A modern image loading library for Android powered by Kotlin Coroutines.
Apache-2.0KotlinCompose
Quick Start
Setup Steps
- Add the dependency to your build.gradle.kts or build.gradle file.
- Initialize Coil in your Application class if needed (optional for basic usage).
- Use the load() extension function on ImageView or AsyncImage in Compose to load images.
Overview
Coil is an image loading library for Android that is fast, lightweight, and easy to use. It leverages Kotlin Coroutines for asynchronous loading and provides a simple API for loading images into ImageViews, Jetpack Compose, and more.
Features
✓Fast and efficient image loading with memory and disk caching.
✓Support for various image formats including JPEG, PNG, GIF, and SVG.
✓Image transformations such as circle crop, rounded corners, and blur.
✓Seamless integration with Jetpack Compose via the coil-compose module.
✓Lifecycle-aware to prevent memory leaks.
Use Cases
●Loading profile pictures or product images from URLs in social media apps.
●Displaying images in a list or grid, such as in an image gallery or e-commerce product listing.
●Handling image loading in background with automatic cancellation on view detachment.
When Not to Use
✗Real-time image processing or heavy filtering that requires custom image pipelines.
✗Loading images in non-Android projects without Kotlin Multiplatform support.
✗Situations where minimal library size is critical and a simpler solution suffices.
Usage Examples
Load Image into ImageView
imageView.load("https://example.com/image.jpg")Basic usage to load an image from a network URL.
Use with Jetpack Compose
AsyncImage(model = "https://example.com/image.jpg", contentDescription = "Image")Load images in a Compose UI using the AsyncImage composable.
Common Pitfalls
- Ensure INTERNET permission is added in AndroidManifest.xml for network images.
- Handle loading errors and placeholders to improve user experience.
- Be cautious with large images or multiple simultaneous loads to avoid memory issues.
Integration
Works well with
Retrofit for fetching image URLs from APIs.Room for storing and retrieving image metadata.Hilt or Dagger for dependency injection in complex setups.
- Coil automatically integrates with AndroidX Lifecycle to scope image loading to the lifecycle of the component.
Alternatives
Glide
More mature with extensive features and community, but has a larger footprint.
Picasso
Simpler API and easier to set up, but less performant for advanced use cases.
Fresco
Facebook's library with advanced memory management, but more complex to integrate.