Overview

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, 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.

Translations: 한국어, 中文, Türkçe, 日本語

Download¶

Coil is available on mavenCentral().

implementation("io.coil-kt:coil:2.4.0")

Quick Start¶

ImageViews¶

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

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

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

// And more...

Requests can be configured with an optional trailing lambda:

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

Jetpack Compose¶

Import the Jetpack Compose extension library:

implementation("io.coil-kt:coil-compose:2.4.0")

To load an image, use the AsyncImage composable:

AsyncImage(
    model = "https://example.com/image.jpg",
    contentDescription = null,
)

Image Loaders¶

Both imageView.load and AsyncImage use the singleton ImageLoader to execute image requests. The singleton ImageLoader can be accessed using a Context extension function:

val imageLoader = context.imageLoader

ImageLoaders are designed to be shareable and are most efficient when you create a single instance and share it throughout your app. That said, you can also create your own ImageLoader instance(s):

val imageLoader = ImageLoader(context)

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

Requests¶

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

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

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 and OkHttp.

License¶

Copyright 2023 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.