serious_python_android 4.1.1 changelog

4.1.1 #

Fix app crashing on launch on Android 8.1 and below (API < 28). The getAppVersion method-channel handler, called on every startup, used PackageInfo.getLongVersionCode() (API 28+) unconditionally. R8 outlines this call into a synthetic class that it can merge with other API 28+ outlines — notably Flutter 3.41's ImageDecoder-based image decoder — and invoking that merged class on API < 28 fails verification with NoClassDefFoundError: android.graphics.ImageDecoder$OnHeaderDecodedListener. The call is now guarded with a Build.VERSION.SDK_INT check, falling back to the deprecated versionCode int field on older devices.
Fix the embedded interpreter crashing on startup on a non-primary ABI (e.g. an x86_64 emulator when arm64-v8a is the primary ABI) with ModuleNotFoundError: No module named '_sysconfigdata__android_<arch>-linux-android'. The ABI-common stdlib.zip was built from the primary ABI only, dropping every other ABI's arch-specific _sysconfigdata__android_<arch> module — which CPython imports at startup via sysconfig (pulled in by ctypes). The primary splitStdlib task now also harvests each other ABI's _sysconfigdata__android_<arch> into stdlib.zip (only that arch-specific module, so the generic ABI-identical _sysconfigdata__linux_ shipped by some versions like 3.12 isn't duplicated).

4.1.0 #

Run the extractAsset / unzipAsset / loadLibrary method-channel handlers on a background Executor (posting the Result back on the main looper) instead of inline on the platform main thread. The first-launch asset unpack and the pyjnius native-library load no longer block Android's Choreographer, so Flutter's vsync isn't starved and on-screen animations (e.g. a boot/splash spinner) stay smooth while the app starts.
Ship consumer ProGuard/R8 keep rules (-keep class com.flet.serious_python_android.** { *; }) so release (minified) builds don't obfuscate or strip the classes pyjnius resolves by name at runtime. Without them R8 renamed PythonActivity and dropped its static mActivity field, breaking pyjnius in release builds with type object 'C.f' has no attribute 'mActivity' (debug builds were unaffected).
Version bump aligning with the serious_python_* 4.1.0 release.

4.0.0 #

Ship the app as a stored app.zip asset in the APK and unpack it once (version-keyed) to <application-support>/flet/app on the first launch after install/update, via the new prepareApp(). The version-keyed unpack moved out of run(); user data in the sibling <application-support>/data is preserved across updates.
Resolve the support dir via path_provider getApplicationSupportDirectory() (== context.getFilesDir()) and drop the custom getFilesDir method channel; the payload base moves from flet/py to flet/.
Synthesize an empty __init__.py for __init__-less package directories when building stdlib.zip/sitepackages.zip, so zipimport can import PEP 420 namespace packages (e.g. flask.sansio).
SERIOUS_PYTHON_ANDROID_EXTRACT_PACKAGES entries now support */? wildcards matched against the top-level name (e.g. flask* also extracts flask-<version>.dist-info/).
Restore pyjnius support under the FFI model: re-add the loadLibrary method channel and load its JNI helper (libpyjni.so) via Java System.loadLibrary before the interpreter starts, so the helper's JNI_OnLoad captures the JavaVM + app ClassLoader (dart:ffi's dlopen for libdart_bridge never triggers JNI_OnLoad). Best-effort — a no-op for apps that don't depend on pyjnius.
Version bump aligning with the serious_python_* 4.0.0 release.

