Android生物识别API问题

Question

我想要实现的：提供了使用FingerPrint、FaceId和Iris等不同生物特征登录的选项。我想给出选择使用PIN，密码或模式，以防任何生物传感器不工作。

"onAuthenticationError“问题:当用户单击"Use Password”选项时，它将直接转到BiometricPrompt.ERROR_NEGATIVE_BUTTON.的错误代码检查的回调我关心的是，我需要自己来处理吗？我的意思是，我是否需要显示一个dialogPopUp，我将要求用户输入他/她的电子邮件/用户名和密码，然后他/她可以登录我的应用程序？

我所做的：

依赖关系：

implementation 'androidx.biometric:biometric:1.2.0-alpha01'

MainActivity.kt

    class MainActivity : AppCompatActivity() {

    private lateinit var executor: Executor
    private lateinit var biometricPrompt: BiometricPrompt

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

        executor = ContextCompat.getMainExecutor(this)
        biometricPrompt = createBiometricObject()
    }

    private fun createBiometricObject(): BiometricPrompt {

        return BiometricPrompt(this, executor, object : AuthenticationCallback() {

            override fun onAuthenticationError(errorCode: Int, errString: CharSequence) {
                super.onAuthenticationError(errorCode, errString)

                if (errorCode == ERROR_NEGATIVE_BUTTON && errString == "Use Password") {
                    // Do I need to create my own DialogPopUp?
                }
            }

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

            override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
                super.onAuthenticationSucceeded(result)
            }
        })
    }

    fun loginWithBiometrics(view: View) {
        when (BiometricManager.from(this).canAuthenticate(BIOMETRIC_STRONG)) {
            BiometricManager.BIOMETRIC_SUCCESS -> biometricPrompt.authenticate(
                createPromptInfoForBiometrics()
            )
            BiometricManager.BIOMETRIC_ERROR_NONE_ENROLLED -> Toast.makeText(
                this,
                "Please enroll your biometrics",
                Toast.LENGTH_LONG
            ).show()
            BiometricManager.BIOMETRIC_ERROR_NO_HARDWARE -> Toast.makeText(
                this,
                "Device not compatible",
                Toast.LENGTH_LONG
            ).show()
            BiometricManager.BIOMETRIC_ERROR_HW_UNAVAILABLE -> Toast.makeText(
                this,
                "Sensors are available as off now, please try again later!",
                Toast.LENGTH_LONG
            ).show()
            BiometricManager.BIOMETRIC_ERROR_SECURITY_UPDATE_REQUIRED -> {
                TODO()
            }
            BiometricManager.BIOMETRIC_ERROR_UNSUPPORTED -> {
                TODO()
            }
            BiometricManager.BIOMETRIC_STATUS_UNKNOWN -> {
                biometricPrompt.authenticate(createPromptInfoForBiometrics())
            }
        }
    }

    private fun createPromptInfoForBiometrics(): BiometricPrompt.PromptInfo {
        return BiometricPrompt.PromptInfo.Builder()
            .setTitle("Biometric Login")
            .setSubtitle("Please login with your biometrics")
            .setNegativeButtonText("Use Password")
            .setAllowedAuthenticators(BIOMETRIC_STRONG)
            .build()
    }
}

任何帮助都将不胜感激。

Answer 1

您应该尝试将DEVICE_CREDENTIAL标志传递给setAllowedAuthenticators()。

BiometricPrompt.PromptInfo.Builder()
                .setTitle("Biometric login for my app")
                //..
                .setAllowedAuthenticators(DEVICE_CREDENTIAL or BIOMETRIC_STRONG)
                .build()

但也要确保您在适当的android级别上使用它。根据医生的说法：

注意，在Android11 (API 30)之前，并不支持所有身份验证器类型的组合。具体来说，在API 30之前，仅不支持DEVICE_CREDENTIAL，在API28-29上不支持BIOMETRIC_STRONG \ DEVICE_CREDENTIAL。在受影响的Android版本上设置不受支持的值将导致调用build().

时出现错误。