Book Image

Android Programming for Beginners

By : John Horton, Paresh Mayani
Book Image

Android Programming for Beginners

By: John Horton, Paresh Mayani

Overview of this book

Android is the most popular OS in the world. There are millions of devices accessing tens of thousands of applications. It is many people's entry point into the world of technology; it is an operating system for everyone. Despite this, the entry-fee to actually make Android applications is usually a computer science degree, or five years’ worth of Java experience. Android Programming for Beginners will be your companion to create Android applications from scratch—whether you’re looking to start your programming career, make an application for work, be reintroduced to mobile development, or are just looking to program for fun. We will introduce you to all the fundamental concepts of programming in an Android context, from the Java basics to working with the Android API. All examples are created from within Android Studio, the official Android development environment that helps supercharge your application development process. After this crash-course, we’ll dive deeper into Android programming and you’ll learn how to create applications with a professional-standard UI through fragments, make location-aware apps with Google Maps integration, and store your user’s data with SQLite. In addition, you’ll see how to make your apps multilingual, capture images from a device’s camera, and work with graphics, sound, and animations too. By the end of this book, you’ll be ready to start building your own custom applications in Android and Java.
Table of Contents (37 chapters)
Android Programming for Beginners
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Note To Self continued


Open up the Note To Self app. As a reminder, if you want to see the completed code and working app after completing this chapter, it can be found in the Chapter 14/Note to self folder. As the actions in this chapter require you to jump around between different files, classes, and methods, I encourage you to follow along with the files from the download bundle opened for reference.

Updating onCreate and preparing the UI

Now, let's prepare our UI. To do so, follow these steps:

  1. In the layout_main.xml file, delete the temporary button with a button ID that we added previously for testing purposes.

  2. In the onCreate method of MainActivity.java, we can delete the anonymous class that handles its clicks. In order to do so, delete the code shown next:

    // Temporary code
    Button button = (Button) findViewById(R.id.button);
    button.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
    
        DialogShowNote dialog = new DialogShowNote();
        dialog.sendNoteSelected...