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Home > Mobile > Android Development > Android Programming for Beginners
Android Programming for Beginners
Android Programming for Beginners

Android Programming for Beginners: Learn all the Java and Android skills you need to start making powerful mobile applications

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Android Programming for Beginners

Chapter 2. Java – First Contact

We now have a working Android development environment, and we have built and deployed our first app. It is obvious, however, that autogenerated code by Android Studio is not going to make the next top-selling app on Google Play. We need to explore this autogenerated code in order to understand Android and then begin to build on this useful template. With this aim in mind, in this chapter, we will do the following:

  • See how to get technical feedback from our apps
  • Examine the Java code and UI XML code from our first app
  • Get the first taste of using the Android UI designer
  • Write our first Java code
  • Learn a few core Java fundamentals and how they relate to Android

First, let's see how to find out whether things are going wrong.

Examining the log output

In the previous chapter, we mentioned that our app was running in a debug mode so we could monitor it and get feedback when things go wrong. So, where is all this feedback then?

You might have noticed a whole load of scrolling text at the bottom of the Android Studio window. If not, click on the Android tab at the bottom-left corner of the screen and then make sure that the logcat tab is selected as well, as indicated by the areas highlighted in solid red in the next figure (the dashed red areas will be discussed in a moment):

Examining the log output

You can drag the window to make it taller, just like you can in most other Windows applications.

This is called the logcat or sometimes, it is referred to as the console. It is our app's way of telling us what is going on underneath what the user sees. If the app crashes, the reason or clues about the reason will appear here. If we need to output debugging information, we can do so here as well.

Tip

If you just cannot work out why your app...

Improving our app and deploying again

We will take a more thorough and structured look at Android Studio, in particular the visual designer in the next chapter. For now, I thought it would be good to make a small addition to our UI, as well as write our first few lines of Java code.

Tip

You can get the completed code files for this project in the Chapter 2 folder of the download bundle.

In Android, there are often multiple ways to get the same thing done. Here, we will see how we can refer to a method in our Java code directly from the UI designer or XML code. Then, once we have done this, we will jump to the Java code and write our very own methods that our new UI refers to. Not only that, but we will write code within our methods that both gives an output on the logcat/console and uses a really cool Android feature that pops up a message to the user.

Modifying the UI

Here, we will add a couple of buttons to the screen and we will then see a really fast way to make them actually do something...

Meet Java

Take a look at the MyActivity.java tab. Here, we can see the code that we briefly discussed.

Before we write our own methods to correspond with the methods that our buttons are already wired up to call, let's take a look at Java comments. Java comments are really handy when we are learning to code, as well as for experienced developers too.

Java comments

In programming, it is always a good idea to write messages known as code comments and sprinkle them liberally among your code. This is to remind us what on earth we were thinking at the time we wrote the code. To do this, you simply need to append a double forward slash and then type your comment like this:

// This is a comment and it could be useful

In addition to this, we can use comments to comment out a line of code. Suppose we have a line of code that we temporarily want to disable, then we can do so by adding two forward slashes, like this:

// The code below used to send a message
// Log.i("info","our message...

FAQ

  1. Can you remind me what methods are?

    Methods are containers for our code that can be executed (called) from other parts of our code. Methods are contained within a class.

  2. Like the last, I found this chapter really hard. Do I need to reread it?

    No, as long as you've built the app, you have made enough progress to handle the next chapter. All the blanks in our knowledge will be steadily filled in and replaced with glorious moments of realization as the book progresses.

Summary

In this chapter, we achieved quite a bit. We saw and edited our layout XML file using both the UI designer, as well as through tinkering with the raw code. We took a glimpse at our first Java code and even added our own methods in order to output debugging messages to the console, and pop-up Toast messages to the user.

In the next chapter, we will take a complete guided tour of Android Studio to see exactly where different things get done at the same time, to understand how our projects assets, such as files and folders, are structured, and to learn how to manage them. This will prepare us to take a more in-depth look at the UI design in Chapter 4, Designing Layouts and Chapter 5, Real-World Layouts, and build some significant real-world layouts for our apps.

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Key benefits

  • Kick-start your Android programming career, or just have fun publishing apps to the Google Play marketplace
  • A first-principles introduction to Java, via Android, which means you’ll be able to start building your own applications from scratch
  • Learn by example and build three real-world apps and over 40 mini apps throughout the book

Description

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.

Who is this book for?

