Book Image

Android Studio 4.1 Development Essentials – Kotlin Edition

By : Neil Smyth
Book Image

Android Studio 4.1 Development Essentials – Kotlin Edition

By: Neil Smyth

Overview of this book

Android 11 has a ton of new capabilities. It comes up with three foci: a people-centric approach to communication, controls to let users quickly access and manage all of their smart devices, and privacy to give users more ways to control how data on devices is shared. This book starts off with the steps necessary to set up an Android development and testing environment, followed by an introduction to programming in Kotlin. An overview of Android Studio and its architecture is provided, followed by an in-depth look at the design of Android applications and user interfaces using the Android Studio environment. You will also learn about the Android architecture components along with some advanced topics such as touch screen handling, gesture recognition, the recording and playback of audio, app links, dynamic delivery, the AndroidStudio profiler, Gradle build configuration, and submitting apps to the Google Play Developer Console. The concepts of material design are also covered in detail. This edition of the book also covers printing, transitions, and cloud-based file storage; foldable device support is the cherry on the cake. By the end of this course, you will be able to develop Android 11 Apps using Android Studio 4.1, Kotlin, and Android Jetpack. The code files for the book can be found here: https://www.ebookfrenzy.com/retail/as41kotlin/index.php

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Table of Contents (95 chapters)
