Question

I’d like to track my Location every minute. For that I use a locManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 60000, 0, pll);

Here is the log when my phone is idle.

Date     Latitude             Longitude          Accuracy
07:45:35 51.362402459999996 - 6.2174867399999995 (75.0)
07:46:35 51.362402459999996 - 6.2174867399999995 (75.0)
07:47:35 51.362402459999996 - 6.2174867399999995 (75.0)
...
07:50:35 51.362402459999996 - 6.2174867399999995 (75.0) # I'm further than 75m away from my home at that time

I’ve indeed a new location every minute but it is exactly the same. Just the time is updated. The position is not updated (maybe normal when I don’t move enough) but I find it strange that the coordinates are exactly the same. Also as I don’t have wireless activated, it should locate me accordingly to the CellId (with an accuracy of ~1000m), here I still have an accuracy of 75.0. It seems, it is the last location recorded using wireless networks.

Any idea how can I record the real last location (even with low accuracy) ?

public void onLocationChanged(Location location) {
    System.out.println(new Date(location.getTime())+" "
            +location.getLatitude()+" - "+location.getLongitude()+" ("+location.getAccuracy()+")");
    callback.addEntry(location);
}

Answer 1

It seems there is no way to force to compute the position using the LocationManager with the celltower only when there is no wireless connexion.
Maybe another way would be to use the method mentioned in the thread Poor Man GPS : manually compute the position knowing the CellId.

Pseudo code :

onLocationChanged(new_location)
    if isConnected()
       record(new_location)
    else
       cell_location = poorManGPS()
       record(cell_location)
    end

The problem is of course that I cannot query the cell-id database with no internet connection. I see several solutions :

• Store the current (and previous) cell id when I have internet and hope I’ll stay in this one when I won’t have internet
• Use the cell id database on the phone (but I think root privileges needed)
• Store the cell id for further localization