Test In-App-Purchase in Codename One simulator results in Null Pointer Exception

Question

Instead of creating a light and a full version of my app, I decided to go the freemium way and offer a button to upgrade from the light to the full version.

The application is only available on the Google Play Store. So I created an in app purchase in the Play Store as described http://mobilecodetogo.blogspot.fr/2013/03/android-does-it-better-in-app-purchase.html.

Here is the code that I implemented :

if (buyFull) {

              if (ParametresGeneraux.getPurchase().isManagedPaymentSupported()) {
                  String[] skus = {"ParametresGeneraux.getFullVersionSKU()"};

                   if (ParametresGeneraux.getPurchase().isItemListingSupported()) {
                     Product[] products = ParametresGeneraux.getPurchase().getProducts(skus);
                     String items = "";

                     if (products != null) {
                       for (Product p : products) {
                          items += p.getDescription();
                       }
                     }

                     Dialog.show("Produits intégrés", "Les produits intégrés sont " + items,
                                                         "OK", "Cancel");
                 }

                 // On achète
                 ParametresGeneraux.getPurchase().purchase("ParametresGeneraux.getFullVersionSKU()");
           } else {
                   Dialog.show("Évolution impossible", "Impossible d'évoluer vers la version complète. Votre compte n'a pas été débité.", "OK", "Compris");
                  }

Where ParametresGeneraux.getPurchase() is doing Purchase.getInAppPurchase().

When I test it on the simulator with an Android skin (Nexus 5) the listing is not shown and it always results in a null pointer exception after executing the purchase :

java.lang.NullPointerException
at com.codename1.impl.javase.JavaSEPort$82$5$1.run(JavaSEPort.java:7936)
at com.codename1.ui.Display.processSerialCalls(Display.java:1152)
at com.codename1.ui.Display.edtLoopImpl(Display.java:1096)
at com.codename1.ui.Display.mainEDTLoop(Display.java:997)
at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)
at com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:176)

On the contrary on the device few hours after submitting the app, the purchase is charged (so item is found and not null). However when I restart the app it is still in light version.

Here is how I test if it is a light version (in the init method from the main class) :

    ParametresGeneraux.setPurchase(Purchase.getInAppPurchase());
    ParametresGeneraux.setLightVersion(true);
    if (ParametresGeneraux.getPurchase().isManagedPaymentSupported()) {
        if (ParametresGeneraux.getPurchase().wasPurchased(ParametresGeneraux.getFullVersionSKU())) {
            ParametresGeneraux.setLightVersion(false);
        }
    }

According to this 2014 SO question (and the mentioned RFE that has been closed since then) I assume wasPurchased should also work on Android. So I don't know why it does not work.

Actually my questions are :

Is it possible to test in app purchase with the simulator ?

Is wasPurchased the right method to pick up to check whether the user has bought the feature ?

Thanks a lot for giving me hints!

FYI When you get an exception especially in the simulator and are asking about it the expectation is that you include the stack trace — Shai Almog

Shai Almog Shai Almog · Accepted Answer · 2016-11-09T05:47:06

The simulator doesn't connect to google play and can return null for things you expect to be there. Notice that there are API's that indicate things such as if item listing is supported etc.

You can manipulate some elements of the purchase API via the simulator menu.

Test In-App-Purchase in Codename One simulator results in Null Pointer Exception

2 Answers