Jetpack Compose image loading library which can fetch and display network images using Glide, Coil, and Fresco

by androidexample

Landscapist

?
Jetpack Compose image loading library which can fetch and display network images using Glide, Coil, Fresco

Usecase

You can see the use cases of this library in the below repositories.

  • DisneyCompose –
    ?
    A demo Disney app using Jetpack Compose and Hilt based on modern Android tech-stacks and MVVM architecture.

Glide

Add below codes to your root build.gradle file (not your module build.gradle file).

allprojects {
    repositories {
        mavenCentral()
    }
}

And add a dependency code to your module‘s build.gradle file.

dependencies {
    implementation "com.github.skydoves:landscapist-glide:1.1.7"
}

Usage

We can request and load images simply using a GlideImage composable function.

GlideImage(
  imageModel = imageUrl,
  // Crop, Fit, Inside, FillHeight, FillWidth, None
  contentScale = ContentScale.Crop,
  // shows an image with a circular revealed animation.
  circularRevealedEnabled = true,
  // shows a placeholder ImageBitmap when loading.
  placeHolder = ImageBitmap.imageResource(R.drawable.placeholder),
  // shows an error ImageBitmap when the request failed.
  error = ImageBitmap.imageResource(R.drawable.error)
)

RequestOptions and TransitionOptions

We can customize our request options using RequestOptions and TransitionOptions for applying caching strategies, loading transformations.

GlideImage(
  imageModel = poster.poster,
  requestOptions = RequestOptions()
    .override(256, 256)
    .diskCacheStrategy(DiskCacheStrategy.ALL)
    .centerCrop(),
  transitionOptions = BitmapTransitionOptions.withCrossFade(), 
  contentScale = ContentScale.Crop,
  modifier = modifier,
  alignment = Alignment.Center,
)

RequestBuilder

Also we can request image by passing a RequestBuilder. RequestBuilder is the backbone of the request in Glide and is responsible for bringing your options together with your requested url or model to start a new load.

GlideImage(
  imageModel = poster.poster,
  requestBuilder = Glide
    .with(LocalView.current)
    .asBitmap()
    .apply(RequestOptions().diskCacheStrategy(DiskCacheStrategy.ALL))
    .thumbnail(0.1f)
    .transition(withCrossFade()),
  modifier = Modifier.constrainAs(image) {
    centerHorizontallyTo(parent)
    top.linkTo(parent.top)
  }.aspectRatio(0.8f)
)

LocalGlideRequestBuilder

We can provide the same instance of the RequestBuilder in the composable hierarchy.

// customize the RequestBuilder as needed
val requestBuilder = Glide.with(LocalView.current)
  .asBitmap()
  .thumbnail(0.1f)
  .transition(BitmapTransitionOptions.withCrossFade())

CompositionLocalProvider(LocalGlideRequestBuilder provides requestBuilder) {
  // This will automatically use the value of current RequestBuilder in the hierarchy.
  GlideImage(
    imageModel = ...
  )
}

Composable loading, success, failure

We can create our own composable functions following requesting states.
Here is an example that shows a progress indicator when loading an image,
After complete requesting, the indicator will be gone and a content image will be shown.
And if the request failed (e.g. network error, wrong destination), error text will be shown.

 GlideImage(
 imageModel = poster.poster,
 modifier = modifier,
 // shows a progress indicator when loading an image.
 loading = {
   ConstraintLayout(
     modifier = Modifier.fillMaxSize()
   ) {
     val indicator = createRef()
     CircularProgressIndicator(
       modifier = Modifier.constrainAs(indicator) {
         top.linkTo(parent.top)
         bottom.linkTo(parent.bottom)
        start.linkTo(parent.start)
        end.linkTo(parent.end)
       }
     )
   }
 },
 // shows an error text message when request failed.
 failure = {
   Text(text = "image request failed.")
 })

Coil


And add a dependency code to your module‘s build.gradle file.

dependencies {
    implementation "com.github.skydoves:landscapist-coil:<version>"
}

Usage

We can request and load images simply using a CoilImage composable function.

