Book Image

Learn Spring for Android Application Development

By : S. M. Mohi Us Sunnat, Igor Kucherenko
Book Image

Learn Spring for Android Application Development

By: S. M. Mohi Us Sunnat, Igor Kucherenko

Overview of this book

As the new official language for Android, Kotlin is attracting new as well as existing Android developers. As most developers are still working with Java and want to switch to Kotlin, they find a combination of these two appealing. This book addresses this interest by bringing together Spring, a widely used Java SE framework for building enterprise-grade applications, and Kotlin. Learn Spring for Android Application Development will guide you in leveraging some of the powerful modules of the Spring Framework to build lightweight and robust Android apps using Kotlin. You will work with various modules, such as Spring AOP, Dependency Injection, and Inversion of Control, to develop applications with better dependency management. You’ll also explore other modules of the Spring Framework, such as Spring MVC, Spring Boot, and Spring Security. Each chapter has practice exercises at the end for you to assess your learning. By the end of the book, you will be fully equipped to develop Android applications with Spring technologies.

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Table of Contents (13 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Get in touch
Free Chapter
1
About the Environment
About the Environment
Technical requirements
Setting up the environment
Android
Summary
Questions
Further reading
2
Overview of Kotlin
Overview of Kotlin
Technical requirements
Introduction to Kotlin
Setting up the environment
Build tools
Basic syntax
Object-oriented programming
Functions
Control flow elements
Ranges
String templates
Null safety, reflection, and annotations
Summary
Questions
Further reading
3
Overview of Spring Framework
Overview of Spring Framework
Technical requirements
Introduction to Spring
Configuring beans
Spring MVC
SpringBoot
Summary
Questions
Further reading
4
Spring Modules for Android
Spring Modules for Android
Technical requirements
REST client module
The RestTemplate module
Gradle and Maven repository
Retrofit
Creating an Android app
Summary
Questions
Further reading
5
Securing Applications with Spring Security
Securing Applications with Spring Security
Technical requirements
Spring Security architecture
The advantages of Spring Security
Spring Security features
Spring Security modules
Securing REST with basic authentication
Creating an Android app
Securing REST with Spring Security OAuth2
Summary
Questions
Further reading
6
Accessing the Database
Accessing the Database
Technical requirements
Database
Database management system
Data access in the Spring
Java database connectivity in Spring
Creating a sample project using JDBC
Java Persistence API
Creating a project using JPA
Database of client-side application
Architecture components
Creating an Android app
Summary
Questions
Further reading
7
Concurrency
Concurrency
Technical requirements
Coroutines
Sequential operations
Callback hell
Thread pools
Summary
Questions
Further reading
8
Reactive Programming
Reactive Programming
Technical requirements
Reactive programming with Spring Reactor
Blocking and non-blocking
RxJava
RxJava in Android
Summary
Questions
Further reading
9
Creating an Application
Creating an Application
Technical requirements
Project idea
Server side
Client side
Summary
Questions
Further reading
10
Testing an Application
Testing an Application
Technical requirements
Software testing
JUnit
UI testing on Android
Espresso
Summary
Questions
Further reading
11
Assessments
Assessments
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
12
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Control flow elements

In Kotlin, control flow elements are expressions. This is different from Java, in which they are statements. Statements just specify the flow of a program, and don't return any values. This section will cover the following control flow elements:

  • The if { ... } else { ... } expression
  • The when { ... } expression

The if { ... } else { ... } expression

In Kotlin, the if control flow element can be used in the same way as it is used in Java. The following example demonstrates the use of if as a usual statement:

fun ifStatement() {
    val a = 4
    if (a < 5) {
        println(a)
    }
}

If you are using the if { ... } else { ... } control flow element as an expression, you have to declare the else...

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