The purpose of this repo is to provide a reproducible sample project for a bug in an Android app created using Beeware briefcase.
The application, it if worked, would fetch data from a graphql endpoint and display it on the screen. It uses the pydantic library when doing graphql queries.
The briefcase build android command doesn't seem to package the pydantic_core library inside the app, which causes app crashes at runtime, on app startup.
- Build machine: MacOS Sonoma 14.1, Intel chip.
- Python 3.11.6
- Android devices tested:
- Genymotion Cloud emulator, Android 11, x86_64.
- Google Android emulator: Pixel 3, Android 11, x86_64.
- Samsung Galaxy S10+, Android 13.
- Install requirements:
pip install -r requirements.txt - Go into the
helloworldsubdirectory:cd helloworld - Run the app on your local computer:
briefcase dev - Click on the "Fetch!" button
- Verify that the screen displays "A New Hope was released in 1977-05-25"
- Verify that the screen displays "A New Hope was released in 1977-05-25"
- Run the app on an Android device/emulator:
-
briefcase create android -
briefcase build android -
Start and Android emulator, or connect an Android device to your computer.
-
adb install -r build/helloworld/android/gradle/app/build/outputs/apk/debug/app-debug.apk -
Start to capture android logs:
adb lolcat -v threadtime > /tmp/logcat.txt 2>&1 & -
Launch the app.
-
Expected behavior: the app ui appears:
-
Actual behavior: the app crashes. The following appears in
/tmp/logcat.txt:11-18 22:46:32.665 5171 5171 D AndroidRuntime: Shutting down VM 11-18 22:46:32.667 5171 5171 E AndroidRuntime: FATAL EXCEPTION: main 11-18 22:46:32.667 5171 5171 E AndroidRuntime: Process: com.example.helloworld, PID: 5171 11-18 22:46:32.667 5171 5171 E AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.helloworld/org.beeware.android.MainActivity}: com.chaquo.python.PyException: ModuleNotFoundError: No module named 'pydantic_core._pydantic_core' 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3676) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3813) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:101) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2308) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:106) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at android.os.Looper.loopOnce(Looper.java:201) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at android.os.Looper.loop(Looper.java:288) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:7898) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: Caused by: com.chaquo.python.PyException: ModuleNotFoundError: No module named 'pydantic_core._pydantic_core' 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.java.chaquopy.import_override(import.pxi:20) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.java.chaquopy.import_override(import.pxi:60) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.pydantic_core.<module>(__init__.py:6) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.java.chaquopy.import_override(import.pxi:60) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.pydantic.main.<module>(main.py:11) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.java.android.importer.exec_module(importer.py:554) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.java.android.importer.exec_module(importer.py:606) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.importlib.import_module(__init__.py:126) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.pydantic.__getattr__(__init__.py:372) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.java.chaquopy.import_override(import.pxi:60) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.graphql_client.async_base_client.<module>(async_base_client.py:9) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.java.chaquopy.import_override(import.pxi:60) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.graphql_client.<module>(__init__.py:3) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.java.chaquopy.import_override(import.pxi:60) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.helloworld.app.<module>(app.py:7) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.java.chaquopy.import_override(import.pxi:60) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.__main__.<module>(__main__.py:1) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.runpy._run_code(<frozen runpy>:88) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.runpy._run_module_code(<frozen runpy>:98) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.runpy.run_module(<frozen runpy>:226) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.chaquopy_java.call(chaquopy_java.pyx:354) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at <python>.chaquopy_java.Java_com_chaquo_python_PyObject_callAttrThrowsNative(chaquopy_java.pyx:326) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at com.chaquo.python.PyObject.callAttrThrowsNative(Native Method) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at com.chaquo.python.PyObject.callAttrThrows(PyObject.java:232) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at com.chaquo.python.PyObject.callAttr(PyObject.java:221) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at org.beeware.android.MainActivity.onCreate(MainActivity.java:85) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at android.app.Activity.performCreate(Activity.java:8290) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at android.app.Activity.performCreate(Activity.java:8269) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1384) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3657) 11-18 22:46:32.667 5171 5171 E AndroidRuntime: ... 12 more
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The briefcase build android command shows that the whl file for pyndantic_core which is being pulled in is the macosx build:
> Task :app:generateDebugPythonRequirements
Chaquopy: Installing for arm64-v8a
Looking in indexes: https://pypi.org/simple, https://chaquo.com/pypi-7.0, https://chaquo.com/pypi-13.1
Collecting httpx==0.25.1
Using cached httpx-0.25.1-py3-none-any.whl (75 kB)
Collecting pydantic==2.5.1
Using cached pydantic-2.5.1-py3-none-any.whl (381 kB)
Processing /Users/calvarez/Library/Caches/chaquopy/pip/wheels/1d/34/7f/10cb7aee78f14a7b936afe80adf1df7a63a70a549ce8b40ce1/pydantic_core-2.14.3-cp311-cp311-macosx_10_7_x86_64.whl
I guess the correct behavior would be to download or build the whl appropriate for the Android platform.
Note that all the files in helloworld/src/graphql_client were generated by ariadne-codegen and are unmodified.