Chinese guide to accompanist component library - glide, hot

️ tip ： If not necessary , It is recommended to use Coil. Coil Is based on Kotlin The realization of coprocessing , This means that it can better communicate with Jetpack Compose Integrate , Because the latter also uses a lot of CO processes .

rememberGlidePainter()

The main API rememberGlidePainter() The simplest use of is as follows ：

import androidx.compose.foundation.Image
import com.google.accompanist.glide.rememberGlidePainter

Image(
painter = rememberGlidePainter(
request = “https://picsum.photos/300/300”,
previewPlaceholder = R.drawable.placeholder
),
contentDescription = stringResource(R.string.image_content_desc)
)

painter Use Glide Load incoming data , Then draw the resulting image .

Developers can also use requestBuilder Parameters are self-defined Glide Of RequestBuilder.

Fade in animation

The library supports fade in animation during image loading .

rememberGlidePainter The function parameter of fadeIn:Boolean The default is false, When fadeIn = true when , A default fade in animation will appear during the successful loading of the picture .

import androidx.compose.foundation.Image
import com.google.accompanist.glide.rememberGlidePainter

Image(
painter = rememberGlidePainter(
“https://picsum.photos/300/300”,
fadeIn = true
),
contentDescription = stringResource(R.string.image_content_desc),
)

Custom content

Sometimes a developer may want to display a placeholder image when the image is loaded or a failure prompt image when the image fails to load ,rememberGlidePainter() Back to painter It's a LoadPainter example ,ImageLoadState There are four states ：Empty、Loading、Success and Error, Respectively corresponding to the initial state 、 Loading state 、 Load success and load failure . Developers can display different content as needed ：

val painter = rememberGlidePainter(“https://picsum.photos/300/300”)
Box {
Image(
painter = painter,
contentDescription = stringResource(R.string.image_content_desc),
)

when (painter.loadState) {
is ImageLoadState.Loading -> {
// Display a circular progress indicator whilst loading
CircularProgressIndicator(Modifier.align(Alignment.Center))
}
is ImageLoadState.Error -> {
// If you wish to display s

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ome content if the request fails
}
}
}

preview

For support Android Studio Of Composable Previews function , Developers can use previewPlaceholder Parameter to pass in a picture resource ID , In order to Android Studio Preview the layout with pictures ：

Image(
painter = rememberGlidePainter(
request = “https://picsum.photos/300/300”,
previewPlaceholder = R.drawable.placeholder,
),
contentDescription = stringResource(R.string.image_content_desc),
)

If you quote drawable Only used for previewPlaceholder, You can place it in debug Resources for building variants , for example ：app/debug/res/drawable/, This operation will drawable Bundled in the debug version , It is also excluded from the release .

GIF

Accompanist Glide adopt Glide built-in GIF Support the implementation of GIF Image loading . The default support , No additional configuration is required .

Observe the change of loading state

Developers can use snapshotFlow() To observe painter.loadState The change of , In order to realize the monitoring of picture loading status , Then adjust the code logic as needed ：

val painter = rememberGlidePainter(“https://image.url”)

LaunchedEffect(painter) {
snapshotFlow { painter.loadState }
.filter { it.isFinalState() }
.collect { result ->
// TODO do something with result
}
}
low { painter.loadState }
.filter { it.isFinalState() }
.collect { result ->
// TODO do something with result
}
}