Changed a time in my activity to a service but it crashes

[jkurant]

I have an app that every 10 seconds makes a list of the wireless networks it can see and does some other stuff including updating a listing on screen of which networks it can see.

I was having the screen refresh every 10 seconds using a timer. Then, I wanted to switch to using a service so my app could keep recording networks even when the activity was paused. So, I set my timer to run every 10 seconds. The app starts up and the event fires once or twice but then it crashes.

I can't imagine why.

Here is my Activity_Create code that used to initialize the timer but now calls StartService(Agent)

Sub Activity_Create(FirstTime As Boolean)
   SuppressNextSQLLogging = False   
   tabsInsideMargin = 10dip
   wifi.ABLoadWifi() ' start loading wifi info, asynchronously

   Activity.LoadLayout("Main")
   tabs.AddTab("Status", "TabStatus")
   tabs.AddTab("Places", "TabPlaces")
   tabs.AddTab("Reminders", "TabReminders")
   tabs.AddTab("Settings", "TabSettings")
   tabs.CurrentTab = ActiveTab
   
   '-------------- NO UI CODE Above this point --------------

   LogToActivity("KurantReminder startup")

   ' Initialize database
   'File.Delete(File.DirInternal, "KurantReminders.db")
   If File.Exists(File.DirInternal, "KurantReminders.db") Then
      ' good
   Else
      ' we have to create it from scratch
      CreateDatabase
   End If
   db.Initialize(File.DirInternal, "KurantReminders.db", False)
   LogToActivity("Database initalization complete")
   
   ' Set up display
   MyVisibleNetworks.Initialize
   MyPlaces.Initialize
   DisplayAndLoadActivityLog

   'TimerCheckRadio.Initialize("TimerCheckRadio", TimerIntervalWhenInactive) ' start slow because resume will start it up
   StartService(Agent)
End Sub

Here is the agent:

'Service module
Sub Process_Globals
   'These global variables will be declared once when the application starts.
   'These variables can be accessed from all modules.
   Dim ServiceStartCount As Int
End Sub
Sub Service_Create
   ToastMessageShow("Service_Create", False)
End Sub

Sub Service_Start (StartingIntent As Intent)
   ServiceStartCount = ServiceStartCount + 1
   ToastMessageShow("Service_Start, #" & ServiceStartCount, False)
   CallSub(Main,"TimerCheckRadio_Tick")
   ToastMessageShow("TimerCheckRadio_Tick, #" & ServiceStartCount, False)
   StartServiceAt("", DateTime.Now + 10*DateTime.TicksPerSecond, False)
End Sub

Sub Service_Destroy
   ToastMessageShow("Service_Destroy", False)
End Sub

In Main, TimerCheckRadio_Tick used to do stuff, but to rule out any code itself causing the problem, I commented it out.

Even this crashes after one or two cycles:

Sub TimerCheckRadio_Tick
   ToastMessageShow("TimerCheckRadio_Tick", False)
'   RefreshVisibleNetworks
'   DisplayVisibleNetworks
'   
'   Dim ThisPlace As Place
'   Dim p As Int
'   For p = 0 To MyPlaces.Size-1
'      ThisPlace = MyPlaces.Get(p)
'            
'      If ThisPlace.Status = "I Am Here" Then
'         RecordTheseNetworksAsBeingAtThisPlace(ThisPlace)
'      Else
'         If ANetworkAtThisPlaceIsVisible(ThisPlace) Then
'            ThisPlace.Status = "Here"
'         Else
'            ThisPlace.Status = "Not Here"
'         End If
'      End If
'      
'   Next
'
'   DisplayPlaces
'   RefreshStatusDisplay
End Sub

 

[jkurant]

I get tick #0 and tick #1 and then the crash which you can see in the screenshot.

 

[jkurant]

Am I doing this right? I thought I could call code in an activity module from a service module and that the code in the activity module can write to the UI.

 

[Erel]

You should check the logs (including the unfiltered logs) and find the full error message.