Recipe request: h3 for Android / timezonefinder 8.x fails with x86_64 h3 .so in arm64-v8a APK

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#3,348 opened on Jun 21, 2026 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 45/100

Issue type: Feature
Clarity: Mostly clear
Activity status: Quiet
Tech stack: android, python
Domain: build-system, mobile

Research direction

Start with the h3/_cy/init.py import path and the reduced requirements containing h3 and timezonefinder, then build for the listed arm64-v8a target. Done means importing timezonefinder succeeds on an arm64 Android device without the EM_X86_64 versus EM_AARCH64 error.

Written by the indexing model from the issue text.

Description

I have been told to be free to request a working python-for-android recipe for h3.

The practical issue is that current timezonefinder versions depend on h3. With Buildozer / python-for-android, the APK builds, but the application crashes at runtime on an Android arm64 device because the packaged h3 native extension is for x86_64 instead of ARM64.

For now I have to pin:

timezonefinder==4.4.1

because newer timezonefinder versions pull in h3. I am not sure how long this is viable.

Runtime error

On Android, importing timezonefinder imports h3, and this fails:

ImportError: dlopen failed: "/data/data/xx.xx.xx/files/app/_python_bundle/site-packages/h3/_cy/cells.so" is for EM_X86_64 (62) instead of EM_AARCH64 (183)

Relevant traceback:

File ".../timezonefinder/__init__.py", line 1, in <module>
File ".../timezonefinder/timezonefinder.py", line 22, in <module>
File ".../h3/__init__.py", line 3, in <module>
File ".../h3/api/__init__.py", line 3, in <module>
File ".../h3/api/basic_int/__init__.py", line 5, in <module>
File ".../h3/_cy/__init__.py", line 16, in <module>
ImportError: dlopen failed: ".../h3/_cy/cells.so" is for EM_X86_64 (62) instead of EM_AARCH64 (183)

Environment

OS: Linux Mint / Ubuntu 24.04 base
Python: 3.12.3 virtualenv
Buildozer: 1.6.1.dev0 from git
python-for-android branch: develop
python-for-android commit: 70f92243
Android API: 36
Android min API: 24
Android NDK: r28c
Target architecture: arm64-v8a / armeabi-v7a
Device: arm64 Android device

Relevant requirements

In the real project this happens with:

requirements = python3,kivy==2.3.1,android,jpeg,pillow,olefile,pytz,skyfield,numpy,jplephem,sgp4,h3,timezonefinder

A reduced version could look like this:

requirements = python3,kivy==2.3.1,android,numpy,h3,timezonefinder

Dominant language: Python
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