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

Android Programming with Kotlin for Beginners: Build Android apps starting from zero programming experience with the new Kotlin programming language

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Android Programming with Kotlin for Beginners

Chapter 2. Kotlin, XML, and the UI Designer

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

  • See how to get technical feedback from our apps.
  • Examine the Kotlin code and User Interface (UI) XML code from our first app.
  • Get our first taste of using the Android UI designer.
  • Write our first Kotlin code.
  • Learn some core Kotlin fundamentals and how they relate to Android.

First, let's see how to get feedback from our apps.

Examining the log output

In the previous chapter, we mentioned that our app was running in debug mode on the emulator or real device; this is so that we can monitor it and get feedback when things go wrong. So, where is all this feedback?

You might have noticed a lot of scrolling text at the bottom of the Android Studio window. If not, click on the logcat tab, as shown by the highlighted area labeled as 1 in the following screenshot:

Tip

Note that the emulator must be running, or a real device must be attached in debugging mode, for you to see the following window. Furthermore, if you restarted Android Studio for some reason and have not yet executed the app, then the logcat window will be empty. Refer to the first chapter to get the app running on an emulator or a real device:

Examining the log output

You can drag the window to make it taller, just as you can in most other Windows applications, if you want to see more.

This window is called logcat, or, sometimes, it is referred to as console. It is our app's...

Exploring the project's Kotlin code and the main layout's XML code

We are going to look at the resource files containing the code that defines our simple UI layout and the file that has our Kotlin code. At this stage, we won't try to understand it all, as we need to learn some more basics before it makes sense to do so. What we will see, however, is the basic content and structure of both files, so we can reconcile their content with what we already know about Android resources and Kotlin.

Examining the MainActivity.kt file

Let's take a look at the Kotlin code first. You can see this code by left-clicking on the MainActivity.kt tab, as shown in the following screenshot:

Examining the MainActivity.kt file

As we are not looking at the intricate details of the code, an annotated screenshot is more useful than reproducing the actual code in text form. Regularly refer to the following screenshot while reading this section:

Examining the MainActivity.kt file

The first thing to note is that I have added a few empty lines in among the code to space...

Adding buttons to the main layout file

Here, we will add a couple of buttons to the screen and will then explore a quick way to make them do something. We will add a button in two different ways; first, using the visual designer, and second, by adding to and editing the XML code directly.

Adding a button via the visual designer

To get started adding our first button, switch back to the design view by clicking on the Design tab underneath the XML code that we have just been discussing. The button is highlighted in the following screenshot:

Adding a button via the visual designer

Notice that in the left-hand side of the layout, we have a window that is called Palette:

Adding a button via the visual designer

The palette window is divided into two parts. The left-hand list has the categories of the UI elements and allows you to select a category, while the right-hand side shows you all the available UI elements from the currently selected category.

Make sure that the Common category is selected, as shown in the previous screenshot. Now, left-click and hold on the Button widget...

Leaving comments in our Kotlin code

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

// This is a comment and it could be useful

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

// The code below used to send a message
// Log.i("info","our message here")
// But now it doesn't do anything
// And I am getting ahead of where I should be

Tip

Using comments to comment out code should only be a temporary measure. Once you have found the correct code to use, commented-out code should be cut to keep the code file clean and organized.

Let's take a look at two separate ways to send messages...

Coding messages to the user and the developer

In the introduction to this chapter and in the previous chapter, we talked a bit about using other people's code, specifically via the classes and their functions of the Android API. We saw that we could do some quite complex things with fairly insignificant amounts of code (such as talking to satellites).

To get us started on coding, we are going to use two different classes from the Android API that allow us to output messages. The first class, Log, allows us to output messages to the logcat window. The second class, Toast, is not a tasty breakfast treat, but it will produce a toast-shaped pop up message for our app's user to see.

Here is the code we need to write to send a message to logcat:

Log.i("info","our message here")

Exactly why this works will become clearer in Chapter 10, Object-Oriented Programming, but for now, we just need to know that whatever we put between the two sets of quote marks will be output...

Writing our first Kotlin code

So, we now know the code that will output to logcat or the user's screen. However, where do we put the code? To answer this question, we need to understand that the onCreate function in MainActivity.kt executes as the app is preparing to be shown to the user. So, if we put our code at the end of this function, it will run just as the user sees it; that sounds good.

