Google ontap login

https://developers.google.com/identity/one-tap/android

https://console.cloud.google.com/apis/credentials

https://developers.google.com/identity/protocols/oauth2/native-app

1. setFilterByAuthorizedAccounts(false)

setFilterByAuthorizedAccounts(true)

2. client Id

`google_login_android_web_client_id`

class GoogleLoginActivity : AppCompatActivity() {
    private var TAG = "GoogleLoginActivity"

    private lateinit var oneTapClient: SignInClient
    private lateinit var signInRequest: BeginSignInRequest

    private val REQ_ONE_TAP = 2  // Can be any integer unique to the Activity
    private var showOneTapUI = true

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_login_google_login)

        oneTapClient = Identity.getSignInClient(this)
        signInRequest = BeginSignInRequest.builder()
            .setPasswordRequestOptions(
                BeginSignInRequest.PasswordRequestOptions.builder()
                    .setSupported(true)
                    .build()
            )
            .setGoogleIdTokenRequestOptions(
                BeginSignInRequest.GoogleIdTokenRequestOptions.builder()
                    .setSupported(true)
                    // Your server's client ID, not your Android client ID.
                    .setServerClientId(getString(R.string.google_login_android_web_client_id))
                    // Only show accounts previously used to sign in.
                    .setFilterByAuthorizedAccounts(false) // !!!setFilterByAuthorizedAccounts(true)
                    .build()
            )
            // Automatically sign in when exactly one credential is retrieved.
            .setAutoSelectEnabled(true)
            .build()

        findViewById<View>(R.id.text_test).setOnClickListener {
            oneTapClient.beginSignIn(signInRequest)
                .addOnSuccessListener(this) { result ->
                    try {
                        startIntentSenderForResult(
                            result.pendingIntent.intentSender, REQ_ONE_TAP,
                            null, 0, 0, 0, null
                        )
                    } catch (e: IntentSender.SendIntentException) {
                        Log.e(TAG, "Couldn't start One Tap UI: ${e.localizedMessage}")
                    }
                }
                .addOnFailureListener(this) { e ->
                    // No saved credentials found. Launch the One Tap sign-up flow, or
                    // do nothing and continue presenting the signed-out UI.
                    Log.d(TAG, e.localizedMessage)
                }
        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        when (requestCode) {
            REQ_ONE_TAP -> {
                try {
                    val credential = oneTapClient.getSignInCredentialFromIntent(data)
                    val idToken = credential.googleIdToken
                    val username = credential.id
                    val password = credential.password

                    Log.d(TAG, "Got ID token.$idToken $username $password $credential")
                    when {
                        idToken != null -> {
                            // Got an ID token from Google. Use it to authenticate
                            // with your backend.
                            Log.d(TAG, "Got ID token.")
                        }
                        password != null -> {
                            // Got a saved username and password. Use them to authenticate
                            // with your backend.
                            Log.d(TAG, "Got password.")
                        }
                        else -> {
                            // Shouldn't happen.
                            Log.d(TAG, "No ID token or password!")
                        }
                    }
                } catch (e: ApiException) {
                    when (e.statusCode) {
                        CommonStatusCodes.CANCELED -> {
                            Log.d(TAG, "One-tap dialog was closed.")
                            // Don't re-prompt the user.
                            showOneTapUI = false
                        }
                        CommonStatusCodes.NETWORK_ERROR -> {
                            Log.d(TAG, "One-tap encountered a network error.")
                            // Try again or just ignore.
                        }
                        else -> {
                            Log.d(
                                TAG, "Couldn't get credential from result." + " (${e.localizedMessage})"
                            )
                        }
                    }
                }
            }
        }
    }
}

activity_login_google_login

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".ui.home.HomeFragment">

    <TextView
        android:id="@+id/text_test"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:textAlignment="center"
        android:textSize="20sp"
        android:text="login"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</LinearLayout>