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Hands-On Android UI Development

Hands-On Android UI Development

By : Jason Morris
3.8 (4)
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Hands-On Android UI Development

Hands-On Android UI Development

3.8 (4)
By: Jason Morris

Overview of this book

A great user interface (UI) can spell the difference between success and failure for any new application. This book will show you not just how to code great UIs, but how to design them as well. It will take novice Android developers on a journey, showing them how to leverage the Android platform to produce stunning Android applications. Begin with the basics of creating Android applications and then move on to topics such as screen and layout design. Next, learn about techniques that will help improve performance for your application. Also, explore how to create reactive applications that are fast, animated, and guide the user toward their goals with minimal distraction. Understand Android architecture components and learn how to build your application to automatically respond to changes made by the user. Great platforms are not always enough, so this book also focuses on creating custom components, layout managers, and 2D graphics. Also, explore many tips and best practices to ease your UI development process. By the end, you'll be able to design and build not only amazing UIs, but also systems that provide the best possible user experience.
Table of Contents (15 chapters)
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13
Activity Lifecycle

Listening for some events


When listening for user-interface events in Android, you'll typically hook up a listener object of some sort to the widgets you want to receive events on. However, how the listener object is defined may follow a number of different patterns, and listeners can take a number of different forms. You'll often see a simple anonymous class being defined as the listener, which is something like this:

closeButton.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
    finish();
  }
});

However, while this pattern is common (especially because the much shorter lambda syntax was only introduced in Java 8, and Android didn't properly support it until 2017), it's not always your best choice for several reasons:

  • This anonymous class is not reusable at all. It serves one purpose, for a single object in the entire application.
  • You just allocated a new object that will also need to be garbage collected. This is not a big deal, but can sometimes...

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