Hey there, let's dig into why your rounded corners are acting up inconsistently with Glide v4. I've run into similar quirks before, so here are the most likely culprits and fixes to try:

1. You're Using DP Instead of Pixels for Radius #

Glide's RoundedCorners constructor expects pixel values, not DP. If you're passing 30 thinking it's DP, the actual radius will be tiny on high-density screens (or way too big on low-res ones), making it look like the effect isn't working.

Fix this by converting your DP value to pixels first:

val photoCornerRadiusDp = 30
val photoCornerRadiusPx = (photoCornerRadiusDp * context.resources.displayMetrics.density).toInt()

Use photoCornerRadiusPx in your RoundedCorners call instead.

2. Glide's Cache Is Serving Old, Unrounded Images #

Glide caches images aggressively. If you previously loaded the same image without the rounded corner transformation, the cached version might be served instead of the new transformed one.

Force Glide to treat the rounded version as a separate cache entry by adding a signature:

GlideApp.with(context)
    .load(postDetail.postImageUrls[i])
    .signature(ObjectKey("rounded_$photoCornerRadiusPx")) // Unique key for this transformation
    .transform(MultiTransformation(CenterCrop(), RoundedCorners(photoCornerRadiusPx)))
    .placeholder(R.drawable.ic_image)
    .error(R.drawable.ic_image_broken)
    .into(ivPhoto[i])

The signature ensures any change to the radius (or transformation) will trigger a fresh load.

3. Your ImageView's ScaleType Is Conflicting #

If your ImageView has a scaleType set in XML (like fitXY or fitCenter), it can override Glide's CenterCrop transformation, breaking the rounded corners.

Fix this by:

• Removing the scaleType attribute from your ImageView XML, or
• Setting it to centerCrop to match Glide's transformation:

<ImageView
    android:id="@+id/ivPhoto"
    ...
    android:scaleType="centerCrop" />

4. ImageView Background/Padding Is Covering the Corners #

If your ImageView has a solid background color or padding that's larger than the corner radius, the rounded edges might be hidden beneath it.

Check your XML layout:

• Make sure the ImageView's background is transparent (or matches your parent background)
• Ensure padding isn't pushing the image away from the edges where the corners would show

5. Outdated Glide Version #

Older versions of Glide v4 had bugs with RoundedCorners (especially when combined with MultiTransformation). Head to your build.gradle file and make sure you're using the latest stable Glide version.

For example, in your app-level build.gradle:

implementation 'com.github.bumptech.glide:glide:4.16.0'
kapt 'com.github.bumptech.glide:compiler:4.16.0'

Quick Test to Isolate the Issue #

To narrow down the problem, try loading a single image with just the RoundedCorners transformation (without CenterCrop) and see if it works. If it does, the conflict is likely with the scale type or multi-transformation order.

内容的提问来源于stack exchange，提问作者zihadrizkyef