Restarts killed roll pulling service, fixes #103

Uses `Service.setAutoRestartService()` to restart service when killed,
refs kivy/python-for-android#1374

src/service/main.py

@@ -2,6 +2,7 @@
 from time import sleep
 
 from kivy.storage.jsonstore import JsonStore
+from kivy.utils import platform
 from plyer import notification
 
 from ethereum_utils import AccountUtils
@@ -31,6 +32,17 @@ def start(self):
             self.pull_accounts_rolls()
             sleep(PULL_FREQUENCY_SECONDS)
 
+    @staticmethod
+    def set_auto_restart_service(restart=True):
+        """
+        Makes sure the service restarts automatically on Android when killed.
+        """
+        if platform != 'android':
+            return
+        from jnius import autoclass
+        PythonService = autoclass('org.kivy.android.PythonService')
+        PythonService.mService.setAutoRestartService(restart)
+
     @property
     def pyetheroll(self):
         """
@@ -156,8 +168,10 @@ def do_notify(self, merged_logs):
         notification.notify(**kwargs)
 
 
+
 def main():
     service = MonitorRollsService()
+    service.set_auto_restart_service()
     service.start()