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package cgeo.geocaching.sensors;
import cgeo.geocaching.enumerations.LocationProviderType;
import cgeo.geocaching.geopoint.Geopoint;
import cgeo.geocaching.utils.Log;
import android.content.Context;
import android.location.Location;
import android.location.LocationManager;
import javax.annotation.Nullable;
public class GeoData extends Location implements IGeoData {
public static final String INITIAL_PROVIDER = "initial";
public static final String FUSED_PROVIDER = "fused";
public static final String LOW_POWER_PROVIDER = "low-power";
// Some devices will not have the last position available (for example the emulator). In this case,
// rather than waiting forever for a position update which might never come, we emulate it by placing
// the user arbitrarly at Paris Notre-Dame, one of the most visited free tourist attractions in the world.
final public static GeoData DUMMY_LOCATION = new GeoData(new Location(INITIAL_PROVIDER));
static {
DUMMY_LOCATION.setLatitude(48.85308);
DUMMY_LOCATION.setLongitude(2.34962);
}
public GeoData(final Location location) {
super(location);
}
@Nullable
static Location best(@Nullable final Location gpsLocation, @Nullable final Location netLocation) {
if (isRecent(gpsLocation) || !(netLocation != null)) {
return gpsLocation;
}
if (!(gpsLocation != null)) {
return netLocation;
}
return gpsLocation.getTime() >= netLocation.getTime() ? gpsLocation : netLocation;
}
@Override
public Location getLocation() {
return this;
}
private static LocationProviderType getLocationProviderType(final String provider) {
if (provider.equals(LocationManager.GPS_PROVIDER)) {
return LocationProviderType.GPS;
}
if (provider.equals(LocationManager.NETWORK_PROVIDER)) {
return LocationProviderType.NETWORK;
}
// LocationManager.FUSED_PROVIDER constant is not available at API level 9
if (provider.equals(FUSED_PROVIDER)) {
return LocationProviderType.FUSED;
}
if (provider.equals(LOW_POWER_PROVIDER)) {
return LocationProviderType.LOW_POWER;
}
return LocationProviderType.LAST;
}
@Override
public LocationProviderType getLocationProvider() {
return getLocationProviderType(getProvider());
}
@Override
public Geopoint getCoords() {
return new Geopoint(this);
}
@Nullable public static GeoData getInitialLocation(final Context context) {
final LocationManager geoManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
if (geoManager == null) {
Log.w("No LocationManager available");
return null;
}
try {
// Try to find a sensible initial location from the last locations known to Android.
final Location lastGpsLocation = geoManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
final Location lastNetworkLocation = geoManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
final Location bestLocation = best(lastGpsLocation, lastNetworkLocation);
if (bestLocation != null) {
bestLocation.setProvider(INITIAL_PROVIDER);
return new GeoData(bestLocation);
}
Log.i("No last known location available");
return null;
} catch (final Exception e) {
// This error is non-fatal as its only consequence is that we will start with a dummy location
// instead of a previously known one.
Log.e("Error when retrieving last known location", e);
return null;
}
}
public static boolean isRecent(@Nullable final Location location) {
return location != null && System.currentTimeMillis() <= location.getTime() + 30000;
}
}
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