Java InternalCompassOrientationProvider类代码示例

import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; //导入依赖的package包/类
private void mapSetup() {
    map = (MapView) getActivity().findViewById(R.id.createPoiMap);

    //important! set your user agent to prevent getting banned from the osm servers
    Configuration.getInstance().load(getActivity(), PreferenceManager.getDefaultSharedPreferences(getActivity()));

    map.setTileSource(TileSourceFactory.MAPNIK);
    map.setTilesScaledToDpi(true);

    // add multi-touch capability
    map.setMultiTouchControls(true);

    // add compass to map
    CompassOverlay compassOverlay = new CompassOverlay(getActivity(), new InternalCompassOrientationProvider(getActivity()), map);
    compassOverlay.enableCompass();
    map.getOverlays().add(compassOverlay);

    // get map controller
    IMapController controller = map.getController();

    GeoPoint position = new GeoPoint(latitude, longitude);
    controller.setCenter(position);
    controller.setZoom(18);
    MapUtils.addMarker(getActivity(), map, latitude, longitude);
}
 

import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; //导入依赖的package包/类
private void mapSetup() {
    map = (MapView) getActivity().findViewById(R.id.map);  // create basic map
    mController = map.getController(); // get map controller
    map.setTileSource(TileSourceFactory.MAPNIK);
    map.setTilesScaledToDpi(true);
    map.setMultiTouchControls(true);

    // add compass to map
    CompassOverlay compassOverlay = new CompassOverlay(getActivity(), new InternalCompassOrientationProvider(getActivity()), map);
    compassOverlay.enableCompass();
    map.getOverlays().add(compassOverlay);

    //attach listeners
    MapEventsOverlay mapEventsOverlay = new MapEventsOverlay(this);
    map.getOverlays().add(0, mapEventsOverlay);
    setupMyLocation();
}
 

import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; //导入依赖的package包/类
private void setupMapPreview(double lat, double lon, String markerTitle) {
    //important! set your user agent to prevent getting banned from the osm servers
    Configuration.getInstance().load(getDialog().getContext(), PreferenceManager.getDefaultSharedPreferences(getDialog().getContext()));

    map = (MapView) getDialog().findViewById(R.id.poiDialogMap);
    map.setTileSource(TileSourceFactory.MAPNIK);
    map.setTilesScaledToDpi(true);
    map.setMultiTouchControls(true);

    // add compass to map
    CompassOverlay compassOverlay = new CompassOverlay(getDialog().getContext(), new InternalCompassOrientationProvider(getDialog().getContext()), map);
    compassOverlay.enableCompass();
    map.getOverlays().add(compassOverlay);

    // get map controller
    IMapController controller = map.getController();
    GeoPoint position = new GeoPoint(lat, lon);
    controller.setCenter(position);
    controller.setZoom(18);

    MapUtils.addMarker(getActivity(), map, lat, lon, markerTitle);
}
 

import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; //导入依赖的package包/类
private void mapSetup() {
    map = (MapView) getActivity().findViewById(R.id.createPoiMap);
    //important! set your user agent to prevent getting banned from the osm servers
    Configuration.getInstance().load(getActivity(), PreferenceManager.getDefaultSharedPreferences(getActivity()));
    map.setTileSource(TileSourceFactory.MAPNIK);
    map.setTilesScaledToDpi(true);
    map.setMultiTouchControls(true);

    CompassOverlay compassOverlay = new CompassOverlay(getActivity(), new InternalCompassOrientationProvider(getActivity()), map);
    compassOverlay.enableCompass();
    map.getOverlays().add(compassOverlay);

    IMapController controller = map.getController();
    GeoPoint position = new GeoPoint(POI.getLatitude(), POI.getLongitude());
    controller.setCenter(position);
    controller.setZoom(18);

    MapUtils.addMarker(getActivity(), map, POI.getLatitude(), POI.getLongitude());
}
 

import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; //导入依赖的package包/类
@Override
public void onResume() {
     super.onResume();
     final String tileSourceName = mPrefs.getString(PREFS_TILE_SOURCE,
             TileSourceFactory.DEFAULT_TILE_SOURCE.name());
     try {
          final ITileSource tileSource = TileSourceFactory.getTileSource(tileSourceName);
          mMapView.setTileSource(tileSource);
     } catch (final IllegalArgumentException e) {
          mMapView.setTileSource(TileSourceFactory.DEFAULT_TILE_SOURCE);
     }
     if (mPrefs.getBoolean(PREFS_SHOW_LOCATION, false)) {
          this.mLocationOverlay.enableMyLocation();
     }

