Kivy serive autorestart isn't working

[Loan Qypol]

I am trying to build a rudimentary app with Kivy on android to understand the fundamentals of service.

I am trying to make my **service restart**, but I didn't succeed.

the service work but doesn’t restart

the python code dosen't give me an error, it seem like i've done it wrong,

Does someone know what I did wrong?

*You can directly have access to those file on this github page: https://github.com/Qypol342/kivy-service-restart 

**the architecture of my file:**

 

              -buildozer.spec

              -scr

                |-> main.py

                |-> service.py

**my .spec file:**

```

[app]

# (str) Title of your application

title = Kivy service restart

# (str) Package name

package.name = restartservice

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

package.domain = org.kivy

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

source.dir = src

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

source.include_exts = py,png,jpg,kv,atlas

# (list) List of inclusions using pattern matching

#source.include_patterns = assets/*,images/*.png

# (list) Source files to exclude (let empty to not exclude anything)

#source.exclude_exts = spec

# (list) List of directory to exclude (let empty to not exclude anything)

#source.exclude_dirs = tests, bin

# (list) List of exclusions using pattern matching

#source.exclude_patterns = license,images/*/*.jpg

# (str) Application versioning (method 1)

version.regex = __version__ = '(.*)'

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

# (str) Application versioning (method 2)

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

# version.filename = %(source.dir)s/main.py

# (list) Application requirements

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

requirements = python3,kivy,plyer

# (str) Custom source folders for requirements

# Sets custom source for any requirements with recipes

# requirements.source.kivy = ../../kivy

# (list) Garden requirements

#garden_requirements =

# (str) Presplash of the application

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

# (str) Icon of the application

#icon.filename = %(source.dir)s/data/icon.png

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

orientation = all

# (list) List of service to declare

services = Pong:service.py

#

# OSX Specific

#

#

# author = © Copyright Info

# change the major version of python used by the app

osx.python_version = 3

# Kivy version to use

osx.kivy_version = 1.9.1

#

# Android specific

#

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

fullscreen = 0

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

# Supported formats are: #RRGGBB #AARRGGBB or one of the following names:

# red, blue, green, black, white, gray, cyan, magenta, yellow, lightgray,

# darkgray, grey, lightgrey, darkgrey, aqua, fuchsia, lime, maroon, navy,

# olive, purple, silver, teal.

#android.presplash_color = #FFFFFF

# (list) Permissions

android.permissions = INTERNET

# (int) Android API to use

#android.api = 28

# (int) Minimum API required. You will need to set the android.ndk.api to be as low as this value.

#android.minapi = 21

# (str) Android NDK version to use

#android.ndk = 19c

# (int) Android NDK API to use (optional). This is the minimum API your app will support. 

#android.ndk_api = 21

# (bool) Use --private data storage (True) or --dir public storage (False)

#android.private_storage = True

# (str) Android NDK directory (if empty, it will be automatically downloaded.)

#android.ndk_path =

# (str) Android SDK directory (if empty, it will be automatically downloaded.)

#android.sdk_path =

# (str) ANT directory (if empty, it will be automatically downloaded.)

#android.ant_path =

# (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 entry point, default is ok for Kivy-based app

#android.entrypoint = org.renpy.android.PythonActivity

# (list) Pattern to whitelist for the whole project

#android.whitelist =

# (str) Path to a custom whitelist file

#android.whitelist_src =

# (str) Path to a custom blacklist file

#android.blacklist_src =

# (list) List of Java .jar files to add to the libs so that pyjnius can access

# their classes. Don't add jars that you do not need, since extra jars can slow

# down the build process. Allows wildcards matching, for example:

# OUYA-ODK/libs/*.jar

#android.add_jars = foo.jar,bar.jar,path/to/more/*.jar

# (list) List of Java files to add to the android project (can be java or a

# directory containing the files)

#android.add_src =

# (list) Android AAR archives to add (currently works only with sdl2_gradle

# bootstrap)

#android.add_aars =

# (list) Gradle dependencies to add (currently works only with sdl2_gradle

# bootstrap)

#android.gradle_dependencies =

# (list) Java classes to add as activities to the manifest.

#android.add_activites = com.example.ExampleActivity

# (str) python-for-android branch to use, defaults to stable

p4a.branch = master

# (str) OUYA Console category. Should be one of GAME or APP

# If you leave this blank, OUYA support will not be enabled

#android.ouya.category = GAME

# (str) Filename of OUYA Console icon. It must be a 732x412 png image.

#android.ouya.icon.filename = %(source.dir)s/data/ouya_icon.png

# (str) XML file to include as an intent filters in <activity> tag

#android.manifest.intent_filters =

# (str) launchMode to set for the main activity

#android.manifest.launch_mode = standard

# (list) Android additional libraries to copy into libs/armeabi

#android.add_libs_armeabi = libs/android/*.so

#android.add_libs_armeabi_v7a = libs/android-v7/*.so

#android.add_libs_x86 = libs/android-x86/*.so

#android.add_libs_mips = libs/android-mips/*.so

# (bool) Indicate whether the screen should stay on

# Don't forget to add the WAKE_LOCK permission if you set this to True

#android.wakelock = False

# (list) Android application meta-data to set (key=value format)

#android.meta_data =

# (list) Android library project to add (will be added in the

# project.properties automatically.)

#android.library_references =

# (str) Android logcat filters to use

#android.logcat_filters = *:S python:D

# (bool) Copy library instead of making a libpymodules.so

#android.copy_libs = 1

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

android.arch = armeabi-v7a

#

# Python for android (p4a) specific

#

# (str) python-for-android git clone directory (if empty, it will be automatically cloned from github)

# p4a.source_dir = /home/gabriel/dev/python-for-android/

# (str) The directory in which python-for-android should look for your own build recipes (if any)

#p4a.local_recipes =

# (str) Filename to the hook for p4a

#p4a.hook =

# (str) Bootstrap to use for android builds

p4a.bootstrap = sdl2

# (int) port number to specify an explicit --port= p4a argument (eg for bootstrap flask)

#p4a.port =

#

# iOS specific

#

# (str) Path to a custom kivy-ios folder

#ios.kivy_ios_dir = ../kivy-ios

# (str) Name of the certificate to use for signing the debug version

# Get a list of available identities: buildozer ios list_identities

#ios.codesign.debug = "iPhone Developer: <lastname> <firstname> (<hexstring>)"

# (str) Name of the certificate to use for signing the release version

#ios.codesign.release = %(ios.codesign.debug)s

[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

#    -----------------------------------------------------------------------------

#    List as sections

#

#    You can define all the "list" as [section:key].

#    Each line will be considered as a option to the list.

#    Let's take [app] / source.exclude_patterns.

#    Instead of doing:

#

#[app]

#source.exclude_patterns = license,data/audio/*.wav,data/images/original/*

#

#    This can be translated into:

#

#[app:source.exclude_patterns]

#license

#data/audio/*.wav

#data/images/original/*

#

#    -----------------------------------------------------------------------------

#    Profiles

#

#    You can extend section / key with a profile

#    For example, you want to deploy a demo version of your application without

#    HD content. You could first change the title to add "(demo)" in the name

#    and extend the excluded directories to remove the HD content.

#

#[app@demo]

#title = My Application (demo)

#

#[app:source.exclude_patterns@demo]

#images/hd/*

#

#    Then, invoke the command line with the "demo" profile:

#

#buildozer --profile demo android debug

