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Android Development with Kotlin
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Android Programming with Kotlin for Beginners
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How can I learn Kotlin for free?
Kotlin is easy to learn, especially if you already know Java (it is 100% compatible with Java). Kotlin is used to develop Android apps, server side apps, and much more.Is Android Kotlin easy to learn?
Python is a dynamic programming language, whereas Kotlin is a statical language. Python is less difficult to master and comprehend than Kotlin.Is Kotlin easier than Python?
In this free course—developed by experts at Google—you will learn the fundamentals of building Android applications using Kotlin. The course covers architecture components, multi-screen navigation, data persistence, RESTful APIs, and Material Design.
Android Programming with
Kotlin for Beginners
Build Android apps starting from zero programming
experience with the new Kotlin programming languageJohn Horton
BIRMINGHAM - MUMBAI
Android Programming with Kotlin for Beginners
Copyright © 2019 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permi ssion of the publisher, except in the case of brief quotations embedded in critical articles or reviews. Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book i s sold without warranty, either express or implied. Neither the author, nor Packt Publishing or i ts dealers and distributors, will be held liable for any damages caused or alleged to have been cause d directly or indirectly by this book. Packt Publishing has endeavored to provide trademark information about a ll of the companies and products mentioned in this book by the appropriate use of capitals. Howe ver, Packt Publishing cannot guarantee the accuracy of this information.Commissioning Editor:
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Did you know that Packt offers eBook versions of every book published, w ith PDF www.Packt.com and as a print book customer, you are entitled to a discount on the eBoo k copy. Get in touch with us at customercare@packtpub.com for more details. At www.Packt.com, you can also read a collection of free technical articles, sign up for a range of free newsletters, and receive exclusive discounts and off ers on Packt books and eBooks.Contributors
About the author
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 fou nder of GameCode School.
About the reviewers
Ashok Kumar S has been working in the mobile development domain for about six years. In his early days, he was a JavaScript and Node develop er. With his strong web development skills, he mastered web and mobile development. H e is a developers. He also contributes heavily to open source to improve his e- karma. He has written books on WearOS programming and the Firebase toolchain. Ashok has also reviewed books on mobile and web development, namelyMastering Junit5
Android Programming for Beginners
, andDeveloping Enterprise
Applications Using JavaScript
Mitchell Wong Ho was born in Johannesburg, South Africa, where he completed his national diploma in electrical engineering. Mitchell's software deve lopment career started on embedded systems and then moved to Microsoft desktop/s erver applications. Mitchell has been programming in Java since 2000 on J2ME, JEE, desktop, and Android applications, and has more recently been advocating Kotlin for A ndroid.Packt is searching for authors like you
If you're interested in becoming an author for Packt, please visit authors.packtpub. com and apply today. We have worked with thousands of developers and tech professionals, just like you, to help them share their insight with the global tech we are recruiting an author for, or submit your own idea. [ i ]Table of Contents
Preface
xvChapter 1:
Getting Started with Android and Kotlin
1Why use Kotlin and Android?
2The Android API
5Kotlin is object-oriented
6Run that by me again - what, exactly, is Android?
7Android Studio
8Setting up Android Studio
9Final step - for now
16What makes an Android app?
17Android resources
17The structure of Android's code
18Packages
18Classes
19Functions
19Possible extra step 1
24Possible extra step 2
25Deploying the app so far
25Running and debugging the app on an Android emulator 26
Running the app on a real device
29Table of Contents
[ ii ]Chapter 2:
Filtering the logcat output
35Code folding (hiding) in Android Studio
36The package declaration
37Importing classes
37The class declaration
38Functions inside the class
38A summary of the Kotlin code so far
39UI layout elements
41UI text elements
42Adding a button via the visual designer
43Editing the button's attributes
45Examining the XML code for the new button
48Adding a button by editing the XML code
49Giving the buttons unique id attributes
51Positioning the two buttons in the layout
52Leaving comments in our Kotlin code
56Coding messages to the user and the developer
57Adding message code to the onCreate function
58Examining the output
59Writing our own Kotlin functions
60Examining the output
62Exploring Android Studio and the Project Structure 65
A quick guided tour of Android Studio
66Project Explorer and project anatomy
68The Empty Activity project
68Exploring the Empty Activity project
70The manifests folder
71The java folder
74The res folder
76The res/drawable folder
76The res/layout folder
77The res/mipmap folder
78The res/values folder
79Table of Contents
[ iii ]Exploring the Basic Activity project
85The extra functions in MainActivity.kt
88Exploring the Android emulator
89The emulator control panel
90Using the emulator as a real device
92Accessing the app drawer
93Viewing active apps and switching between apps
94Summary
95Getting Started with Layouts and Material Design
97Material design
98Exploring Android UI design
98Layouts
99Creating the Exploring Layouts project
99Adding a LinearLayout to the project
101Preparing your workspace
102Examining the generated XML 103
Adding a TextView to the UI
103Adding a multi-line TextView to the UI
106Wiring up the UI with the Kotlin code (part 2)
116Building a precise UI with ConstraintLayout
116Adding a CalenderView
116Resizing a view in a ConstraintLayout
117Using the Component Tree window
118Adding constraints manually
120Adding and constraining more UI elements
121Making the text clickable
125Laying out data with TableLayout
126Adding a TableRow to TableLayout
126Using the Component Tree when the visual designer won't do 127
Organizing the table columns
128Linking back to the main menu
130Table of Contents
[ iv ]Chapter 5:
Sizing using dp
134Sizing fonts using sp
134Determining size with wrap or match
135Using padding and margin
137Using the layout_weight property
138Using gravity
139Setting the view with Kotlin code
142Adding image resources
142Creating the content for the cards
143Adding CardView to our layout
147Themes and material design
152Using the Android Studio theme designer
153Creating a tablet emulator
156Frequently asked question
159Summary
159Chapter 6:
The Android Lifecycle
161The life and times of an Android app
162How Android interacts with our apps
162How we handle the lifecycle phases
165The lifecycle demo app
168Coding the lifecycle demo app
168Running the lifecycle demo app
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