    //sorry for the spaghetti code this is to filter out the compass on api 8
    //Note: the compass overlay causes issues on API 8 devices. See https://github.com/osmdroid/osmdroid/issues/218
     if (mPrefs.getBoolean(PREFS_SHOW_COMPASS, false)) {
         if (mCompassOverlay!=null) {
             //this call is needed because onPause, the orientation provider is destroyed to prevent context leaks
             this.mCompassOverlay.setOrientationProvider(new InternalCompassOrientationProvider(getActivity()));
             this.mCompassOverlay.enableCompass();
         }
     }
    mMapView.onResume();
}
 

import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; //导入依赖的package包/类
/**
 * Description:     Initialises the Map and sets initial options such as:
 * Zoom levels and controls
 * Compass
 * ScaleBar
 * Cluster Pin colors
 * Location update settings
 */
private void setUpMapIfNeeded() {

    // Check if we were successful in obtaining the map.
    mMap.setBuiltInZoomControls(true);
    mMap.setMultiTouchControls(true);
    mMap.setMinZoomLevel(3);
    mMap.setMaxZoomLevel(19); // Latest OSM can go to 21!
    mMap.getTileProvider().createTileCache();
    mCompassOverlay = new CompassOverlay(this, new InternalCompassOrientationProvider(this), mMap);

    ScaleBarOverlay mScaleBarOverlay = new ScaleBarOverlay(this);
    mScaleBarOverlay.setScaleBarOffset(getResources().getDisplayMetrics().widthPixels / 2, 10);
    mScaleBarOverlay.setCentred(true);

    // Sets cluster pin color
    mCellTowerGridMarkerClusterer = new CellTowerGridMarkerClusterer(MapViewerOsmDroid.this);
    //BitmapDrawable mapPinDrawable = (BitmapDrawable) getResources().getDrawable(R.drawable.ic_map_pin_orange);
    BitmapDrawable mapPinDrawable = (BitmapDrawable) ResourcesCompat.getDrawable(getResources(),R.drawable.ic_map_pin_orange, null);

    mCellTowerGridMarkerClusterer.setIcon(mapPinDrawable == null ? null : mapPinDrawable.getBitmap());

    GpsMyLocationProvider gpsMyLocationProvider = new GpsMyLocationProvider(MapViewerOsmDroid.this.getBaseContext());
    gpsMyLocationProvider.setLocationUpdateMinDistance(100); // [m]  // Set the minimum distance for location updates
    gpsMyLocationProvider.setLocationUpdateMinTime(10000);   // [ms] // Set the minimum time interval for location updates
    mMyLocationOverlay = new MyLocationNewOverlay(MapViewerOsmDroid.this.getBaseContext(), gpsMyLocationProvider, mMap);
    mMyLocationOverlay.setDrawAccuracyEnabled(true);

    mMap.getOverlays().add(mCellTowerGridMarkerClusterer);
    mMap.getOverlays().add(mMyLocationOverlay);
    mMap.getOverlays().add(mCompassOverlay);
    mMap.getOverlays().add(mScaleBarOverlay);
}
 

import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; //导入依赖的package包/类
/**
 * Description:     Initialises the Map and sets initial options such as:
 * Zoom levels and controls
 * Compass
 * ScaleBar
 * Cluster Pin colors
 * Location update settings
 */
private void setUpMapIfNeeded() {

    // Check if we were successful in obtaining the map.
    mMap.setBuiltInZoomControls(true);
    mMap.setMultiTouchControls(true);
    mMap.setMinZoomLevel(3);
    mMap.setMaxZoomLevel(19); // Latest OSM can go to 21!
    mMap.getTileProvider().createTileCache();
    mCompassOverlay = new CompassOverlay(getActivity(), new InternalCompassOrientationProvider(getActivity()), mMap);

