public void OnLocationChanged(Location location)
{
try{
StreamWriter sw;
List<string> lines = new List<string> (File.ReadLines (locationsFile));
if (File.Exists (locationsFile) && lines.Count < maxLineCount) {
sw = File.AppendText (locationsFile);
} else if (File.Exists (locationsFile) && !(lines.Count < maxLineCount)){
sw = new StreamWriter (locationsFile, false);
int i;
for (i = lines.Count* 1/3; i < lines.Count; i++) {
sw.WriteLine (lines [i]);
}
} else {
sw = new StreamWriter(File.Create (locationsFile));
}
//using (StreamWriter sw = File.AppendText (locationsFile)) {
LocationRecord record = new LocationRecord {
time = DateTime.Now.ToLocalTime(),
latitude = location.Latitude,
longitude = location.Longitude,
provider = location.Provider,
recordedSpeed = location.HasSpeed ? location.Speed : double.NaN,
calculatedSpeed = lastRecord != null? calculateSpeed(location.Time,location.Latitude,location.Longitude) : 0,
unixTime = location.Time
};
if (lastRecord != null) {
timeDifference = record.unixTime - lastRecord.unixTime;
sameProviders = record.provider == lastRecord.provider;
}
lastRecord = record;
sw.WriteLine (JsonConvert.SerializeObject (record));
//if (record.calculatedSpeed > speedLimit && !denseUpdates) {
if (record.calculatedSpeed > speedLimit && !denseUpdates && timeDifference > timeBetweenUpdates * 0.5 && sameProviders) {
locMgr.RemoveUpdates (this);
denseUpdates = true;
if(locMgr.IsProviderEnabled(LocationManager.GpsProvider)){
locMgr.RequestLocationUpdates (LocationManager.GpsProvider, timeBetweenUpdatesDense , 0, this);
} else {
locMgr.RequestLocationUpdates (LocationManager.NetworkProvider, timeBetweenUpdatesDense , 0, this);
}
}
if (record.calculatedSpeed < speedLimit && record.recordedSpeed < speedLimit && denseUpdates) {
slowMesurement += 1;
if(slowMesurement > 5){
locMgr.RemoveUpdates (this);
denseUpdates = false;
slowMesurement = 0;
locMgr.RequestLocationUpdates (LocationManager.NetworkProvider, timeBetweenUpdates , 0, this);
}
}
if ((record.calculatedSpeed > speedLimit || record.recordedSpeed > speedLimit) && denseUpdates) {
if (slowMesurement > 0)
slowMesurement--;
}
sw.Close ();
}catch(Exception e){
//Log.Debug ("File created","first time");
}
}
public override void OnStart(Android.Content.Intent intent, int startId)
{
base.OnStart (intent, startId);
//base.OnStartCommand(intent,StartCommandFlags.Redelivery,startId);
settingsFile = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
settingsFile = Path.Combine(settingsFile, "settings.txt");
if (File.Exists (settingsFile)) {
SettingsRecord settings = JsonConvert.DeserializeObject<SettingsRecord>( File.ReadAllText(settingsFile));
timeBetweenUpdates = settings.timeBetweenUpdates;
timeBetweenUpdatesDense = settings.timeBetweenUpdatesDense;
speedLimit = settings.speedLimit;
}
locMgr = GetSystemService (Context.LocationService) as LocationManager;
locMgr.RequestLocationUpdates (LocationManager.NetworkProvider, timeBetweenUpdates , 0, this);
locationsFile = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
locationsFile = Path.Combine(locationsFile, "locations.txt");
if (File.Exists (locationsFile)) {
List<string> lines = new List<string> (File.ReadLines (locationsFile));
if (lines.Count > 0) {
lastRecord = JsonConvert.DeserializeObject<LocationRecord> (lines [lines.Count - 1]);
}
// if (lines.Count >= maxLineCount) {
// int i;
// StreamWriter sw = new StreamWriter (locationsFile, false);
// for (i = 2/3 * maxLineCount; i < lines.Count; i++) {
// sw.WriteLine (lines [i]);
// }
// sw.Close ();
// }
}
}
