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The Comprehensive Guide to Kotlin Programming A Complete Reference Guide (Madison Giroux) (z-library.sk, 1lib.sk, z-lib.sk)
JavaAuthor：Madison Giroux
What You Will Learn: Foundational Kotlin Principles: Begin with an exploration of Kotlin's genesis at JetBrains, its evolutionary milestones, and its pivotal role in the Android ecosystem. Understand the advantages Kotlin holds over Java, such as enhanced conciseness, interoperability, coroutines for asynchronous programming, and robust safety features including null safety and immutability. Environment Setup and First Steps: Master the setup of your Kotlin development environment, embracing Android Studio for optimal productivity. Experience the thrill of writing and executing your first Kotlin program, gaining insights into the Kotlin main function, and understanding the compilation and execution process. Kotlin Syntax and Basics: Dive deep into the language's syntax, unraveling the nuances of variables, type inference, basic types, nullability, and coding standards that form the bedrock of Kotlin programming. Advanced Programming Constructs: Ascend to advanced topics such as generics, delegation, extension functions, null safety mechanisms, and exception handling. This section demystifies the use of annotations, reflection, and the creation of domain-specific languages, enhancing your capability to write concise and powerful Kotlin code. Concurrent Programming with Coroutines and Flow: Navigate the concurrency model with coroutines and Flow, learning to manage asynchronous tasks with grace and efficiency. This knowledge is crucial for developing responsive applications that handle background tasks and data streams with ease. Comprehensive Android Development: Translate your Kotlin expertise into the realm of Android app development. Learn to build dynamic applications using activities, fragments, ViewModel, and LiveData. Grasp the art and science of Android UI design with Kotlin, exploring layouts, custom views, animations, and the revolutionary Jetpack Compose. Data Management and Networking: G
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TABLE OF CONTENTS The Comprehensive Guide to Kotlin Programming : A Complete Reference Guide Preface Chapter 1: Introduction to Kotlin Chapter 2 : Fundamentals of Kotlin Programming Object-Oriented Programming in Kotlin Chapter 3 : Advanced Kotlin Chapter 4 : Kotlin for Android Development
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P reface Chapter 1: Introduction to Kotlin History of Kotlin Origin and Development by JetBrains Milestones in Kotlin's Evolution Kotlin's Impact on the Android Ecosystem Conciseness and Readability Interoperability with Java Coroutines for Asynchronous Programming Safety Features: Null Safety and Immutability Setting Up Your Development Environment Setting Up Kotlin with Android Studio Kotlin Compiler and Build Tools Integration Understanding the Kotlin Main Function Compilation and Execution Process Compilation Process
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Execution Process Android-Specific Compilation and Execution Understanding Kotlin Syntax and Basics Variables and Type Inference Variables Type Inference Type Inference in Functions Limitations of Type Inference Basic Types and Nullability Basic Types Nullability Comments, Naming Conventions, and Coding Standards Comments Naming Conventions Coding Standards Chapter 2 : Fundamentals of Kotlin Programming
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Basic Syntax and Variables Declaration Initialization Type Inference Var versus Val: Mutable and Immutable Variables String Templates Interpolation Data Types and Operators Primitive Types Reference Types Type Conversion Casting Operators Overloading Control Flow Statements if
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when Loops: for, while, and do-while for while do-while Return Break Continue Arrays and Collections Arrays Navigating the Terrain: Accessing and Iterating Over Arrays Beyond the Basics: Special Considerations Lists Sets Maps Filtering
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Mapping Grouping Mutable vs Immutable Collections Functions and Lambdas Single-Expression Functions Inline Functions Lambda Expressions Anonymous Functions Higher-Order Functions Object-Oriented Programming in Kotlin Classes and Objects Class Declaration Constructors and Initialization Constructors Initialization Blocks Properties and Fields
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Backing Fields Lateinit Delegated Properties Overriding Methods Abstract Classes Visibility Modifiers Public Private Protected Internal Chapter 3 : Advanced Kotlin Generics in Kotlin Generic Classes and Functions Invariance Covariance Understanding Covariance