    ScaleBarOverlay mScaleBarOverlay = new ScaleBarOverlay(getActivity());
    mScaleBarOverlay.setScaleBarOffset(getResources().getDisplayMetrics().widthPixels / 2, 10);
    mScaleBarOverlay.setCentred(true);

    // Sets cluster pin color
    mCellTowerGridMarkerClusterer = new CellTowerGridMarkerClusterer(getActivity());
    BitmapDrawable mapPinDrawable = (BitmapDrawable) getResources().getDrawable(R.drawable.ic_map_pin_orange);
    mCellTowerGridMarkerClusterer.setIcon(mapPinDrawable == null ? null : mapPinDrawable.getBitmap());

    GpsMyLocationProvider gpsMyLocationProvider = new GpsMyLocationProvider(getActivity().getBaseContext());
    gpsMyLocationProvider.setLocationUpdateMinDistance(100); // [m]  // Set the minimum distance for location updates
    gpsMyLocationProvider.setLocationUpdateMinTime(10000);   // [ms] // Set the minimum time interval for location updates
    mMyLocationOverlay = new MyLocationNewOverlay(getActivity().getBaseContext(), gpsMyLocationProvider, mMap);
    mMyLocationOverlay.setDrawAccuracyEnabled(true);

    mMap.getOverlays().add(mCellTowerGridMarkerClusterer);
    mMap.getOverlays().add(mMyLocationOverlay);
    mMap.getOverlays().add(mCompassOverlay);
    mMap.getOverlays().add(mScaleBarOverlay);
}
 

import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; //导入依赖的package包/类
/**
 * Description:     Initialises the Map and sets initial options such as:
 * Zoom levels and controls
 * Compass
 * ScaleBar
 * Cluster Pin colors
 * Location update settings
 */
private void setUpMapIfNeeded() {

    // Check if we were successful in obtaining the map.
    mMap.setBuiltInZoomControls(true);
    mMap.setMultiTouchControls(true);
    mMap.setMinZoomLevel(3);
    mMap.setMaxZoomLevel(19); // Latest OSM can go to 21!
    mMap.getTileProvider().createTileCache();
    mCompassOverlay = new CompassOverlay(this, new InternalCompassOrientationProvider(this), mMap);

    ScaleBarOverlay mScaleBarOverlay = new ScaleBarOverlay(this);
    mScaleBarOverlay.setScaleBarOffset(getResources().getDisplayMetrics().widthPixels / 2, 10);
    mScaleBarOverlay.setCentred(true);

    // Sets cluster pin color
    mCellTowerGridMarkerClusterer = new CellTowerGridMarkerClusterer(MapViewerOsmDroid.this);
    BitmapDrawable mapPinDrawable = (BitmapDrawable) getResources().getDrawable(R.drawable.ic_map_pin_orange);
    mCellTowerGridMarkerClusterer.setIcon(mapPinDrawable == null ? null : mapPinDrawable.getBitmap());

    GpsMyLocationProvider gpsMyLocationProvider = new GpsMyLocationProvider(MapViewerOsmDroid.this.getBaseContext());
    gpsMyLocationProvider.setLocationUpdateMinDistance(100); // [m]  // Set the minimum distance for location updates
    gpsMyLocationProvider.setLocationUpdateMinTime(10000);   // [ms] // Set the minimum time interval for location updates
    mMyLocationOverlay = new MyLocationNewOverlay(MapViewerOsmDroid.this.getBaseContext(), gpsMyLocationProvider, mMap);
    mMyLocationOverlay.setDrawAccuracyEnabled(true);

    mMap.getOverlays().add(mCellTowerGridMarkerClusterer);
    mMap.getOverlays().add(mMyLocationOverlay);
    mMap.getOverlays().add(mCompassOverlay);
    mMap.getOverlays().add(mScaleBarOverlay);
}
 

import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; //导入依赖的package包/类
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
	fragmentView = (LinearLayout) inflater.inflate(R.layout.main, container, false);

	layout1 = (LinearLayout) fragmentView.findViewById(R.id.linearLayout1);
	layout2 = (LinearLayout) fragmentView.findViewById(R.id.linearLayout2);
	layout4 = (LinearLayout) fragmentView.findViewById(R.id.linearLayout4);
	layout5 = (LinearLayout) fragmentView.findViewById(R.id.linearLayout5);