Are you trying to start a career in programming, but haven’t found the right way in? Do you have a great idea for an app, but don’t know how to make it a reality? Or maybe you’re just frustrated that “to learn Android, you must know java.” If so, Android Programming for Beginners is for you. You don’t need any programming experience to follow along with this book, just a computer and a sense of adventure.

What you will learn

  • Master the fundamentals of coding Java for Android
  • Install and set up your Android development environment
  • Build functional user interfaces with the Android Studio visual designer
  • Add user interaction, data captures, sound, and animation to your apps
  • Manage your apps' data using the built-in Android SQLite database
  • Find out about the design patterns used by professionals to make top-grade applications
  • • Build, deploy, and publish real Android applications to the Google Play marketplace

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Dec 31, 2015
Length: 698 pages
Edition : 1st
Language : English
ISBN-13 : 9781785889035
Category :
Mobile
Languages :
Java
Concepts :
Android Development
Tools :
Android

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Publication date : Dec 31, 2015
Length: 698 pages
Edition : 1st
Language : English
ISBN-13 : 9781785889035
Category :
Mobile
Languages :
Java
Concepts :
Android Development
Tools :
Android

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Table of Contents

31 Chapters
1. The First App Chevron down icon Chevron up icon
1. The First App
How Java and Android work together
The development environment
What makes an Android app
Our first Android app
FAQ
Summary
2. Java – First Contact Chevron down icon Chevron up icon
2. Java – First Contact
Examining the log output
Improving our app and deploying again
Meet Java
FAQ
Summary
3. Exploring Android Studio Chevron down icon Chevron up icon
3. Exploring Android Studio
The Android Studio guided tour
FAQ
Summary
4. Designing Layouts Chevron down icon Chevron up icon
4. Designing Layouts
Exploring Android UI design
Structure of a UI design
Summary
5. Real-World Layouts Chevron down icon Chevron up icon
5. Real-World Layouts
Building a real-world UI
Summary
6. The Life and Times of an Android App Chevron down icon Chevron up icon
6. The Life and Times of an Android App
Introduction to the Android lifecycle
A simplified explanation of the Android lifecycle
Lifecycle phases – what we need to know
Lifecycle phases – what we need to do
The lifecycle demonstration app
The structure of Java code – revisited
Summary
7. Coding in Java Part 1 – Variables, Decisions, and Loops Chevron down icon Chevron up icon
7. Coding in Java Part 1 – Variables, Decisions, and Loops
Java is everywhere
Syntax and jargon
More code comments
Storing and using data with variables
Changing values in variables with operators
Expressing yourself demo app
Decisions
Repeating code with loops
Summary
8. Coding in Java Part 2 – Methods Chevron down icon Chevron up icon
8. Coding in Java Part 2 – Methods
Methods revisited
Scope and variables revisited
FAQ
Further reading
Summary
9. Object-Oriented Programming Chevron down icon Chevron up icon
9. Object-Oriented Programming
Important memory management warning
Introducing OOP
Taking a look at the code for a class
The basic classes mini app
Remember that encapsulation thing?
Encapsulation and static methods mini app
OOP and inheritance
The inheritance mini app
Polymorphism
FAQ
Summary
10. Everything's a Class Chevron down icon Chevron up icon
10. Everything's a Class
All Android UI elements are classes too
FAQ
Summary
11. Widget Mania Chevron down icon Chevron up icon
11. Widget Mania
Exploring Android UI objects
Exploring the palette
Android permissions and Marshmallows
The Widget exploration mini app
Summary
12. Having a Dialogue with the User Chevron down icon Chevron up icon
12. Having a Dialogue with the User
Dialog windows
About the Note To Self app
Building the project and gathering resources
Coding the Note class
Implementing the dialog designs
Coding the dialog boxes
Summary
13. Handling and Displaying Arrays of Data Chevron down icon Chevron up icon
13. Handling and Displaying Arrays of Data
A random diversion
Handling large amount of data with arrays