1
1. Introduction
1. Introduction
1.1 Downloading the Code Samples
1.2 Feedback
1.3 Errata
Free Chapter
2
2. Setting up an Android Studio Development Environment
2. Setting up an Android Studio Development Environment
2.1 System Requirements
2.2 Downloading the Android Studio Package
2.3 Installing Android Studio
2.4 The Android Studio Setup Wizard
2.5 Installing Additional Android SDK Packages
2.6 Making the Android SDK Tools Command-line Accessible
2.7 Android Studio Memory Management
2.8 Updating Android Studio and the SDK
2.9 Summary
3
3. Creating an Example Android App in Android Studio
3. Creating an Example Android App in Android Studio
3.1 About the Project
3.2 Creating a New Android Project
3.3 Creating an Activity
3.4 Defining the Project and SDK Settings
3.5 Modifying the Example Application
3.6 Modifying the User Interface
3.7 Reviewing the Layout and Resource Files
3.8 Adding the Kotlin Extensions Plugin
3.9 Adding Interaction
3.10 Summary
4
4. Creating an Android Virtual Device (AVD) in Android Studio
4. Creating an Android Virtual Device (AVD) in Android Studio
4.1 About Android Virtual Devices
4.2 Creating a New AVD
4.3 Starting the Emulator
4.4 Running the Application in the AVD
4.5 Running on Multiple Devices
4.6 Stopping a Running Application
4.7 Supporting Dark Theme
4.8 Running the Emulator in a Tool Window
4.9 AVD Command-line Creation
4.10 Android Virtual Device Configuration Files
4.11 Moving and Renaming an Android Virtual Device
4.12 Summary
5
5. Using and Configuring the Android Studio AVD Emulator
5. Using and Configuring the Android Studio AVD Emulator
5.1 The Emulator Environment
5.2 The Emulator Toolbar Options
5.3 Working in Zoom Mode
5.4 Resizing the Emulator Window
5.5 Extended Control Options
5.6 Working with Snapshots
5.7 Configuring Fingerprint Emulation
5.8 The Emulator in Tool Window Mode
5.9 Summary
6
6. A Tour of the Android Studio User Interface
6. A Tour of the Android Studio User Interface
6.1 The Welcome Screen
6.2 The Main Window
6.3 The Tool Windows
6.4 Android Studio Keyboard Shortcuts
6.5 Switcher and Recent Files Navigation
6.6 Changing the Android Studio Theme
6.7 Summary
7
7. Testing Android Studio Apps on a Physical Android Device
7. Testing Android Studio Apps on a Physical Android Device
7.1 An Overview of the Android Debug Bridge (ADB)
7.2 Enabling ADB on Android based Devices
7.3 Testing the adb Connection
7.4 Summary
8
8. The Basics of the Android Studio Code Editor
8. The Basics of the Android Studio Code Editor
8.1 The Android Studio Editor
8.2 Splitting the Editor Window
8.3 Code Completion
8.4 Statement Completion
8.5 Parameter Information
8.6 Parameter Name Hints
8.7 Code Generation
8.8 Code Folding
8.9 Quick Documentation Lookup
8.10 Code Reformatting
8.11 Finding Sample Code
8.12 Live Templates
8.13 Summary
9
9. An Overview of the Android Architecture
9. An Overview of the Android Architecture
9.1 The Android Software Stack
9.2 The Linux Kernel
9.3 Android Runtime – ART
9.4 Android Libraries
9.5 Application Framework
9.6 Applications
9.7 Summary
10
10. The Anatomy of an Android Application
10. The Anatomy of an Android Application
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 The Application Manifest
10.9 Application Resources
10.10 Application Context
10.11 Summary
11
11. An Introduction to Kotlin
11. An Introduction to Kotlin
11.1 What is Kotlin?
11.2 Kotlin and Java
11.3 Converting from Java to Kotlin
11.4 Kotlin and Android Studio
11.5 Experimenting with Kotlin
11.6 Semi-colons in Kotlin
11.7 Summary
12
12. Kotlin Data Types,Variables and Nullability
12. Kotlin Data Types,Variables and Nullability
12.1 Kotlin Data Types
12.2 Mutable Variables
12.3 Immutable Variables
12.4 Declaring Mutable and Immutable Variables
12.5 Data Types are Objects
12.6 Type Annotations and Type Inference
12.7 Nullable Type
12.8 The Safe Call Operator
12.9 Not-Null Assertion
12.10 Nullable Types and the let Function
12.11 Late Initialization (lateinit)
12.12 The Elvis Operator
12.13 Type Casting and Type Checking
12.14 Summary
13
13. Kotlin Operators and Expressions
13. Kotlin Operators and Expressions
13.1 Expression Syntax in Kotlin
13.2 The Basic Assignment Operator
13.3 Kotlin Arithmetic Operators
13.4 Augmented Assignment Operators
13.5 Increment and Decrement Operators
13.6 Equality Operators
13.7 Boolean Logical Operators
13.8 Range Operator
13.9 Bitwise Operators
13.10 Summary
14
14. Kotlin Flow Control
14. Kotlin Flow Control
14.1 Looping Flow Control
14.2 Conditional Flow Control
14.3 Summary
15
15. An Overview of Kotlin Functions and Lambdas
15. An Overview of Kotlin Functions and Lambdas
15.1 What is a Function?
15.2 How to Declare a Kotlin Function
15.3 Calling a Kotlin Function
15.4 Single Expression Functions
15.5 Local Functions
15.6 Handling Return Values
15.7 Declaring Default Function Parameters
15.8 Variable Number of Function Parameters
15.9 Lambda Expressions
15.10 Higher-order Functions
15.11 Summary
16
16. The Basics of Object Oriented Programming in Kotlin
16. The Basics of Object Oriented Programming in Kotlin
16.1 What is an Object?
16.2 What is a Class?
16.3 Declaring a Kotlin Class
16.4 Adding Properties to a Class
16.5 Defining Methods
16.6 Declaring and Initializing a Class Instance
16.7 Primary and Secondary Constructors
16.8 Initializer Blocks
16.9 Calling Methods and Accessing Properties
