Determine if biometric hardware is present and the user has enrolled biometrics on Android P

Question

I\'m asked to show certain UI elements depending on the presence of biometric hardware. For Android 23-27 I use FingerprintManager#isHardwareDetected() and

Answer 1

I wrote this method for Kotlin:

fun checkForBiometrics() : Boolean{
    Log.d(TAG, "checkForBiometrics started")
    var canAuthenticate = true
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if (Build.VERSION.SDK_INT < 29) {
            val keyguardManager : KeyguardManager = applicationContext.getSystemService(KEYGUARD_SERVICE) as KeyguardManager
            val packageManager : PackageManager   = applicationContext.packageManager
            if(!packageManager.hasSystemFeature(PackageManager.FEATURE_FINGERPRINT)) {
                Log.w(TAG, "checkForBiometrics, Fingerprint Sensor not supported")
                canAuthenticate = false
            }
            if (!keyguardManager.isKeyguardSecure) {
                Log.w(TAG, "checkForBiometrics, Lock screen security not enabled in Settings")
                canAuthenticate = false
            }
        } else {
            val biometricManager : BiometricManager = this.getSystemService(BiometricManager::class.java)
            if(biometricManager.canAuthenticate() != BiometricManager.BIOMETRIC_SUCCESS){
                Log.w(TAG, "checkForBiometrics, biometrics not supported")
                canAuthenticate = false
            }
        }
    }else{
        canAuthenticate = false
    }
    Log.d(TAG, "checkForBiometrics ended, canAuthenticate=$canAuthenticate ")
    return canAuthenticate
}

Additional, you have to implement on you app gradle file as dependecy:

implementation 'androidx.biometric:biometric:1.0.0-alpha04'

and also use the newest build tools:

compileSdkVersion 29
buildToolsVersion "29.0.1"

Answer 2

For those who do not want to wait for support library released, you can use nightly build like this

repositories {
        maven {
            url "https://ci.android.com/builds/submitted/5795878/androidx_snapshot/latest/repository/"
        }
    }

implementation group: 'androidx.biometric', name: 'biometric', version: '1.0.0-SNAPSHOT'

get build version from here

https://ci.android.com/builds/branches/aosp-androidx-master-dev/

branch aosp-androidx-master-dev

show latest build from androidx-snapshot