```

**my main.py file:**

```python

# coding: utf8

__version__ = '0.2'

from kivy.app import App

from kivy.lang import Builder

from kivy.clock import Clock

from kivy.utils import platform

from jnius import autoclass

from plyer import notification

SERVICE_NAME = u'{packagename}.Service{servicename}'.format(

    packagename=u'org.kivy.oscservice',

    servicename=u'Pong'

)

KV = '''

BoxLayout:

    orientation: 'vertical'

    BoxLayout:

        

        

        Button:

            text: 'start service'

            on_press: app.start_service()

        

'''

class ClientServerApp(App):

    def build(self):

        self.service = None

        # self.start_service()

        self.root = Builder.load_string(KV)

        return self.root

    def start_service(self):

        if platform == 'android':

            service = autoclass(SERVICE_NAME)

            

            mActivity = autoclass(u'org.kivy.android.PythonActivity').mActivity

            argument = ''

            

            service.start(mActivity, argument)

            

            notification.notify(title='main', message='service starting')

       

if __name__ == '__main__':

    ClientServerApp().run()

```

**my service.py file:**

```python

import datetime

from plyer import notification

from jnius import autoclass

if __name__ == '__main__':

    notification.notify(title='service', message=str(datetime.datetime.now().time()))

    pyservice = autoclass('org.kivy.android.PythonService')

    pyservice.mService.setAutoRestartService(True)

```

[Loan Qypol]

for a better presentation: https://stackoverflow.com/questions/65859554/kivy-service-wont-restart-autorestart

[planckp...@gmail.com]

the service work but doesn’t restart

How do you know?

