coil-kt / Coil

An image loading library for Android backed by Kotlin Coroutines. Coil is:

• Fast: Coil performs a number of optimizations including memory and disk caching, downsampling the image in memory, re-using bitmaps, automatically pausing/cancelling requests, and more.
• Lightweight: Coil adds ~2000 methods to your APK (for apps that already use OkHttp and Coroutines), which is comparable to Picasso and significantly less than Glide and Fresco.
• Easy to use: Coil's API leverages Kotlin's language features for simplicity and minimal boilerplate.
• Modern: Coil is Kotlin-first and uses modern libraries including Coroutines, OkHttp, Okio, and AndroidX Lifecycles.

Coil is an acronym for: Coroutine Image Loader.

Made with ❤️ at Instacart. Translations: 한국어, 中文, Türkçe

Download

Coil is available on mavenCentral().

implementation("io.coil-kt:coil:1.4.0")

Quick Start

To load an image into an ImageView, use the load extension function:

// URL
imageView.load("https://www.example.com/image.jpg")

// Resource
imageView.load(R.drawable.image)

// File
imageView.load(File("/path/to/image.jpg"))

// And more...

Requests can be configured with an optional trailing lambda:

imageView.load("https://www.example.com/image.jpg") {
    crossfade(true)
    placeholder(R.drawable.image)
    transformations(CircleCropTransformation())
}

Image Loaders

imageView.load uses the singleton ImageLoader to enqueue an ImageRequest. The singleton ImageLoader can be accessed using an extension function:

val imageLoader = context.imageLoader

Optionally, you can create your own ImageLoader instance(s) and inject them with dependency injection:

val imageLoader = ImageLoader(context)

If you do not want the singleton ImageLoader, depend on io.coil-kt:coil-base.

Requests

To load an image into a custom target, enqueue an ImageRequest:

val request = ImageRequest.Builder(context)
    .data("https://www.example.com/image.jpg")
    .target { drawable ->
        // Handle the result.
    }
    .build()
val disposable = imageLoader.enqueue(request)

To load an image imperatively, execute an ImageRequest:

val request = ImageRequest.Builder(context)
    .data("https://www.example.com/image.jpg")
    .build()
val drawable = imageLoader.execute(request).drawable

Check out Coil's full documentation here.

Requirements

• AndroidX
• Min SDK 14+
• Java 8+

R8 / Proguard

Coil is fully compatible with R8 out of the box and doesn't require adding any extra rules.

If you use Proguard, you may need to add rules for Coroutines, OkHttp and Okio.

License

Copyright 2021 Coil Contributors

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.