"How to obtain the number of images loaded successfully from a list using GlideImage?"

Question

I have a list of strings where I store network images that I later iterate through within a forEach loop, and within it, I have the GlideImage composable that allows me to determine if the image was loaded correctly. However, when I add a variable to track how many images were loaded correctly, the counter never stops.

fun ImageLoader() {
    val urls = listOf(
        "https://www.example.com/image1.jpg",
        "https://www.example.com/image2.jpg",
        "https://www.example.com/image3.jpg",
        "https://www.example.com/image1.jpg",
    )
    val successfulImageCount = remember { mutableStateOf(0) }

    Column(modifier = Modifier.fillMaxSize()) {
        urls.forEach { url ->
            GlideImage(
                imageModel = { url },
                success = { status: GlideImageState.Success, image: Painter ->
                    successfulImageCount.value++
                    Image(painter = image, contentDescription = "")
                },
                modifier = Modifier.size(80.dp),
            )
        }

        Text(text = "Images uploaded correctly: ${successfulImageCount.value}")
    }
}

Updating the counter causes ImageLoader to recompose, which cause GlideImage to recompose, which update the counter again, looping infinitely. — Ricky Mo
– Ricky Mo, Commented May 2, 2024 at 4:41

D.Sanxhez · Accepted Answer · 2024-05-02 05:23:37Z

To fix the issue where updating the counter causes the ImageLoader to recompose, which in turn recomposes GlideImage, updating the counter again and causing an infinite loop, you can use a side effect to update the counter only once per image load. Here's how you can do it:

@Composable
fun ImageLoader() {
    val urls = listOf(
        "https://www.example.com/image1.jpg",
        "https://www.example.com/image2.jpg",
        "https://www.example.com/image3.jpg",
        "https://www.example.com/image1.jpg",
    )
    val successfulImageCount = remember { mutableStateOf(0) }

    Column(modifier = Modifier.fillMaxSize()) {
        urls.forEach { url ->
            GlideImage(
                imageModel = { url },
                success = { status: GlideImageState.Success, image: Painter ->
                    // Use a side-effect to increment the counter only once per image load
                    DisposableEffect(key1 = url) {
                        successfulImageCount.value++
                        onDispose { }
                    }
                    Image(painter = image, contentDescription = "")
                },
                modifier = Modifier.size(80.dp),
            )
        }

        Text(text = "Images uploaded correctly: ${successfulImageCount.value}")
    }
}

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