Tip

We know that to execute the code in a function, we need to call it. We have wired our buttons up to call a couple of functions, such as topClick and bottomClick. Soon, we will write these functions. But who or what is calling onCreate? The answer to this mystery is that Android itself calls onCreate in response to the user clicking on the app icon to run the app. In Chapter 6, The Android Lifecycle, we will look deeper, and it will be clear what exactly the code executes and when. You don't need to completely comprehend this now; I just wanted to give you an overview of what was going...

Frequently asked questions

Q.1) Can you remind me what functions are?

A) Functions are containers for our code that can be executed (called) from other parts of our code.

Q.2) Like the first, I found this chapter tough going. Do I need to re-read it?

A) No, if you managed to build the app, you have made enough progress to handle all of 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.

Examining the log output

In the previous chapter, we mentioned that our app was running in debug mode on the emulator or real device; this is so that we can monitor it and get feedback when things go wrong. So, where is all this feedback?

You might have noticed a lot of scrolling text at the bottom of the Android Studio window. If not, click on the logcat tab, as shown by the highlighted area labeled as 1 in the following screenshot:

Note

Note that the emulator must be running, or a real device must be attached in debugging mode, for you to see the following window. Furthermore, if you restarted Android Studio for some reason and have not yet executed the app, then the logcat window will be empty. Refer to the first chapter to get the app running on an emulator or a real device:

You can drag the window to make it taller, just as you can in most other Windows applications, if you want to see more.

This window is called logcat, or, sometimes, it is referred to as console. It is our app's way of...

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Key benefits

  • Start your Android programming career, or just have fun publishing apps on Google Play marketplace
  • The first-principle introduction to Kotlin through Android, to start building easy-to-use apps
  • Learn by example and build four real-world apps and dozens of mini-apps

Description

Android is the most popular mobile operating system in the world and Kotlin has been declared by Google as a first-class programming language to build Android apps. With the imminent arrival of the most anticipated Android update, Android 10 (Q), this book gets you started building apps compatible with the latest version of Android. It adopts a project-style approach, where we focus on teaching the fundamentals of Android app development and the essentials of Kotlin by building three real-world apps and more than a dozen mini-apps. The book begins by giving you a strong grasp of how Kotlin and Android work together before gradually moving onto exploring the various Android APIs for building stunning apps for Android with ease. You will learn to make your apps more presentable using different layouts. You will dive deep into Kotlin programming concepts such as variables, functions, data structures, Object-Oriented code, and how to connect your Kotlin code to the UI. You will learn to add multilingual text so that your app is accessible to millions of more potential users. You will learn how animation, graphics, and sound effects work and are implemented in your Android app. By the end of the book, you will have sound knowledge about significant Kotlin programming concepts and start building your own fully featured Android apps.

Who is this book for?

This book is for people who are new to Kotlin, Android and want to develop Android apps.It also acts as a refresher for those who have some experience in programming with Android and Kotlin.

What you will learn

  • Learn how Kotlin and Android work together
  • Build a graphical drawing app using Object-Oriented Programming (OOP) principles
  • Build beautiful, practical layouts using ScrollView, RecyclerView, NavigationView, ViewPager and CardView
  • Write Kotlin code to manage an apps data using different strategies including JSON and the built-in Android SQLite database
  • Add user interaction, data captures, sound, and animation to your apps
  • Implement dialog boxes to capture input from the user
  • Build a simple database app that sorts and stores the user s data

Product Details

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Publication date : Apr 30, 2019
Length: 698 pages
Edition : 1st
Language : English
ISBN-13 : 9781789800883
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Category :
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Languages :
Kotlin
Concepts :
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Publication date : Apr 30, 2019
Length: 698 pages
Edition : 1st
Language : English
ISBN-13 : 9781789800883
Vendor :
Google
Category :
Mobile
Languages :
Kotlin
Concepts :
Android Development
Tools :
Android