Perhaps because the service is always automatically restating, pushing the button does nothing because the service is already running.

So you don't get a notification.

Perhaps this is not shown in the simple example, but using IPC messaging would show this.

The clue is, in this example automatic restarting does not fire millions of notifications at you.

So a an automatic restart is not the same as a cold start.

As I read it an automatic restart runs in the same process as the previous service instance, which might account for the difference.

https://github.com/kivy/python-for-android/blob/develop/pythonforandroid/bootstraps/common/build/src/main/java/org/kivy/android/PythonService.java#L139

Something to test.......

[qypo...@gmail.com]

Yes for me the service was supposed to replace the last notification of the main.py by a notification with as the text the time of the execution.

After clicking the start service button i can click it again and i will get a new notification.

I have try using ocs didn't show it working iter.

I will try a other IPC may be i did it wrong the first time

Is it not simpler to use a print and monitor with adb logcat?

What are the different between a cold start python and a restart? I didn't find a answer on google is there a specific naming?

[planckp...@gmail.com]

Is it not simpler to use a print and monitor with adb logcat?

Whatever is simpler for you.

What are the different between a cold start python and a restart?

The terminology for service starts is mine. Perhaps it is not helpful.

After clicking the start service button i can click it again and i will get a new notification.

Then I didn't understand  the original question.

[qypo...@gmail.com]

I’ve try it differently by take tshirtman work as a base:

https://github.com/tshirtman/kivy_service_osc

But here again the same problem occurs. The service job is just to update the date in the down left corner. The service is supposed to work for a bit then sleep then quit, i’ve add the class autorestart and expecting the date to be updated in 1 hour when the service decide to restart, but this never happened 

Using adb logcat the service start and run correctly and end by “ActivityManager: Process org.kivy.oscservice:service_Pong (pid 27830) has died: svc SVC”

and never start up again, I think is my implementation of restart that isn’t good, 

here it is:

```
from jnius import autoclass

pyservice = autoclass('org.kivy.android.PythonService')

pyservice.mService.setAutoRestartService(True)

from random import sample, randint

from string import ascii_letters

from time import localtime, asctime, sleep

from oscpy.server import OSCThreadServer

from oscpy.client import OSCClient

CLIENT = OSCClient('localhost', 3002)

def ping(*_):

    'answer to ping messages'

    CLIENT.send_message(

        b'/message',

        [

            ''.join(sample(ascii_letters, randint(10, 20)))

            .encode('utf8'),

        ],

    )

def send_date():

    'send date to the application'

    CLIENT.send_message(

        b'/date',

        [asctime(localtime()).encode('utf8'), ],

    )

#if __name__ == '__main__':

SERVER = OSCThreadServer()

SERVER.listen('localhost', port=3000, default=True)

SERVER.bind(b'/ping', ping)

for i in  range(30):

    sleep(1)

    send_date()

sleep(50)
```

[qypo...@gmail.com]

I’ve hashtag "if __name__ == ‘__main__’ :"thinking it was the problem but it didn’t change anything

[qypo...@gmail.com]

I have an update, i’ve taken a older phone and i’ve gotten further (it seem like MIUI if block anny restart)

and by adding ‘sticky’ to my service and then the service tried to restart here is the log

Do you know how to solve this?

01-30 23:55:00.012 1315 4034 I ActivityManager: Process org.kivy.oscservice:service_Pong (pid 29178) has died: svcb SVC 01-30 23:55:00.012 1315 4034 W ActivityManager: Scheduling restart of crashed service org.kivy.oscservice/.ServicePong in 1000ms 01-30 23:55:01.041 1315 1471 I ActivityManager: Start proc 29428:org.kivy.oscservice:service_Pong/u0a165 for service org.kivy.oscservice/.ServicePong 01-30 23:55:01.169 29428 29428 E AndroidRuntime: Process: org.kivy.oscservice:service_Pong, PID: 29428 01-30 23:55:01.169 29428 29428 E AndroidRuntime: java.lang.RuntimeException: Unable to start service org.kivy.oscservice.ServicePong@ae87b11 with null: java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Bundle android.content.Intent.getExtras()' on a null object reference