Android Authentication – Identity and Credential Management - Learn ANDROID-KOTLIN | Revochamp

Name: Android Authentication – Identity and Credential Management
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Author: Revochamp

The Modern Identity Stack

Authentication on Android has evolved into a 'Passwordless' future. As an Architect, your focus should be on the Credential Manager API. This Jetpack library replaces the legacy 'Identity' and 'Google Sign-In' SDKs, providing a single entry point for all authentication methods. It allows Revochamp users to log in using biometric sensors (Face/Fingerprint) via Passkeys, significantly reducing drop-off rates in the Chennai market.

Credential Manager API

The Credential Manager handles the complexity of storage and retrieval. It supports multiple types of credentials: Passkeys (FIDO2), Google ID Tokens, and traditional Password-based accounts. By using this API, you ensure that user credentials are encrypted and synced across their Google account devices.

KOTLINRead-only

// Modern request to sign in a user
val credentialManager = CredentialManager.create(context)

val getCredentialRequest = GetCredentialRequest(
    listOf(GetPasswordOption(), GetGoogleIdOption(webClientId = "YOUR_CLIENT_ID"))
)

viewModelScope.launch {
    try {
        val result = credentialManager.getCredential(context, getCredentialRequest)
        handleSignIn(result)
    } catch (e: GetCredentialException) {
        // Handle error: No credentials found or user canceled
    }
}

// Modern request to sign in a user
val credentialManager = CredentialManager.create(context)

val getCredentialRequest = GetCredentialRequest(
    listOf(GetPasswordOption(), GetGoogleIdOption(webClientId = "YOUR_CLIENT_ID"))
)

viewModelScope.launch {
    try {
        val result = credentialManager.getCredential(context, getCredentialRequest)
        handleSignIn(result)
    } catch (e: GetCredentialException) {
        // Handle error: No credentials found or user canceled
    }
}

Passkeys: The Password Successor

Passkeys are a safer, easier replacement for passwords. They use public-key cryptography and are tied to the device's screen lock (Biometrics/PIN). For an Engineering Manager, the benefit is clear: zero phishing risk and no need to manage complex password reset flows for Revochamp's AI services.

Biometric Authentication

When your app needs an extra layer of security—such as before exporting a production-ready AI template—you can use the BiometricPrompt API. This allows you to request a fingerprint or face scan without managing the hardware specifics yourself.

KOTLINRead-only

val biometricPrompt = BiometricPrompt(this, executor, object : BiometricPrompt.AuthenticationCallback() {
    override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
        super.onAuthenticationSucceeded(result)
        // Proceed with sensitive action (e.g., Code Export)
    }
})

val promptInfo = BiometricPrompt.PromptInfo.Builder()
    .setTitle("Authenticate to Export")
    .setSubtitle("Use your fingerprint to confirm identity")
    .setNegativeButtonText("Cancel")
    .build()

biometricPrompt.authenticate(promptInfo)

val biometricPrompt = BiometricPrompt(this, executor, object : BiometricPrompt.AuthenticationCallback() {
    override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
        super.onAuthenticationSucceeded(result)
        // Proceed with sensitive action (e.g., Code Export)
    }
})

val promptInfo = BiometricPrompt.PromptInfo.Builder()
    .setTitle("Authenticate to Export")
    .setSubtitle("Use your fingerprint to confirm identity")
    .setNegativeButtonText("Cancel")
    .build()

biometricPrompt.authenticate(promptInfo)

Authentication Comparison

Feature	Android Native (Cred Manager)	Flutter (firebase_auth / local_auth)
Unified UI	Native bottom-sheet (All-in-one)	Plugin-dependent / Custom UI
Passkey Support	First-class / Integrated	Plugin support (passkeys_flutter)
Google Sign-In	Direct ID Token handling	GoogleSignIn plugin
Biometrics	BiometricPrompt API	local_auth plugin
Credential Sync	Auto-sync with Google Password Mgr	Manual / Firebase backend
Security Level	Hardware-backed (Strong)	App-level bridge

Test Your Knowledge

of 3

Which Android API is the unified replacement for passwords, Passkeys, and Google Sign-In?

