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Android Studio 3.2

Development Essentials

Kotlin Edition

Android Studio 3.2 Development Essentials - Kotlin Edition

ISBN-13: 978-0960010929

?is book is provided for personal use only. Unauthorized use, reproduction and/or distribution strictly

?e content of this book is provided for informational purposes only. Neither the publisher nor the author o?ers

any warranties or representation, express or implied, with regard to the accuracy of information contained in

this book, nor do they accept any liability for any loss or damage arising from any errors or omissions.

?is book contains trademarked terms that are used solely for editorial purposes and to the bene?t of the

respective trademark owner. ?e terms used within this book are not intended as infringement of any trademarks.

Rev: 1.0

1. Introduction ........................................................................

1.1 Downloading the Code Samples ........................................................................

...............................1

1.2 Feedback ........................................................................

1.3 Errata........................................................................

.....2

2. Setting up an Android Studio Development Environment .......................................................................3

2.1 System Requirements ........................................................................

2.2 Downloading the Android Studio Package ........................................................................

.............3

2.3 Installing Android Studio ........................................................................

2.3.1 Installation on Windows ........................................................................

.....................................4

2.3.2 Installation on macOS ........................................................................

2.3.3 Installation on Linux ........................................................................

2.4 ?e Android Studio Setup Wizard ........................................................................

............................5

2.5 Installing Additional Android SDK Packages ........................................................................

.........6

2.6 Making the Android SDK Tools Command-line Accessible .........................................................8

2.6.1 Windows 7........................................................................

2.6.2 Windows 8.1 ........................................................................

2.6.3 Windows 10 ........................................................................

2.6.4 Linux ........................................................................

2.6.5 macOS ........................................................................

2.7 Updating Android Studio and the SDK ........................................................................

.................10

2.8 Summary ........................................................................

3. Creating an Example Android App in Android Studio ........................................................................

...11

3.1 About the Project ........................................................................

3.2 Creating a New Android Project ........................................................................

.............................11

3.3 De?ning the Project and SDK Settings ........................................................................

..................12

3.4 Creating an Activity ........................................................................

3.5 Modifying the Example Application ........................................................................

.......................14

3.6 Reviewing the Layout and Resource Files ........................................................................

..............21

3.7 Adding Interaction ........................................................................

3.8 Summary ........................................................................

4. Creating an Android Virtual Device (AVD) in Android Studio .............................................................25

4.1 About Android Virtual Devices ........................................................................

..............................25

4.2 Creating a New AVD ........................................................................

4.3 Starting the Emulator ........................................................................

4.4 Running the Application in the AVD ........................................................................

.....................27

4.5 Run/Debug Con?gurations........................................................................

......................................29

4.6 Stopping a Running Application ........................................................................

.............................30

4.7 AVD Command-line Creation ........................................................................

................................30

4.8 Android Virtual Device Con?guration Files ........................................................................

.........32

4.9 Moving and Renaming an Android Virtual Device .....................................................................32

4.10 Summary ........................................................................

5. Using and Con?guring the Android Studio AVD Emulator ..................................................................33

5.1 e Emulator Environment ........................................................................

.....................................33

5.2 ?e Emulator Toolbar Options ........................................................................

................................33

5.3 Working in Zoom Mode ........................................................................

5.4 Resizing the Emulator Window........................................................................

...............................35

5.5 Extended Control Options ........................................................................

5.5.1 Location ........................................................................

5.5.2 Cellular ........................................................................

5.5.3 Camera ........................................................................

5.5.4 Battery ........................................................................

5.5.5 Phone ........................................................................

5.5.6 Directional Pad ........................................................................

5.5.7 Microphone ........................................................................

5.5.8 Fingerprint ........................................................................

5.5.9 Virtual Sensors ........................................................................

5.5.10 Snapshots ........................................................................

5.5.11 Screen Record ........................................................................

5.5.12 Google Play ........................................................................

5.5.13 Settings ........................................................................

5.5.14 Help ........................................................................

5.6 Working with Snapshots ........................................................................

5.7 Drag and Drop Support ........................................................................

5.8 Con?guring Fingerprint Emulation ........................................................................

.......................39

5.9 Summary ........................................................................

6. A Tour of the Android Studio User Interface ........................................................................

..................41

6.1 e Welcome Screen ........................................................................

6.2 ?e Main Window ........................................................................

6.3 ?e Tool Windows ........................................................................

6.4 Android Studio Keyboard Shortcuts ........................................................................

......................46

6.5 Switcher and Recent Files Navigation ........................................................................

....................46

6.6 Changing the Android Studio ?eme ........................................................................

....................47

6.7 Summary ........................................................................

7. Testing Android Studio Apps on a Physical Android Device ..................................................................49

7.1 An Overview of the Android Debug Bridge (ADB) .....................................................................49

7.2 Enabling ADB on Android based Devices ........................................................................

............49

7.2.1 macOS ADB Con?guration ........................................................................

