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package cgeo.geocaching.sensors;
import cgeo.geocaching.sensors.GpsStatusProvider.Status;
import cgeo.geocaching.utils.Log;
import cgeo.geocaching.utils.RxUtils.LooperCallbacks;
import rx.Observable;
import android.content.Context;
import android.location.GpsSatellite;
import android.location.GpsStatus;
import android.location.LocationManager;
public class GpsStatusProvider extends LooperCallbacks<Status> {
public static class Status {
final public boolean gpsEnabled;
final public int satellitesVisible;
final public int satellitesFixed;
public Status(final boolean gpsEnabled, final int satellitesVisible, final int satellitesFixed) {
this.gpsEnabled = gpsEnabled;
this.satellitesVisible = satellitesVisible;
this.satellitesFixed = satellitesFixed;
}
}
private final LocationManager geoManager;
private final GpsStatus.Listener gpsStatusListener = new GpsStatusListener();
private Status latest = new Status(false, 0, 0);
private static final Status NO_GPS = new Status(false, 0, 0);
/**
* Build a new gps status provider object.
* <p/>
* There is no need to instantiate more than one such object in an application, as observers can be added
* at will.
*
* @param context the context used to retrieve the system services
*/
protected GpsStatusProvider(final Context context) {
geoManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
}
public static Observable<Status> create(final Context context) {
return Observable.create(new GpsStatusProvider(context));
}
@Override
protected void onStart() {
Log.d("GpsStatusProvider: starting the GPS status listener");
subject.onNext(NO_GPS);
geoManager.addGpsStatusListener(gpsStatusListener);
}
@Override
protected void onStop() {
Log.d("GpsStatusProvider: stopping the GPS status listener");
geoManager.removeGpsStatusListener(gpsStatusListener);
}
private final class GpsStatusListener implements GpsStatus.Listener {
@Override
public void onGpsStatusChanged(final int event) {
switch (event) {
case GpsStatus.GPS_EVENT_FIRST_FIX:
case GpsStatus.GPS_EVENT_SATELLITE_STATUS: {
final GpsStatus status = geoManager.getGpsStatus(null);
int visible = 0;
int fixed = 0;
for (final GpsSatellite satellite : status.getSatellites()) {
if (satellite.usedInFix()) {
fixed++;
}
visible++;
}
if (visible == latest.satellitesVisible && fixed == latest.satellitesFixed) {
return;
}
latest = new Status(true, visible, fixed);
break;
}
case GpsStatus.GPS_EVENT_STARTED:
latest = new Status(true, 0, 0);
break;
case GpsStatus.GPS_EVENT_STOPPED:
latest = new Status(false, 0, 0);
break;
default:
throw new IllegalStateException();
}
subject.onNext(latest);
}
}
}
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