	defineWidgets(fragmentView);

	if (savedInstanceState != null)
		chrono.setBase(chronoBaseValue);

	chrono.setOnChronometerTickListener(new OnChronometerTickListener() {
		public void onChronometerTick(Chronometer arg0) {
			showCalculatedData(arg0);

			if (prefs.getInt("practice_display5", TypesOfPractices.BASIC_PRACTICE.getTypes()) == TypesOfPractices.HIIT_PRACTICE
					.getTypes())
				showHiitTrainingDataInDisplay(arg0);
		}
	});

	mapView = (MapView) fragmentView.findViewById(R.id.practice_mapview);
	mapView.getOverlays().clear();
	mapView.setBuiltInZoomControls(true);
	mapView.setMultiTouchControls(true);
	mapView.setUseSafeCanvas(true);

	setHardwareAccelerationOff();

	mapController = (MapController) mapView.getController();

	ScaleBarOverlay mScaleBarOverlay = new ScaleBarOverlay(mContext);
	mapView.getOverlays().add(mScaleBarOverlay);

	pathOverlay = new PathOverlay(Color.BLUE, mContext);
	pathOverlay.getPaint().setStyle(Style.STROKE);
	pathOverlay.getPaint().setStrokeWidth(3);
	pathOverlay.getPaint().setAntiAlias(true);
	mapView.getOverlays().add(pathOverlay);

	this.mCompassOverlay = new CompassOverlay(mContext, new InternalCompassOrientationProvider(mContext),
			mapView);
	mCompassOverlay.setEnabled(true);
	mapView.getOverlays().add(mCompassOverlay);

	this.mLocationOverlay = new MyLocationNewOverlay(mContext, new GpsMyLocationProvider(mContext),
			mapView);
	mLocationOverlay.setDrawAccuracyEnabled(true);
	mapView.getOverlays().add(mLocationOverlay);

	MapOverlay touchOverlay = new MapOverlay(mContext);
	mapView.getOverlays().add(touchOverlay);

	mLocationOverlay.runOnFirstFix(new Runnable() {
		public void run() {
			if (centerPoint == null)
				centerPoint = mLocationOverlay.getMyLocation();

			centerMyLocation(centerPoint);
		}
	});

	mapView.postInvalidate();

	return fragmentView;
}
 

import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; //导入依赖的package包/类
protected void addOverlays() {
    //sorry for the spaghetti code this is to filter out the compass on api 8
    //Note: the compass overlay causes issues on API 8 devices. See https://github.com/osmdroid/osmdroid/issues/218
    if (Build.VERSION.SDK_INT > Build.VERSION_CODES.FROYO) {
        mCompassOverlay = new CompassOverlay(getContext(), new InternalCompassOrientationProvider(getContext()),
                mMapView);
        mCompassOverlay.enableCompass();
        mMapView.getOverlays().add(this.mCompassOverlay);
    }
}
 

import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; //导入依赖的package包/类
@Override
public void onResume() {
    super.onResume();
    //sorry for the spaghetti code this is to filter out the compass on api 8
    //Note: the compass overlay causes issues on API 8 devices. See https://github.com/osmdroid/osmdroid/issues/218

    if (mCompassOverlay != null) {
        //this call is needed because onPause, the orientation provider is destroyed to prevent context leaks
        this.mCompassOverlay.setOrientationProvider(new InternalCompassOrientationProvider(getActivity()));
        this.mCompassOverlay.enableCompass();
    }

}
 

import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; //导入依赖的package包/类
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_starter_mapview);

    Intent intent = getIntent();
    //if (intent)
    final double lat1 = 25.633;
    final double long1 = 71.094;

    //super important. Many tile servers, including open street maps, will BAN applications by user
    //agent. Do not use the sample application's user agent for your app! Use your own setting, such
    //as the app id.
    Configuration.getInstance().setUserAgentValue(getPackageName());

    mMapView = (MapView) findViewById(R.id.mapview);
    mMapView.setTileSource(TileSourceFactory.MAPNIK);


    mCompassOverlay = new CompassOverlay(this, new InternalCompassOrientationProvider(this),
            mMapView);
    mCompassOverlay.enableCompass();
    mMapView.getOverlays().add(this.mCompassOverlay);

    addOverlays();

