Publishing Your Games - Android Games Practical Programming by Example - page 130

billing system to make sure that the purchase has been made by calling the queryInvent-
oryAsync() method of the mHelper object.
Next, the mConsumeFinishedListener listener is designed to receive the notification when
the consumption operation has completed and then handle the consumption response from
Google Play.
//Queries the billing system to make sure that the purchase has been made
public void consumePurchasedItem() {
mHelper.queryInventoryAsync( mReceivedInventoryListener );
}
//Consumes the item via a call to the consumeAsync() method of the mHelper object
IabHelper.QueryInventoryFinishedListener mReceivedInventoryListener
= new IabHelper.QueryInventoryFinishedListener() {
public void onQueryInventoryFinished(IabResult result,
Inventory inventory) {
if (result.isFailure()) {
// Handles failure
} else {
mHelper.consumeAsync(inventory.getPurchase(ITEM_SKU),
mConsumeFinishedListener);
}
}
};
//Handles the consumption response from Google Play
IabHelper.OnConsumeFinishedListener mConsumeFinishedListener
= new IabHelper.OnConsumeFinishedListener() {
public void onConsumeFinished(Purchase purchase,IabResult result){
if (result.isSuccess()) {
// Handles success
//provision the in-app purchase to the user
// (for ex, credit 50 gold coins to player's character)
} else {
// handles error
}
}
};