16.10 Custom Accessors
16.11 Nested and Inner Classes
16.12 Companion Objects
16.13 Summary
17
17. An Introduction to Kotlin Inheritance and Subclassing
17. An Introduction to Kotlin Inheritance and Subclassing
17.1 Inheritance, Classes and Subclasses
17.2 Subclassing Syntax
17.3 A Kotlin Inheritance Example
17.4 Extending the Functionality of a Subclass
17.5 Overriding Inherited Methods
17.6 Adding a Custom Secondary Constructor
17.7 Using the SavingsAccount Class
17.8 Summary
18
18. An Overview of Android View Binding
18. An Overview of Android View Binding
18.1 Find View by ID and Synthetic Properties
18.2 View Bindings
18.3 Converting the AndroidSample Project
18.4 Enabling View Binding
18.5 Using View Bindings
18.6 Choosing an Option
18.7 Summary
19
19. Understanding Android Application and Activity Lifecycles
19. Understanding Android Application and Activity Lifecycles
19.1 Android Applications and Resource Management
19.2 Android Process States
19.3 Inter-Process Dependencies
19.4 The Activity Lifecycle
19.5 The Activity Stack
19.6 Activity States
19.7 Configuration Changes
19.8 Handling State Change
19.9 Summary
20
20. Handling Android Activity State Changes
20. Handling Android Activity State Changes
20.1 New vs. Old Lifecycle Techniques
20.2 The Activity and Fragment Classes
20.3 Dynamic State vs. Persistent State
20.4 The Android Lifecycle Methods
20.5 Lifetimes
20.6 Foldable Devices and Multi-Resume
20.7 Disabling Configuration Change Restarts
20.8 Lifecycle Method Limitations
20.9 Summary
21
21. Android Activity State Changes by Example
21. Android Activity State Changes by Example
21.1 Creating the State Change Example Project
21.2 Designing the User Interface
21.3 Overriding the Activity Lifecycle Methods
21.4 Filtering the Logcat Panel
21.5 Running the Application
21.6 Experimenting with the Activity
21.7 Summary
22
22. Saving and Restoring the State of an Android Activity
22. Saving and Restoring the State of an Android Activity
22.1 Saving Dynamic State
22.2 Default Saving of User Interface State
22.3 The Bundle Class
22.4 Saving the State
22.5 Restoring the State
22.6 Testing the Application
22.7 Summary
23
23. Understanding Android Views, View Groups and Layouts
23. Understanding Android Views, View Groups and Layouts
23.1 Designing for Different Android Devices
23.2 Views and View Groups
23.3 Android Layout Managers
23.4 The View Hierarchy
23.5 Creating User Interfaces
23.6 Summary
24
24. A Guide to the Android Studio Layout Editor Tool
24. A Guide to the Android Studio Layout Editor Tool
24.1 Basic vs. Empty Activity Templates
24.2 The Android Studio Layout Editor
24.3 Design Mode
24.4 The Palette
24.5 Design Mode and Layout Views
24.6 Code Mode
24.7 Split Mode
24.8 Setting Attributes
24.9 Transforms
24.10 Tools Visibility Toggles
24.11 Converting Views
24.12 Displaying Sample Data
24.13 Creating a Custom Device Definition
24.14 Changing the Current Device
24.15 Layout Validation (Multi Preview)
24.16 Summary
25
25. A Guide to the Android ConstraintLayout
25. A Guide to the Android ConstraintLayout
25.1 How ConstraintLayout Works
25.2 Baseline Alignment
25.3 Configuring Widget Dimensions
25.4 Guideline Helper
25.5 Group Helper
25.6 Barrier Helper
25.7 Flow Helper
25.8 Ratios
25.9 ConstraintLayout Advantages
25.10 ConstraintLayout Availability
25.11 Summary
26
26. A Guide to using ConstraintLayout in Android Studio
26. A Guide to using ConstraintLayout in Android Studio
26.1 Design and Layout Views
26.2 Autoconnect Mode
26.3 Inference Mode
26.4 Manipulating Constraints Manually
26.5 Adding Constraints in the Inspector
26.6 Viewing Constraints in the Attributes Window
26.7 Deleting Constraints
26.8 Adjusting Constraint Bias
26.9 Understanding ConstraintLayout Margins
26.10 The Importance of Opposing Constraints and Bias
26.11 Configuring Widget Dimensions
26.12 Design Time Tools Positioning
26.13 Adding Guidelines
26.14 Adding Barriers
26.15 Adding a Group
26.16 Working with the Flow Helper
26.17 Widget Group Alignment and Distribution
26.18 Converting other Layouts to ConstraintLayout
26.19 Summary
27
27. Working with ConstraintLayout Chains and Ratios in Android Studio
27. Working with ConstraintLayout Chains and Ratios in Android Studio
27.1 Creating a Chain
27.2 Changing the Chain Style
27.3 Spread Inside Chain Style
27.4 Packed Chain Style
27.5 Packed Chain Style with Bias
27.6 Weighted Chain
27.7 Working with Ratios
27.8 Summary
28
28. An Android Studio Layout Editor ConstraintLayout Tutorial
28. An Android Studio Layout Editor ConstraintLayout Tutorial
28.1 An Android Studio Layout Editor Tool Example
28.2 Creating a New Activity
28.3 Preparing the Layout Editor Environment
28.4 Adding the Widgets to the User Interface
28.5 Adding the Constraints
28.6 Testing the Layout
28.7 Using the Layout Inspector
28.8 Summary
29
29. Manual XML Layout Design in Android Studio
29. Manual XML Layout Design in Android Studio
29.1 Manually Creating an XML Layout
29.2 Manual XML vs. Visual Layout Design
29.3 Summary
30
30. Managing Constraints using Constraint Sets
30. Managing Constraints using Constraint Sets
30.1 Kotlin Code vs. XML Layout Files
30.2 Creating Views
30.3 View Attributes
30.4 Constraint Sets
30.5 Summary
31
31. An Android ConstraintSet Tutorial
31. An Android ConstraintSet Tutorial
31.1 Creating the Example Project in Android Studio
31.2 Adding Views to an Activity
