tshirtman / kivy_service_osc

simple UI/Service communication using osc on python-for-android

Purpose

This code aims at demonstrating an use of services in python-for-android, and communication between services and a kivy front end.

That examples uses the OSC protocol for simplicity and historical reasons, (since an implementation was shipped with kivy historically, and a better one is now found in oscpy). The OSC protocol makes things simple because it's unconnected, you just send a message, and can forget about it. You bind functions to messages you receive. It's simple enough for a lot of things, and avoids the burden of maintaining a connection when both the service and front end can be restarted any time.

The app is composed of the front-end, defined in src/main.py, and the back-end defined in src/service.py.

The service (back-end):

• is defined in buildozer.spec, in the services line. Following the example syntax
• is started by the application at startup time, and can be stopped/restarted from the UI.
• sends the current date, as a string, every tenth of a second to the UI, on a '/date' address.
• answers with a random string on the '/message' address when a message is sent to the '/ping' address on its side.

The UI (front-end):

• is defined in main.py
• allows stopping/restarting the backend.
• displays the last received messages from the backend in a RecycleView
• allow to sent a '/ping' message to the backend, which will trigger a new message.

Building:

• The package is built using CircleCI, you should be able to download the latest debug apk by clicking on the "Artifacts" tab on the latest build.
• This project is a template repository, so you can create your own project from it, and setup CircleCI to build your version of it.
• You can also just run the kivy/buildozer docker image to build your project from any Linux computer.

docker run -v $PWD:/project/ -w /project/ kivy/buildozer android debug

Once it's completed, you should have a bin/ directory with the apk inside.

kivy_service_osc's Issues

Is there a way to get the service alive?

When the phone goes to sleep or I change to other app for a while, Android kills the service. I get the following error

ActivityManager: Stopping service due to app idle u0a262 -1m55s386ms org.kivy.oscservice/.ServicePong

Is there a way to get the service alive in these situations?

Python modules in service.py

I can use only standard library of python in service.py
When I am using other python modules service being stop.

How can I change package name and package domain?

When I changed package.name = oscservice to package.name = BatteryProtector and package.domain = org.kivy to package.domain = org.ipfelec in buildozer.spec, app don't run. I also changed the following code, the app will not run.

 SERVICE_NAME = u'{packagename}.Service{servicename}'.format(
     packagename=u'org.ipfelec.BatteryProtect',
     servicename=u'Pong'
 )

This is my Error:

09-01 02:07:54.443  2162  2200 I python  :  Traceback (most recent call last):
09-01 02:07:54.443  2162  2200 I python  :    File "/media/mehdi/2436ef15-26cf-4be8-9eed-6befb73eddd8/mehdi/Documents/BuildozerTest/.buildozer/android/app/main.py", line 398, in <module>
09-01 02:07:54.443  2162  2200 I python  :    File "/media/mehdi/2436ef15-26cf-4be8-9eed-6befb73eddd8/mehdi/Documents/BuildozerTest/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/BatteryProtector/kivy/app.py", line 949, in run
09-01 02:07:54.444  2162  2200 I python  :    File "/media/mehdi/2436ef15-26cf-4be8-9eed-6befb73eddd8/mehdi/Documents/BuildozerTest/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/BatteryProtector/kivy/app.py", line 919, in _run_prepare
09-01 02:07:54.444  2162  2200 I python  :    File "/media/mehdi/2436ef15-26cf-4be8-9eed-6befb73eddd8/mehdi/Documents/BuildozerTest/.buildozer/android/app/main.py", line 317, in build
09-01 02:07:54.444  2162  2200 I python  :    File "/media/mehdi/2436ef15-26cf-4be8-9eed-6befb73eddd8/mehdi/Documents/BuildozerTest/.buildozer/android/app/main.py", line 334, in start_service
09-01 02:07:54.445  2162  2200 I python  :    File "/media/mehdi/2436ef15-26cf-4be8-9eed-6befb73eddd8/mehdi/Documents/BuildozerTest/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/BatteryProtector/jnius/reflect.py", line 208, in autoclass
09-01 02:07:54.445  2162  2200 I python  :    File "jnius/jnius_export_func.pxi", line 28, in jnius.jnius.find_javaclass
09-01 02:07:54.446  2162  2200 I python  :  jnius.jnius.JavaException: Class not found b'org/ipfelec/BatteryProtector/ServicePong'
09-01 02:07:54.446  2162  2200 I python  : Python for android ended.

Is it possible for me to change these names?

ImportError: cannot import name 'osc' from 'kivy.lib'

Hi, I'm new with kivy and wanted to run the kivy_service_osc example.
Yet, I get a "ImportError: No module named android". I have tried several things but always got this error and the kivy window does not appear.
my buildozer.spec has:
title = Kivy service OSC demo
package.name = serviceexample
package.domain = org.test
requirements = kivy
android.permissions = INTERNET
android.sdk = 20
android.ndk = 13b

I set NDK 13b because 9b isn't available anymore to download from Google.