3.0.0 #

In-process Python (dart_bridge FFI). The Python lifecycle now runs through libdart_bridge.so (from flet-dev/dart-bridge 1.4.0) instead of a socket transport.
Native modules are memory-mapped from the APK — no more useLegacyPackaging. Python extension modules (stdlib lib-dynload and site-packages) are relocated into jniLibs/<abi>/lib<mangled>.so and loaded directly from the APK by a custom sys.meta_path finder that resolves them from .soref markers — no extraction to disk, still ABI-split by the Play Store. Pure Python ships in stored, ABI-common asset zips read via zipimport, so the stdlib is no longer duplicated per ABI. This replaces the previous scheme of zipping stdlib/site-packages into fake lib*.so files (which required useLegacyPackaging). The dart-bridge Android binary now uses the full CPython API (PyConfig) to install the finder before site runs. Set SERIOUS_PYTHON_ANDROID_EXTRACT_PACKAGES (comma-separated relative paths) to ship path-hungry packages extracted to disk instead.
Breaking change: requires Flutter 3.44.2. Moves to AGP 8.11.1, Gradle 8.11.1, compileSdk 36, Java 17, and the Kotlin-DSL Gradle build (build.gradle.kts).
build.gradle resolves the Python version from the generated python_versions.properties (a snapshot of python-build's manifest.json): SERIOUS_PYTHON_VERSION selects the version; the full version, build date and dart_bridge version derive from the table, with SERIOUS_PYTHON_FULL_VERSION / SERIOUS_PYTHON_BUILD_DATE / DART_BRIDGE_VERSION left as escape hatches. Downloads continue to use python-build's date-keyed release scheme.
Drop the x86 (32-bit Intel) ABI — Flutter no longer produces it. ABIs are arm64-v8a + x86_64 (plus armeabi-v7a on Python 3.12).
Remove the scaffold getPlatformVersion method.

2.0.0 #

Breaking change: default bundled Python version is now 3.14 (was 3.12). Apps built without an explicit SERIOUS_PYTHON_VERSION env var pull the 3.14 python-build distribution and ship libpython3.14.so. Set SERIOUS_PYTHON_VERSION=3.12 (typically threaded through flet build) to preserve the previous default.
Multi-version Python support. python_version in android/build.gradle reads from SERIOUS_PYTHON_VERSION and drives the flet-dev/python-build download URL.
The Dart runtime no longer hardcodes libpython3.12.so — it scans nativeLibraryDir for libpython3.*.so so whichever libpython the plugin bundled is loaded automatically.
abiFilters now branches on python_version: keep armeabi-v7a for 3.12, restrict to arm64-v8a + x86_64 for 3.13+ (python-build dropped 32-bit Android per PEP 738).

1.0.1 #

Improvements #

Cache downloaded Python distribution tarballs (python-android-dart-<py>-<abi>.tar.gz) across builds. The downloadDistArchive_* Gradle tasks now write to a persistent cache directory — $FLET_CACHE_DIR/python-build/v<python_version>/ if the env var is set, otherwise ~/.flet/cache/python-build/v<python_version>/ — and use onlyIfModified true + useETag "all" so subsequent builds issue a conditional GET (If-None-Match / If-Modified-Since) against objects.githubusercontent.com instead of re-downloading 30–100 MB per ABI per build. When the upstream release republishes a tarball at the same URL (e.g. a Python patch update under the existing v<py> release), the validators flip and the cache refreshes automatically; otherwise the build skips the download entirely. tempAndMove true guards against partial downloads being kept in the cache (flet-dev/flet#6555, #208) by @FeodorFitsner.

Bug fixes #

Set PIP_REQUIRE_VIRTUALENV=false for pip install in the package command so packaging works in environments where users have globally exported PIP_REQUIRE_VIRTUALENV=true (#202, #204) by @FeodorFitsner.

1.0.0 #

Breaking change: --platform argument value Pyodide has been renamed to Emscripten to match what platform.system() returns in the Pyodide runtime, so PEP 508 markers like platform_system != 'Emscripten' work consistently.

0.9.12 #

Fix web packaging to skip site-packages when appropriate (#199).

0.9.11 #

Disable user-site packages in pip environment (#195).

0.9.10 #

Android: Add debug logs and deduplicate FFI imports.
Android: Invalidate extracted assets when version keys change.

0.9.9 #

Add zipDirectoryPosix to create POSIX-compliant app archives on Windows.
Enforce C++20 standard for serious_python plugin build.
Fix: Normalize WINDIR path for bundled DLLs in CMake.
Fix Logcat logging crash on some Android devices.

0.9.8 #

Fix logging on Android.

0.9.7 #

Fix app restart on Android 10.
Redirect Python output to logcat.

0.9.6 #

Make zipDirectory call asynchronous.

0.9.5 #

Bump archive to ^4.0.7.
Fixed iOS framework identifier generation.

