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：