AccountManager

IdentityManager

Credential Manager

SecurityProvider

of 3

What is the primary security advantage of using Passkeys over passwords?

They are easier to remember

They are immune to phishing and credential stuffing

They work without an internet connection

They use less battery

of 3

Which API should be used to request a fingerprint scan for a specific in-app action?

BiometricPrompt

FingerprintManager

SensorManager

ActivityManager

Frequently Asked Questions

What happened to the old Google Sign-In SDK?

In 2026, the legacy Google Sign-In SDK is deprecated. All Google identity features have been merged into the Credential Manager. This reduces APK size and provides a consistent experience across all Android versions.

Is it safe to store tokens in SharedPreferences?

No. As an Architect, you should never store sensitive Auth Tokens in plain-text SharedPreferences. Use 'EncryptedSharedPreferences' or the 'Android KeyStore' to ensure that tokens are encrypted at rest and cannot be read by rooted devices or other apps.

What is an ID Token vs. Access Token?

An ID Token (JWT) is used to verify the user's identity (who they are). An Access Token is used to authorize the app to access specific resources (what they can do, like your Python AI API).

// Modern request to sign in a user val credentialManager = CredentialManager.create(context) val getCredentialRequest = GetCredentialRequest( listOf(GetPasswordOption(), GetGoogleIdOption(webClientId = "YOUR_CLIENT_ID")) ) viewModelScope.launch { try { val result = credentialManager.getCredential(context, getCredentialRequest) handleSignIn(result) } catch (e: GetCredentialException) { // Handle error: No credentials found or user canceled } }

val biometricPrompt = BiometricPrompt(this, executor, object : BiometricPrompt.AuthenticationCallback() { override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) { super.onAuthenticationSucceeded(result) // Proceed with sensitive action (e.g., Code Export) } }) val promptInfo = BiometricPrompt.PromptInfo.Builder() .setTitle("Authenticate to Export") .setSubtitle("Use your fingerprint to confirm identity") .setNegativeButtonText("Cancel") .build() biometricPrompt.authenticate(promptInfo)

Feature

Android Native (Cred Manager)

Flutter (firebase_auth / local_auth)

Unified UI

Native bottom-sheet (All-in-one)

Plugin-dependent / Custom UI

Passkey Support

First-class / Integrated

Plugin support (passkeys_flutter)

Google Sign-In

Direct ID Token handling

GoogleSignIn plugin

Biometrics

BiometricPrompt API

local_auth plugin

Credential Sync

Auto-sync with Google Password Mgr

Manual / Firebase backend

Security Level

Hardware-backed (Strong)

App-level bridge

Test Your Knowledge

of 3

Which Android API is the unified replacement for passwords, Passkeys, and Google Sign-In?

AccountManager

IdentityManager

Credential Manager

SecurityProvider

of 3

What is the primary security advantage of using Passkeys over passwords?

They are easier to remember

They are immune to phishing and credential stuffing

They work without an internet connection

They use less battery

of 3

Which API should be used to request a fingerprint scan for a specific in-app action?

BiometricPrompt

FingerprintManager

SensorManager

ActivityManager

Frequently Asked Questions

What happened to the old Google Sign-In SDK?

Is it safe to store tokens in SharedPreferences?

What is an ID Token vs. Access Token?

An ID Token (JWT) is used to verify the user's identity (who they are). An Access Token is used to authorize the app to access specific resources (what they can do, like your Python AI API).

Android Authentication – Identity and Credential Management

Android Authentication – Identity and Credential Management

The Modern Identity Stack

Credential Manager API

Passkeys: The Password Successor

Biometric Authentication

Authentication Comparison

Test Your Knowledge

Frequently Asked Questions

Need help?

Android Authentication – Identity and Credential Management

Android Authentication – Identity and Credential Management

The Modern Identity Stack

Credential Manager API

Passkeys: The Password Successor

Biometric Authentication

Authentication Comparison

Test Your Knowledge

Frequently Asked Questions

Need help?