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package cgeo.geocaching.sensors;
import cgeo.geocaching.CgeoApplication;
import cgeo.geocaching.playservices.LocationProvider;
import cgeo.geocaching.sensors.GpsStatusProvider.Status;
import cgeo.geocaching.settings.Settings;
import cgeo.geocaching.utils.AngleUtils;
import cgeo.geocaching.utils.Log;
import cgeo.geocaching.utils.RxUtils;
import org.eclipse.jdt.annotation.NonNull;
import rx.Observable;
import rx.functions.Action1;
import rx.functions.Func1;
import android.content.Context;
import java.util.concurrent.atomic.AtomicBoolean;
public class Sensors {
private Observable<GeoData> geoDataObservable;
private Observable<GeoData> geoDataObservableLowPower;
private Observable<Float> directionObservable;
private Observable<Status> gpsStatusObservable;
@NonNull private volatile GeoData currentGeo = GeoData.DUMMY_LOCATION;
private volatile float currentDirection = 0.0f;
private volatile boolean hasValidLocation = false;
private final boolean hasCompassCapabilities;
private final CgeoApplication app = CgeoApplication.getInstance();
private static class InstanceHolder {
static final Sensors INSTANCE = new Sensors();
}
private final Action1<GeoData> rememberGeodataAction = new Action1<GeoData>() {
@Override
public void call(final GeoData geoData) {
currentGeo = geoData;
hasValidLocation = true;
}
};
private final Action1<Float> onNextrememberDirectionAction = new Action1<Float>() {
@Override
public void call(final Float direction) {
currentDirection = direction;
}
};
private Sensors() {
gpsStatusObservable = GpsStatusProvider.create(app).replay(1).refCount();
final Context context = CgeoApplication.getInstance().getApplicationContext();
hasCompassCapabilities = RotationProvider.hasRotationSensor(context) || OrientationProvider.hasOrientationSensor(context);
}
public static final Sensors getInstance() {
return InstanceHolder.INSTANCE;
}
private final Func1<Throwable, Observable<GeoData>> fallbackToGeodataProvider = new Func1<Throwable, Observable<GeoData>>() {
@Override
public Observable<GeoData> call(final Throwable throwable) {
Log.e("Cannot use Play Services location provider, falling back to GeoDataProvider", throwable);
Settings.setUseGooglePlayServices(false);
return GeoDataProvider.create(app);
}
};
public void setupGeoDataObservables(final boolean useGooglePlayServices, final boolean useLowPowerLocation) {
if (useGooglePlayServices) {
geoDataObservable = LocationProvider.getMostPrecise(app).onErrorResumeNext(fallbackToGeodataProvider).doOnNext(rememberGeodataAction);
if (useLowPowerLocation) {
geoDataObservableLowPower = LocationProvider.getLowPower(app).doOnNext(rememberGeodataAction).onErrorResumeNext(geoDataObservable);
} else {
geoDataObservableLowPower = geoDataObservable;
}
} else {
geoDataObservable = RxUtils.rememberLast(GeoDataProvider.create(app).doOnNext(rememberGeodataAction), null);
geoDataObservableLowPower = geoDataObservable;
}
}
private static final Func1<GeoData, Float> GPS_TO_DIRECTION = new Func1<GeoData, Float>() {
@Override
public Float call(final GeoData geoData) {
return AngleUtils.reverseDirectionNow(geoData.getBearing());
}
};
public void setupDirectionObservable(final boolean useLowPower) {
// If we have no magnetic sensor, there is no point in trying to setup any, we will always get the direction from the GPS.
if (!hasCompassCapabilities) {
Log.i("No compass capabilities, using only the GPS for the orientation");
directionObservable = RxUtils.rememberLast(geoDataObservableLowPower.map(GPS_TO_DIRECTION).doOnNext(onNextrememberDirectionAction), 0f);
return;
}
// Combine the magnetic direction observable with the GPS when compass is disabled or speed is high enough.
final AtomicBoolean useDirectionFromGps = new AtomicBoolean(false);
// The rotation sensor seems to be bogus on some devices. We should start with the orientation one, except when we explicitely
// want to use the low-power geomagnetic rotation sensor or when we do not have an orientation sensor.
final boolean useRotationSensor = (useLowPower && RotationProvider.hasGeomagneticRotationSensor(app)) || !OrientationProvider.hasOrientationSensor(app);
final Observable<Float> sensorDirectionObservable = useRotationSensor ? RotationProvider.create(app, useLowPower) : OrientationProvider.create(app);
final Observable<Float> magneticDirectionObservable = sensorDirectionObservable.onErrorResumeNext(new Func1<Throwable, Observable<? extends Float>>() {
@Override
public Observable<? extends Float> call(final Throwable throwable) {
Log.e("Device orientation is not available due to sensors error, disabling compass", throwable);
Settings.setUseCompass(false);
return Observable.<Float>never().startWith(0.0f);
}
}).filter(new Func1<Float, Boolean>() {
@Override
public Boolean call(final Float aFloat) {
return Settings.isUseCompass() && !useDirectionFromGps.get();
}
});
final Observable<Float> directionFromGpsObservable = geoDataObservableLowPower.filter(new Func1<GeoData, Boolean>() {
@Override
public Boolean call(final GeoData geoData) {
final boolean useGps = geoData.getSpeed() > 5.0f;
useDirectionFromGps.set(useGps);
return useGps || !Settings.isUseCompass();
}
}).map(GPS_TO_DIRECTION);
directionObservable = RxUtils.rememberLast(Observable.merge(magneticDirectionObservable, directionFromGpsObservable).doOnNext(onNextrememberDirectionAction), 0f);
}
public Observable<GeoData> geoDataObservable(final boolean lowPower) {
return lowPower ? geoDataObservableLowPower : geoDataObservable;
}
public Observable<Float> directionObservable() {
return directionObservable;
}
public Observable<Status> gpsStatusObservable() {
if (gpsStatusObservable == null) {
gpsStatusObservable = GpsStatusProvider.create(app).share();
}
return gpsStatusObservable;
}
@NonNull
public GeoData currentGeo() {
return currentGeo;
}
public boolean hasValidLocation() {
return hasValidLocation;
}
public float currentDirection() {
return currentDirection;
}
public boolean hasCompassCapabilities() {
return hasCompassCapabilities;
}
}
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