'canAuthenticate()' 在 android 中已弃用答案

【问题标题】：'canAuthenticate()' is deprecated in android'canAuthenticate()' 在 android 中已弃用
【发布时间】：2021-07-19 12:42:53
【问题描述】：

我应该使用什么来代替 biometricManager.canAuthenticate() 已被弃用。

Doc 说

此方法已弃用。请改用 canAuthenticate(int)。

    BiometricManager biometricManager = BiometricManager.from(this);
    switch (biometricManager.canAuthenticate()){
        case BiometricManager.BIOMETRIC_ERROR_HW_UNAVAILABLE:
            break;
        case BiometricManager.BIOMETRIC_ERROR_NO_HARDWARE:
            break;
        case BiometricManager.BIOMETRIC_SUCCESS:
            break;
        case BiometricManager.BIOMETRIC_ERROR_NONE_ENROLLED:
            break;
        case BiometricManager.BIOMETRIC_ERROR_UNSUPPORTED:
            break;
    }

canAuthenticate(int)的使用方法如上。

【问题讨论】：

标签： java android deprecated

【解决方案1】：

您的代码的直接替换如下所示：

switch (canAuthenticate(Authenticators.BIOMETRIC_WEAK)) {
   case ...
}

根据javadoc，可能的返回值为BIOMETRIC_SUCCESS、BIOMETRIC_ERROR_HW_UNAVAILABLE、BIOMETRIC_ERROR_NONE_ENROLLED、BIOMETRIC_ERROR_NO_HARDWARE或BIOMETRIC_ERROR_SECURITY_UPDATE_REQUIRED.，和以前一样。

【讨论】：

【解决方案2】：

canAuthenticate() 上的默认实现已弃用，因为它仅支持 Authenticators.BIOMETRIC_WEAK

使用以下新实现：

BiometricManager.from(context).canAuthenticate(BiometricManager.Authenticators.BIOMETRIC_WEAK)

支持以下认证机制：

public interface Authenticators {
        /**
         * Any biometric (e.g. fingerprint, iris, or face) on the device that meets or exceeds the
         * requirements for <strong>Class 3</strong> (formerly <strong>Strong</strong>), as defined
         * by the Android CDD.
         */
        int BIOMETRIC_STRONG = 0x000F;

        /**
         * Any biometric (e.g. fingerprint, iris, or face) on the device that meets or exceeds the
         * requirements for <strong>Class 2</strong> (formerly <strong>Weak</strong>), as defined by
         * the Android CDD.
         *
         * <p>Note that this is a superset of {@link #BIOMETRIC_STRONG} and is defined such that
         * {@code BIOMETRIC_STRONG | BIOMETRIC_WEAK == BIOMETRIC_WEAK}.
         */
        int BIOMETRIC_WEAK = 0x00FF;

        /**
         * The non-biometric credential used to secure the device (i.e. PIN, pattern, or password).
         * This should typically only be used in combination with a biometric auth type, such as
         * {@link #BIOMETRIC_WEAK}.
         */
        int DEVICE_CREDENTIAL = 1 << 15;
    }

【讨论】：