pressing back doesn't close the app.
I have to use the back gesture twice to do so.

using it once just displays the last image viewed (which I'd already closed with the back gesture before)

A basic function to view next and previous image will make viewing more convenient.

Setup github actions

• Build
• Unit Tests
• Instrumented Tests

After discovering your project, I shared the repo in JPEG XL Discord. Members reported that the app works very well.

I would also like to try the app, but I couldn't as my devices are ARMv7 while the APK is for ARM64. Can you please build the app for ARMv7?

Thank you very much for making jxlviewer - it is amazing as there are only very few Android apps which can open JXL files.

Example :

• Size
• Number of frames
• Color Space
• Time to load

I just saw that the APKs at both releases have the same versionCode (1). As this is what Android uses internally to tell versions apart, could you please increase it with each release?

While on it: Is there somewhere a more detailed description and ideally also some screenshots? Reading in other issues here the app is working well and used, I was thinking about adding it to my repo, so that would really help. Thanks in advance!

This example image seems to not work on my phone S10+. I am getting blank screen. Are there any specific requirements?

What I see:

Image in question:
https://krakenfiles.com/view/4A2fzGJAtJ/file.html

Add a function to load the thumbnail of an image.

To do:

• only decode first frame of animation
• only partially decode progressive image
• decode preview frame of an image

For some reason, file managers are unable to associate jxlviewer with .jxl files. Every time a .jxl file is clicked inside the file manager, the file manager shows a pop up of ALL possible apps and is unable to save jxlviewer as default. Tested this on

• Material file manager
• Amaze file manager
• Stock Google file manager

Not sure if this is a problem with all these file managers, but just wanted to confirm the app is well associated with image/jxl mimetype (or I think in Android they're called intents?).

.cbz file is a comic book file format that is simply a zip archive of images. Currently, there are no readers supporting the rendering of .jxl files within a .cbz archive.

It will allow other apps to display (maybe even create) jpeg-xl files.

Steps to replicate:

1. Download an image from https://people.csail.mit.edu/ericchan/hdr/hdr-jxl.php
2. Open with JXLviewer
3. Observe the color differences

Images with alpha produce strange results.

Examples:

• Screenshot_20221130-142616
• Screenshot_20221130-142548

As the title says.

Your project is very nice!

Thank you.

Can you also share an IOS app example?

Thank you in advance.

Which ABI are users on ARMv9 supposed to install? :)
none, yet?

For the moment, when native side of the lib encounter an error, it simply return null.

Todo :

• Throw exceptions
• Tests

The app currently does not support color profile in JXL file, so if I load the bench_oriented_BRG test file, colors are wrong (e.g. the bench is green).

the viewer fails to load this file
Rubin golden vase 1 from https://jpegxl.info/art/

I installed ARMv8 on a Pixel 7 Pro Android 13

I know this viewer just uses libjxl. if you tell me it's not a bug in the viewer itself, I'll report a bug over there.
the thing ks: I don't know any way to verify whether this is a valid jxl. (under the finalized jxl spec)

On an Android 9 (stock OS) device, I downloaded an .apk and when I tapped on it to install it and both JXL-viewer and the session installer came up as options.
This sounds unintended.

Add screenshots and description according to Fastlane format.