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Contravariance Type Projections Star Projections Understanding Star Projections Use Cases for Star Projections Delegation and Delegated Properties in Kotlin Class Delegation: The Delegation Pattern Delegated Properties Lazy Initialization with lazy Storing Properties in Maps Extension Functions Extending Class Functionality without Inheritance Extension Properties Null Safety and Exceptions Handling Nullability Explicitly Safe Calls
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Elvis Operator Safe Casts Exception Handling and Try-Catch-Finally Blocks Basic Structure Try-Catch Try as an Expression Finally Block Annotations and Reflection Creating Annotations Reflection: Inspecting and Modifying Classes at Runtime DSL and Inline Functions Domain-Specific Languages: Concept and Implementation Inline Functions: Performance Considerations Coroutines and Asynchronous Programming Suspend Functions Coroutine Context
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Builders launch async withContext Structured Concurrency Coroutine Scope Channels and Shared Mutable State Working with Flows for Reactive Programming Cold Streams with Flow Flow Operators and Backpressure Handling Combining Flows and Lifecycle Awareness Chapter 4 : Kotlin for Android Development Basics of Building Android Apps with Kotlin Activities and Fragments with Kotlin ViewModel LiveData
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Kotlin Coroutines in Android
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Terms and definitions ✓ Kotlin : A statically typed programming language developed by JetBrains, designed to interoperate fully with Java and streamline Android app development. ✓ Coroutines : A concurrency design pattern in Kotlin that simplifies asynchronous programming by turning async callbacks into sequential code. ✓ Jetpack : A suite of libraries, tools, and guidance to help developers follow best practices, reduce boilerplate code, and write code that works consistently across Android versions and devices. ✓ LiveData : A lifecycle-aware observable data holder class that respects the lifecycle of other app components, such as activities, fragments, or services. ✓ ViewModel : Part of Android Architecture Components, designed to store and manage UI-related data in a lifecycle-conscious way, surviving configuration changes. ✓ Dagger/Hilt : A dependency injection library for Android that reduces boilerplate and simplifies accessing shared instances of objects across your app. Hilt is built on top of Dagger to streamline its integration. ✓ Room : An abstraction layer over SQLite, part of Android Jetpack, that allows for more robust database access while harnessing the full power of SQLite.
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✓ Navigation Component : Part of Android Jetpack, it simplifies implementing navigation, from simple button clicks to more complex patterns like app bars and the navigation drawer. ✓ Data Binding : A Jetpack library that allows you to bind UI components in your layouts to data sources in your app using a declarative format rather than programmatically. ✓ Paging Library : Manages data loading in pages, or chunks, from a data source, providing a seamless way to load data on demand within your app's RecyclerView. ✓ WorkManager : A library for managing deferrable, asynchronous tasks that are expected to run even if the app exits or the device restarts. ✓ Extension Functions : A Kotlin feature that allows developers to extend a class with new functionality without having to inherit from the class. ✓ Null Safety : A feature in Kotlin designed to eliminate the risk of null reference exceptions, a common source of runtime errors in many programming languages. ✓ Anko : A Kotlin library (now deprecated) that provided DSLs and helper functions to simplify Android application development. It's notable for its historical significance in promoting Kotlin's adoption. ✓ Compose : Jetpack Compose is a modern toolkit for building native UIs in Kotlin, using a declarative approach, making it easier and quicker to build
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responsive apps. ✓ Flows : In Kotlin, flows are a type that can asynchronously return multiple values sequentially, useful for working with streams of data that produce values over time. ✓ KTX (Kotlin Extensions) : A set of Kotlin extensions that are part of Android Jetpack, designed to write more concise, idiomatic Kotlin code. ✓ Suspend Functions : Functions in Kotlin that can be paused and resumed at a later time, allowing them to perform long-running operations without blocking. ✓ Fragment : A reusable portion of your app's UI, a segment of the user interface or behavior that can be placed in an Activity. ✓ Gradle : The build system used in Android development, which automates the process of compiling, testing, and packaging Android apps, supporting both Kotlin and Java. ✓ Interface : In Kotlin, an interface is a definition of a contract that classes can implement. Interfaces can contain abstract methods and property declarations, but no state. ✓ Object Declaration : Kotlin's way to declare a singleton directly in the language, ensuring a class has only one instance in the application.
