android: Inapp billing: Error response: 7:Item Already Owned

Question

I am learning to implement an in-app billing for my app such that people can for example, donate $ when press the donate button.

The user is allowed to donate more than

Answer 1

I'm using: implementation 'com.android.billingclient:billing:2.0.0' and had the same error on purchase process.

• the point is: before of launching the purchase we should consume the pending purchases.

• please see the code snippet below:

      List skuList = new ArrayList();
      skuList.add(THE_IAP_ID);
      BillingClient.Builder billingClientBuilder = BillingClient.newBuilder(context).setListener(new PurchasesUpdatedListener() {
          @Override
          public void onPurchasesUpdated(BillingResult billingResult, @Nullable List purchases) {
               // here we have to check the result ...
  
          });
  
          billingClientBuilder.enablePendingPurchases();
          billingClient = billingClientBuilder.build();
          billingClient.startConnection(new BillingClientStateListener() {
          @Override
          public void onBillingSetupFinished(BillingResult billingResult) {
              if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK) {
                  // The BillingClient is ready - query purchases.
  
                  Purchase.PurchasesResult pr = billingClient.queryPurchases(BillingClient.SkuType.INAPP);
                  List pList = pr.getPurchasesList();
                  for (Purchase iitem : pList) {
                      ConsumeParams consumeParams = ConsumeParams.newBuilder()
                              .setPurchaseToken(iitem.getPurchaseToken())
                              .build();
                      billingClient.consumeAsync(consumeParams, consumeResponseListener);
                  }
  
                  // process the purchase
              } else {
                  // cancelled or s.e. 
                  ...
              }
          }
  

Best Regards, Have you fun :)