..............................50

7.2.2 Windows ADB Con?guration ........................................................................

..........................51

7.2.3 Linux adb Con?guration ........................................................................

...................................52

7.3 Testing the adb Connection ........................................................................

.....................................52

7.4 Summary ........................................................................

8. ?e Basics of the Android Studio Code Editor ........................................................................

................55

8.1 e Android Studio Editor........................................................................

8.2 Splitting the Editor Window ........................................................................

....................................57

8.3 Code Completion ........................................................................

8.4 Statement Completion ........................................................................

8.5 Parameter Information ........................................................................

8.6 Parameter Name Hints ........................................................................

iii

8.7 Code Generation ........................................................................

8.8 Code Folding ........................................................................

8.9 Quick Documentation Lookup ........................................................................

...............................62

8.10 Code Reformatting........................................................................

8.11 Finding Sample Code ........................................................................

8.12 Summary ........................................................................

9. An Overview of the Android Architecture ........................................................................

......................65

9.1 e Android Soware Stack ........................................................................

....................................65

9.2 ?e Linux Kernel ........................................................................

9.3 Android Runtime - ART ........................................................................

9.4 Android Libraries ........................................................................

9.4.1 C/C++ Libraries ........................................................................

9.5 Application Framework ........................................................................

9.6 Applications ........................................................................

9.7 Summary ........................................................................

10. ?e Anatomy of an Android Application ........................................................................

......................69

10.1 Android Activities ........................................................................

10.2 Android Fragments ........................................................................

10.3 Android Intents ........................................................................

10.4 Broadcast Intents ........................................................................

10.5 Broadcast Receivers ........................................................................

10.6 Android Services ........................................................................

10.7 Content Providers ........................................................................

10.8 ?e Application Manifest ........................................................................

10.9 Application Resources ........................................................................

10.10 Application Context ........................................................................

10.11 Summary ........................................................................

11. An Introduction to Kotlin ........................................................................

11.1 What is Kotlin? ........................................................................

11.2 Kotlin and Java ........................................................................

11.3 Converting from Java to Kotlin ........................................................................

.............................73

11.4 Kotlin and Android Studio ........................................................................

....................................74

11.5 Experimenting with Kotlin ........................................................................

....................................74

11.6 Semi-colons in Kotlin ........................................................................

11.7 Summary ........................................................................

12. Kotlin Data Types,Variables and Nullability ........................................................................

.................77

12.1 Kotlin Data Types ........................................................................

12.1.1 Integer Data Types ........................................................................

12.1.2 Floating Point Data Types ........................................................................

..............................78

12.1.3 Boolean Data Type ........................................................................

12.1.4 Character Data Type ........................................................................

12.1.5 String Data Type ........................................................................

12.1.6 Escape Sequences ........................................................................

12.2 Mutable Variables ........................................................................

12.3 Immutable Variables ........................................................................

12.4 Declaring Mutable and Immutable Variables ........................................................................

......80

12.5 Data Types are Objects ........................................................................

12.6 Type Annotations and Type Inference ........................................................................

.................81

12.7 Nullable Type ........................................................................

12.8 ?e Safe Call Operator ........................................................................

12.9 Not-Null Assertion ........................................................................

12.10 Nullable Types and the let Function ........................................................................

...................83

12.11 ?e Elvis Operator ........................................................................

12.12 Type Casting and Type Checking ........................................................................

.......................85

12.13 Summary ........................................................................

13. Kotlin Operators and Expressions ........................................................................

.................................87

13.1 Expression Syntax in Kotlin ........................................................................

...................................87

13.2 ?e Basic Assignment Operator ........................................................................

............................87

13.3 Kotlin Arithmetic Operators ........................................................................

.................................87

13.4 Augmented Assignment Operators ........................................................................

......................88

13.5 Increment and Decrement Operators ........................................................................

..................88

13.6 Equality Operators ........................................................................

13.7 Boolean Logical Operators ........................................................................

....................................89

13.8 Range Operator ........................................................................

13.9 Bitwise Operators ........................................................................

13.9.1 Bitwise Inversion ........................................................................

13.9.2 Bitwise AND ........................................................................

13.9.3 Bitwise OR ........................................................................

13.9.4 Bitwise XOR ........................................................................

13.9.5 Bitwise Le? Shi? ........................................................................

13.9.6 Bitwise Right Shi? ........................................................................

13.10 Summary ........................................................................

14. Kotlin Flow Control ........................................................................

14.1 Looping Flow Control ........................................................................

14.1.1 ?e Kotlin for-in Statement ........................................................................

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