• app written in Java
• app-kotlin is the same as app but written in Kotlin

Creating a scrollable list of elements is a common pattern in mobile application. Using RecyclerView we can list a large data sets or frequently changing one. RecyclerView is an advanced and flexible version of ListView, addressing serveral issues with existing listing views. Here we will build a simple application with RecyclerView

We will build two versions of a simple app (one in Java and one in Kotlin) that displays a list of hard-coded instances of class Link in a RecyclerView. To display items on RecyclerView you need to the following:

• RecyclerView widget added to the activity layout.
• A class extending RecyclerView.Adapter.
• A class extending RecyclerView.ViewHolder.
• Layout for RecyclerView items.

Files we need for this app are shown in the image below.

• app-listadapter building recyclerview with ListAdapter

ListAdapter for RecyclerView has been introduced in Revision 27.1.0 Release of Support Library. ListAdapter uses DiffUtil under the hood to compute list diffs on a background thread. This will help RecyclerView animate changes automatically with less work on the UI thread.