31.3 Setting View Attributes
31.4 Creating View IDs
31.5 Configuring the Constraint Set
31.6 Adding the EditText View
31.7 Converting Density Independent Pixels (dp) to Pixels (px)
31.8 Summary
32
32. A Guide to using Apply Changes in Android Studio
32. A Guide to using Apply Changes in Android Studio
32.1 Introducing Apply Changes
32.2 Understanding Apply Changes Options
32.3 Using Apply Changes
32.4 Configuring Apply Changes Fallback Settings
32.5 An Apply Changes Tutorial
32.6 Using Apply Code Changes
32.7 Using Apply Changes and Restart Activity
32.8 Using Run App
32.9 Summary
33
33. An Overview and Example of Android Event Handling
33. An Overview and Example of Android Event Handling
33.1 Understanding Android Events
33.2 Using the android:onClick Resource
33.3 Event Listeners and Callback Methods
33.4 An Event Handling Example
33.5 Designing the User Interface
33.6 The Event Listener and Callback Method
33.7 Consuming Events
33.8 Summary
34
34. Android Touch and Multi-touch Event Handling
34. Android Touch and Multi-touch Event Handling
34.1 Intercepting Touch Events
34.2 The MotionEvent Object
34.3 Understanding Touch Actions
34.4 Handling Multiple Touches
34.5 An Example Multi-Touch Application
34.6 Designing the Activity User Interface
34.7 Implementing the Touch Event Listener
34.8 Running the Example Application
34.9 Summary
35
35. Detecting Common Gestures using the Android Gesture Detector Class
35. Detecting Common Gestures using the Android Gesture Detector Class
35.1 Implementing Common Gesture Detection
35.2 Creating an Example Gesture Detection Project
35.3 Implementing the Listener Class
35.4 Creating the GestureDetectorCompat Instance
35.5 Implementing the onTouchEvent() Method
35.6 Testing the Application
35.7 Summary
36
36. Implementing Custom Gesture and Pinch Recognition on Android
36. Implementing Custom Gesture and Pinch Recognition on Android
36.1 The Android Gesture Builder Application
36.2 The GestureOverlayView Class
36.3 Detecting Gestures
36.4 Identifying Specific Gestures
36.5 Installing and Running the Gesture Builder Application
36.6 Creating a Gestures File
36.7 Creating the Example Project
36.8 Extracting the Gestures File from the SD Card
36.9 Adding the Gestures File to the Project
36.10 Designing the User Interface
36.11 Loading the Gestures File
36.12 Registering the Event Listener
36.13 Implementing the onGesturePerformed Method
36.14 Testing the Application
36.15 Configuring the GestureOverlayView
36.16 Intercepting Gestures
36.17 Detecting Pinch Gestures
36.18 A Pinch Gesture Example Project
36.19 Summary
37
37. An Introduction to Android Fragments
37. An Introduction to Android Fragments
37.1 What is a Fragment?
37.2 Creating a Fragment
37.3 Adding a Fragment to an Activity using the Layout XML File
37.4 Adding and Managing Fragments in Code
37.5 Handling Fragment Events
37.6 Implementing Fragment Communication
37.7 Summary
38
38. Using Fragments in Android Studio - An Example
38. Using Fragments in Android Studio - An Example
38.1 About the Example Fragment Application
38.2 Creating the Example Project
38.3 Creating the First Fragment Layout
38.4 Adding the Second Fragment
38.5 Adding the Fragments to the Activity
38.6 Making the Toolbar Fragment Talk to the Activity
38.7 Making the Activity Talk to the Text Fragment
38.8 Testing the Application
38.9 Summary
39
39. Modern Android App Architecture with Jetpack
39. Modern Android App Architecture with Jetpack
39.1 What is Android Jetpack?
39.2 The “Old” Architecture
39.3 Modern Android Architecture
39.4 The ViewModel Component
39.5 The LiveData Component
39.6 ViewModel Saved State
39.7 LiveData and Data Binding
39.8 Android Lifecycles
39.9 Repository Modules
39.10 Summary
40
40. An Android Jetpack ViewModel Tutorial
40. An Android Jetpack ViewModel Tutorial
40.1 About the Project
40.2 Creating the ViewModel Example Project
40.3 Reviewing the Project
40.4 Designing the Fragment Layout
40.5 Implementing the View Model
40.6 Associating the Fragment with the View Model
40.7 Modifying the Fragment
40.8 Accessing the ViewModel Data
40.9 Testing the Project
40.10 Summary
41
41. An Android Jetpack LiveData Tutorial
41. An Android Jetpack LiveData Tutorial
41.1 LiveData - A Recap
41.2 Adding LiveData to the ViewModel
41.3 Implementing the Observer
41.4 Summary
42
42. An Overview of Android Jetpack Data Binding
42. An Overview of Android Jetpack Data Binding
42.1 An Overview of Data Binding
42.2 The Key Components of Data Binding
42.3 Summary
43
43. An Android Jetpack Data Binding Tutorial
43. An Android Jetpack Data Binding Tutorial
43.1 Removing the Redundant Code
43.2 Enabling Data Binding
43.3 Adding the Layout Element
43.4 Adding the Data Element to Layout File
43.5 Working with the Binding Class
43.6 Assigning the ViewModel Instance to the Data Binding Variable
43.7 Adding Binding Expressions
43.8 Adding the Conversion Method
43.9 Adding a Listener Binding
43.10 Testing the App
43.11 Summary
44
44. An Android ViewModel Saved State Tutorial
44. An Android ViewModel Saved State Tutorial
44.1 Understanding ViewModel State Saving
44.2 Implementing ViewModel State Saving
44.3 Saving and Restoring State
44.4 Adding Saved State Support to the ViewModelDemo Project
44.5 Summary
45
45. Working with Android Lifecycle-Aware Components
45. Working with Android Lifecycle-Aware Components
