如何使用 BiometricManager 或 BiometricPrompt 检查生物识别硬件是否

Question

我正在使用 BiometricPrompt 类实现生物识别身份验证。在调用方法之前如何检查硬件是否可用BiometricPrompt#authenticate？如何查看是否已登记生物识别？如何调用BiometricManager#canAuthenticate方法？我无法在 kotlin 中为 BiometricManager 类创建对象我当前的实现如下。    val executor = Executors.newSingleThreadExecutor()    val biometricPrompt = BiometricPrompt(this, executor, object : BiometricPrompt.AuthenticationCallback() {        override fun onAuthenticationError(errorCode: Int, errString: CharSequence) {            super.onAuthenticationError(errorCode, errString)            Log.d("BIOMETRIC", "$errString $errorCode")            if (BiometricPrompt.ERROR_HW_NOT_PRESENT == errorCode || BiometricPrompt.ERROR_NO_BIOMETRICS == errorCode)                PreferenceHandler.setBiometricAvailable(this@LockActivity, false)            else                PreferenceHandler.setBiometricAvailable(this@LockActivity, true)        }        override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {            super.onAuthenticationSucceeded(result)        }        override fun onAuthenticationFailed() {            super.onAuthenticationFailed()            Log.d("BIOMETRIC", "FAILED")        }    })    val promptInfo = BiometricPrompt.PromptInfo.Builder()            .setTitle("App title")            .setSubtitle("")            .setDescription("Identify yourself by Biometrics")            .setNegativeButtonText("Use Password")            .build()    biometricPrompt.authenticate(promptInfo)

Answer 1

问题终于解决了

BiometricManagerandroidx 库中错过了课程

androidx.biometric:biometric:1.0.0-alpha04

将库版本更新为

androidx.biometric:biometric:1.0.0-beta01

现在您可以导入androidx.biometric.BiometricManager

您可以通过以下代码检查生物识别硬件的可用性并已注册生物识别：

object BiometricUtil {

fun isHardwareAvailable(context: Context): Boolean{

    return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){

        val bm = BiometricManager.from(context)

        val canAuthenticate = bm.canAuthenticate()

        !(canAuthenticate == BiometricManager.BIOMETRIC_ERROR_NO_HARDWARE || canAuthenticate == BiometricManager.BIOMETRIC_ERROR_HW_UNAVAILABLE)

    } else {

        false

    }

}

fun hasBiometricEnrolled(context: Context): Boolean {

    return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){

        val bm = BiometricManager.from(context)

        val canAuthenticate = bm.canAuthenticate()

        (canAuthenticate == BiometricManager.BIOMETRIC_SUCCESS)

    } else {

        false

    }

}

}