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Android Programming In Java:
Starting with an App
Third Edition
Mike James
I/O Press
I Programmer Library
Copyright © 2017 I/O Press
All rights reserved. This book or any portion thereof may not be reproduced
or used in any manner whatsoever without the express written permission of
the publisher except for the use of brief quotations in a book review.
The publisher recognizes and respects all marks used by companies and
manufacturers as a means to distinguish their products. All brand names and
product names mentioned in this book are trade marks or service marks of
their respective companies and our omission of trade marks is not an attempt
to infringe on the property of others.
In particular we acknowledge that Android is a trademark of Google.
2
Preface
3
This book is at an introductory level as far as Android development goes,
however it isn’t for the complete beginner. It is assumed that you can
program, but not necessarily in Java, which is arguably the most important of
all today’s programming languages and the original language of Android. Java
is a very standard object-oriented language and with the help of comments
that point out where it is significantly different you should find it easy to pick
up as you go along. Finally the development tool used is the latest version of
Android Studio because it doesn’t make sense not to use it or to use anything
else.
This edition has been updated to cover features introduced in Android
Studio 3. In particular, it includes the use of Java 8 and the lambda
expression which greatly simplifies event handling. As well as the latest
Android Studio it also covers ConstraintLaout 1.0.2 which includes Groups
and Barriers as well as a much improved editor.
Mike James
November 2017
4
Table of Contents
Chapter 1
Getting Started With Android Studio 11
The Language Choice........................................................................12
What You Need to Know..................................................................12
Making a Start...................................................................................12
Your First Program............................................................................14
First Look...........................................................................................18
The IDE..............................................................................................19
Basic Project Structure......................................................................19
Anatomy of an Activity.....................................................................20
Hello Layout Designer.......................................................................21
Inspecting the XML...........................................................................26
The Java.............................................................................................26
Getting Started with the Emulator ...................................................28
Summary...........................................................................................31
Chapter 2
Activity and User Interface 33
The MainActivity..............................................................................34
Inside the Activity.............................................................................35
View and ViewGroup........................................................................36
Creating Our First UI.........................................................................37
Properties...........................................................................................41
Events................................................................................................42
Connecting the Activity to the UI.....................................................44
Finding View Objects........................................................................48
Summary ..........................................................................................50
Chapter 3
Building a Simple UI 53
What's in the Palette..........................................................................54
The Button an Example....................................................................56
Positioning – the ConstraintLayout..................................................56
Sizing.................................................................................................64
The Component Tree........................................................................66
A Simple Button Example – Baseline Alignment............................66
Orientation and Resolution..............................................................68
A First App – Simple Calculator.......................................................73
Summary...........................................................................................81
5
Chapter 4
Android Events 83
The Lambda Approach.....................................................................83
Lambda Types...................................................................................85
Using a Lambda to Create an Event handler....................................86
Closure...............................................................................................88
Event Handler Using A Class............................................................89
Using Breakpoints.............................................................................92
Alternative Ways to Handle an Event..............................................93
Implement the Interface in the Activity...........................................94
Anonymous Classes..........................................................................95
Code Folding.....................................................................................98
Which Approach Should You Use?..................................................99
Summary.........................................................................................100
Chapter 5
Basic Controls 101
Basic Input Controls........................................................................101
Button Styles and Properties..........................................................101
All Properties...................................................................................105
Text Fields.......................................................................................107
The onEditorAction Event..............................................................110
CheckBoxes.....................................................................................111
Switches and Toggle buttons..........................................................112
Radio Buttons .................................................................................113
Summary.........................................................................................115
Chapter 6
Working With Layouts 117
Understanding Layouts...................................................................117
Layout Properties............................................................................118
Width and Height............................................................................120
Units................................................................................................120
A Control is Just a Box....................................................................122
Gravity.............................................................................................123
The FrameLayout............................................................................124
LinearLayout....................................................................................126
RelativeLayout.................................................................................130
Summary.........................................................................................134
6
Chapter 7
The ConstraintLayout 135
Automatic Constraints....................................................................136
Manual Constraints.........................................................................140
Bias Constraints...............................................................................143
Chains..............................................................................................145
A Chained Keypad..........................................................................147
Guidelines........................................................................................150