45.1 Lifecycle Awareness
45.2 Lifecycle Owners
45.3 Lifecycle Observers
45.4 Lifecycle States and Events
45.5 Summary
46
46. An Android Jetpack Lifecycle Awareness Tutorial
46. An Android Jetpack Lifecycle Awareness Tutorial
46.1 Creating the Example Lifecycle Project
46.2 Creating a Lifecycle Observer
46.3 Adding the Observer
46.4 Testing the Observer
46.5 Creating a Lifecycle Owner
46.6 Testing the Custom Lifecycle Owner
46.7 Summary
47
47. An Overview of the Navigation Architecture Component
47. An Overview of the Navigation Architecture Component
47.1 Understanding Navigation
47.2 Declaring a Navigation Host
47.3 The Navigation Graph
47.4 Accessing the Navigation Controller
47.5 Triggering a Navigation Action
47.6 Passing Arguments
47.7 Summary
48
48. An Android Jetpack Navigation Component Tutorial
48. An Android Jetpack Navigation Component Tutorial
48.1 Creating the NavigationDemo Project
48.2 Adding Navigation to the Build Configuration
48.3 Creating the Navigation Graph Resource File
48.4 Declaring a Navigation Host
48.5 Adding Navigation Destinations
48.6 Designing the Destination Fragment Layouts
48.7 Adding an Action to the Navigation Graph
48.8 Implement the OnFragmentInteractionListener
48.9 Triggering the Action
48.10 Passing Data Using Safeargs
48.11 Summary
49
49. An Introduction to MotionLayout
49. An Introduction to MotionLayout
49.1 An Overview of MotionLayout
49.2 MotionLayout
49.3 MotionScene
49.4 Configuring ConstraintSets
49.5 Custom Attributes
49.6 Triggering an Animation
49.7 Arc Motion
49.8 Keyframes
49.9 Time Linearity
49.10 KeyTrigger
49.11 Cycle and Time Cycle Keyframes
49.12 Starting an Animation from Code
50
50. An Android MotionLayout Editor Tutorial
50. An Android MotionLayout Editor Tutorial
50.1 Creating the MotionLayoutDemo Project
50.2 ConstraintLayout to MotionLayout Conversion
50.3 Configuring Start and End Constraints
50.4 Previewing the MotionLayout Animation
50.5 Adding an OnClick Gesture
50.6 Adding an Attribute Keyframe to the Transition
50.7 Adding a CustomAttribute to a Transition
50.8 Adding Position Keyframes
50.9 Summary
51
51. A MotionLayout KeyCycle Tutorial
51. A MotionLayout KeyCycle Tutorial
51.1 An Overview of Cycle Keyframes
51.2 Using the Cycle Editor
51.3 Creating the KeyCycleDemo Project
51.4 Configuring the Start and End Constraints
51.5 Creating the Cycles
51.6 Previewing the Animation
51.7 Adding the KeyFrameSet to the MotionScene
51.8 Summary
52
52. Working with the Floating Action Button and Snackbar
52. Working with the Floating Action Button and Snackbar
52.1 The Material Design
52.2 The Design Library
52.3 The Floating Action Button (FAB)
52.4 The Snackbar
52.5 Creating the Example Project
52.6 Reviewing the Project
52.7 Removing Navigation Features
52.8 Changing the Floating Action Button
52.9 Adding the ListView to the Content Layout
52.10 Adding Items to the ListView
52.11 Adding an Action to the Snackbar
52.12 Summary
53
53. Creating a Tabbed Interface using the TabLayout Component
53. Creating a Tabbed Interface using the TabLayout Component
53.1 An Introduction to the ViewPager
53.2 An Overview of the TabLayout Component
53.3 Creating the TabLayoutDemo Project
53.4 Creating the First Fragment
53.5 Duplicating the Fragments
53.6 Adding the TabLayout and ViewPager
53.7 Creating the Pager Adapter
53.8 Performing the Initialization Tasks
53.9 Testing the Application
53.10 Customizing the TabLayout
53.11 Displaying Icon Tab Items
53.12 Summary
54
54. Working with the RecyclerView and CardView Widgets
54. Working with the RecyclerView and CardView Widgets
54.1 An Overview of the RecyclerView
54.2 An Overview of the CardView
54.3 Summary
55
55. An Android RecyclerView and CardView Tutorial
55. An Android RecyclerView and CardView Tutorial
55.1 Creating the CardDemo Project
55.2 Modifying the Basic Activity Project
55.3 Designing the CardView Layout
55.4 Adding the RecyclerView
55.5 Adding the Image Files
55.6 Creating the RecyclerView Adapter
55.7 Initializing the RecyclerView Component
55.8 Testing the Application
55.9 Responding to Card Selections
55.10 Summary
56
56. A Layout Editor Sample Data Tutorial
56. A Layout Editor Sample Data Tutorial
56.1 Adding Sample Data to a Project
56.2 Using Custom Sample Data
56.3 Summary
57
57. Working with the AppBar and Collapsing Toolbar Layouts
57. Working with the AppBar and Collapsing Toolbar Layouts
57.1 The Anatomy of an AppBar
57.2 The Example Project
57.3 Coordinating the RecyclerView and Toolbar
57.4 Introducing the Collapsing Toolbar Layout
57.5 Changing the Title and Scrim Color
57.6 Summary
58
58. An Android Studio Master/Detail Flow Tutorial
58. An Android Studio Master/Detail Flow Tutorial
58.1 The Master/Detail Flow
58.2 Creating a Master/Detail Flow Activity
58.3 The Anatomy of the Master/Detail Flow Template
58.4 Modifying the Master/Detail Flow Template
58.5 Changing the Content Model
58.6 Changing the Detail Pane
58.7 Modifying the WebsiteDetailFragment Class
58.8 Modifying the WebsiteListActivity Class
58.9 Adding Manifest Permissions
58.10 Running the Application
58.11 Summary
59
59. An Overview of Android Intents
59. An Overview of Android Intents
59.1 An Overview of Intents
59.2 Explicit Intents
59.3 Returning Data from an Activity
59.4 Implicit Intents
59.5 Using Intent Filters
59.6 Checking Intent Availability
59.7 Summary
60
60. Android Explicit Intents – A Worked Example
