Step #2: Adding Support for RecyclerView

The idea is that the ToDo app will present a list of tasks to be done. That requires that we have something to display a list to the user. There are two typical solutions for that problem: ListView and RecyclerView. RecyclerView is more modern and more flexible, so it is a good choice for this problem.

However, ListView does have one advantage over RecyclerView: ListView is part of the framework portion of the Android SDK, and so it is always available to apps. RecyclerView requires us to add a dependency to the app.

Fortunately, we happen to be in a tutorial where we are working with the dependencies in the app.

To that end, inside the dependencies closure, add the following line:

  implementation "androidx.recyclerview:recyclerview:1.2.1"

At this point, you should get a banner at the top of the editor, offering you the chance to “Sync Now”:

Go ahead and click the “Sync Now” link in the banner at the top of the editor.