Groups.............................................................................................151
Sizing...............................................................................................152
Barriers............................................................................................157
Constraint Properties......................................................................160
Troubleshooting..............................................................................160
Summary.........................................................................................162
Chapter 8
Programming The UI 163
A UI Library.....................................................................................163
The View.........................................................................................163
Using setContentView.....................................................................164
The ViewGroup...............................................................................166
Programming Layout Properties.....................................................167
The View Hierarchy........................................................................169
XML Layout.....................................................................................169
Inflation Theory..............................................................................170
Finding View objects.......................................................................171
How to Build a UI?..........................................................................172
Summary.........................................................................................173
Chapter 9
Menus – Toolbar 175
Creating a Menu Resource..............................................................175
The Menu Tree................................................................................176
Displaying a Menu..........................................................................178
Using the Toolbar............................................................................179
Creating the App Bar ......................................................................183
Where's My Toolbar?.......................................................................184
Responding to Menu Events...........................................................184
Changing Menus in Code................................................................187
Controlling the Toolbar...................................................................190
Summary.........................................................................................191
7
Chapter 10
Menus – Context & Popup 193
The Context Menu..........................................................................193
Contextual Action Bar.....................................................................196
The Popup Menu.............................................................................200
Summary.........................................................................................203
Chapter 11
Resources 205
Why Use Resources?.......................................................................205
What are Resources?.......................................................................207
Drawables........................................................................................208
Values..............................................................................................211
IDs....................................................................................................212
Accessing Resources in Code – The R Object................................213
Conditional Resources....................................................................214
A Simple Localization.....................................................................218
Android Studio Translation Tools.................................................219
Summary.........................................................................................221
Chapter 12
Bitmap Graphics 223
Android Graphics............................................................................223
The Bitmap......................................................................................223
The ImageView Control..................................................................224
Canvas..............................................................................................225
A First Graphic................................................................................226
Transformations..............................................................................229
A Logical Approach to Transforms................................................232
Setting Your Own Coordinates.......................................................233
Simple Animation...........................................................................234
Timer and Threads..........................................................................236
Listing..............................................................................................241
Summary.........................................................................................243
8
Chapter 13
Life Cycle Of An Activity
Lifetime and State...........................................................................245
The Life Cycle of an App................................................................246
The Simple Approach.....................................................................247
Lifecycle Explorer...........................................................................248
Trying It Out....................................................................................249
Retaining State – the Bundle..........................................................250
Saving Additional UI Data..............................................................252
Complex UI Elements.....................................................................253
Advanced State Management.........................................................254
Summary.........................................................................................255
Chapter 14
Spinners 257
The Spinner and the Designer........................................................257
Introducing the ArrayAdapter........................................................259
Handling the Selection...................................................................261
Creating an ArrayAdapter from a Resource...................................265
Changing The List...........................................................................265
Summary.........................................................................................267
Chapter 15
Pickers 269
Working with Pickers......................................................................269
TimePicker.......................................................................................270
TimePicker in Code.........................................................................271
Updating the Time..........................................................................272
DatePicker........................................................................................273
Number Picker.................................................................................277
Multi-Digit Input.............................................................................281
Summary.........................................................................................285
Chapter 16
ListView 287
Understanding the Adapter............................................................287
Extending the ListAdapter Class....................................................288
Using the ArrayAdapter..................................................................289
Working with the Data....................................................................291
A Custom Layout.............................................................................294
A Custom ArrayAdapter.................................................................297
Reuse, Caching and General Layouts.............................................301
Custom Adapter..............................................................................304
Summary.........................................................................................306
9
Chapter 1
Android represents a big potential market. It is also the most open of the "big"
phone and tablet platforms. You can write a program for an Android and let
your friends have a copy, keep it to yourself or put it on sale in an app store.