60. Android Explicit Intents – A Worked Example
60.1 Creating the Explicit Intent Example Application
60.2 Designing the User Interface Layout for MainActivity
60.3 Creating the Second Activity Class
60.4 Designing the User Interface Layout for ActivityB
60.5 Reviewing the Application Manifest File
60.6 Creating the Intent
60.7 Extracting Intent Data
60.8 Launching ActivityB as a Sub-Activity
60.9 Returning Data from a Sub-Activity
60.10 Testing the Application
60.11 Summary
61
61. Android Implicit Intents – A Worked Example
61. Android Implicit Intents – A Worked Example
61.1 Creating the Android Studio Implicit Intent Example Project
61.2 Designing the User Interface
61.3 Creating the Implicit Intent
61.4 Adding a Second Matching Activity
61.5 Adding the Web View to the UI
61.6 Obtaining the Intent URL
61.7 Modifying the MyWebView Project Manifest File
61.8 Installing the MyWebView Package on a Device
61.9 Testing the Application
61.10 Summary
62
62. Android Broadcast Intents and Broadcast Receivers
62. Android Broadcast Intents and Broadcast Receivers
62.1 An Overview of Broadcast Intents
62.2 An Overview of Broadcast Receivers
62.3 Obtaining Results from a Broadcast
62.4 Sticky Broadcast Intents
62.5 The Broadcast Intent Example
62.6 Creating the Example Application
62.7 Creating and Sending the Broadcast Intent
62.8 Creating the Broadcast Receiver
62.9 Registering the Broadcast Receiver
62.10 Testing the Broadcast Example
62.11 Listening for System Broadcasts
62.12 Summary
63
63. A Basic Overview of Threads and AsyncTasks
63. A Basic Overview of Threads and AsyncTasks
63.1 An Overview of Threads
63.2 The Application Main Thread
63.3 Thread Handlers
63.4 A Basic AsyncTask Example
63.5 Subclassing AsyncTask
63.6 Testing the App
63.7 Canceling a Task
63.8 Summary
64
64. An Introduction to Kotlin Coroutines
64. An Introduction to Kotlin Coroutines
64.1 What are Coroutines?
64.2 Threads vs Coroutines
64.3 Coroutine Scope
64.4 Suspend Functions
64.5 Coroutine Dispatchers
64.6 Coroutine Builders
64.7 Jobs
64.8 Coroutines – Suspending and Resuming
64.9 Returning Results from a Coroutine
64.10 Using withContext
64.11 Coroutine Channel Communication
64.12 Summary
65
65. An Android Kotlin Coroutines Tutorial
65. An Android Kotlin Coroutines Tutorial
65.1 Creating the Coroutine Example Application
65.2 Adding Coroutine Support to the Project
65.3 Designing the User Interface
65.4 Implementing the SeekBar
65.5 Adding the Suspend Function
65.6 Implementing the launchCoroutines Method
65.7 Testing the App
65.8 Summary
66
66. An Overview of Android Started and Bound Services
66. An Overview of Android Started and Bound Services
66.1 Started Services
66.2 Intent Service
66.3 Bound Service
66.4 The Anatomy of a Service
66.5 Controlling Destroyed Service Restart Options
66.6 Declaring a Service in the Manifest File
66.7 Starting a Service Running on System Startup
66.8 Summary
67
67. Implementing an Android Started Service – A Worked Example
67. Implementing an Android Started Service – A Worked Example
67.1 Creating the Example Project
67.2 Creating the Service Class
67.3 Adding the Service to the Manifest File
67.4 Starting the Service
67.5 Testing the IntentService Example
67.6 Using the Service Class
67.7 Creating the New Service
67.8 Modifying the User Interface
67.9 Running the Application
67.10 Using a Coroutine for the Service Task
67.11 Summary
68
68. Android Local Bound Services – A Worked Example
68. Android Local Bound Services – A Worked Example
68.1 Understanding Bound Services
68.2 Bound Service Interaction Options
68.3 An Android Studio Local Bound Service Example
68.4 Adding a Bound Service to the Project
68.5 Implementing the Binder
68.6 Binding the Client to the Service
68.7 Completing the Example
68.8 Testing the Application
68.9 Summary
69
69. Android Remote Bound Services – A Worked Example
69. Android Remote Bound Services – A Worked Example
69.1 Client to Remote Service Communication
69.2 Creating the Example Application
69.3 Designing the User Interface
69.4 Implementing the Remote Bound Service
69.5 Configuring a Remote Service in the Manifest File
69.6 Launching and Binding to the Remote Service
69.7 Sending a Message to the Remote Service
69.8 Summary
70
70. An Android Notifications Tutorial
70. An Android Notifications Tutorial
70.1 An Overview of Notifications
70.2 Creating the NotifyDemo Project
70.3 Designing the User Interface
70.4 Creating the Second Activity
70.5 Creating a Notification Channel
70.6 Creating and Issuing a Basic Notification
70.7 Launching an Activity from a Notification
70.8 Adding Actions to a Notification
70.9 Bundled Notifications
70.10 Summary
71
71. An Android Direct Reply Notification Tutorial
71. An Android Direct Reply Notification Tutorial
71.1 Creating the DirectReply Project
71.2 Designing the User Interface
71.3 Creating the Notification Channel
71.4 Building the RemoteInput Object
71.5 Creating the PendingIntent
71.6 Creating the Reply Action
71.7 Receiving Direct Reply Input
71.8 Updating the Notification
71.9 Summary
72
72. Foldable Devices and Multi-Window Support
72. Foldable Devices and Multi-Window Support
72.1 Foldables and Multi-Window Support
72.2 Using a Foldable Emulator
72.3 Entering Multi-Window Mode
72.4 Enabling and using Freeform Support
72.5 Checking for Freeform Support
