInButton = findViewById(R.id.sign_in_button)

signInButton.setSize(SignInButton.SIZE_STANDARD)

//binding.signInButton.setSize(SignInButton.SIZE_STANDARD)
//binding.signInButton.setSize(SignInButton.SIZE_WIDE)
//binding.signInButton.setSize(SignInButton.SIZE_ICON_ONLY)

In the Android activity (for example, in the onCreate method), register your button's OnClickListener to sign in the user when clicked:


binding.signInButton.setOnClickListener {
            signInWithGoogle()
}

Implement Firebase in your App And add SHA-1 key in firebase project

FireBase Implementation

from there download newly updated google-services.json file and and to your source folder in project view from android studio

Add Dependency


dependencies {
// Import the BoM for the Firebase platform
    implementation(platform("com.google.firebase:firebase-bom:32.7.1"))

// Add the dependency for the Firebase Authentication library
    // When using the BoM, you don't specify versions in Firebase library dependencies
implementation("com.google.firebase:firebase-auth")

 // Also add the dependency for the Google Play services library and specify its version
    implementation("com.google.android.gms:play-services-auth:20.7.0")
}

Sync your project and all gradle files

In your sign-in activity's onCreate method, get the shared instance of the FirebaseAuth object:


private lateinit var auth: FirebaseAuth
// ...
// Initialize Firebase Auth
auth = Firebase.auth

Code to login with google account

How to get requestIdToken

Unable to Login With Google Android getting API Exception 10

I have been trying to integrate Firebase Google Login in my app but I am getting com.google.android.gms.common.api.ApiException: 10: ...

https://stackoverflow.com/questions/48833351/unable-to-login-with-google-android-getting-api-exception-10

Open google-services.json file in there get second client id value from page start


// Google Sign in Client
// Outside and above onCreate(_) 
val gso = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
    .requestIdToken("163183586333-uivj0s3qggjvhcjtdthlajlig0arehkq.apps.googleusercontent.com")
    .requestEmail()
    .build()

lateinit var googleSignInClient : GoogleSignInClient

// Inside OnCreate() Intialise this 
googleSignInClient = GoogleSignIn.getClient(this@SignInActivity, gso)

binding.googleSignIn.setOnClickListener {
        signInWithGoogle()
}



// Add belove code  outside the on create method 

private fun signInWithGoogle() {
    val signInIntent = googleSignInClient.signInIntent
    googleActivityResult.launch(signInIntent)
}

val googleActivityResult =
		registerForActivityResult(ActivityResultContracts.StartActivityForResult()) 
{ result ->
    val task = GoogleSignIn.getSignedInAccountFromIntent(result.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)
    auth.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")
							//  Go to Main Page if Login Success
                val user = auth.currentUser
            } else {
                // If sign in fails, display a message to the user.
                Log.w(TAG, "signInWithCredential:failure", task.exception)
            }
        }
}

Google Signing using Firebase Authentication in Android - GeeksforGeeks

A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.

https://www.geeksforgeeks.org/google-signing-using-firebase-authentication-in-android-using-java/




class GoogleSignInActivity : AppCompatActivity() {


    private val binding: ActivityGoogleSignInBinding by lazy {
        ActivityGoogleSignInBinding.inflate(layoutInflater)
    }

    private val googleSignInViewModel: GoogleSignInViewModel by viewModels()

    lateinit var googleSignInClient: GoogleSignInClient

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(binding.root)

        binding.signInButton.setSize(SignInButton.SIZE_ICON_ONLY)

        googleSignInClient =
            GoogleSignIn.getClient(this@GoogleSignInActivity, googleSignInViewModel.gso)


        binding.btnLogout.setOnClickListener {
            if (googleSignInViewModel.auth.currentUser != null) {
                googleSignInViewModel.auth.signOut()
            } else {
                toast("Login Or Sign In First")
            }
        }

        binding.signInButton.setOnClickListener {
          signInWithGoogle()
        }

        googleSignInViewModel.onStateChanged = object : OnStateChanged {
            override fun onCodeSent() {}

            override fun onLoginSuccess(message: String) {
                toast(message)
            }
        }
    }




    private fun signInWithGoogle() {
        val signInIntent = googleSignInClient.signInIntent
        googleActivityResult.launch(signInIntent)
    }

    private val googleActivityResult =
        registerForActivityResult(ActivityResultContracts.StartActivityForResult())
        { result ->
            val task = GoogleSignIn.getSignedInAccountFromIntent(result.data)
            try {
                // Google Sign In was successful, authenticate with Firebase
                val account = task.getResult(ApiException::class.java)!!
                Log.d("=+=+=+", "firebaseAuthWithGoogle:" + account.id)
                googleSignInViewModel.firebaseAuthWithGoogle(
                    activity = this@GoogleSignInActivity,
                    idToken = account.idToken!!
                )
            } catch (e: ApiException) {
                // Google Sign In failed, update UI appropriately
                Log.w("=+=+=+", "Google sign in failed", e)
            }
        }


}