    GeoPoint startPoint = new GeoPoint(lat1, long1);
    IMapController mapController = mMapView.getController();
    mapController.setZoom(9);
    mapController.setCenter(startPoint);
    Marker startMarker = new Marker(mMapView);
    startMarker.setPosition(startPoint);
    startMarker.setAnchor(Marker.ANCHOR_CENTER, Marker.ANCHOR_BOTTOM);
    mMapView.getOverlays().add(startMarker);


    mMapView.invalidate();

}
 

import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; //导入依赖的package包/类
/**
 * Description:     Initialises the Map and sets initial options such as:
 *                      Zoom levels and controls
 *                      Compass
 *                      ScaleBar
 *                      Cluster Pin colors
 *                      Location update settings
 */
private void setUpMapIfNeeded() {

    // Check if we were successful in obtaining the map.
    mMap.setBuiltInZoomControls(true);
    mMap.setMultiTouchControls(true);
    mMap.setMinZoomLevel(3);
    mMap.setMaxZoomLevel(19); // Latest OSM can go to 21!
    mMap.getTileProvider().createTileCache();
    mCompassOverlay = new CompassOverlay(getActivity(), new InternalCompassOrientationProvider(getActivity()), mMap);

    ScaleBarOverlay mScaleBarOverlay = new ScaleBarOverlay(getActivity());
    mScaleBarOverlay.setScaleBarOffset(getResources().getDisplayMetrics().widthPixels / 2, 10);
    mScaleBarOverlay.setCentred(true);

    // Sets cluster pin color
    mCellTowerGridMarkerClusterer = new CellTowerGridMarkerClusterer(getActivity());
    //BitmapDrawable mapPinDrawable = (BitmapDrawable) getResources().getDrawable(R.drawable.ic_map_pin_orange);
    BitmapDrawable mapPinDrawable = (BitmapDrawable) ResourcesCompat.getDrawable(getResources(), R.drawable.ic_map_pin_orange, null);
    mCellTowerGridMarkerClusterer.setIcon(mapPinDrawable == null ? null : mapPinDrawable.getBitmap());

    GpsMyLocationProvider gpsMyLocationProvider = new GpsMyLocationProvider(getActivity().getBaseContext());
    gpsMyLocationProvider.setLocationUpdateMinDistance(100); // [m]  // Set the minimum distance for location updates
    gpsMyLocationProvider.setLocationUpdateMinTime(10000);   // [ms] // Set the minimum time interval for location updates
    mMyLocationOverlay = new MyLocationNewOverlay(getActivity().getBaseContext(), gpsMyLocationProvider, mMap);
    mMyLocationOverlay.setDrawAccuracyEnabled(true);

    mMap.getOverlays().add(mCellTowerGridMarkerClusterer);
    mMap.getOverlays().add(mMyLocationOverlay);
    mMap.getOverlays().add(mCompassOverlay);
    mMap.getOverlays().add(mScaleBarOverlay);
}
 

import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; //导入依赖的package包/类
public void refreshLocationsOnMap(){
    map.getOverlays().clear();
    map.invalidate();

    placeMarkers.clear();
    allPlaces = Place.getAll();


    for(Place place: allPlaces){
        OverlayItem placeOverlayItem = new OverlayItem(
                place.getAddress(), place.getDescription(), new GeoPoint(place.getLatitude(), place.getLongitude()));
        Drawable myCurrentLocationMarker = this.getResources().getDrawable(R.drawable.marker_cloud);
        placeOverlayItem.setMarker(myCurrentLocationMarker);
        placeMarkers.add(placeOverlayItem);
    }


    // add my current location overlay
    if(currentLocation != null){
        OverlayItem myLocationOverlayItem = new OverlayItem("Here", "Current location",
                new GeoPoint(currentLocation.getLatitude(), currentLocation.getLongitude()));
        myLocationOverlayItem.setMarkerHotspot(OverlayItem.HotspotPlace.CENTER);
        placeMarkers.add(myLocationOverlayItem);
    }


