The instructions in this codelab assume that you have this or a later version of Android Studio. Android Studio 4.1 or later installed.A computer with Android Studio installed.An app that displays a list of affirmation strings using a RecyclerView.How to use adapters to customize how an individual list item looks.How to use a RecyclerView to display a list of data.Use the documentation on for classes provided by the Android framework.Inherit from an existing class and override its methods.
Understand classes and inheritance in Kotlin (including abstract classes).Create a project from a template in Android Studio.Then, in the follow-up codelab, you will take it a step further, add an inspiring image to each affirmation, and polish the app UI. Affirmations is a simple app that displays ten positive affirmations as text in a scrolling list. In this codelab, you will build the Affirmations app. After that view scrolls off the screen, RecyclerView reuses the view for new data, XYZ. In the sequence shown below, you can see that one view has been filled with data, ABC. This RecyclerView behavior saves a lot of processing time and helps lists scroll more smoothly. That means, the item is filled with new content that scrolls onto the screen. When a list item is scrolled off the screen, RecyclerView reuses that view for the next list item about to be displayed. RecyclerView is designed to be very efficient, even with large lists, by reusing, or recycling, the views that have scrolled off the screen. To help you build apps with lists, Android provides the RecyclerView. No matter what the content is, displaying a list of data is one of the most common UI tasks in Android. As shown in the screenshot below, some of these apps display a simple list of words or phrases, where others display more complex items such as cards that include text and images. The call history screen, the contacts app, and your favorite social media app all display a list of data. If you think about the apps you commonly use on your phone, almost every single app has at least one list.
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