import org.solovyev.android.checkout.RequestListener; //导入依赖的package包/类
@Override
protected void doVerify(@NonNull final List<Purchase> purchases, @NonNull final RequestListener<List<Purchase>> listener) {

    // Prepare params
    Purchase purchase = purchases.get(0);
    boolean isSubscription = Configuration.getSubscriptionProductIds().contains(purchase.sku);
    String purchaseType = isSubscription ? "subscription" : "product";

    // Post purchase verification request
    ApiRequestHandler apiRequestHandler = new ApiRequestHandler(Configuration.getPurchaseConfirmationUrl(purchaseType));
    PurchasesVerificationPayload purchasesVerificationPayload = new PurchasesVerificationPayload(purchase);
    boolean result = apiRequestHandler.post(purchasesVerificationPayload);

    // Trigger success
    if(result) {
        listener.onSuccess(purchases);
    }else{
        listener.onError(apiRequestHandler.getStatusCode(), new PurchaseVerificationException(apiRequestHandler.getResponseText()));
    }

}
 

import org.solovyev.android.checkout.RequestListener; //导入依赖的package包/类
private <T> RequestListener<T> makeRequestListener() {
    return new RequestListener<T>() {
        @Override
        public void onSuccess(@Nonnull T result) {
            reloadInventory();
        }

        @Override
        public void onError(int response, @Nonnull Exception e) {
            reloadInventory();
            e.printStackTrace();
        }
    };
}
 

import org.solovyev.android.checkout.RequestListener; //导入依赖的package包/类
private void purchase(Sku sku) {
    final RequestListener<Purchase> listener = makeRequestListener();
    mCheckout.startPurchaseFlow(sku, null, listener);
}