Should I use intents or listeners?

Question

TL;DR: According to the documentation there are two different ways to purchase a product, which do I use? Do I use an intent or IABHelper.launchPurchaseFlow() ?

According to this documentation, use launchPurchaseFlow(); and attached listener to make a purchase:

IabHelper.OnIabPurchaseFinishedListener mPurchaseFinishedListener = 
    new IabHelper.OnIabPurchaseFinishedListener() {
        public void onIabPurchaseFinished(IabResult result, Purchase purchase)
        {
            //Item bought...? Why should I use this option
        }
};

mHelper.launchPurchaseFlow(this, SKU_GAS, 10001,
       mPurchaseFinishedListener, "bGoa+V7g/yqDXvKRqq+JTFn4uQZbPiQJo4pf9RzJ");

However, according to this documentation, I must use intents and onActivityForResult() to purchase a product:

startIntentSenderForResult(pendingIntent.getIntentSender(),
       1001, new Intent(), Integer.valueOf(0), Integer.valueOf(0),
       Integer.valueOf(0));

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == 1001) {      
        if (resultCode == RESULT_OK) {
            //Item bought...? Why should I use this option
        }
    }
}

Which method should I use to purchase the product? Both options seem extremely similar, but what is the difference, and is one better?

Answer 1

It doesn't matter. If I do use the listener however, IabHelper's launchPurchaseFlow() uses startIntentSenderForResult anyway which calls onActivityResult() when it's finished. So even if I use the listener, I need the onActivityForResult, which they don't mention in the documentation. This link clears that up a bit:

onIabPurchaseFinished never called.