I have attached the buildozer android logcat log from the respective process 3930

I don't know whether this is the right place to report my issue but didn't find another place.

Question : push notification or play sound from service?

Is it possible to push a notification or play a sound while the service and app are running in the background?
Any example or hint how to add this feature to the existing code : play a sound every minute?
Kind Regards, Hans

service crash with android_new toolchain

Hi!
On my device, this application crash as soon as it's started. Funny thing is that it happen just when the build is compiled through the "android_new" toolchain rather than the old "android".

I can't really say if the issue comes from the code or the toolchain, but commenting the line #48 (autostart of the service) the app open correctly. Then if I manually hit the button to "start service" appear crash pop-up: "Unfortunately, Kivy service OSC demo has stopped"

Should be indicated some other modules in buildozer when building with the android_new toolchain?
Thanks!

service.stop() fails

service.stop() fails on desktop and on Android for different reasons.

Desktop: threading.Thread() has no stop() method

Android, using the same buildozer.spec : pyjnius is not happy

11-05 16:51:41.447 30426 30460 I python  :  Traceback (most recent call last):
11-05 16:51:41.447 30426 30460 I python  :    File "/home/bobf/ex/service/.buildozer/android/app/main.py", line 116, in <module>
11-05 16:51:41.447 30426 30460 I python  :    File "/home/bobf/ex/service/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/oscservice/kivy/app.py", line 855, in run
11-05 16:51:41.448 30426 30460 I python  :    File "/home/bobf/ex/service/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/oscservice/kivy/base.py", line 504, in runTouchApp
11-05 16:51:41.448 30426 30460 I python  :    File "/home/bobf/ex/service/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/oscservice/kivy/core/window/window_sdl2.py", line 747, in mainloop
11-05 16:51:41.448 30426 30460 I python  :    File "/home/bobf/ex/service/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/oscservice/kivy/core/window/window_sdl2.py", line 479, in _mainloop
11-05 16:51:41.448 30426 30460 I python  :    File "/home/bobf/ex/service/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/oscservice/kivy/base.py", line 342, in idle
11-05 16:51:41.449 30426 30460 I python  :    File "/home/bobf/ex/service/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/oscservice/kivy/base.py", line 327, in dispatch_input
11-05 16:51:41.449 30426 30460 I python  :    File "/home/bobf/ex/service/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/oscservice/kivy/base.py", line 233, in post_dispatch_input
11-05 16:51:41.449 30426 30460 I python  :    File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
11-05 16:51:41.449 30426 30460 I python  :    File "/home/bobf/ex/service/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/oscservice/kivy/core/window/__init__.py", line 1402, in on_motion
11-05 16:51:41.449 30426 30460 I python  :    File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
11-05 16:51:41.450 30426 30460 I python  :    File "/home/bobf/ex/service/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/oscservice/kivy/core/window/__init__.py", line 1418, in on_touch_down
11-05 16:51:41.450 30426 30460 I python  :    File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
11-05 16:51:41.450 30426 30460 I python  :    File "/home/bobf/ex/service/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/oscservice/kivy/uix/widget.py", line 549, in on_touch_down
11-05 16:51:41.450 30426 30460 I python  :    File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
11-05 16:51:41.450 30426 30460 I python  :    File "/home/bobf/ex/service/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/oscservice/kivy/uix/widget.py", line 549, in on_touch_down
11-05 16:51:41.451 30426 30460 I python  :    File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
11-05 16:51:41.451 30426 30460 I python  :    File "/home/bobf/ex/service/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/oscservice/kivy/uix/behaviors/button.py", line 151, in on_touch_down
11-05 16:51:41.451 30426 30460 I python  :    File "kivy/_event.pyx", line 703, in kivy._event.EventDispatcher.dispatch
11-05 16:51:41.451 30426 30460 I python  :    File "kivy/_event.pyx", line 1214, in kivy._event.EventObservers.dispatch
11-05 16:51:41.452 30426 30460 I python  :    File "kivy/_event.pyx", line 1098, in kivy._event.EventObservers._dispatch
11-05 16:51:41.452 30426 30460 I python  :    File "/home/bobf/ex/service/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/oscservice/kivy/lang/builder.py", line 64, in custom_callback
11-05 16:51:41.452 30426 30460 I python  :    File "<string>", line 12, in <module>
11-05 16:51:41.452 30426 30460 I python  :    File "/home/bobf/ex/service/.buildozer/android/app/main.py", line 100, in stop_service
11-05 16:51:41.452 30426 30460 I python  :    File "jnius/jnius_export_class.pxi", line 745, in jnius.jnius.JavaMethod.__call__
11-05 16:51:41.453 30426 30460 I python  :  jnius.jnius.JavaException: Invalid call, number of argument mismatch, got 0 need 1
11-05 16:51:41.453 30426 30460 I python  : Python for android ended.