Android Biometric API Issue

Question

What I want to achieve: Provide options to login with different biometrics like FingerPrint, FaceId and Iris. I want to give option of using PIN, Password or Pattern incase any biometric sensor doesn't work.

Problem: While user clicks on "Use Password" option it directly goes to the "onAuthenticationError" callback where I'm checking error code for BiometricPrompt.ERROR_NEGATIVE_BUTTON. My concern is, do I need to handle it by myself? I mean do I need to show a dialogPopUp where I will ask user to enter his/her email/username and password and then he/she can login in my app?

What I have done:

dependency:

implementation 'androidx.biometric:biometric:1.2.0-alpha01'

MainActivity.kt

 class MainActivity : AppCompatActivity() { private lateinit var executor: Executor private lateinit var biometricPrompt: BiometricPrompt override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) executor = ContextCompat.getMainExecutor(this) biometricPrompt = createBiometricObject() } private fun createBiometricObject(): BiometricPrompt { return BiometricPrompt(this, executor, object : AuthenticationCallback() { override fun onAuthenticationError(errorCode: Int, errString: CharSequence) { super.onAuthenticationError(errorCode, errString) if (errorCode == ERROR_NEGATIVE_BUTTON && errString == "Use Password") { // Do I need to create my own DialogPopUp? } } override fun onAuthenticationFailed() { super.onAuthenticationFailed() } override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) { super.onAuthenticationSucceeded(result) } }) } fun loginWithBiometrics(view: View) { when (BiometricManager.from(this).canAuthenticate(BIOMETRIC_STRONG)) { BiometricManager.BIOMETRIC_SUCCESS -> biometricPrompt.authenticate( createPromptInfoForBiometrics() ) BiometricManager.BIOMETRIC_ERROR_NONE_ENROLLED -> Toast.makeText( this, "Please enroll your biometrics", Toast.LENGTH_LONG ).show() BiometricManager.BIOMETRIC_ERROR_NO_HARDWARE -> Toast.makeText( this, "Device not compatible", Toast.LENGTH_LONG ).show() BiometricManager.BIOMETRIC_ERROR_HW_UNAVAILABLE -> Toast.makeText( this, "Sensors are available as off now, please try again later!", Toast.LENGTH_LONG ).show() BiometricManager.BIOMETRIC_ERROR_SECURITY_UPDATE_REQUIRED -> { TODO() } BiometricManager.BIOMETRIC_ERROR_UNSUPPORTED -> { TODO() } BiometricManager.BIOMETRIC_STATUS_UNKNOWN -> { biometricPrompt.authenticate(createPromptInfoForBiometrics()) } } } private fun createPromptInfoForBiometrics(): BiometricPrompt.PromptInfo { return BiometricPrompt.PromptInfo.Builder() .setTitle("Biometric Login") .setSubtitle("Please login with your biometrics") .setNegativeButtonText("Use Password") .setAllowedAuthenticators(BIOMETRIC_STRONG) .build() } }

Any help would be appreciated.

Biometric has authentication types and these has special configuration(Class1, Class 2, Class 3 -> Default, WEAK, STRONG)-> source.android.com/compatibility/… — rguzman
– rguzman, Commented Jan 19, 2021 at 12:37
For my scenario which one should I use for NEGATIVE BUTTON CLICK? — Maulik Dodia
– Maulik Dodia, Commented Jan 19, 2021 at 12:54
i think it won't make difference , there is no relation between authenticators and negative button — Sanket Kachhela
– Sanket Kachhela, Commented Jan 19, 2021 at 13:04
I think, you can use or you should understand how Authentication types works for your goal: "Provide options to login with different biometrics like FingerPrint, FaceId and Iris. I want to give option of using PIN, Password or Pattern incase any biometric sensor doesn't work." — rguzman
– rguzman, Commented Jan 19, 2021 at 13:26

Ivan Syabro · Accepted Answer · 2022-01-04 11:55:04Z

You should try pass DEVICE_CREDENTIAL flag to setAllowedAuthenticators()

BiometricPrompt.PromptInfo.Builder() .setTitle("Biometric login for my app") //.. .setAllowedAuthenticators(DEVICE_CREDENTIAL or BIOMETRIC_STRONG) .build()

But also make sure you use it with appropriate android API level. According to docs:

Note that not all combinations of authenticator types are supported prior to Android 11 (API 30). Specifically, DEVICE_CREDENTIAL alone is unsupported prior to API 30, and BIOMETRIC_STRONG | DEVICE_CREDENTIAL is unsupported on API 28-29. Setting an unsupported value on an affected Android version will result in an error when calling build().

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