0.9.4 #

16 KB memory page support for Android 15+ (by @ReYaNOW).

0.9.3 #

Fix: Hidden files in site-packages are skipped when building macOS app.
Fix: Do not delete package metadata in .dist-info directories (#164).

0.9.2 #

Breaking change: multiple --requirements options of package command must be passed as --requirements DEP_1 --requirements DEP_2 ... (or -r DEP_1 -r DEP_2 ...) instead of -r DEP_1,DEP_2,... to support dependency specifications with commas, e.g. pandas>=2.2,<3.
Fix site-packages packaging for Pyodide platform.

0.9.1 #

Fix serious_python to work on macOS 12 Monterey and built with Xcode 14.

0.9.0 #

Set MinimumOSVersion to 13.0 for generated Python frameworks.
iOS and macOS packaging: Python system libraries are put into python.bundle to pass App Store verification.
On macOS, Windows, and Linux, application site packages are copied in an unpacked state to the application bundle to speed up the first launch.
Pyodide 0.27.2
Python 3.12.9
Packaging --cleanup option replaced with two separate --cleanup-app and --cleanup-packages options.
New packaging options --cleanup-app-files and --cleanup-package-files to specify a list of globs to exclude files and directories from app and site packages.
New packaging --skip-site-packages option to skip site packages installation for faster re-builds.
Packaging --arch option accepts a list now.

0.8.7 #

Fixed: xcframeworks migration script didn't work for sub-directories.

0.8.6 #

Added com.flet.serious_python_android.PythonActivity holder class with mActivity holding a reference to an app MainActivity. Needed for plyer.
Android plugin sets MAIN_ACTIVITY_HOST_CLASS_NAME environment variable with the name of activity holder class name (com.flet.serious_python_android.PythonActivity).
Android plugin sets MAIN_ACTIVITY_CLASS_NAME environment variable with a class name of an app MainActivity.
Android plugin sets ANDROID_NATIVE_LIBRARY_DIR environment variable with the path to a directory containing app .so libraries. Needed for patching ctypes.find_library.
Changed behavior of SERIOUS_PYTHON_ALLOW_SOURCE_DISTRIBUTIONS environment variable that should contain a comma-separated list of packages to allow installation from source distribution.
Fixed: iOS site-packages to xcframeworks migration script supports both library.so and library.{something}.so.

0.8.5 #

Added Java loadLibrary to Android plugin to support pyjnius (#128).

0.8.4 #

Copy site-packages/flutter contents to SERIOUS_PYTHON_FLUTTER_PACKAGES.
Added SERIOUS_PYTHON_ALLOW_SOURCE_DISTRIBUTIONS variable to allow pip installing from source distributions.

0.8.3 #

Remove PYTHONOPTIMIZE=2 to make CFFI work.

0.8.2 #

Copy .so libraries from {site-packages}/opt to jniLibs.

0.8.1 #

Remove --only-binary when packaging for desktop platforms (#112)
Fixed: only pass string args ('script') if they are not null. (#77)
Fixed: script set as empty string to fix windows build error (#83)

0.8.0 #

New packaging, not based on Kivy and with pre-built binary packages.

0.7.1 #

Added namespace definition to Android Gradle build.
Bump dependencies.

0.7.0 #

runPython() method to support running Python script.
Updated flet_example to catch program output and errors, sys.exit() support.
package command to read dependencies from pyproject.toml.

0.6.1 #

--exclude option for package command - to exclude directories and files from Python app package.
Re-create temp Python distributive directory on every run of package command.

0.6.0 #

--verbose flag - verbose output.
--mobile flag - (removes .so) from app dest archive.
--web flag for packaging for pyodide.
--find-links option for installing pip dependencies from alternative sources (indexes).
--dep-mappings for rewriting flet dependency to either flet-embed or flet-pyodide.
--req-deps for adding required dependencies like flet-embed or flet-pyodide.
--platform option for use with sitecustomize.py to tweak pip to pull platform-specific packages.
More structured regular output.
Bump deps versions.

0.5.1 #

Simplified Python initialization on Android.

0.5.0 #

Python 3.11.6.

0.4.1 #

Bumping version after fixing pubspec.yaml.

0.4.0 #

macOS, Windows and Linux support.

0.3.0 #

Initial version.

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