带有试用期的 Android In-App Billing V5 订阅

Question

谷歌已经更新了它的计费系统，没有完整的信息如何处理它。
因此，而不是 SkyDetails我们有课ProductDetails .我们可以在 billingClient.queryProductDetailsAsync() 的回调中接收到这个对象.然后我们可以调用getSubscriptionOfferDetails()在此对象上并获得对 ProductDetails.PricingPhases 列表的访问权限.例如，如果产品有 2 个报价(基本报价和试用报价)，我们会得到 2 个 ProductDetails.PricingPhases 的列表.
然后当用户想购买我们使用的产品时(来自官方文档):

val offerToken = productDetails.offerDetails(selectedOfferIndex).offerToken

什么是 selectedOfferIndex ?我们应该总是选择第一个项目还是取决于它？
提前感谢大家。

Answer 1

例如，您有 2 个这样的订阅(2 个产品)

[
  ProductDetails{
    parsedJson={
      "productId": "...",
      "subscriptionOfferDetails": [
        {
          "offerIdToken": "...token_1...",
          "pricingPhases": [
            {
              "priceAmountMicros": 631000000000,
              "priceCurrencyCode": "VND",
              "formattedPrice": "₫631,000",
              "billingPeriod": "P6M",
              
            }
          ]
        }
      ]
    }
  },
  ProductDetails{
    parsedJson={
      "productId": "...",
      "subscriptionOfferDetails": [
        {
          "offerIdToken": "...token_2...",
          "pricingPhases": [
            {
              "priceAmountMicros": 0,
              "priceCurrencyCode": "VND",
              "formattedPrice": "Free",
              "billingPeriod": "P1M",
              "recurrenceMode": 2,
              "billingCycleCount": 1
            },
            {
              "priceAmountMicros": 112000000000,
              "priceCurrencyCode": "VND",
              "formattedPrice": "₫112,000",
              "billingPeriod": "P6M",
              
            }
          ],
          {
            "offerIdToken": "...token_3...",
            "pricingPhases": [
              {
                "priceAmountMicros": 631000000000,
                "priceCurrencyCode": "VND",
                "formattedPrice": "₫631,000",
                "billingPeriod": "P6M",
              }
            ]
          }
        }
      ]
    }
  }
]

在第二次订阅时购买第一个计划(免费试用 1 个月)的示例(ProductDetails)

val productDetails2 = ...
val offerToken = "...token_2..."
// val offerToken = productDetails2.subscriptionOfferDetails.get(0).offerToken
// in json response, it name is offerIdToken but after parse it's offerToken

val productDetailsParamsList =
    listOf(
        BillingFlowParams.ProductDetailsParams.newBuilder()
            .setProductDetails(productDetails2)
            .setOfferToken(offerToken)
            .build()
    )
val billingFlowParams = BillingFlowParams.newBuilder()
        .setProductDetailsParamsList(productDetailsParamsList)
        .build()

billingClient.launchBillingFlow(this, billingFlowParams)