Android Week 15

What is biometric authentication?

Verifying identity using unique physical or behavioral characteristics

What API does Android provide for biometric authentication?

BiometricPrompt API

Name three biometric types supported by Android?

Fingerprint, Face, Iris

What are the three biometric security levels in Android?

Strong, Weak, Device Credential

What class check biometric hardware availbility in Android?

BiometricManager

What are the permissions needed for biometric use?

USE_BIOMETRIC and USE_FINGERPRINT

How do you check if biometrics are supported on a device?

Use biometricManager.canAuthenticate()

What does BiometricPrompt.AuthenticationCallback handle?

Success, failure, and error events during authentication

What is BiometricPrompt.PromptInfo.Builder() used for?

To configure the authentication prompt dialog

In Compose, how can you trigger biometric auth in the UI?

Use a Button that calls biometricPrompt.authenticate(…)

What is a fallback mechanism in biometric auth?

Using a PIN or password if biometrics fail or are unavailable

Should biometric data be stored on the device?

No. Always use BiometricPrompt to handle it securely

How can biometricPrompt be customized?

Change title, subtitle, description, and negative button text

Can you use multiple biometric types in Android?

Yes, fingerprint and face recognition can both be supported

What is biometricPrompt.CryptoObject used for?

To handle encrypted data authentication with biometrics

What should you do if no biometric data is enrolled?

Prompt the user to enroll via system settings

What causes consistent biometric failures?

Dirty sensor, improper enrollment, or hardware issues

How do you avoid blocking UI during authentication?

Run BiometricPrompt on ContextCompat.getMainExecutor()

How to use biometric authentication with Firebase?

Trigger Firebase logic after biometric successH

How is biometric auth used for encrypted data?

Use BiometricPrompt with a CryptoObject to decrypt