The First Line of Code is a must-have for developers who want to learn Android and Kotlin, and the best-seller in China. Knowledge between Android and Kotlin is interspersed in a way that readers are easy to understand and get start:

· Android part covers all the important aspects of the Android platform, such as activity, service, content provider, broadcast receiver, fragment, basic UI, data storage, network, Jetpack and other application-level knowledge.

· Kotlin part covers various aspects of Kotlin, such as standard grammar, common skills, higher-order functions, generics, coroutines, DSL and other language-level knowledge.

In addition, The First Line of Code is a very practicing book, illustrating concepts with a complete weather forecast program. You can use and practice all the knowledge comprehensively after learning and see the actual result for what you have learned through the book.

All contents of the book are quite easy to understand. It might be a good choice for both beginners and experienced developers. Also suitable for college students, college teachers, etc.

Lin Guo. An Android developer working in Microsoft. The Second Android GDE (Google Developer Expert) in China. Engaged in Android development since 2010. With well developing experience and wrote several popular open-source libraries on GitHub.

He maintains a technical blog on CSDN (one of Chinese largest computer technical forum) since 2013 and posted over 100 articles for sharing developing skills. Currently the blog has more than 10 million visits.

First Line of Android (Chinese Edition) is written by him and has been well received by readers since published. The first two editions of this book have already sold more than 250,000 copies, which is the best-seller in books of Android in China.

Chapter 1 Start the Journey - Writing Your First Line of Code

1.1 A Quick Introduction to Android

1.2 Setting up Development Environment

1.3 Build Your First Android Project

1.4 Master the use of Logging Tools

Chapter 2 Explore New Language - A Quick Introduction to Kotlin

2.1 Introduction to Kotlin

2.2 How to Run Kotlin Code

2.3 The Essence of Programming - Variable and Function

2.4 Program's Logic Control

2.5 Object-Oriented Programming

2.6 Lambda Programming

2.7 Nullable Type System

2.8 Tricks in Kotlin

Chapter 3 Start with What We can See - Exploring Activity

3.1 What is Activity?

3.2 Basic Usage of Activity

3.3 Navigating between Activities with Intent

3.4 Lifecycle of Activity

3.5 Launch Mode of Activity

3.6 Best Practice of Using Activity

3.7 Kotlin Class - Standard and Static Functions

3.8 Summary and Reviews

Chapter 4 Better Looking Better Apps - Introduction to UI Development

4.1 How to Write User Interface?

4.2 Usage of Common Widgets

4.3 Usage of Main Layouts

4.4 Widget not Enough? Create Your Own Widget

4.5 Powerful and Painful Widget - ListView

4.6 More Powerful and Better Widget - RecyclerView

4.7 Best Practice of Writing User Interface

4.8 Kotlin Class - Lateinit and Sealed Class

4.9 Summary and Reviews

Chapter 5 A Huge Extension of Activity - Exploring Fragment

5.1 What is Fragment?

5.2 Basic Usage of Fragment

5.3 Lifecycle of Fragment

5.4 Inflating Layouts Dynamically

5.6 Kotlin Class - Extension Functions and Operator Overloading

5.7 Summary and Reviews

Chapter 6 System Scope Loudspeaker - Introduction to Broadcasts

6.1 Broadcast Mechanism in Android

6.2 Receive System Broadcasts

6.3 Send Custom Broadcasts

6.4 Best Practice of Using BroadcastReceiver - Force to Offline

6.5 Kotlin Class - Introduction to Higher-order Functions

6.6 Git Time - Take a Glance at Git

6.7 Summary and Reviews

Chapter 7 Data Saving Solutions - Introduction to Persistence

7.1 Persistence Mechanism in Android

7.2 Using File

7.3 Using SharedPreferences

7.4 Using SQLite

7.5 Best Practice of Using Database

7.6 Kotlin Class - Higher-order Functions in Action

7.7 Summary and Reviews

Chapter 8 Share Data Across Applications - Exploring ContentProvider

8.1 Introduction to ContentProvider

8.2 Runtime Permissions

8.3 Acess Data from Other Applications

8.4 Create Your Own ContentProvider

8.5 Kotlin Class - Generics and Delegation

8.6 Summary and Reviews

Chapter 9 Enrich Your Application - With Features on Real Phone

9.1 Running Application on Real Phone

9.2 Usage of Notifications

9.3 Take Picture from Camera and Album

9.4 Play Audio and Video Files

9.5 Kotlin Class - Write Readable Syntax with infix Notation

9.6 Git Time - Try More Git Skills

9.7 Summary and Reviews

Chapter 10 Background Workers - Exploring Service

10.1 What is Service?

10.2 Android Thread Programming

10.4 Lifecycle of Service

10.5 Foreground Service and IntentService

10.6 Kotlin Class - Generics in Advanced

10.7 Summary and Reviews

Chapter 11 Exploring the World - With Network Technologies

11.1 Usage of WebView

11.2 Request with HTTP

11.3 Parse XML-formatted Data

11.4 Parse JSON-formatted Data

11.5 Best Practice of Implementing Network Callback

11.6 Usage of Retrofit

11.7 Kotlin Class - Write Concurrent Programs with Coroutines

Chapter 12 Best UI Experience - Material Design in Action

12.1 What is Material Design?

12.2 Toolbar

12.3 DrawerLayout and NavigationView

12.4 FloatingActionButton and Snackbar

12.5 MaterialCardView

12.6 SwipeRefreshLayout

12.7 CollapsingToolbarLayout

12.8 Kotlin Class - Write Handy Util Functions

12.9 Git Time - Branch and Remote Repository

12.10 Summary and Reviews

Chapter 13 High-quality Developing Components - Exploring Jetpack

13.1 Introduction to Jetpack

13.2 ViewModel

13.3 Lifecycles

13.4 LiveData

13.5 Room

13.6 WorkManager

13.7 Kotlin Class - Make DSL Useful

13.8 Summary and Reviews

Chapter 14 Keep Step Up - More Skills You Need to Know

14.1 Obtain Context Anywhere

14.2 Pass Objects with Intent

14.3 Write Your Own Logging Tool

14.4 Debug Android Programs

14.5 Dark Theme

14.6 Kotlin Class - Convert Codes between Java and Kotlin

14.7 Summary and Reviews

Chapter 15 Real Project Practice - Write an Weather Application

15.1 Analysis before Start

15.2 Git Time - Host Your Codes on GitHub

15.3 Introduction to MVVM

15.4 Search Places around World

15.5 Show Weather Information

15.6 Refresh Weather and Switch Places

15.7 Make Launch Icon for Application

15.8 Generate Signed APK

15.9 More Your can Do

Chapter 16 Write and Publish an Open Source Library - PermissionX

16.1 Analysis before Start

16.2 Write PermissionX

16.3 Test before Publish

16.4 Publish to Jcenter

16.5 Experience Our Work

16.6 Concluding Remarks