isaidamier

def biometric_version = '1.0.0'
implementation "androidx.biometric:biometric:$biometric_version"

isaidamier

private lateinit var biometricPrompt: BiometricPrompt

override fun onCreate(savedInstanceState: Bundle?) {
   super.onCreate(savedInstanceState)
   setContentView(R.layout.activity_main)
   setSupportActionBar(findViewById(R.id.toolbar))
   // ...   
   biometricPrompt = createBiometricPrompt()
}

isaidamier

private fun createPromptInfo(): BiometricPrompt.PromptInfo {
   val promptInfo = BiometricPrompt.PromptInfo.Builder()
           .setTitle(getString(R.string.prompt_info_title))
           .setSubtitle(getString(R.string.prompt_info_subtitle))
           .setDescription(getString(R.string.prompt_info_description))
           // Authenticate without requiring the user to press a "confirm"
           // button after satisfying the biometric check
           .setConfirmationRequired(false)
           .setNegativeButtonText(getString(R.string.prompt_info_use_app_password))
           .build()

isaidamier

override fun onAuthenticationError(errorCode: Int, errString: CharSequence) {
   super.onAuthenticationError(errorCode, errString)
   Log.d(TAG, "$errorCode :: $errString")
   if(errorCode == BiometricPrompt.ERROR_NEGATIVE_BUTTON) {
       loginWithPassword() // Because negative button says use application password
   }
}

isaidamier

// Callback for the "authenticate" button in your app's UI.
override fun onClick(view: View) {
   val promptInfo = createPromptInfo()
   if (BiometricManager.from(context)
               .canAuthenticate() == BiometricManager.BIOMETRIC_SUCCESS) {
       biometricPrompt.authenticate(promptInfo, cryptoObject)
   } else {
       loginWithPassword()
   }
}

isaidamier

override fun onClick(view: View) {
   val promptInfo = createPromptInfo()
   if (BiometricManager.from(context)
               .canAuthenticate() == BiometricManager.BIOMETRIC_SUCCESS) {
       biometricPrompt.authenticate(promptInfo)
   } else {
       loginWithPassword()
   }
}

isaidamier

override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
   super.onAuthenticationSucceeded(result)
   Log.d(TAG, "Authentication was successful")
   showMessage()
}

isaidamier

interface CryptographyManager {

    /**
     * This method first gets or generates an instance of SecretKey and then initializes the Cipher
     * with the key. The secret key uses [ENCRYPT_MODE][Cipher.ENCRYPT_MODE] is used.
     */
    fun getInitializedCipherForEncryption(keyName: String): Cipher

    /**
     * This method first gets or generates an instance of SecretKey and then initializes the Cipher

isaidamier

def biometric_version = '1.0.1'
implementation "androidx.biometric:biometric:$biometric_version"

isaidamier

class MainActivity : AppCompatActivity() {
  ...
   private lateinit var biometricPrompt: BiometricPrompt
   ...

   override fun onCreate(savedInstanceState: Bundle?) {
       super.onCreate(savedInstanceState)
       setContentView(R.layout.activity_main)
       ...
       biometricPrompt = createBiometricPrompt()