Download an image to local disk and show it with Compose.

 

class DownloadImageUseCase @Inject constructor(
    @ApplicationContext private val context: Context,
    private val dispatchersProvider: DispatchersProvider,
) {
    suspend operator fun invoke(imageUrl: String): String? = withContext(dispatchersProvider.io()) {
        try {
            val input = URL(imageUrl).openStream()
            val fileName = imageUrl.substringAfterLast("/")
            val file = File(context.filesDir, fileName)
            FileOutputStream(file).use { output ->
                input.copyTo(output)
            }
            file.absolutePath
        } catch (e: Exception) {
            e.printStackTrace()
            null
        }
    }
}

viewModelScope.launch {
    state.update { oldState ->
        oldState.copy(
            imagePath =
            downloadImageUseCase(
                "https://apod.nasa.gov/apod/image/2403/IM_Odysseus_landing-1100x600.png",
            ),
        )
    }
}

@Composable
fun DisplayImageFromDisk(imagePath: String?) {
    imagePath?.let {
        Image(
            painter = rememberAsyncImagePainter(File(it)),
            contentDescription = "Cached Image",
            modifier = Modifier.fillMaxWidth()
        )
    }
}