biometric.kt

private fun startBioAuth() {
    val iris = BiometricAuthRequest(
        BiometricApi.AUTO,
        BiometricType.BIOMETRIC_IRIS,
        BiometricConfirmation.ANY
    )
    val faceId = BiometricAuthRequest(
        BiometricApi.AUTO,
        BiometricType.BIOMETRIC_FACE,
        BiometricConfirmation.ANY
    )
    val fingerprint = BiometricAuthRequest(
        BiometricApi.AUTO,
        BiometricType.BIOMETRIC_FINGERPRINT,
        BiometricConfirmation.ANY
    )
    var title = ""
    val currentBiometric =
        if (BiometricManagerCompat.isHardwareDetected(iris)
            && BiometricManagerCompat.hasEnrolled(iris)
        ) {
            title =
                "Your eyes are beautiful, but you can use them to unlock our app"
            iris
        } else
            if (BiometricManagerCompat.isHardwareDetected(faceId)
                && BiometricManagerCompat.hasEnrolled(faceId)
            ) {
                title = "Use your smiling face to enter the app"
                faceId
            } else if (BiometricManagerCompat.isHardwareDetected(fingerprint)
                && BiometricManagerCompat.hasEnrolled(fingerprint)
            ) {
                title = "Your unique fingerprints can unlock this app"
                fingerprint
            } else {
                null
            }
currentBiometric?.let { biometricAuthRequest ->
        if (BiometricManagerCompat.isBiometricSensorPermanentlyLocked(biometricAuthRequest)
            || BiometricManagerCompat.isLockOut(biometricAuthRequest)
        ) {
            showToast("Biometric not available right now. Try again later")
            return
        }
        val prompt = BiometricPromptCompat.Builder(this).apply {
            this.setTitle(title)
            this.setNegativeButton("Cancel", null)
        }.build()
prompt.authenticate(object: BiometricPromptCompat.AuthenticationCallback {
        override fun onSucceeded(confirmed: Set<BiometricType>) {
            showToast("User authorized :)")
        }
override fun onCanceled() {
            showToast("Auth canceled :|")
        }
override fun onFailed(reason: AuthenticationFailureReason?){
            showToast("Fatal error happens :( Reason $reason")
        }
override fun onUIOpened() {}
        override fun onUIClosed() {}
    })
    } ?: run {
        showToast("No available biometric on this device")
    }
}