Show Download Progress in Kotlin Style

Show Download Progress in Kotlin Style

Ktor, Sealed Classes, Extensions and Flow

Introduction

Before diving into the process, let me tell you what we’re going to use. If you’re unfamiliar with any of these things, I’ll leave a link below them for a detailed explanation. I highly recommend having a basic knowledge of these concepts before going any further.

Ktor

We’re using the Ktor Android client for networking purposes. Ktor is an open source framework for building asynchronous servers and clients in connected systems using the powerful Kotlin programming language. It runs on coroutines and is made by JetBrains.

How to Use Ktor in Your Android App

Learn all about this Kotlin-native networking library

medium.com

Sealed classes

We’re using sealed classes as an effective state management tool. Per AndroidStudy,

“A sealed class allows you to represent constrained hierarchies in which an object can only be of one of the given types.”

That means we have a class with a specific number of subclasses. What we have in the end is very similar to an enum. The difference is that we only have one object per class in the enum, while in the sealed classes, we can have several objects of the same class. This difference will allow objects from a sealed class to keep state. AndroidStudy.com

How to Use Kotlin Sealed Classes for State Management

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