An android app built using Kotlin that consumes Pixabay API to display images and their details. It has been built following Clean Architecture Principle, MVVM Architecture and Jetpack components.
Download the apk here
Clean Architecture combines a group of practices that produce systems with the following characteristics:
- Testable.
- UI-independent (the UI can easily be changed without changing the system).
- Independent of databases, frameworks, external agencies, and libraries.
The following scheme presents the architecture from the UI to the backend or database:
As you can see in the image, an Android application with Clean Architecture gathers the layers into three modules:
-
Presentation - presents data to a screen and handle user interactions.
- Components:
- Activities/ Fragments
- ViewModels
- Components:
-
Domain - which contains business logic
- Components:
- Models (Entities)
- Usecases
- Repositories Implementation
- Components:
-
Data - which manages application data eg. retrieve data from the network, manage data cache.
- Components:
- Local data sources
- Remote data sources
- Repositories Interfaces
- Components:
- Kotlin - Kotlin is a programming language that can run on JVM. Google has announced Kotlin as one of its officially supported programming languages in Android Studio; and the Android community is migrating at a pace from Java to Kotlin
- Lifecycle - Perform actions in response to a change in the lifecycle status of another component, such as activities and fragments.
- Viewmodel -The ViewModel class is designed to store and manage UI-related data in a lifecycle conscious way
- LiveData - A lifecycle-aware data holder with the observer pattern
- Kotlin Coroutines - A concurrency design pattern that you can use on Android to simplify code that executes asynchronously.
- Room Database - The Room persistence library provides an abstraction layer over SQLite to allow fluent database access while harnessing the full power of SQLite
- View Binding - Allows you to bind UI components in your layouts to data sources in your app using a declarative format rather than programmatically.
- Retrofit - Retrofit is a REST Client for Java and Android by Square inc under Apache 2.0 license. Its a simple network library that used for network transactions. By using this library we can seamlessly capture JSON response from web service/web API.
- GSON - JSON Parser,used to parse requests on the data layer for Entities and understands Kotlin non-nullable and default parameters.
- Flow - In coroutines, a flow is a type that can emit multiple values sequentially, as opposed to suspend functions that return only a single value.
- Hilt - A dependency injection library for Android that reduces the boilerplate of doing manual dependency injection in your project
- Navigation Components - Helps you implement navigation, from simple button clicks to more complex patterns, such as app bars and the navigation drawer.
- Logging Interceptor - logs HTTP request and response data.
- Material Libarary - Modular and customizable Material Design UI components for Android
- Glide- An image loading and caching library for Android focused on smooth scrolling.
- SavedStateHandle - Getting results from a destination when navigating from one fragment to another.
- MockWebServer - A mock web server is a program that mocks the behavior of an actual remote server but doesn’t make calls over the internet.
- JUnit - JUnit is a simple framework to write repeatable tests. It is an instance of the xUnit architecture for unit testing frameworks.
- Espresso - write concise, beautiful, and reliable Android UI tests.
Sign up for the API key on the following Link https://pixabay.com/api/docs/#api_search_images
These are the app's screenshots:
