Android Impression-Tracker

A sample application to show the implementation of tracking Recyclerview item visibility for a specified interval.

App's Functionality

1. Show a recyclerview with a dummy list.
2. Add an onScrollListener on recyclerview to track items.
3. Using RxJava, RxAndroid, LayoutManager to track currently visible rows on the screen.
4. Only track recyclerview items - if visible for a specified interval. For example - 500 Milliseconds.
5. Return visible rows index position in the callback & get currently visible rows data - which then can be sent to a remote database for saving.
6. Update recyclerview adapter holder background based on tracking logic.

ImpressionTracker.kt

This class is responsible for tracking the recyclerview items.

The class uses RxJava disposable, distinctUntilChanged. throttle operator on a subject to track its visibility.

VisibleRows.kt

This class holds the information about the currently visible rows by implementing findFirstCompletelyVisibleItemPosition & findLastCompletelyVisibleItemPosition on Recyclerview LayoutManager.

Building

You can open the project in Android studio and press run. Android Studio version used to build the project: Arctic fox 2020.3.1

Gradle plugin used in the project will require Java 11.0 to run.

you can set the gradle jdk in Preferences->Build Tools->Gradle->Gradle JDK

Logcat

Demo