Android-BiometricManager 指紋登入

主要物件：

BiometricManager

-檢查使用者是否有指紋辨識or是否設置密碼

BiometricPrompt

-初始化指紋視窗 並且 呼叫指紋視窗

BiometricPromptInfo

-指紋視窗的一些設定 Title , Description ...

Coding:

這邊會先建議建立 BiometricManager

主要是因為,他能判斷使用者是否有支持指紋或者設置Pin碼

• BIOMETRIC_ERROR_NO_HARDWARE：沒有指紋
• BIOMETRIC_ERROR_HW_UNAVAILABLE：沒有獲取到硬體
• BIOMETRIC_ERROR_NONE_ENROLLED：沒有設定生物辨識

val biometricManager = BiometricManager.from(this) 
when (biometricManager.canAuthenticate()) {     
BiometricManager.BIOMETRIC_SUCCESS ->         
  Log.d("TAG", "App can authenticate using biometrics.")     
BiometricManager.BIOMETRIC_ERROR_NO_HARDWARE ->        
   Log.e("TAG", "No biometric features available on this device.") 
BiometricManager.BIOMETRIC_ERROR_HW_UNAVAILABLE ->         
   Log.e("TAG", "Biometric features are currently unavailable.") 
BiometricManager.BIOMETRIC_ERROR_NONE_ENROLLED ->        
   Log.e("TAG", "The user hasn't associated any biometric credentials with their account.") 
}

建立 executors and callback(BiometricPrompt.AuthenticationCallback)

val executors = ContextCompat.getMainExecutor(this)
val callback = object : BiometricPrompt.AuthenticationCallback(){
    override fun onAuthenticationError(errorCode: Int, errString: CharSequence) {
        super.onAuthenticationError(errorCode, errString)
    }

    override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
        super.onAuthenticationSucceeded(result)
        finish()
        startActivity(Intent(this@LoginActivity,MainActivity::class.java))
    }

    override fun onAuthenticationFailed() {
        super.onAuthenticationFailed()
    }
}

再來 建立 BiometricPromptInfo

val biometricPromptInfo = BiometricPrompt.PromptInfo.Builder()
        .setTitle("Authentication")
        .setDescription("")
        .setDeviceCredentialAllowed(true)
        .build()

最後 BiometricPrompt

biometricPrompt.authenticate ->呼叫指紋

biometricPrompt = BiometricPrompt(this, executors, callback) 
biometricPrompt.authenticate(biometricPromptInfo)

結果：

GitHub: