private void retrieveLocation() {
Location location = null;
final Iterator<String> providers =
mLocationManager.getProviders(new Criteria(), true).iterator();
while (providers.hasNext()) {
final Location lastKnownLocation = mLocationManager.getLastKnownLocation(providers.next());
// pick the most recent location
if (location == null
|| (lastKnownLocation != null
&& location.getElapsedRealtimeNanos()
< lastKnownLocation.getElapsedRealtimeNanos())) {
location = lastKnownLocation;
}
}
// In the case there is no location available (e.g. GPS fix or network location
// is not available yet), the longitude of the location is estimated using the timezone,
// latitude and accuracy are set to get a good average.
if (location == null) {
Time currentTime = new Time();
currentTime.set(System.currentTimeMillis());
double lngOffset =
FACTOR_GMT_OFFSET_LONGITUDE * (currentTime.gmtoff - (currentTime.isDst > 0 ? 3600 : 0));
location = new Location("fake");
location.setLongitude(lngOffset);
location.setLatitude(0);
location.setAccuracy(417000.0f);
location.setTime(System.currentTimeMillis());
location.setElapsedRealtimeNanos(SystemClock.elapsedRealtimeNanos());
if (DEBUG) {
Slog.d(TAG, "Estimated location from timezone: " + location);
}
}
setLocation(location);
}
// The user has moved if the accuracy circles of the two locations don't overlap.
private static boolean hasMoved(Location from, Location to) {
if (to == null) {
return false;
}
if (from == null) {
return true;
}
// if new location is older than the current one, the device hasn't moved.
if (to.getElapsedRealtimeNanos() < from.getElapsedRealtimeNanos()) {
return false;
}
// Get the distance between the two points.
float distance = from.distanceTo(to);
// Get the total accuracy radius for both locations.
float totalAccuracy = from.getAccuracy() + to.getAccuracy();
// If the distance is greater than the combined accuracy of the two
// points then they can't overlap and hence the user has moved.
return distance >= totalAccuracy;
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
public static JSONObject location2Json(Location location) throws JSONException {
JSONObject latLng = new JSONObject();
latLng.put("lat", location.getLatitude());
latLng.put("lng", location.getLongitude());
JSONObject params = new JSONObject();
params.put("latLng", latLng);
if (VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
params.put("elapsedRealtimeNanos", location.getElapsedRealtimeNanos());
} else {
params.put("elapsedRealtimeNanos", 0);
}
params.put("time", location.getTime());
/*
SimpleDateFormat format = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
Date date = new Date(location.getTime());
params.put("timeFormatted", format.format(date));
*/
if (location.hasAccuracy()) {
params.put("accuracy", location.getAccuracy());
}
if (location.hasBearing()) {
params.put("bearing", location.getBearing());
}
if (location.hasAltitude()) {
params.put("altitude", location.getAltitude());
}
if (location.hasSpeed()) {
params.put("speed", location.getSpeed());
}
params.put("provider", location.getProvider());
params.put("hashCode", location.hashCode());
return params;
}
