In-App purchasing demo

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 #include <QtCore/qdatetime.h>
 #include <jni.h>
 #include <QJniObject>

 #include "androidinapppurchasebackend.h"

 QT_USE_NAMESPACE

 static void purchasedProductsQueried(JNIEnv *, jclass, jlong nativePointer)
 {
     AndroidInAppPurchaseBackend *backend = reinterpret_cast<AndroidInAppPurchaseBackend *>(nativePointer);
     QMetaObject::invokeMethod(backend,
                               "registerReady",
                               Qt::AutoConnection);
 }

 static void registerProduct(JNIEnv *, jclass, jlong nativePointer, jstring productId, jstring price, jstring title, jstring description)
 {
     AndroidInAppPurchaseBackend *backend = reinterpret_cast<AndroidInAppPurchaseBackend *>(nativePointer);
     QMetaObject::invokeMethod(backend,
                               "registerProduct",
                               Qt::AutoConnection,
                               Q_ARG(QString, QJniObject(productId).toString()),
                               Q_ARG(QString, QJniObject(price).toString()),
                               Q_ARG(QString, QJniObject(title).toString()),
                               Q_ARG(QString, QJniObject(description).toString()));
 }

 static void registerPurchased(JNIEnv *, jclass, jlong nativePointer, jstring identifier,
                               jstring signature, jstring data, jstring purchaseToken, jstring orderId, jlong timestamp)
 {
     QDateTime dateTime = QDateTime::fromMSecsSinceEpoch(qint64(timestamp));
     dateTime.setTimeSpec(Qt::LocalTime);

     AndroidInAppPurchaseBackend *backend = reinterpret_cast<AndroidInAppPurchaseBackend *>(nativePointer);
     QMetaObject::invokeMethod(backend,
                               "registerPurchased",
                               Qt::AutoConnection,
                               Q_ARG(QString, QJniObject(identifier).toString()),
                               Q_ARG(QString, QJniObject(signature).toString()),
                               Q_ARG(QString, QJniObject(data).toString()),
                               Q_ARG(QString, QJniObject(purchaseToken).toString()),
                               Q_ARG(QString, QJniObject(orderId).toString()),
                               Q_ARG(QDateTime, dateTime));
 }

 static void purchaseSucceeded(JNIEnv *, jclass, jlong nativePointer, jint requestCode,
                               jstring signature, jstring data, jstring purchaseToken, jstring orderId, jlong timestamp)
 {
     QDateTime dateTime = QDateTime::fromMSecsSinceEpoch(qint64(timestamp));
     dateTime.setTimeSpec(Qt::LocalTime);

     AndroidInAppPurchaseBackend *backend = reinterpret_cast<AndroidInAppPurchaseBackend *>(nativePointer);
     QMetaObject::invokeMethod(backend,
                               "purchaseSucceeded",
                               Qt::AutoConnection,
                               Q_ARG(int, int(requestCode)),
                               Q_ARG(QString, QJniObject(signature).toString()),
                               Q_ARG(QString, QJniObject(data).toString()),
                               Q_ARG(QString, QJniObject(purchaseToken).toString()),
                               Q_ARG(QString, QJniObject(orderId).toString()),
                               Q_ARG(QDateTime, dateTime));
 }

 static void purchaseFailed(JNIEnv *, jclass, jlong nativePointer, jint requestCode, jint failureReason, jstring errorString)
 {
     AndroidInAppPurchaseBackend *backend = reinterpret_cast<AndroidInAppPurchaseBackend *>(nativePointer);
     QMetaObject::invokeMethod(backend,
                               "purchaseFailed",
                               Qt::AutoConnection,
                               Q_ARG(int, int(requestCode)),
                               Q_ARG(int, int(failureReason)),
                               Q_ARG(QString, QJniObject(errorString).toString()));
 }

 static JNINativeMethod methods[] = {
     {"purchasedProductsQueried", "(J)V", (void *)purchasedProductsQueried},
     {"registerProduct", "(JLjava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V", (void *)registerProduct},
     {"registerPurchased", "(JLjava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;J)V", (void *)registerPurchased},
     {"purchaseSucceeded", "(JILjava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;J)V", (void *)purchaseSucceeded},
     {"purchaseFailed", "(JIILjava/lang/String;)V", (void *)purchaseFailed}
 };

 JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *)
 {
     static bool initialized = false;
     if (initialized){
         return JNI_VERSION_1_6;}
     initialized = true;

     JNIEnv *env;
     if (vm->GetEnv((void **)&env, JNI_VERSION_1_6) != JNI_OK){
         return JNI_ERR;}

     jclass clazz = env->FindClass("org/qtproject/qt/android/purchasing/InAppPurchase");
     if (!clazz){
         return JNI_ERR;}

     if (env->RegisterNatives(clazz, methods, sizeof(methods) / sizeof(methods[0])) < 0){
         return JNI_ERR;}

     return JNI_VERSION_1_6;
 }