72.6 Enabling Multi-Window Support in an App
72.7 Specifying Multi-Window Attributes
72.8 Detecting Multi-Window Mode in an Activity
72.9 Receiving Multi-Window Notifications
72.10 Launching an Activity in Multi-Window Mode
72.11 Configuring Freeform Activity Size and Position
72.12 Summary
73
73. An Overview of Android SQLite Databases
73. An Overview of Android SQLite Databases
73.1 Understanding Database Tables
73.2 Introducing Database Schema
73.3 Columns and Data Types
73.4 Database Rows
73.5 Introducing Primary Keys
73.6 What is SQLite?
73.7 Structured Query Language (SQL)
73.8 Trying SQLite on an Android Virtual Device (AVD)
73.9 The Android Room Persistence Library
73.10 Summary
74
74. The Android Room Persistence Library
74. The Android Room Persistence Library
74.1 Revisiting Modern App Architecture
74.2 Key Elements of Room Database Persistence
74.3 Understanding Entities
74.4 Data Access Objects
74.5 The Room Database
74.6 The Repository
74.7 In-Memory Databases
74.8 Database Inspector
74.9 Summary
75
75. An Android TableLayout and TableRow Tutorial
75. An Android TableLayout and TableRow Tutorial
75.1 The TableLayout and TableRow Layout Views
75.2 Creating the Room Database Project
75.3 Converting to a LinearLayout
75.4 Adding the TableLayout to the User Interface
75.5 Configuring the TableRows
75.6 Adding the Button Bar to the Layout
75.7 Adding the RecyclerView
75.8 Adjusting the Layout Margins
75.9 Summary
76
76. An Android Room Database and Repository Tutorial
76. An Android Room Database and Repository Tutorial
76.1 About the RoomDemo Project
76.2 Modifying the Build Configuration
76.3 Building the Entity
76.4 Creating the Data Access Object
76.5 Adding the Room Database
76.6 Adding the Repository
76.7 Modifying the ViewModel
76.8 Creating the Product Item Layout
76.9 Adding the RecyclerView Adapter
76.10 Preparing the Main Fragment
76.11 Adding the Button Listeners
76.12 Adding LiveData Observers
76.13 Initializing the RecyclerView
76.14 Testing the RoomDemo App
76.15 Using the Database Inspector
76.16 Summary
77
77. Accessing Cloud Storage using the Android Storage Access Framework
77. Accessing Cloud Storage using the Android Storage Access Framework
77.1 The Storage Access Framework
77.2 Working with the Storage Access Framework
77.3 Filtering Picker File Listings
77.4 Handling Intent Results
77.5 Reading the Content of a File
77.6 Writing Content to a File
77.7 Deleting a File
77.8 Gaining Persistent Access to a File
77.9 Summary
78
78. An Android Storage Access Framework Example
78. An Android Storage Access Framework Example
78.1 About the Storage Access Framework Example
78.2 Creating the Storage Access Framework Example
78.3 Designing the User Interface
78.4 Declaring Request Codes
78.5 Creating a New Storage File
78.6 The onActivityResult() Method
78.7 Saving to a Storage File
78.8 Opening and Reading a Storage File
78.9 Testing the Storage Access Application
78.10 Summary
79
79. Video Playback on Android using the VideoView and MediaController Classes
79. Video Playback on Android using the VideoView and MediaController Classes
79.1 Introducing the Android VideoView Class
79.2 Introducing the Android MediaController Class
79.3 Creating the Video Playback Example
79.4 Designing the VideoPlayer Layout
79.5 Downloading the Video File
79.6 Configuring the VideoView
79.7 Adding the MediaController to the Video View
79.8 Setting up the onPreparedListener
79.9 Summary
80
80. Android Picture-in-Picture Mode
80. Android Picture-in-Picture Mode
80.1 Picture-in-Picture Features
80.2 Enabling Picture-in-Picture Mode
80.3 Configuring Picture-in-Picture Parameters
80.4 Entering Picture-in-Picture Mode
80.5 Detecting Picture-in-Picture Mode Changes
80.6 Adding Picture-in-Picture Actions
80.7 Summary
81
81. An Android Picture-in-Picture Tutorial
81. An Android Picture-in-Picture Tutorial
81.1 Adding Picture-in-Picture Support to the Manifest
81.2 Adding a Picture-in-Picture Button
81.3 Entering Picture-in-Picture Mode
81.4 Detecting Picture-in-Picture Mode Changes
81.5 Adding a Broadcast Receiver
81.6 Adding the PiP Action
81.7 Testing the Picture-in-Picture Action
81.8 Summary
82
82. Making Runtime Permission Requests in Android
82. Making Runtime Permission Requests in Android
82.1 Understanding Normal and Dangerous Permissions
82.2 Creating the Permissions Example Project
82.3 Checking for a Permission
82.4 Requesting Permission at Runtime
82.5 Providing a Rationale for the Permission Request
82.6 Testing the Permissions App
82.7 Summary
83
83. Android Audio Recording and Playback using MediaPlayer and MediaRecorder
83. Android Audio Recording and Playback using MediaPlayer and MediaRecorder
83.1 Playing Audio
83.2 Recording Audio and Video using the MediaRecorder Class
83.3 About the Example Project
83.4 Creating the AudioApp Project
83.5 Designing the User Interface
83.6 Checking for Microphone Availability
83.7 Performing the Activity Initialization
83.8 Implementing the recordAudio() Method
83.9 Implementing the stopAudio() Method
83.10 Implementing the playAudio() method
83.11 Configuring and Requesting Permissions
83.12 Testing the Application
83.13 Summary
84
84. Printing with the Android Printing Framework
84. Printing with the Android Printing Framework
84.1 The Android Printing Architecture
84.2 The Print Service Plugins
84.3 Google Cloud Print
84.4 Printing to Google Drive
