Biometric-Auth

Add Biometric Authentication to any Android app

This library based on https://github.com/anitaa1990/Biometric-Auth-Sample. It is kotlin version with some improvements.

This library provides an easy way to implement fingerprint authentication without having to deal with all the boilerplate stuff going on inside.

How to integrate the library in your app?

Usage

val dialogV23: BiometricDialogV23Interface = ....
        BiometricManager(
            this@MainActivity,
            "Title",
            "Subtitle example",
            "Description example",
            "Cancel",
            "Error text",
            dialogV23
        ).authenticate(biometricCallback)

The BiometricDialogV23Interface interface for dialog to support devices before BiometricPrompt. You can found implementation in example app

The BiometricCallback class has the following callback methods:

BiometricCallback {
              override fun onSdkVersionNotSupported() {
                     /*  
                      *  Will be called if the device sdk version does not support Biometric authentication
                      */
               }
               override fun onBiometricAuthenticationNotSupported() {
                     /*  
                      *  Will be called if the device does not contain any fingerprint sensors 
                      */
               }
               override fun  onBiometricAuthenticationNotAvailable() {
                    /*  
                     *  The device does not have any biometrics registered in the device.
                     */
               }
               override fun onBiometricAuthenticationPermissionNotGranted() {
                      /*  
                       *  android.permission.USE_BIOMETRIC permission is not granted to the app
                       */
               }
                override fun onBiometricAuthenticationInternalError(error: String) {
                     /*  
                      *  This method is called if one of the fields such as the title, subtitle, 
                      * description or the negative button text is empty
                      */
               }
               override fun  onAuthenticationFailed() {
                      /*  
                       * When the fingerprint doesn’t match with any of the fingerprints registered on the device, 
                       * then this callback will be triggered.
                       */
               }
               override fun  onAuthenticationCancelled() {
                       /*  
                        * The authentication is cancelled by the user. 
                        */
               }
               override fun  onAuthenticationSuccessful() {
                        /*  
                         * When the fingerprint is has been successfully matched with one of the fingerprints   
                         * registered on the device, then this callback will be triggered. 
                         */
               }
               override fun  onAuthenticationHelp(helpCode: Int, helpString: CharSequence) {
                         /*  
                          * This method is called when a non-fatal error has occurred during the authentication 
                          * process. The callback will be provided with an help code to identify the cause of the 
                          * error, along with a help message.
                          */
                }
               override fun  onAuthenticationError(errorCode: Int, errString: CharSequence) {
                         /*  
                          * When an unrecoverable error has been encountered and the authentication process has 
                          * completed without success, then this callback will be triggered. The callback is provided 
                          * with an error code to identify the cause of the error, along with the error message. 
                          */
                 }
              })