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Table of Contents

30 Chapters
1. Getting Started with Android and Kotlin Chevron down icon Chevron up icon
1. Getting Started with Android and Kotlin
Why use Kotlin and Android?
The beginner's first stumbling block
How Kotlin and Android work together
Setting up Android Studio
What makes an Android app?
The structure of Android's code
Our first Android app
Deploying the app so far
Frequently asked question
Summary
2. Kotlin, XML, and the UI Designer Chevron down icon Chevron up icon
2. Kotlin, XML, and the UI Designer
Examining the log output
Exploring the project's Kotlin code and the main layout's XML code
Adding buttons to the main layout file
Leaving comments in our Kotlin code
Coding messages to the user and the developer
Writing our first Kotlin code
Frequently asked questions
Summary
3. Exploring Android Studio and the Project Structure Chevron down icon Chevron up icon
3. Exploring Android Studio and the Project Structure
A quick guided tour of Android Studio
Project Explorer and project anatomy
The Basic Activity project
Exploring the Android emulator
Summary
4. Getting Started with Layouts and Material Design Chevron down icon Chevron up icon
4. Getting Started with Layouts and Material Design
Material design
Exploring Android UI design
Layouts
Creating the Exploring Layouts project
Building a menu with LinearLayout
Wiring up the UI with the Kotlin code (part 1)
Adding layouts within layouts
Making the layout look pretty
Wiring up the UI with the Kotlin code (part 2)
Building a precise UI with ConstraintLayout
Laying out data with TableLayout
Summary
5. Beautiful Layouts with CardView and ScrollView Chevron down icon Chevron up icon
5. Beautiful Layouts with CardView and ScrollView
Attributes – a quick summary
Building a UI with CardView and ScrollView
Themes and material design
Creating a tablet emulator
Frequently asked question
Summary
6. The Android Lifecycle Chevron down icon Chevron up icon
6. The Android Lifecycle
The life and times of an Android app
A simplified explanation of the Android lifecycle
How we handle the lifecycle phases
The lifecycle demo app
Some other overridden functions
The structure of Kotlin code – revisited
Summary
7. Kotlin Variables, Operators, and Expressions Chevron down icon Chevron up icon
7. Kotlin Variables, Operators, and Expressions
Learning the jargon
More on code comments
Variables
Operators and expressions
The express yourself demo app
Summary
8. Kotlin Decisions and Loops Chevron down icon Chevron up icon
8. Kotlin Decisions and Loops
Making decisions in Kotlin
Repeating code with loops
while loops
do-while loops
Ranges
For loops
Controlling loops with break and continue
Sample code
Summary
9. Kotlin Functions Chevron down icon Chevron up icon
9. Kotlin Functions
Function basics and recap
Making functions flexible
Summary
10. Object-Oriented Programming Chevron down icon Chevron up icon
10. Object-Oriented Programming
Introducing OOP
Basic classes
Visibility modifiers
Constructors
Basic classes app and using the init block
Introduction to references
Summary
11. Inheritance in Kotlin Chevron down icon Chevron up icon
11. Inheritance in Kotlin
OOP and inheritance
Using inheritance with open classes
More polymorphism
Classes using the Inheritance example app
Summary
12. Connecting Our Kotlin to the UI and Nullability Chevron down icon Chevron up icon
12. Connecting Our Kotlin to the UI and Nullability
All the Android UI elements are classes too
Kotlin interfaces
Using buttons and TextView widgets from our layout with a little help from interfaces
Nullability – val and var revisited
Summary
13. Bringing Android Widgets to Life Chevron down icon Chevron up icon
13. Bringing Android Widgets to Life
Declaring and initializing the objects from the layout
Creating UI widgets from pure Kotlin without XML
Exploring the palette – part 1
Lambdas
Exploring the palette – part 2, and more lambdas
The widget exploration app
Coding the widget exploration app
Running the Widget Exploration app
Converting layouts to ConstraintLayout
Summary
14. Android Dialog Windows Chevron down icon Chevron up icon
14. Android Dialog Windows
Dialog windows
The Note to self app
Summary
15. Handling Data and Generating Random Numbers Chevron down icon Chevron up icon
15. Handling Data and Generating Random Numbers
A random diversion
Handling large amounts of data with arrays
A simple mini-app array example
Getting dynamic with arrays
ArrayLists
Arrays and ArrayLists are polymorphic
Hashmaps
The Note to self app
Frequently asked questions
Summary
16. Adapters and Recyclers Chevron down icon Chevron up icon
16. Adapters and Recyclers
Inner classes
RecyclerView and RecyclerAdapter
Adding RecyclerView, RecyclerAdapter, and ArrayList to the Note to Self project
Running the app
Frequently asked questions
Summary
17. Data Persistence and Sharing Chevron down icon Chevron up icon
17. Data Persistence and Sharing
The Android Intent class
Adding a settings page to Note to self
Persisting data with SharedPreferences
Reloading data with SharedPreferences
Making the Note to self settings persist
More advanced persistence
Backing up user data in Note to self
Frequently asked questions
Summary
18. Localization Chevron down icon Chevron up icon
18. Localization
Making the Note to self app Spanish, English, and German
Running Note to self in German or Spanish
Summary
19. Animations and Interpolations Chevron down icon Chevron up icon
19. Animations and Interpolations
Animations in Android
Animations demo app – introducing SeekBar
Frequently asked questions
Summary
20. Drawing Graphics Chevron down icon Chevron up icon
20. Drawing Graphics
Understanding the Canvas class
Using the Canvas class
The Canvas Demo app
The Android coordinate system
Creating bitmap graphics with the Bitmap class
Manipulating bitmaps
The Bitmap manipulation demo app
Frequently asked question
Summary
21. Threads and Starting the Live Drawing App Chevron down icon Chevron up icon
21. Threads and Starting the Live Drawing App
Creating the Live Drawing project
Looking ahead at the Live Drawing app
Coding the MainActivity class
Coding the LiveDrawingView class
The game loop
Threads
Implementing the game loop with a thread
Running the app
Summary
22. Particle Systems and Handling Screen Touches Chevron down icon Chevron up icon
22. Particle Systems and Handling Screen Touches
Adding custom buttons to the screen
Implementing a particle system effect
Handling touches
Running the app
Summary
23. Android Sound Effects and the Spinner Widget Chevron down icon Chevron up icon
23. Android Sound Effects and the Spinner Widget
The SoundPool class
Sound demo app introducing the Spinner widget
Summary
24. Design Patterns, Multiple Layouts, and Fragments Chevron down icon Chevron up icon
24. Design Patterns, Multiple Layouts, and Fragments
Introducing the model-view-controller pattern
Android design guidelines
Real-world apps
Device detection mini app
Configuration qualifiers
Fragments
Our first fragment app
Fragment reality check
Frequently asked question
Summary
25. Advanced UI with Paging and Swiping Chevron down icon Chevron up icon
25. Advanced UI with Paging and Swiping
The Angry Birds classic swipe menu
Building an image gallery/slider app
Kotlin companion objects
Building a Fragment Pager/slider app
Summary
26. Advanced UI with Navigation Drawer and Fragment Chevron down icon Chevron up icon
26. Advanced UI with Navigation Drawer and Fragment
Introducing the NavigationView
Examining the Age Database app
Starting the Age Database project
Exploring the auto-generated code and assets
Coding the Fragment classes and their layouts
Using the Fragment classes and their layouts
Summary
27. Android Databases Chevron down icon Chevron up icon
27. Android Databases
Database 101
The SQL syntax primer
The Android SQLite API
Coding the database class
Coding the Fragment classes to use the DataManager class
Running the Age Database app
Summary
28. A Quick Chat Before You Go Chevron down icon Chevron up icon
28. A Quick Chat Before You Go
Publishing
Making an app!
Carrying on learning
My other channels
Goodbye and thank you
A. Other Book You May Enjoy Chevron down icon Chevron up icon
A. Other Book You May Enjoy
Leave a review - let other readers know what you think
Index Chevron down icon Chevron up icon
Index

