In addition to activities and layouts, Android apps often need extra resources such as image files and application data. The first is an element. A: Yes, purely so that you can see how to update text in the layout. Next, we’re going to refine the app. Layouts only define the appearance of the app. Rather than edit the XML (such as that shown on the next page), you can use the design editor, which allows you to drag GUI components onto your layout, and arrange them how you want. Android Studio launches the emulator for you. Let’s take a closer look at it. The package name must stay the same for the lifetime of your app. So let’s dive in and create a basic Android app. An activity is a single, defined thing that your user can do. Add to My Bookmarks Export citation. List: LD7026: Mobile App Development Next: Android App Development Previous: Android Application Development for Dummies. Double-click on the file you want to work with, and the file’s contents will appear in the middle of the Android Studio window. We’ll continue setting up the AVD on the next page. First, the emulator fires up in a separate window. In order to read or download Head First Android Development 2e ebook, you need to create a FREE account. When you choose the code editor option, the content of activity_main.xml is displayed. Q: Can I write Android apps without using an IDE? An Android app is really just a bunch of valid files in a particular folder structure, and Android Studio sets all of this up for you when you create a new app. Another way to prevent getting this page in the future is to use Privacy Pass. The emulator enables you to set up one or more Android virtual devices (AVDs) and then run your app in the emulator as though it’s running on a physical device. And now, we gift cap you compulsion quickly. Q: Am I right in thinking we’re hardcoding the text that’s displayed? First, check the Android Studio system requirements here: Then follow the Android Studio installation instructions here: Once you’ve installed Android Studio, open it and follow the instructions to add the latest SDK tools and Support Libraries. Type Book Author(s) Dawn Griffiths, David Griffiths Date 2017 Publisher O'Reilly Media, Inc, USA Pub place Sebastopol Edition 2nd Revised edition ISBN-13 9781491974056. Every Android app is a collection of screens, and each screen is composed of an activity and a layout. It’s like a JAR file for Android apps, and contains your app’s bytecode, libraries, and resources. Exercise your consumer rights by contacting us at donotsell@oreilly.com. Here’s what the app will look like: Whenever you create a new app, you need to create a new project for it. I thought you said most developers use Android Studio. On the next screen, you’ll be asked to verify the AVD configuration. The great news is that all of the powerful Android libraries are exposed through the APIs in the application framework, and it’s these APIs that you use to create great Android apps. You can choose the version of Android you want to be on your AVD. As you can see, the code contains two elements. A: It’s possible, but it’s more work. Getting Started: Diving In. This element is used to display text to the user, in our case the sample text “Hello World!”. You can download the full code for the chapter from https://tinyurl.com/HeadFirstAndroid. Android Studio uses the company domain and application name to form the name of the package that will be used for your app. We’ll explain things along the way, but you’ll need to have a fair understanding of Java to get the most out of this book. This is a type of layout element that tells Android how to display components on the device screen. Let’s take a look at what’s included. We’ve left out some of the details you don’t need to think about just yet; we’ll cover them in more detail through the rest of the book. But quite a lot of people use IntelliJ IDEA instead. Q: The folders in my project explorer pane look different from yours. The emulator is built on an existing emulator called QEMU (pronounced “queue em you”), which is similar to other virtual machine applications you may have used, like VirtualBox or VMWare.

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