![]() ![]() For example, developers will often separate the classes that work with data and the classes that build the UI into different packages. Create different packages for different parts of your code.There are two ways in which you can make use of packages. Notice that the name of the package consists of several words separated by a period.They should look similar to the screenshot below, which shows three packages, one for your code ( ), and two for test files ( (androidTest) and (test)). In Android Studio, in the Project window ( Android), take a look at your new project files under app > java for the Affirmations app.In the same way that you can organize paperwork into files and folders, you can organize your code into files and packages. Organizing your code logically helps you and other developers understand, maintain, and extend it. Now that you have added string resources, you can reference them in your code as R.string.affirmation1 or R.string.affirmation2. The strings.xml file should look like this when you're done. I will be present in all the moments that this day brings. Things will unfold at precisely the right time. ![]() New opportunities await me at every turn. Good things are always coming into my life. Name them affirmation1, affirmation2, and so on.Įach day is a new opportunity to grow and be a better version of myself.Įvery challenge in my life is an opportunity to learn from. In strings.xml, add the following affirmations as individual string resources.This file currently has a single resource which is the name of the app. In the Project window, open app > res > values > strings.xml.Networking and databases are beyond the scope of this codelab, so you will use a list of affirmations strings defined inside the app. Note: In most production Android projects, you would retrieve the affirmations data from a database or from a server. A source of data to provide a list of affirmations to your app.String resources to display as affirmations in the app.You will add the following to your project. The next step in creating the Affirmations app is to add resources. Enter Affirmations as the app Name, as the Package name, and choose API Level 19 as the Minimum SDK.Start a new Kotlin project in Android Studio using the Empty Activity template.A computer with Android Studio version 4.1 or higher installed.īefore creating a new project, make sure that you are on Android Studio 4.1 or higher.An app that displays a list of affirmation strings using a RecyclerView.How to use adapters with RecyclerView to customize how an individual list item looks.How to organize your code into packages.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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