Android 触发PurchasesUpdatedListener回调时，billingClient.launchBillingFlow之前设置的成员变量丢失

I'm initializing a member variable to null.
Later in the process, this member variable is assigned a value, before starting the payment flow, ie before invoking billingClient.launchBillingFlow(context, billingFlowParams)
When arriving in the PurchasesUpdatedListener callback, the member variable is null again.

我首先认为这是一个作用域问题，所以我设置了一个inner class MyPurchasesUpdatedListener : PurchasesUpdatedListener，以确保在包含类中可以访问包含类成员变量，但这没有什么不同.

所以我认为这是完全不同的东西，比如生命周期，不同的线程/活动隐含在我自己的流中间的计费流中…

我试图将我的代码剥离到最小的有用部分:

    class GooglePlayPay(val context:NativeAppActivity) {

        ...
        var purchaseCallback: ((Boolean)->Unit)?=null
        ...
        private val purchasesUpdatedListener = MyPurchasesUpdatedListener()

        inner class MyPurchasesUpdatedListener : PurchasesUpdatedListener {
            override fun onPurchasesUpdated(billingResult:BillingResult, purchases:List<Purchase>?){
                Log.d("fp_purchUpdatedListener","PurchaseCallback: ${purchaseCallback.toString()}")
                // ===> in catlog: PurchaseCallback: null
                if (billingResult.responseCode == BillingClient.BillingResponseCode.OK && purchases != null) {
                    for (purchase in purchases) {
                        handlePurchase(purchase)
                    }
                } else if (billingResult.responseCode == BillingClient.BillingResponseCode.USER_CANCELED) {
                    // Handle an error caused by a user cancelling the purchase flow.
                } else {
                    // Handle any other error codes.
                }
            }
        }
        
        fun handlePurchase(purchase: Purchase){
            ...
            Log.d("fp_handlePurchase","PurchaseCallback: ${purchaseCallback.toString()}")
            // ===> in catlog: PurchaseCallback: null
            ...
        }

        fun purchaseProduct(productDetails: ProductDetails, cb:(Boolean)->Unit) {
            purchaseCallback = cb
            Log.d("fp_purchaseProduct","2.PurchaseCallback: ${purchaseCallback.toString()}")
            // ===> in catlog: PurchaseCallback: Function1<java.lang.Boolean, kotlin.Unit>

            // Launch the billing flow
            billingClient.launchBillingFlow(context, billingFlowParams)
        }

我不知道它是否重要:这purchaseProduct()是从@JavascriptInterface函数中调用的.

[编辑]此处添加了调用类的摘录:

    class GooglePlayPayJSInterface(val context: WebAppActivity) {

        @JavascriptInterface fun getProduct(str:String) {
            GooglePlayPay(context).getProduct(str, ::getProductCallback)
        }
        fun getProductCallback(details: ProductDetails){
            context.postToJs("""{"data":{"productId":"${details.getProductId()}", "name": "${details.getName()}", "price":"${details.getOneTimePurchaseOfferDetails()?.getFormattedPrice()?:"n/a"}"}}""")
        }


        @JavascriptInterface fun purchase(str:String) {
            GooglePlayPay(context).purchase(str, ::purchaseCallback} )
        }
        fun purchaseCallback(success:Boolean){
            if(success){ context.postToJs("""{"data":{"result":"success"}}""") }
            else { context.postToJs("""{"errcode":"Purchase failed"}""") }
        }

        ...
        
    }

But I don't think there's a problem here: getProduct() and its getProductCallback() work like a charm.
The only difference I see between getProduct+callback and purchase+callback is that:

• purchase被Android的计费流程中断，
• 其中getProduct只是调用API函数(billingClient.startConnection()、billingClient.queryProductDetailsAsync())，然后调用先前存储为成员变量的回调.