Firebase Analytics VIEW_ITEM_LIST ITEMS not showing

Question

I am trying to report a VIEW_ITEM_LIST event with some ITEMS inside. Everything is reported properly in the Debug View except for the items. I am not using any custom event. It seems to happen the same problem in both Android and iOS.

Here is my code.

 override fun trackListViewEvent() {
    val eventBundle = Bundle().apply {
        val itemBundle1 = Bundle().apply {
            putString(Param.ITEM_NAME, "name1")
            putString(Param.ITEM_CATEGORY, "Category")
            putString(Param.PRICE, "49.95")
            putString(Param.CURRENCY, "EUR")
        }

        val itemBundle2 = Bundle().apply {
            putString(Param.ITEM_NAME, "name2")
            putString(Param.ITEM_CATEGORY, "Category")
            putString(Param.PRICE, "89.95")
            putString(Param.CURRENCY, "EUR")
        }
            putString(Param.ITEM_LIST_ID, "1234567890")
            putString(Param.ITEM_LIST_NAME, "WhateverListName")
            putString(Param.PRICE, "125.60")
            putString(Param.CURRENCY, "EUR")

            putParcelableArray(Param.ITEMS, arrayOf(itemBundle1, itemBundle2))
        }
    tracking.logEvent(Event.VIEW_ITEM_LIST, eventBundle)
}

In the Logcat I get: W/FA-SVC: Param value can't be null: items

Another problem is that it seems that ITEMS only accepts some parameters. When adding custom parameters I get E/FA: Item cannot contain custom parameters, but when adding NOT custom parameters like FLIGHT_NUMBER I get the same error. And I could not find any explanation on the documentation on which parameters are accepted.

Answer 1

The example code from Google (link) written in Java, converts to this code in Kotlin

val item1 = Bundle()
item1.putString(FirebaseAnalytics.Param.ITEM_NAME, "jeggings")
item1.putString(FirebaseAnalytics.Param.ITEM_CATEGORY, "pants")
val item2 = Bundle()
item2.putString(FirebaseAnalytics.Param.ITEM_NAME, "boots")
item2.putString(FirebaseAnalytics.Param.ITEM_CATEGORY, "shoes")

parameters.putParcelableArray(FirebaseAnalytics.Param.ITEMS, arrayOf(item1, item2))

This does not work: on Emulator I got firebase error 25 and on a device it did not show at all in DebugView). You have to infer the Parcelable. So change the last line to below and you should be fine!

parameters.putParcelableArray(FirebaseAnalytics.Param.ITEMS, arrayOf<Parcelable>(item1, item2))

Answer 2

I've been working on this for some months so I can shed some light in case anyone is having similar problems:

1. Items are not shown in the debug view but they arrive correctly at GTM (if there is not any problem)
2. About errors: firebase updated its errors and now error 23 (and some more) appears.
3. Enhanced ecommerce does not accept custom parameters and there is not a list of accepted parameters, so follow the documentation to see what parameters can be used.
4. To put a list of items in a bundle use:

Bundle().apply{ putParcelabelArray(Param.ITEMS, bundleList.toTypedArray()}

During this months some parameters and events have been deprecated. So you should constantly check if there are any changes. Keep in mind that firebase analytics for web + app will be released soon, maybe it's a good idea implementing directly web + app.