mirror of https://github.com/kivy/kivy.git
Created An example of background Twisted server running on Android (markdown)
Veselin Penev
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Usually if you need to integrate Twisted inside Kivy App on Android you have to do something like that in your `main.py`:
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```python
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from kivy.support import install_twisted_reactor
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install_twisted_reactor()
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```
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But if you do not need Kivy UI in your "background" Twisted server you can just directly run `ractor.run()` and be happy.
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But there is another issue. Seems like the latest changes in Android requires Android services to also populate some notification to user. This is how you can run "foreground" service that will run "Hello, world!" Twisted server on your Android device non-stop:
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```python
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import sys
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from twisted.internet import reactor
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from twisted.internet import protocol
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from twisted.web import server, resource
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import logging
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logging.basicConfig(level=logging.DEBUG)
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from twisted.internet.defer import setDebugging
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setDebugging(True)
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from twisted.python.log import startLogging
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startLogging(sys.stdout)
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class Simple(resource.Resource):
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isLeaf = True
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def render_GET(self, request):
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logging.info('Hello, world!')
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return b"<html>Hello, world!</html>"
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def set_auto_restart_service(restart=True):
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logging.info('set_auto_restart_service restart=%r', restart)
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from jnius import autoclass
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Service = autoclass('org.kivy.android.PythonService').mService
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Service.setAutoRestartService(restart)
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def set_foreground():
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logging.info('set_foreground')
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from jnius import autoclass
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channel_id = 'org.twisted_sample.twistedsample.Twistedsample'
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Context = autoclass(u'android.content.Context')
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Intent = autoclass(u'android.content.Intent')
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PendingIntent = autoclass(u'android.app.PendingIntent')
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AndroidString = autoclass(u'java.lang.String')
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NotificationBuilder = autoclass(u'android.app.Notification$Builder')
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NotificationManager = autoclass(u'android.app.NotificationManager')
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NotificationChannel = autoclass(u'android.app.NotificationChannel')
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notification_channel = NotificationChannel(
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channel_id, AndroidString('TwistedSample Channel'.encode('utf-8')), NotificationManager.IMPORTANCE_HIGH)
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Notification = autoclass(u'android.app.Notification')
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service = autoclass('org.kivy.android.PythonService').mService
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PythonActivity = autoclass(u'org.kivy.android.PythonActivity')
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notification_service = service.getSystemService(
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Context.NOTIFICATION_SERVICE)
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notification_service.createNotificationChannel(notification_channel)
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app_context = service.getApplication().getApplicationContext()
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notification_builder = NotificationBuilder(app_context, channel_id)
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title = AndroidString("TwistedSample".encode('utf-8'))
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message = AndroidString("Application is running in background".encode('utf-8'))
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app_class = service.getApplication().getClass()
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notification_intent = Intent(app_context, PythonActivity)
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notification_intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |
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Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_NEW_TASK)
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notification_intent.setAction(Intent.ACTION_MAIN)
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notification_intent.addCategory(Intent.CATEGORY_LAUNCHER)
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intent = PendingIntent.getActivity(service, 0, notification_intent, 0)
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notification_builder.setContentTitle(title)
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notification_builder.setContentText(message)
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notification_builder.setContentIntent(intent)
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Drawable = autoclass(u"{}.R$drawable".format(service.getPackageName()))
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icon = getattr(Drawable, 'icon')
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notification_builder.setSmallIcon(icon)
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notification_builder.setAutoCancel(True)
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new_notification = notification_builder.getNotification()
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service.startForeground(1, new_notification)
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logging.info('set_foreground DONE : %r' % service)
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def main():
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argument = os.environ.get('PYTHON_SERVICE_ARGUMENT', 'null')
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argument = json.loads(argument) if argument else None
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argument = {} if argument is None else argument
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logging.info('argument=%r', argument)
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if argument.get('stop_service'):
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logging.info('service to be stopped')
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return
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try:
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set_foreground()
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set_auto_restart_service()
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site = server.Site(Simple())
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srv = reactor.listenTCP(18000, site)
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logging.info('starting reactor with %r at %r' % (site, srv.getHost(), ))
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reactor.run()
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logging.info('twisted reactor stopped')
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set_auto_restart_service(False)
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except Exception:
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logging.exception('Exception in main()')
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# avoid auto-restart loop
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set_auto_restart_service(False)
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if __name__ == '__main__':
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main()
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logging.info('EXIT')
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```
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You can find buildozer project ready to use in this repo: https://github.com/vesellov/android-twisted-service
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