84.5 Save as PDF
84.6 Printing from Android Devices
84.7 Options for Building Print Support into Android Apps
84.8 Summary
85
85. An Android HTML and Web Content Printing Example
85. An Android HTML and Web Content Printing Example
85.1 Creating the HTML Printing Example Application
85.2 Printing Dynamic HTML Content
85.3 Creating the Web Page Printing Example
85.4 Removing the Floating Action Button
85.5 Removing Navigation Features
85.6 Designing the User Interface Layout
85.7 Loading the Web Page into the WebView
85.8 Adding the Print Menu Option
85.9 Summary
86
86. A Guide to Android Custom Document Printing
86. A Guide to Android Custom Document Printing
86.1 An Overview of Android Custom Document Printing
86.2 Preparing the Custom Document Printing Project
86.3 Creating the Custom Print Adapter
86.4 Implementing the onLayout() Callback Method
86.5 Implementing the onWrite() Callback Method
86.6 Checking a Page is in Range
86.7 Drawing the Content on the Page Canvas
86.8 Starting the Print Job
86.9 Testing the Application
86.10 Summary
87
87. An Introduction to Android App Links
87. An Introduction to Android App Links
87.1 An Overview of Android App Links
87.2 App Link Intent Filters
87.3 Handling App Link Intents
87.4 Associating the App with a Website
87.5 Summary
88
88. An Android Studio App Links Tutorial
88. An Android Studio App Links Tutorial
88.1 About the Example App
88.2 The Database Schema
88.3 Loading and Running the Project
88.4 Adding the URL Mapping
88.5 Adding the Intent Filter
88.6 Adding Intent Handling Code
88.7 Testing the App Link
88.8 Associating an App Link with a Web Site
88.9 Summary
89
89. A Guide to the Android Studio Profiler
89. A Guide to the Android Studio Profiler
89.1 Accessing the Android Profiler
89.2 Enabling Advanced Profiling
89.3 The Android Profiler Tool Window
89.4 The Sessions Panel
89.5 The CPU Profiler
89.6 Memory Profiler
89.7 Network Profiler
89.8 Energy Profiler
89.9 Summary
90
90. An Android Biometric Authentication Tutorial
90. An Android Biometric Authentication Tutorial
90.1 An Overview of Biometric Authentication
90.2 Creating the Biometric Authentication Project
90.3 Configuring Device Fingerprint Authentication
90.4 Adding the Biometric Permission to the Manifest File
90.5 Designing the User Interface
90.6 Adding a Toast Convenience Method
90.7 Checking the Security Settings
90.8 Configuring the Authentication Callbacks
90.9 Adding the CancellationSignal
90.10 Starting the Biometric Prompt
90.11 Testing the Project
90.12 Summary
91
91. Creating, Testing and Uploading an Android App Bundle
91. Creating, Testing and Uploading an Android App Bundle
91.1 The Release Preparation Process
91.2 Android App Bundles
91.3 Register for a Google Play Developer Console Account
91.4 Configuring the App in the Console
91.5 Enabling Google Play App Signing
91.6 Creating a Keystore File
91.7 Creating the Android App Bundle
91.8 Generating Test APK Files
91.9 Uploading the App Bundle to the Google Play Developer Console
91.10 Exploring the App Bundle
91.11 Managing Testers
91.12 Rolling the App Out for Testing
91.13 Uploading New App Bundle Revisions
91.14 Analyzing the App Bundle File
91.15 Summary
92
92. An Overview of Android Dynamic Feature Modules
92. An Overview of Android Dynamic Feature Modules
92.1 An Overview of Dynamic Feature Modules
92.2 Dynamic Feature Module Architecture
92.3 Creating a Dynamic Feature Module
92.4 Converting an Existing Module for Dynamic Delivery
92.5 Working with Dynamic Feature Modules
92.6 Handling Large Dynamic Feature Modules
92.7 Summary
93
93. An Android Studio Dynamic Feature Tutorial
93. An Android Studio Dynamic Feature Tutorial
93.1 Creating the DynamicFeature Project
93.2 Adding Dynamic Feature Support to the Project
93.3 Designing the Base Activity User Interface
93.4 Adding the Dynamic Feature Module
93.5 Reviewing the Dynamic Feature Module
93.6 Adding the Dynamic Feature Activity
93.7 Implementing the launchIntent() Method
93.8 Uploading the App Bundle for Testing
93.9 Implementing the installFeature() Method
93.10 Adding the Update Listener
93.11 Handling Large Downloads
93.12 Using Deferred Installation
93.13 Removing a Dynamic Module
93.14 Summary
94
94. An Overview of Gradle in Android Studio
94. An Overview of Gradle in Android Studio
94.1 An Overview of Gradle
94.2 Gradle and Android Studio
94.3 The Top-level Gradle Build File
94.4 Module Level Gradle Build Files
94.5 Configuring Signing Settings in the Build File
94.6 Running Gradle Tasks from the Command-line
94.7 Summary
95
Index
Index

12. Kotlin Data Types,Variables and Nullability

Both this and the following few chapters are intended to introduce the basics of the Kotlin programming language. This chapter will focus on the various data types available for use within Kotlin code. This will also include an explanation of constants, variables, type casting and Kotlin’s handling of null values.

As outlined in the previous chapter, entitled “An Introduction to Kotlin” a useful way to experiment with the language is to use the Kotlin online playground environment. Before starting this chapter, therefore, open a browser window, navigate to https://play.kotlinlang.org and use the playground to try out the code in both this and the other Kotlin introductory chapters that follow.

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