A simple array example mini app
Getting dynamic with arrays
Entering the nth dimension with arrays
ArrayLists
Arrays and ArrayLists are polymorphic
ListView and BaseAdapter
FAQ
Summary
14. Handling and Displaying Notes in Note To Self Chevron down icon Chevron up icon
14. Handling and Displaying Notes in Note To Self
Note To Self continued
Improvements in Note To Self
FAQ
Summary
15. Android Intent and Persistence Chevron down icon Chevron up icon
15. Android Intent and Persistence
Good Intents
Adding a settings page to the Note To Self app
Persisting data with SharedPreferences
Making the Note To Self app's settings persist
More advanced persistence
Backing up user data in Note To Self
FAQ
Summary
16. UI Animations Chevron down icon Chevron up icon
16. UI Animations
Animations in Android
The Animations Demo app – introducing SeekBar
Adding animations to Note To Self
FAQ
Summary
17. Sound FX and Supporting Different Versions of Android Chevron down icon Chevron up icon
17. Sound FX and Supporting Different Versions of Android
Supporting multiple versions of Android
Introducing the Spinner widget
Sound FX touches to Note To Self
Deleting a note – introducing OnLongClick
FAQ
Summary
18. Design Patterns, Fragments, and the Real World Chevron down icon Chevron up icon
18. Design Patterns, Fragments, and the Real World
Introducing the model-view-controller pattern
The imperfections of Note To Self revisited
Android design guidelines
Real-world apps
The device detection mini app
Configuration qualifiers
Using configuration qualifiers – mini app
Fragments
Our first working Fragment mini app
Fragment reality check
FAQ
Summary
19. Using Multiple Fragments Chevron down icon Chevron up icon
19. Using Multiple Fragments
Using singletons for the model layer
Inter-Fragment communications – interfaces revisited
The dual-Fragment address book mini app
FAQ
Summary
20. Paging and Swiping Chevron down icon Chevron up icon
20. Paging and Swiping
Building an image gallery/slider app
Building a Fragment pager/slider app
Summary
21. Navigation Drawer and Where It's Snap Chevron down icon Chevron up icon
21. Navigation Drawer and Where It's Snap
Introducing the navigation drawer
The Where it's snap app
Summary
22. Capturing Images Chevron down icon Chevron up icon
22. Capturing Images
Capturing images using the camera
The capturing images mini app
Where it's snap – coding the capture Fragment
Summary
23. Using SQLite Databases in Our Apps Chevron down icon Chevron up icon
23. Using SQLite Databases in Our Apps
Database 101
The SQL syntax primer
The Android SQLite API
The database mini app
Summary
24. Adding a Database to Where It's Snap Chevron down icon Chevron up icon
24. Adding a Database to Where It's Snap
The Photo class
Handling the SQLite database
Saving a new photo from the capture fragment
Displaying a photo from the database
Coding the communications interface
Coding TitlesFragment
Coding TagsFragment
Coding the fragment communications in MainActivity
Running the app so far
Summary
25. Integrating Google Maps and GPS Locations Chevron down icon Chevron up icon
25. Integrating Google Maps and GPS Locations
Global Positioning System
Where in the world – the GPS mini app
The Google Maps mini app
Summary
26. Upgrading SQLite – Adding Locations and Maps Chevron down icon Chevron up icon
26. Upgrading SQLite – Adding Locations and Maps
Adding locations and maps to Where it's Snap
Updating ViewFragment
Adding location permissions
Testing the new map feature
Summary
27. Going Local – Hola! Chevron down icon Chevron up icon
27. Going Local – Hola!
The Localization mini app
Localizing the Where it's snap app
Summary
28. Threads, Touches, Drawing, and a Simple Game Chevron down icon Chevron up icon
28. Threads, Touches, Drawing, and a Simple Game
Threads
Problems with threads
Drawing with canvas and paint
Android Canvas demo app
Handling touches
A simple game engine
Building a simple game of Pong
Summary
29. Publishing Apps Chevron down icon Chevron up icon
29. Publishing Apps
Preparing to publish
Building the publishable APK file
Publishing the app
Marketing
More to see
Summary
30. Before You Go Chevron down icon Chevron up icon
30. Before You Go
What next
Goodbye and thank you
Index Chevron down icon Chevron up icon
Index