CoilImage(
  imageModel = imageUrl,
  // Crop, Fit, Inside, FillHeight, FillWidth, None
  contentScale = ContentScale.Crop,
  // shows an image with a circular revealed animation.
  circularRevealedEnabled = true,
  // shows a placeholder ImageBitmap when loading.
  placeHolder = ImageBitmap.imageResource(R.drawable.placeholder),
  // shows an error ImageBitmap when the request failed.
  error = ImageBitmap.imageResource(R.drawable.error)
)

ImageRequest and ImageLoader

We can customize request options using ImageRequest and ImageLoader for providing all the necessary information for loading images like caching strategies and transformations.

CoilImage(
  imageRequest = ImageRequest.Builder(LocalContext.current)
    .data(poster.poster)
    .crossfade(true)
    .build(),
  imageLoader = ImageLoader.Builder(LocalContext.current)
    .availableMemoryPercentage(0.25)
    .crossfade(true)
    .build(),
  contentScale = ContentScale.Crop,
  modifier = modifier,
  alignment = Alignment.Center,
)

Composable loading, success, failure

We can create our own composable functions following requesting states. Here is an example that shows a progress indicator when loading an image, After complete requesting, the indicator will be gone and a content image will be shown. And if the request failed (e.g. network error, wrong destination), error text will be shown.

CoilImage(
  imageModel = poster.poster,
  modifier = Modifier.constrainAs(image) {
    centerHorizontallyTo(parent)
    top.linkTo(parent.top)
  }.aspectRatio(0.8f),
  // shows a progress indicator when loading an image.
  loading = {
    ConstraintLayout(
      modifier = Modifier.fillMaxSize()
    ) {
      val indicator = createRef()
      CircularProgressIndicator(
        modifier = Modifier.constrainAs(indicator) {
          top.linkTo(parent.top)
          bottom.linkTo(parent.bottom)
          start.linkTo(parent.start)
          end.linkTo(parent.end)
        }
      )
    }
  },
  // shows an error text message when request failed.
  failure = {
    Text(text = "image request failed.")
  })

Shimmer effect

We can give a shimmering effect when loading images using a ShimmerParams. We can also use ShimmerParams in GlideImage and FrescoImage.

 CoilImage(
 imageModel = poster.poster,
 modifier = modifier,
 // shows a shimmering effect when loading an image.
 shimmerParams = ShimmerParams(
        baseColor = MaterialTheme.colors.background,
        highlightColor = shimmerHighLight,
        durationMillis = 350,
        dropOff = 0.65f,
        tilt = 20f
      ),
 // shows an error text message when request failed.
 failure = {
   Text(text = "image request failed.")
 })

LocalCoilImageLoader

We can provide the same instance of the ImageLoader in the composable hierarchy.

val imageLoader = ImageLoader.Builder(context)
   // customize the ImageLoader as needed
   .build()
CompositionLocalProvider(LocalCoilImageLoader provides imageLoader) {
  // This will automatically use the value of current imageLoader in the hierarchy.
  CoilImage(
    imageModel = ...
  )
}

Fresco


And add a dependency code to your module‘s build.gradle file.

dependencies {
    implementation "com.github.skydoves:landscapist-fresco:<version>"
}

Initialize

We should initialize Fresco using ImagePipelineConfig in our Application class.
If we need to fetch images from the network, recommend using OkHttpImagePipelineConfigFactory.
By using an ImagePipelineConfig, we can customize caching, networking, and thread pool strategies.
Here are more references related to the pipeline config.

class App : Application() {

  override fun onCreate() {
    super.onCreate()

    val pipelineConfig =
      OkHttpImagePipelineConfigFactory
        .newBuilder(this, OkHttpClient.Builder().build())
        .setDiskCacheEnabled(true)
        .setDownsampleEnabled(true)
        .setResizeAndRotateEnabledForNetwork(true)
        .build()

    Fresco.initialize(this, pipelineConfig)
  }
}

Usage

We can request and load images simply using a FrescoImage composable function.