Android phones and tablets are comparatively cheap and this makes it easier
to get started. What is even better, all the tools you need to create an Android
app are free. You don't need to pay anything to create, or distribute, your
Android apps. If you want to sell them using a well known marketplace there
may something to pay – there is a one-time fee of $25 to register for Google
Play, but you don't have to use any particular distribution method.
All that stands between you and your Android app is your imagination and
programming ability. I can't do much to improve your imagination, but I can
help with the programming side of things. If you are new to Android
programming this is the place to start.
In this book I will show you the fundamentals of Android programming. Not
the tips and tricks, but how to think about what is going on. You'll be
introduced to the general principles that will make it possible for you to
master anything that you encounter that is new in the future. It isn’t possible
to cover all of Android in one book as the subject is very large. Instead we
focus on the basics of creating a User Interface (UI) as all apps have to have
some way of interacting with a user.
There are many ways to create an Android app but Google's Android Studio is
an easy to use Android IDE – Integrated Development Environment – and it is
now the recommended way of doing the job.
Before Android Studio you had to use the Eclipse IDE and set up the SDK and
other pieces of software needed. This wasn't difficult, but Android Studio
eliminates extra steps and it makes programming Android easy. Put simply, it
is the way of the future and so worth your investment in learning it.
With the release of Android Studio Google stopped work on the Eclipse
plugin and this means that Android Studio really is the only way to develop
apps from now on.
You can get started in a few minutes and by the end of this chapter, have your
first working Android application.
11
The Language Choice
With the release of Android Studio 3 you now have a choice of programming
in Java or Kotlin. The advantage of Java is that it is a well known and well
supported language. In Android Studio 3 you can also program using features
from Java 8 including lambda functions. This greatly simplifies tasks such as
event handling and, while we will examine how to do event handling in Java
without lambda functions, using them is going to be the norm.
As the entire Android library is written in Java you really can’t avoid it. The
alternative language Kotlin is very easy to use and backwards compatible
with Java. There is very little risk in using it, but it is also helpful to know
enough Java to work with existing code.
The bottom line is that while Kotlin is an easier language to use, there are
advantages in knowing and using Java.
Making a Start
I'm not going to spend a lot of time explaining how to install Android Studio
in a step-by-step way as the Android website does a good job and it is more
likely to be up-to-date. It is worth, however, going over the basic principles.
Download the Android Studio package from Android Studio Home page:
https://developer.android.com/studio/
Install Android Studio which also installs all of the Android SDK and tools
you will need.
12
Windows:
1. Launch the downloaded EXE file,
android-studio-bundle-<version>.exe.
2. Follow the setup wizard to install Android Studio.
Mac OS X:
1. Open the downloaded DMG file,
android-studio-bundle-<version>.dmg
2. Drag and drop Android Studio into the Applications folder.
Linux:
1. Unpack the downloaded ZIP file,
android-studio-bundle-<version>.tgz,
into an appropriate location for your applications.
2. To launch Android Studio, navigate to the
android-studio/bin/
directory in a terminal and execute studio.sh. You may want to add
android-studio/bin/
to your PATH environmental variable so that you can start Android
Studio from any directory.
Accept any defaults that the setup program offers you – unless you have a
good reason not to. It installs not only Android Studio, but the SDK and the
13
virtual device system that lets you test your application. In most cases
Android Studio just installs with no problem.
Now you should be able to run Android Studio. If not the most likely cause of
the problem is the JDK and so re-installation is a best first option.
If you have already created some programs you might well see them listed in
Recent projects.
