[Enhancement]: Add better compatibility for Onyx Boox

[szimszon]

Which feature is your request related to?

Pen support

Describe your request for enhancements!

This project is amazing. I bought an Onyx Boox Air5c recently. In Kitt Betts-Masters yt channel was a mention about this app. So i checked it. This app checks all checkmarks except drawing with a pen the line laggs significantly for me bejond usable :(

It wold be great if the onyx sdk could be used somehow (https://mvnrepository.com/artifact/com.onyx.android.sdk/onyxsdk-pen/1.5.0.3) to improve the situation.

Right now I use Saber (https://github.com/saber-notes/saber) for cross platform note taking which has onyx sdk and the pen works fine. The problem is it has some longstanding bugs and same missing features which makes the use of it a bit unplesant.

Thank you.

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[CodeDoctorDE]

Hi thanks for the interest.

I sadly don't have this device so I added the https://github.com/LinwoodDev/Butterfly/issues?q=state%3Aopen%20label%3A%22help%20wanted%22 label. I'm happy for contributions with such a device and having coding experiences.

I saw that this sdk isn't opensource so we might need to make extra binaries for a non foss version.
For implementing this, we could use the same dependency as saber (is also the developer of the library): https://pub.dev/packages/onyxsdk_pen.

[CodeDoctorDE]

Oh and i saw this: onyx-intl/OnyxAndroidDemo#132.
I wouldn't add the dependency to the app if they don't satisfy the play store requirement.

[szimszon]

I asked them about the SDK and I got this reply:
〉Regarding the SDK update, we have a corresponding plan in place, but a specific release date has not yet been finalized.

[szimszon]

Something changed in Onyx repo:

Onyxsdk Pen3 usages
com.onyx.android.sdk » onyxsdk-pen

Onyxsdk Pen
Last Release on Jan 7, 2026

[szimszon]

In onyx-intl/OnyxAndroidDemo#132 Ants666 found a direct link to the SDK: https://repo.boox.com/repository/maven-public/com/onyx/android/sdk/onyxsdk-pen/1.5.4/onyxsdk-pen-1.5.4.aar where this 16 KB page size issue is fixed and told us:

And the Maven coordinates are:

com.onyx.android.sdk:onyxsdk-pen:1.5.4

Breaking changes we had to handle:

the pen rendering classes used by InkDay were renamed:
NeoBrushPen -> NeoBrushPenWrapper
NeoFountainPen -> NeoFountainPenWrapper
NeoMarkerPen -> NeoMarkerPenWrapper