FrescoImage(
  imageUrl = stringImageUrl,
  // Crop, Fit, Inside, FillHeight, FillWidth, None
  contentScale = ContentScale.Crop,
  // shows an image with a circular revealed animation.
  circularRevealedEnabled = true,
  // shows a placeholder ImageBitmap when loading.
  placeHolder = ImageBitmap.imageResource(R.drawable.placeholder),
  // shows an error ImageBitmap when the request failed.
  error = ImageBitmap.imageResource(R.drawable.error)
)

We can customize our requests using an ImageRequest that consists only of a URI, we can use the helper method ImageRequest.fromURI.

val imageRequest = ImageRequestBuilder
  .newBuilderWithSource(uri)
  .setImageDecodeOptions(decodeOptions)
  .setLocalThumbnailPreviewsEnabled(true)
  .setLowestPermittedRequestLevel(RequestLevel.FULL_FETCH)
  .setProgressiveRenderingEnabled(false)
  .setResizeOptions(ResizeOptions(width, height))
  .build()

FrescoImage(
  imageUrl = stringImageUrl,
  imageRequest = imageRequest,
  contentScale = ContentScale.Crop)

Composable loading, success, failure

We can create our own composable functions following requesting states.
Here is an example that shows a progress indicator when loading an image,
After complete requesting, the indicator will be gone and a content image will be shown.
And if the request failed (e.g. network error, wrong destination), error text will be shown.

 FrescoImage(
 imageUrl = stringImageUrl,
 modifier = modifier,
 // shows a progress indicator when loading an image.
 loading = {
   ConstraintLayout(
     modifier = Modifier.fillMaxSize()
   ) {
     val indicator = createRef()
     CircularProgressIndicator(
       modifier = Modifier.constrainAs(indicator) {
         top.linkTo(parent.top)
         bottom.linkTo(parent.bottom)
        start.linkTo(parent.start)
        end.linkTo(parent.end)
       }
     )
   }
 },
 // shows an error text message when request failed.
 failure = {
   Text(text = "image request failed.")
 })

Also, we can customize the content image using our own composable function like below.

FrescoImage(
    imageUrl = imageUrl,
    // draw a resized image.
    success = { frescoImageState ->
      frescoImageState.imageBitmap?.let {
        Image(
          asset = it,
          modifier = Modifier
            .width(128.dp)
            .height(128.dp))
      }
    },
    loading = { 
      // do something 
    })

LocalFrescoImageRequest

We can provide the same instance of the ImageRequest in the composable hierarchy.

// customize the ImageRequest as needed
val imageRequest = ImageRequestBuilder
  .newBuilderWithSource(uri)
  .setImageDecodeOptions(decodeOptions)
  .setLocalThumbnailPreviewsEnabled(true)
  .setLowestPermittedRequestLevel(RequestLevel.FULL_FETCH)
  .setProgressiveRenderingEnabled(false)
  .setResizeOptions(ResizeOptions(width, height))
  .build()

CompositionLocalProvider(LocalFrescoImageRequest provides imageRequest) {
  // This will automatically use the value of current ImageRequest in the hierarchy.
  FrescoImage(
    imageurl = ...
  )
}

Reference repository

This library is mostly inspired by Accompanist.

Accompanist is a group of libraries that contains some utilities which I’ve found myself copying around projects which use Jetpack Compose. Currently, it contains image loading and insets. You can get more variety and recent systems from the library maintained by Google.

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License

Designed and developed by 2020 skydoves (Jaewoong Eum)

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

   http://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.

GitHub

https://github.com/skydoves/landscapist