在androidx生物识别提示中尝试三次失败后关闭提示？

Question

我在我的应用程序中使用 androidX 生物识别提示。我有三个查询，

1. 在计算了三次失败尝试后，是否有关闭提示的选项。

2. 是否有任何选项可以显示密码屏幕，而无需单击使用密码按钮（如果启用设备凭据为真）。

3. 是否有自定义提示框的选项。

Answer 1

1. 提示在 5 次尝试失败后自动关闭。 不过，您可以覆盖 BiometricCallback 并覆盖“onAuthenticationFailed”以计算失败次数

    override fun onAuthenticationFailed() {
           super.onAuthenticationFailed()
           //You can count the number of failed attempts, and call the cancellation signal here, onAuthenticationError will not be called if you do
    }
   
   override fun onAuthenticationError(errorCode: Int, errString: CharSequence) {
           super.onAuthenticationError(errorCode, errString)
           //explains to you in the errString why the authentication failed after *five* attempts
   
    }
   

2. 我不确定，但我认为如果您显示提示，启用凭据为 true，则用户在提示“使用密码”上有一个按钮

   * The user will first be prompted to authenticate with biometrics, but also given the
   * option to authenticate with their device PIN, pattern, or password. Developers should
   * first check {@link KeyguardManager#isDeviceSecure()} before enabling this. If the device
   * is not secure, {@link BiometricPrompt#BIOMETRIC_ERROR_NO_DEVICE_CREDENTIAL} will be
   * returned in {@link AuthenticationCallback#onAuthenticationError(int, CharSequence)}}.
   * Defaults to false.
   *
   * Note that {@link #setNegativeButton(CharSequence, Executor,
   * DialogInterface.OnClickListener)} should not be set if this is set to true.
   *
   * @param allowed When true, the prompt will fall back to ask for the user's device
   *               credentials (PIN, pattern, or password).
   * @return
   */
  @NonNull public Builder setDeviceCredentialAllowed(boolean allowed) {
      mBundle.putBoolean(KEY_ALLOW_DEVICE_CREDENTIAL, allowed);
      return this;
  }

3. only the text on it

val prompt =
            BiometricPrompt.Builder(context).setTitle(title).setSubtitle(subtitleText).setDescription(description)
                .setNegativeButton(negativeButton, executor!!, cancelListener).build()