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Blur disappears when navigating away from and back to view in 1.6.3

See original GitHub issue

Please include:

  1. Library version: 1.6.3. Issue not present in 1.6.2.
  2. Device and OS version: Android Oreo
  3. Detailed steps to reproduce the issue: Create a BlurView, navigate away from the screen and back to it again, blur disappears.

Hi, this lib is still unmatched imo so thank you. I just thought you’d like to know, I have a very basic implementation of a BlurView that mistakenly clears itself if you navigate away from the screen with the view and come back to it. The issue is not there in 1.6.2 and below:


            binding.welcomeTitleBlurView.outlineProvider = ViewOutlineProvider.BACKGROUND
            binding.welcomeTitleBlurView.clipToOutline = true

I am blurring in a Fragment’s onCreateView. I noticed if I add a delay of 100ms it successfully blurs when it navigates back, and just in case I made sure to try and perform the blur after it has been laid out using:

    inline fun View.afterMeasured(crossinline f: View.() -> Unit) {
        viewTreeObserver.addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener {
            override fun onGlobalLayout() {
                if (measuredWidth > 0 && measuredHeight > 0) {

So something has changed regarding lifecycle callbacks, or threading or something, not sure which.

Also, I noticed the blurring algorithm seems to stretch or magnify the blurred image differently in the setup I have in 1.6.2 / 1.6.3, whereas from 1.5.0->1.6.1 it is different. My view happens to be a relatively narrow, long view on a 7 inch landscape screen. I think 1.6.1 looks more accurate and doesn’t exhibit the disappearing blur behavior in 1.6.3, so will stick with that for the moment.

Here is 1.6.1 with a blur radius of 2: image

Here is 1.6.2 with a blur radius of 2: image

1.6.2 with an increased blur radius of 8 is better: image

Issue Analytics

  • State:closed
  • Created 3 years ago
  • Comments:10 (10 by maintainers)

github_iconTop GitHub Comments

Dimeziscommented, Nov 2, 2020

Honestly, I got too lazy to get it fixed without any hacks, so if that’s working for you, let it stay for now 😃

Dimeziscommented, Jul 6, 2020

Thank you for the detailed report. As for the disappearing blur, I guess it’s related to this There was a small change, posting of some callbacks was removed, and seems like it introduced this bug instead. That’s why your postponing workaround seems to fix it.

Regarding the stretching, I believe it’s related to a change in, I’ve increased the rounding value to 64 to significantly improve the performance on Samsung devices. But apparently I forgot to scale the Y dimension accordingly.

Both should be fixable, but can’t say for sure when I’ll be able to do it

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