android - Google Pay SDK 检查用户是否已添加特定卡

Question

Google Pay API 是否有检查用户是否已将特定卡添加到 Google Pay 的方法？我知道有一种方法可以检查用户是否可以付款。

From official docs:
... call the isReadyToPay API to determine if the user can make payments with the Google Pay API.

private void possiblyShowGooglePayButton() {
    final Optional<JSONObject> isReadyToPayJson = PaymentsUtil.getIsReadyToPayRequest();
    if (!isReadyToPayJson.isPresent()) {
      return;
    }
    IsReadyToPayRequest request = IsReadyToPayRequest.fromJson(isReadyToPayJson.get().toString());
    if (request == null) {
      return;
    }

    // The call to isReadyToPay is asynchronous and returns a Task. We need to provide an
    // OnCompleteListener to be triggered when the result of the call is known.
    Task<Boolean> task = mPaymentsClient.isReadyToPay(request);
    task.addOnCompleteListener(this,
        new OnCompleteListener<Boolean>() {
          @Override
          public void onComplete(@NonNull Task<Boolean> task) {
            if (task.isSuccessful()) {
              setGooglePayAvailable(task.getResult());
            } else {
              Log.w("isReadyToPay failed", task.getException());
            }
          }
        });
  }

但是上面的代码👆🏻不符合我的需求。也许有人对此有解决方案？

Answer 1

特定卡片是什么意思？

documentation 中很容易遗漏的一件事existingPaymentMethodRequired。

默认情况下，API 会检查设备/应用程序是否可用于付款，但传递 existingPaymentMethodRequired 选项将检查它们是否具有用户可以使用的现有付款方式付款。