[Android 15 16KB]Where do the dependent pre-built native libraries come from?

[robinshi-mega]

To be able to use this library under Android 15 with 16KB page size enabled, we'd like to rebuild this library, so we could use the library on an Android 15 device with 16KB page size enabled.
But It is hard to find out where the 3 pre-built native libraries come from... If anyone can give any clue, that will be much appreciated! Thanks.

• libmodpng.so - is this the https://github.com/pnggroup/libpng?
• libmodft2.so - I couldn't figure out what this is.
• libmodpdfium.so - I assume this is from the Google's pdfium. Is this the one https://pdfium.googlesource.com/pdfium/?

[kkrol2]

@robinshi-mega have you managed to rebuild it by any chance? It seems that it might be difficult to find source for libmodft2.so

[robinshi-mega]

@kkrol2 thanks. I haven't yet. :(
I guess libmodft2 might be the FreeType2(https://freetype.org/).

[sixtsense]

@kkrol2, @robinshi-mega If you guys are still looking for 16kb page size .so files I recently had to update our fork of the PdfiumAndroid library to support it - https://github.com/pCloud/pdfium-core. You can either directly checkout the .so files or follow the BUILD_NATIVE.md guide to build your own pdfium native from starch.

[robinshi-mega]

Thank you @sixtsense.
We have also managed to build the .so files in repository https://github.com/meganz/PdfiumAndroid. Instead of build the PdfiumCore by ourselves, we downloaded it from https://github.com/bblanchon/pdfium-binaries.
👍

[KPsanz]

Thank you @sixtsense. We have also managed to build the .so files in repository https://github.com/meganz/PdfiumAndroid. Instead of build the PdfiumCore by ourselves, we downloaded it from https://github.com/bblanchon/pdfium-binaries. 👍

@robinshi-mega

If im currently using flutter_pdfviwer, which in Android build.gradle uses:

implementation 'com.github.mhiew:android-pdf-viewer:3.2.0-beta.3'

Which has not been updated for 3 years.

How would i go about using your fork?

[robinshi-mega]

@KPsanz
There is a build.sh under the repo https://github.com/meganz/PdfiumAndroid. bash build.sh will build the PdfiumAndroid code.
Parameter --build-png can build png library.
Parameter --build-freetype can build freetype library.
If the build is successfully, you can find the output in build folder builddir.

[ynkfish]

Hi! I've created an updated fork that solves compatibility issues with modern Android development:

https://github.com/ynkfish/PdfiumAndroid

What it fixes:
✅ Android SDK 35 / NDK 28 compatibility
✅ Android Gradle Plugin 8.9.2 support (had some trouble with later AGP versions, might look into this another time)
✅ Android 15 (16KB page size) support
✅ BuildConfig generation issues
✅ Native library packaging in AAR

I'm on Windows, so I've modified the meganz build script to run from Git bash and use ninja build tool.

All build instructions and details are in the README. This fork builds on the excellent work from @barteksc and the meganz (@robinshi-mega) fork. Thanks for the great foundation! 🙏

[chiragthummar]

If anyone looking for the aar file here it is.
Thanks @robinshi-mega and @ynkfish For the updates.

https://github.com/chiragthummar/PdfiumAndroid16KB/blob/master/aar/PdfiumAndroid-2.0.0-release.aar

[Aiuspaktyn]

@ynkfish and @chiragthummar
Why is the minSdkVersion now 26, when it used to be 14?

[ynkfish]

@ynkfish and @chiragthummar Why is the minSdkVersion now 26, when it used to be 14?

I took over the settings from the project in which I was using this library.
You might be able to dial it down a few versions if you need a lower min sdk.

[pcg92]

Hello @ynkfish I’ve tried adding your library to barteksc/AndroidPdfViewer, and when testing it on an emulator that supports 16KB pages, I get an error — I can’t get pdfium to respond. Have you verified that it works correctly?

my.app                    A  Fatal signal 11 (SIGSEGV), code 2 (SEGV_ACCERR), fault addr 0x79318777e004 in tid 22611 (my.app), pid 22611 (my.app)

2025-08-02 21:24:16.388 22918-22918 DEBUG                   crash_dump64                         A  Cmdline: my.app

2025-08-02 21:24:16.388 22918-22918 DEBUG                   crash_dump64                         A  pid: 22611, tid: 22611, name: my.app  >>> my.app <<<

2025-08-02 21:24:16.388 22918-22918 DEBUG                   crash_dump64                         A        #01 pc 000000000003e07c  /data/app/~~FD8JN2_pf07LeuhXNPnhFA==/my.app-4Sp97eJdujtsTCog31iUOw==/base.apk!libc++_shared.so (offset 0xc24000) (BuildId: 71ac2d89ae5db431295e18ccf28c26e6b95b216f)

2025-08-02 21:24:16.388 22918-22918 DEBUG                   crash_dump64                         A        #18 pc 00000000000039e8  /data/app/~~FD8JN2_pf07LeuhXNPnhFA==/my.app-4Sp97eJdujtsTCog31iUOw==/base.apk (offset 0x3c000) (com.shockwave.pdfium.PdfiumCore.<clinit>+0)

2025-08-02 21:24:16.388 22918-22918 DEBUG                   crash_dump64                         A        #27 pc 0000000000008588  /data/app/~~FD8JN2_pf07LeuhXNPnhFA==/my.app-4Sp97eJdujtsTCog31iUOw==/base.apk (offset 0x44000) (com.github.barteksc.pdfviewer.PDFView.<init>+0)

2025-08-02 21:24:16.388 22918-22918 DEBUG                   crash_dump64                         A        #51 pc 000000000017d58c  /data/app/~~FD8JN2_pf07LeuhXNPnhFA==/my.app-4Sp97eJdujtsTCog31iUOw==/base.apk (offset 0x13bc000) (androidx.appcompat.app.AppCompatDelegateImpl.setContentView+0)

2025-08-02 21:24:16.388 22918-22918 DEBUG                   crash_dump64                         A        #56 pc 0000000000178810  /data/app/~~FD8JN2_pf07LeuhXNPnhFA==/my.app-4Sp97eJdujtsTCog31iUOw==/base.apk (offset 0x13bc000) (androidx.appcompat.app.AppCompatActivity.setContentView+0)

2025-08-02 21:24:16.388 22918-22918 DEBUG                   crash_dump64                         A        #61 pc 0000000000020328  /data/app/~~FD8JN2_pf07LeuhXNPnhFA==/my.app-4Sp97eJdujtsTCog31iUOw==/base.apk (offset 0x148000) (my.app.presentation.PdfViewerActivity.onCreate+0