Advice for reading logcat to diagnose crashing Kivy app

[Thomas Edwards]

I'm attempting to compile and run the kitchen_sink demo from KivyMD on my phone. It works when running kivy locally on my computer but not on my phone. I run the command `buildozer android debug deploy run` and then I open another terminal and run `adb logcat`. On my phone the app shows the KivyMD splashscreen and then immediately crashes.  

In the log I'm not sure what I'm looking for, it's quite a large log file and I can't find any obvious error message associated with the crash. Could someone give me some advice, i.e what to grep for or something? Thanks 

[planckp...@gmail.com]

Search in the logcat for "Traceback".

The following lines are a Python stack trace. The last line of which is usually the most important.

It is sometimes better to start with "Hello World" as it builds with the default buildozer.spec

[Thomas Edwards]

Thanks, I found the error message:

02-01 11:46:57.975 1391 3165 I python : Traceback (most recent call last):
02-01 11:46:57.975 1391 3165 I python : File "/home/tedwards/code/KivyMD/demos/kitchen_sink/.buildozer/android/app
/main.py", line 9, in <module>
02-01 11:46:57.975 1391 3165 I python : File "/home/tedwards/code/KivyMD/demos/kitchen_sink/.buildozer/android/pla
tform/build-armeabi-v7a/build/python-installs/kitchen_sink/kivymd/__init__.py", line 40, in <module>
02-01 11:46:57.976 1391 3165 I python : File "/home/tedwards/code/KivyMD/demos/kitchen_sink/.buildozer/android/pla
tform/build-armeabi-v7a/build/python-installs/kitchen_sink/kivy/__init__.py", line 138, in require
02-01 11:46:57.976 1391 3165 I python : Exception: The version of Kivy installed on this system is too old. (You hav
e 1.11.1, but the application requires 2.0.0)
02-01 11:46:57.976 1391 3165 I python : Python for android ended.

This is rather odd because I have kivy 2.0.0 installed, yet it thinks I have 1.11.1. This is what it says when I do `python -c "import kivy; print(kivy.__version__)"`:

[INFO ] [Logger ] Record log in /home/tedwards/.kivy/logs/kivy_21-02-03_1.txt
[INFO ] [Kivy ] v2.0.0
[INFO ] [Kivy ] Installed at "/home/tedwards/anaconda/envs/kivy/lib/python3.9/site-packages/kivy/__init__.py"
[INFO ] [Python ] v3.9.1 | packaged by conda-forge | (default, Jan 10 2021, 02:55:42)
[GCC 9.3.0]
[INFO ] [Python ] Interpreter at "/home/tedwards/anaconda/envs/kivy/bin/python"
2.0.0

[Thomas Edwards]

I noticed that in the buildozer.spec file I had kivy==1.11.1 as one of the requirements, but I then changed this to kivy=2.0.0. However, I still get the same error message when I recompile and run the APK. 

[Thomas Edwards]

It won't let me attach files here so here's a copy-paste of the buildozer.spec file:

[app]

# (str) Title of your application

title = KivyMD Kitchen Sink

# (str) Package name

package.name = kitchen_sink

# (str) Package domain (needed for android/ios packaging)

package.domain = com.heattheatr

# (str) Source code where the main.py live

source.dir = .

# (list) Source files to include (let empty to include all the files)

source.include_exts = py,png,jpg,jpeg,ttf,md,kv,json

# (list) List of inclusions using pattern matching

source.include_patterns = assets/*

# (str) Application versioning (method 2)

version.regex = __version__ = ['"](.*)['"]

version.filename = %(source.dir)s/../../kivymd/__init__.py

# (list) Application requirements

# comma separated e.g. requirements = sqlite3,kivy

#requirements = python3,kivy==1.11.1,git+https://github.com/HeaTTheatR/KivyMD.git,pillow,pygments

requirements = python3,kivy==2.0.0,git+https://github.com/HeaTTheatR/KivyMD.git,pillow,pygments

# (str) Custom source folders for requirements

# Sets custom source for any requirements with recipes

requirements.source.kivymd = ../../kivymd

# (str) Presplash of the application

presplash.filename = %(source.dir)s/assets/presplash.png

# (str) Icon of the application

icon.filename = %(source.dir)s/assets/kivy-logo-white-512.png

# (str) Supported orientation (one of landscape, sensorLandscape, portrait or all)

orientation = portrait

# (bool) Indicate if the application should be fullscreen or not

fullscreen = 0

# (string) Presplash background color (for new android toolchain)

android.presplash_color = #FFFFFF

# (list) Permissions

android.permissions = INTERNET,WRITE_EXTERNAL_STORAGE

# (int) Target Android API, should be as high as possible.

android.api = 28

# (int) Minimum API your APK will support.

android.minapi = 21

# (str) Android NDK version to use

android.ndk = 19b

# (bool) If True, then skip trying to update the Android sdk

# This can be useful to avoid excess Internet downloads or save time

# when an update is due and you just want to test/build your package

android.skip_update = False

# (bool) If True, then automatically accept SDK license

# agreements. This is intended for automation only. If set to False,

# the default, you will be shown the license when first running

# buildozer.

android.accept_sdk_license = True

# (str) Android logcat filters to use

# android.logcat_filters = *:S python:D

# (str) The Android arch to build for, choices: armeabi-v7a, arm64-v8a, x86, x86_64

android.arch = armeabi-v7a

[buildozer]

# (int) Log level (0 = error only, 1 = info, 2 = debug (with command output))

log_level = 2

# (int) Display warning if buildozer is run as root (0 = False, 1 = True)

warn_on_root = 0

# (str) Path to build artifact storage, absolute or relative to spec file

build_dir = ./.buildozer

# (str) Path to build output (i.e. .apk, .ipa) storage

bin_dir = ./bin

[Andreas Ecker]

To build the APK, buildozer downloads and compiles CPython and the libraries specified in the requirements setting of buildozer.spec independent from the versions installed on your build system/computer.

Maybe give the requirements setting I currently use a try:

requirements = android, hostpython3==3.7.5, python3==3.7.5, kivy==2.0.0, plyer

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[Andreas Ecker]

... and remember to run `buildozer android clean` before run the compilation via `buildozer android debug`, after changing anything the requirements setting.