14
Assuming this is your first project select the option:
Start a new Android Studio project
You can ignore the details of the new project for the moment. All you have to
do is supply a name for your application - HelloWorld in this case. Make sure
you uncheck the Include Kotlin support option as you want to make use of
Java. Accept the other defaults that Android Studio has filled in for you.
When you click Next you are given the chance to pick what devices you are
targeting. Again simply accept the defaults:
15
Most of the time you will want to create apps that run on a version of Android
that captures the biggest market, but if this isn't a concern then it can be
better to select a more recent Android version.
The next page lets you select a template for your project. In this case change
the selection to Basic Activity. This gives you some additional generated code
which makes it easier to create an app that looks right. Every Android
application consists of at least one Activity and this template generates a
project with a single Activity ready for you to customize:
On the next page you can assign custom names for the various components of
your project that the template generates. For a real project you would assign
names that were meaningful, but in this case you can accept the defaults:
16
Finally you can click the Finish button and wait as Android Studio creates all
the files you need. Even a simple Android project has lots of files so again it
all takes time.
17
First Look
When everything is ready you will see Android Studio for the first time.
As long as everything has worked you should eventually, it takes about three
minutes or more, be presented with a view of your new project starting off in
the Designer. Click the Design tab to see the initial user interface:
Problems?
If you get any error messages then the chances are that your project hasn't
finished being processed. Wait a little while longer for the activity to stop. If
you look at the status line at the bottom of the window you will see a message
saying “Gradle Build Finished” when Android Studio has finished with your
new project.
If you still have problems it is worth trying the File,Invalidate Caches/Restart
command. This usually works for "Missing styles" and similar errors.
18
The IDE
Although there looks like a lot to master in the Android Studio user interface,
most of it you will only visit occasionally. The key things to notice are that
moving from left to right you have:
● The Project window
● The tool Palette and the Component Tree window
● The Designer or Layout Editor
● The Attributes window
Most of the time you will be using the Project window and the Attributes
window. You will also see different editors depending on what sort of file
you have selected. In this case you have by default a layout file,
content_main.xml, selected and hence you have a layout editor in the middle
of the screen.
Before we go into layout, which is one of the main topics of this book, it is
important that you know a little about the file structure of a project so that
you can navigate to its different parts.
It seems almost unbelievable that the simplest Android app you can create
involves so many files.
19
Don't panic. Most of the files that have been created are auto-generated and
most of the time you don't need to know anything about them, let alone open
or edit them. In fact, opening and editing auto-generated files really isn't a
good idea.
So let's focus on the files that matter to us.
For our simple program there are only two important files. One of them
determines the behavior of the Activity:
MainActivity.java
The other determines the visual appearance, or View, of the app:
content_main.xml
You can set which Activity is the one that the system starts, but by default it
is the single activity that you created and named when you set up the project.
You can change the default names but for the moment leave them as they are.
The java directory is, from your point of view, where most of the construction
of your app occurs so make sure you know where it is. The res directory is
where you store all of the resources, layouts, bitmaps, etc, that your app
needs.
So while things look complicated at the moment the only two project files
that matter to you, and your project, are MainActivity.java in the java folder
and content_main.xml in the res folder.
The two other folders in the java folder are concerned with creating tests for
your program. This is not something that we need to worry about when first
starting to write Android apps.
Anatomy of an Activity
An Android app is made up of one or more Activity classes.
You can think of an Activity as being something like a web page complete
with HTML to determine what displays and JavaScript to determine what it
does.
In the case of an Activity the layout is determined by the XML file in resource
(res) folder, this is often called the View, and the behavior is determined by
the code in the java folder.
The XML can be thought of as a markup language much like HTML or XAML.
It defines an initial layout for the screen when the app first runs. It is possible
to generate new layout components at runtime from the Java file. In fact, if
you really want to, you can dispense with the XML file and generate
everything from code, but as you will discover the XML markup approach is
much the best way to do the job because of the availability of the Designer.
20
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