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  • Top Reviews
  • Most Recent
Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.1
(47 Ratings)
5 star 55.3%
4 star 23.4%
3 star 4.3%
2 star 12.8%
1 star 4.3%
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Fabrizio Sep 23, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Amazing book. You can learn easily from the exercises throughout the book. Totally recommended.
Amazon Verified review Amazon
Siri Jan 07, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Disclaimer: I received an early copy of this book.Coming from a DB background, I wanted to increase my knowledge base to JAVA and then to Android. With an aspiration to eventually move to mobile development, I stumbled upon John's book - Learning Java by Building Android Games. I simply fell in love with its simplicity and clarity for concepts. To take it up a notch, I spent my holidays delving into this new book - Android Programming for Beginners. If you are looking for good fundamentals on Android subject, I would highly recommend this book. It covers everything from - JAVA, Android Studio, life cyclies, intents and introduces all the key concepts to get you started in app development.
Amazon Verified review Amazon
naman May 20, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Bigineers guide...True
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Mihir Kulkarni Aug 08, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Good book for beginners but the instructions in the book do not comply with current android studio version.
Amazon Verified review Amazon
Nico Jan 14, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Disclaimer: I received an early review copy of this book from the publisher.I decided to explore the world of Android programming, and read lots of books on how to program, but this one is by far the best one I have read. I have not yet finished the book before writing this review but can tell you that it is clear concise and very user friendly. I can also say as the title suggests it is very easy for a beginner to pick this book up and follow the examples. This book clearly explains everything so that beginners don't get confused like many other books I have started to read. It covers everything from setting the software up that you need to program in Android (Android Development Environment) to the actual code and then explains the code in a very easy to understand way. I love the way that complex areas are introduced early on in the book but are then explored in more detail as you progress through the book in various other chapters by doing mini projects, makes this a more manageable way to digest and actually take in the information easier. If like me you are wanting to explore and learn a new skill then I would recommend you read this book.
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About the authors

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Profile icon John Horton
John Horton
John Horton is a programming and gaming enthusiast based in the UK. He has a passion for writing apps, games, books, and blog articles. He is the founder of Game Code School.
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Mayani
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FAQs

How do I buy and download an eBook? Chevron down icon Chevron up icon

Where there is an eBook version of a title available, you can buy it from the book details for that title. Add either the standalone eBook or the eBook and print book bundle to your shopping cart. Your eBook will show in your cart as a product on its own. After completing checkout and payment in the normal way, you will receive your receipt on the screen containing a link to a personalised PDF download file. This link will remain active for 30 days. You can download backup copies of the file by logging in to your account at any time.

If you already have Adobe reader installed, then clicking on the link will download and open the PDF file directly. If you don't, then save the PDF file on your machine and download the Reader to view it.

Please Note: Packt eBooks are non-returnable and non-refundable.

Packt eBook and Licensing When you buy an eBook from Packt Publishing, completing your purchase means you accept the terms of our licence agreement. Please read the full text of the agreement. In it we have tried to balance the need for the ebook to be usable for you the reader with our needs to protect the rights of us as Publishers and of our authors. In summary, the agreement says:

  • You may make copies of your eBook for your own use onto any machine
  • You may not pass copies of the eBook on to anyone else
How can I make a purchase on your website? Chevron down icon Chevron up icon

If you want to purchase a video course, eBook or Bundle (Print+eBook) please follow below steps:

  1. Register on our website using your email address and the password.
  2. Search for the title by name or ISBN using the search option.
  3. Select the title you want to purchase.
  4. Choose the format you wish to purchase the title in; if you order the Print Book, you get a free eBook copy of the same title. 
  5. Proceed with the checkout process (payment to be made using Credit Card, Debit Cart, or PayPal)
Where can I access support around an eBook? Chevron down icon Chevron up icon
  • If you experience a problem with using or installing Adobe Reader, the contact Adobe directly.
  • To view the errata for the book, see www.packtpub.com/support and view the pages for the title you have.
  • To view your account details or to download a new copy of the book go to www.packtpub.com/account
  • To contact us directly if a problem is not resolved, use www.packtpub.com/contact-us
What eBook formats do Packt support? Chevron down icon Chevron up icon

Our eBooks are currently available in a variety of formats such as PDF and ePubs. In the future, this may well change with trends and development in technology, but please note that our PDFs are not Adobe eBook Reader format, which has greater restrictions on security.

You will need to use Adobe Reader v9 or later in order to read Packt's PDF eBooks.

What are the benefits of eBooks? Chevron down icon Chevron up icon
  • You can get the information you need immediately
  • You can easily take them with you on a laptop
  • You can download them an unlimited number of times
  • You can print them out
  • They are copy-paste enabled
  • They are searchable
  • There is no password protection
  • They are lower price than print
  • They save resources and space
What is an eBook? Chevron down icon Chevron up icon

Packt eBooks are a complete electronic version of the print edition, available in PDF and ePub formats. Every piece of content down to the page numbering is the same. Because we save the costs of printing and shipping the book to you, we are able to offer eBooks at a lower cost than print editions.

When you have purchased an eBook, simply login to your account and click on the link in Your Download Area. We recommend you saving the file to your hard drive before opening it.

For optimal viewing of our eBooks, we recommend you download and install the free Adobe Reader version 9.