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very good book, i'm on chapter 4 now, keeps you motivating to go step by step
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Nicely laid out and very informative. Easy to read and understand.
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Hurricane Lake Jun 10, 2020
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This book is Great!. I am joyfully engaged in it. Your detailed explanations of the workings of Android Studio and how Android Studio works with Kotlin, i.e., how the UI and functions work, and what goes where and why is greatly appreciated. Thanks for taking the time to go that deep. Your book was such an education about the underlying workings of Android Studio and the workings of Android Studio using Kotlin that I am able to tweak all examples to work on the later Android Studio version - Android Studio 4. Thanks again.
Amazon Verified review Amazon
Michael O. Jul 12, 2019
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This should be the first book for fledgling developers of Android apps using Kotlin. I have read other books and had limited success in understanding key concepts. I liked Mr. Horton's conversational style and attention to detail. He purposefully doesn't burden the reader with more Kotlin language idioms than are needed for each current project. He explains concepts very well. He understands his core audience and gently addresses the limitations of beginning coders.
Amazon Verified review Amazon
GOBINDA R. Mar 18, 2021
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I brought this book as kindle addition. The book writer language is very easy to understand. And the content of the book is very helpful for me, as I just started to learn the code. This book is very useful also for beginners. It covers every topic in details. So, if you are searching for a cotlin programming book, then you must give this book a try, trust me.
Amazon Verified review Amazon

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About the author

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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