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✓ Companion Object : A singleton object within a class that allows access to factory methods and properties, similar to static methods in Java, directly associated with the class itself rather than instances of it. ✓ Sealed Class : A type of class in Kotlin used for representing restricted class hierarchies, where a value can have one of the types from a limited set, but cannot have any other type. ✓ Data Class : In Kotlin, a class designed to hold data. The compiler automatically generates equals(), hashCode(), toString(), and copy() methods for data classes. ✓ Inline Functions : Functions marked with the inline keyword in Kotlin, which requests the compiler to copy the function's bytecode into the call site, reducing the overhead of calling a function. ✓ Higher-Order Functions : Functions that take functions as parameters or return a function. These are a key part of Kotlin's support for functional programming. ✓ Lambda Expressions : A concise way to represent function literals in Kotlin, allowing functions to be passed as arguments, returned as values, or stored in variables. ✓ Scope Functions : In Kotlin, functions like apply , let , run , with , and also that execute a block of code within the context of an object.
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✓ Delegated Properties : Kotlin feature that allows certain common kinds of property implementations to be delegated to another object, such as lazy properties, observable properties, or storing properties in a map. ✓ Lazy Initialization : A pattern in Kotlin used to delay the initialization of an object until the point at which it is accessed for the first time. ✓ Coroutines Scope : Defines the scope in which coroutines run, determining the lifecycle of the coroutines. Common examples are viewModelScope for ViewModels and lifecycleScope for activities and fragments. ✓ Reified Type Parameters : In Kotlin, inline functions support reified type parameters, allowing you to access the type passed as a parameter at runtime. ✓ Type Alias : Provides the ability to create an alternative name for an existing type, improving code readability without introducing a new type. ✓ Destructuring Declarations : Syntax in Kotlin that allows you to unpack a single composite data object into multiple variables. ✓ Extension Properties : Similar to extension functions, these allow adding new properties to existing classes from outside the class. ✓ Collection Filtering : Kotlin provides a rich set of functions to manipulate collections, allowing easy filtering and transformation of data sets. ✓ Null Coalescing Operator ( ?: ) : The Elvis operator in Kotlin, used to provide a default value in case an expression resolves to null , streamlining
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null-check operations. ✓ Smart Casts : The Kotlin compiler tracks conditions inside if expressions that check for types, and automatically casts types if possible, reducing the need for explicit casting. ✓ Lateinit : Keyword in Kotlin that allows you to declare non-nullable properties without initializing them at the point of construction, intended for cases where the property will be initialized later. ✓ Flow : A type in Kotlin Coroutines that represents a cold asynchronous data stream, supporting reactive programming patterns within the Kotlin ecosystem. ✓ StateFlow : A state-holder observable flow that emits the current and new state updates to its collectors, part of Kotlin Coroutines for representing a state in a lifecycle-aware manner. ✓ SharedFlow : A hot flow that emits values to all consumers that collect from it, allowing for more dynamic and flexible event distribution within an application. ✓ Channel : A non-blocking primitive from Kotlin Coroutines that represents a data stream, similar to BlockingQueue but without blocking operations, for communication between coroutines. ✓ Suspend Modifier : A Kotlin keyword that indicates a function is a suspending function, which can be paused and resumed at a later time,
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enabling non-blocking asynchronous operations. ✓ ViewModelScope : An extension property added to ViewModel by the Lifecycle KTX library, creating a CoroutineScope tied to the ViewModel lifecycle for launching coroutines. ✓ LifecycleScope : Provided by the Lifecycle KTX library, it's a CoroutineScope tied to the Lifecycle object, automatically canceled when the Lifecycle is destroyed. ✓ Binding Adapters : Part of the Data Binding library, allowing you to create custom attributes for XML layout files and define how these attributes are set with custom logic. ✓ ConstraintLayout : A flexible layout manager for Android that allows you to create complex UIs with flat view hierarchies; it's optimized for large and complex layouts. ✓ LiveData Transformation : Operations that allow you to apply transformations to LiveData objects, such as map and switchMap , to create new LiveData instances reflecting the changed data. ✓ Repository Pattern : An architectural pattern that provides a clean API for data access to the rest of the application, serving as a mediation layer between different data sources. ✓ DiffUtil : A utility class that calculates the difference between two lists and outputs a list of update operations that converts the first list into the second
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