Android Question GPS start parameters

[dibesw]

I did not understand about the parameters of gps start.

GPS1.Start(0, 100)

mean that if I am within 100 meters does not give me the coordinates?

 

[Mark Read]

The 0 is the speed to aquire a fix, 0 means as quick as possible. The 100 means don't update the position if it is within 100 meters of the last position.

Hope I got that right.

 

[jsanchezc]

First parameter is minimum time in milliseconds, second is minum distance in meters.
GPS1.Start(1000,100)
take lat/long each 1000ms or each 100 meters
if you are within 100 meters of the last position, you'll have a lat/long each 1000ms
if you move 100 meters before 1000ms the you also will have a lat/long.

GPS1.Start(0,100)
If you don't move you will not get lat/long.

To start test GPS i think is better begin with something like GPS1.Start(100,5)
Once your code works you can test other parameters to save battery.

If you don't have battery problems, best is GPS1.Start(0,0)

 

[dibesw]

Thank you, but my case is:

Sub GPS_LocationChanged (Loc As Location)

  Currentloc = Loc
  count = count + 1
  Longitude = Loc.Longitude
  Latitude = Loc.Latitude
  colon = stri.Mid(Longitude,1,8)
  colat = stri.Mid(Latitude,1,8)
  '  orex<>DateTime.GetHour(DateTime.Now) AND minx<>DateTime.GetMinute(DateTime.Now)
  If colon <> lat1 AND colat <> lon1 Then
    createRecord
  End If
  GPS1.Stop
End Sub
Sub Service_Start (StartingIntent As Intent)
  StartServiceAt("", DateTime.Now + 1 * DateTime.TicksPerMinute, False)
  GPS1.Start(0, 100)
End Sub

I have a ServiceStartAt because the service must to start every 1 minute.
I have need not take lat/lon if I not move.
However in this case I take lat/long always (every 1 minues).
So in GPS_LocationChanged sub I was forced to test first 8 char of every lat/lon that takes.
How can I do better?

 

[Erel]

This parameter is not relevant for your program as you are only listening to the first event.

Also note that it is only a hint to the system. You cannot rely on it if the distance is important for you. Instead use the Geodesic class to calculate the distance.

Note that there is a bug in your code. You should not call GPS.Start multiple times without stopping the GPS (as will happen if it takes longer than one minute to get a fix).

 

[dibesw]

Thanks Erel, but how do I know if I do not have GPS signal?
There isn't any event that tell me so.
If Locationchanged not run, how can I do?

 

[Erel]

Not sure that I understand the question. You will not be able to retrieve the location from the GPS until there is a fix.

 

[dibesw]

Yes, I understand, then the question is:
if I haven't location GPS don't stop, then how do I stop the gps?
You said before "Start multiple times without stopping"

 

[Erel]

You can always call GPS.Stop. However a better solution is to avoid calling GPS.Start if it is already running. You can use a process global variable to track the state.