1 files changed, 112 insertions, 0 deletions
diff --git a/main/src/cgeo/geocaching/sensors/GpsStatusProvider.java b/main/src/cgeo/geocaching/sensors/GpsStatusProvider.java
new file mode 100644
index 0000000..61243c3
--- /dev/null
+++ b/main/src/cgeo/geocaching/sensors/GpsStatusProvider.java
@@ -0,0 +1,112 @@
+package cgeo.geocaching.sensors;
+
+import cgeo.geocaching.sensors.GpsStatusProvider.Status;
+import cgeo.geocaching.utils.Log;
+import cgeo.geocaching.utils.RxUtils.ConnectableLooperCallbacks;
+
+import rx.Observable;
+import rx.Observable.OnSubscribe;
+import rx.Subscriber;
+import rx.observables.ConnectableObservable;
+import rx.subjects.BehaviorSubject;
+
+import android.content.Context;
+import android.location.GpsSatellite;
+import android.location.GpsStatus;
+import android.location.LocationManager;
+
+public class GpsStatusProvider implements OnSubscribe<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 BehaviorSubject<Status> subject;
+
+    private Status latest = 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);
+        subject = BehaviorSubject.create(latest);
+    }
+
+    public static Observable<Status> create(final Context context) {
+        final GpsStatusProvider provider = new GpsStatusProvider(context);
+        return provider.worker.refCount();
+    }
+
+    @Override
+    public void call(final Subscriber<? super Status> subscriber) {
+        subject.subscribe(subscriber);
+    }
+
+    final ConnectableObservable<Status> worker = new ConnectableLooperCallbacks<Status>(this) {
+        private final GpsStatus.Listener gpsStatusListener = new GpsStatusListener();
+
+        @Override
+        protected void onStart() {
+            Log.d("GpsStatusProvider: starting the GPS status listener");
+            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);
+        }
+    }
+
+}