Android Question How to stop gps after getting coordinates ?

[systems1]

Hello,
This is my service code which take GPS Coordinates every ten minutes . What I need is how can i stop the GPS after getting coordinates ?

Here I can see it is updating coordinates of each movements. I don't want to trace each movements, just current coordinates after that stop searching. and it will start searching after 10 minutes.

Also if I don't get the coordinates suppose I am inside home how can i stop searching ?

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.
    Dim GPS1 As GPS
    Dim TimerService As Timer
    Dim Counter As Int
    Counter=0
    Dim Notification1 As Notification
End Sub
Sub Service_Create
    TimerService.Initialize("TimerService",600000)   
      TimerService.Enabled=True   
End Sub

Sub Service_Start (StartingIntent As Intent)   
    If GPS1.IsInitialized = False Then
        GPS1.Initialize("GPS")
    End If
    If GPS1.GPSEnabled = False Then
        ToastMessageShow("Please enable the GPS device.", True)
        StartActivity(GPS1.LocationSettingsIntent)
    Else
        GPS1.Start(0,0)
    End If
End Sub
Sub TimerService_Tick        
    If GPS1.IsInitialized = False Then
        GPS1.Initialize("GPS")
    End If
    If GPS1.GPSEnabled = False Then
        ToastMessageShow("Please enable the GPS device.", True)
        StartActivity(GPS1.LocationSettingsIntent)
    Else
        GPS1.Start(0,0)
    End If   
End Sub
Sub Service_Destroy
    GPS1.Stop
End Sub
Sub GPS_LocationChanged (Location1 As Location)
      Main.SQL1.ExecNonQuery2("UPDATE settings SET latitude=?,longitude=?",Array As Object(Location1.Latitude,Location1.Longitude))   
End Sub

Please help me

Thanks and regards.

 

[Erel]

You should call GPS.Stop in GPS_LocationChanged event.

 

[systems1]

You should call GPS.Stop in GPS_LocationChanged event.

Thanks for your replay but it is not stopping.

 

[Erel]

How do you see that it doesn't stop? Maybe the event is still raised a few times because of existing messages in the message queue.

 

[systems1]

How do you see that it doesn't stop? Maybe the event is still raised a few times because of existing messages in the message queue.

When the app look for coordinates I can see a small blinking satellite icon on the top of the device. I can see the same blinking satellite icon even if i close the app/stop the gps from app

 

[Erel]

Add a Log message to this sub. You will see that it is not called any more. Maybe the GPS continues to run for awhile.

 

[Berj]

Hello Erel,
I have the same problem with gps service I use in my app.
I set the service to run every 3 minutes and log gps coordinates in a table.
I see too many rows in the table which means that "GPS2.Stop" does not actually stop the GPS.
I've noticed that this happens when the device is in movement (car).

Sub GPS2_LocationChanged (Location1 As Location)
    If Location1.Accuracy<30 Then           
        Main.SQL1.ExecNonQuery("insert into gps_log(timest,latitude,longitude) values(datetime('now'),'"&Location1.Latitude&"','"&Location1.Longitude&"')")
        Main.g_lat=Location1.Latitude
        Main.g_long=Location1.Longitude
        Main.g_gps_last = DateTime.Date(DateTime.Now) &" "& DateTime.Time(DateTime.Now)

        Main.SQL1.ExecNonQuery("update gps set gps_last='"&Main.g_gps_last&"',latitude='"&Location1.Latitude&"',longitude='"&Location1.Longitude&"'")
        GPS2.Stop
       
        Log("1")
       
    End If
End Sub

i am starting the gps with following code

    If GPS2.IsInitialized=False Then
        GPS2.Initialize("GPS2")
    End If
   
    If GPS2.GPSEnabled = False Then
        StartActivity(GPS2.LocationSettingsIntent) 'Will open the relevant settings screen.
    Else
        GPS2.Start(500, 20) 'Listen to GPS with no filters.
    End If

Regards,
Berj

 

[Berj]

I think I found where is my error. I have one more GPS object in my Main module... so i probably it blocks the normal work of service. It works fine when there is one GPS obeject.

It is still not working as i am expecting ... but i will try some more time.
Regards

 

[Alistair Sim]

Hi Erel (and anybody else that might be able to help

Is my understanding correct that the GPS library can only return a location through the GPS_LocationChanged sub?
So then, if I want to see what the current location is, the user would in fact have to move at least once.
Is there maybe a library function that I'm missing somewhere that will give me the current position?
In the app that I'm writing I simply need to start the GPS object, get the location and set it to a keyvalue store and then stop the gps_object.

Kind Regards
Alistair Sim

 

[Erel]

There are other libraries that allow you to get the current known location.

About the GPS, if you set the two parameters in GPS.Start to 0 then the event will fire very rapidly. So the user doesn't really need to move in order for the first event to fire.