    ItemizedIconOverlay<OverlayItem> anotherItemizedIconOverlay
            = new ItemizedIconOverlay<OverlayItem>(
            getActivity(), placeMarkers, null);
    map.getOverlays().add(anotherItemizedIconOverlay);


    ScaleBarOverlay myScaleBarOverlay = new ScaleBarOverlay(map);
    map.getOverlays().add(myScaleBarOverlay);

    MyLocationNewOverlay mLocationOverlay = new MyLocationNewOverlay(new GpsMyLocationProvider(getActivity()), map);
    map.getOverlays().add(mLocationOverlay);

    CompassOverlay mCompassOverlay = new CompassOverlay(getActivity(), new InternalCompassOrientationProvider(getActivity()), map);
    map.getOverlays().add(mCompassOverlay);

    /*RotationGestureOverlay mRotationGestureOverlay = new RotationGestureOverlay(getActivity(), map);
    mRotationGestureOverlay.setEnabled(true);
    map.setMultiTouchControls(true);
    map.getOverlays().add(mRotationGestureOverlay);*/


    setBoundingBox();

}
 

import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; //导入依赖的package包/类
@Override
public void onActivityCreated(Bundle savedInstanceState) {
     super.onActivityCreated(savedInstanceState);

     final Context context = this.getActivity();
     final DisplayMetrics dm = context.getResources().getDisplayMetrics();
     // mResourceProxy = new ResourceProxyImpl(getActivity().getApplicationContext());

     mPrefs = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);

     this.mLocationOverlay = new MyLocationNewOverlay(new GpsMyLocationProvider(context),
          mMapView);

     mMinimapOverlay = new MinimapOverlay(context, mMapView.getTileRequestCompleteHandler());
     mMinimapOverlay.setWidth(dm.widthPixels / 5);
     mMinimapOverlay.setHeight(dm.heightPixels / 5);


     mCopyrightOverlay = new CopyrightOverlay(context);

    //i hate this very much, but it seems as if certain versions of android and/or
    //device types handle screen offsets differently
    if (Build.VERSION.SDK_INT <= 10)
        mCopyrightOverlay.setOffset(0,(int)(55*dm.density));

     mScaleBarOverlay = new ScaleBarOverlay(mMapView);
     mScaleBarOverlay.setCentred(true);
     mScaleBarOverlay.setScaleBarOffset(dm.widthPixels / 2, 10);

     mRotationGestureOverlay = new RotationGestureOverlay(mMapView);
     mRotationGestureOverlay.setEnabled(true);

     mMapView.setBuiltInZoomControls(true);
     mMapView.setMultiTouchControls(true);

     mMapView.setTilesScaledToDpi(false);
     mMapView.getOverlays().add(this.mLocationOverlay);
     mMapView.getOverlays().add(this.mCopyrightOverlay);

     mMapView.getOverlays().add(this.mMinimapOverlay);
     mMapView.getOverlays().add(this.mScaleBarOverlay);
     mMapView.getOverlays().add(this.mRotationGestureOverlay);

     final float zoomLevel = mPrefs.getFloat(PREFS_ZOOM_LEVEL_DOUBLE, mPrefs.getInt(PREFS_ZOOM_LEVEL, 1));
     mMapView.getController().setZoom(zoomLevel);
     final float orientation = mPrefs.getFloat(PREFS_ORIENTATION, 0);
     mMapView.setMapOrientation(orientation, false);
     final String latitudeString = mPrefs.getString(PREFS_LATITUDE_STRING, null);
     final String longitudeString = mPrefs.getString(PREFS_LONGITUDE_STRING, null);
     if (latitudeString == null || longitudeString == null) { // case handled for historical reasons only
         final int scrollX = mPrefs.getInt(PREFS_SCROLL_X, 0);
         final int scrollY = mPrefs.getInt(PREFS_SCROLL_Y, 0);
         mMapView.scrollTo(scrollX, scrollY);
     } else {
         final double latitude = Double.valueOf(latitudeString);
         final double longitude = Double.valueOf(longitudeString);
         mMapView.setExpectedCenter(new GeoPoint(latitude, longitude));
     }

     mLocationOverlay.enableMyLocation();

    //sorry for the spaghetti code this is to filter out the compass on api 8
    //Note: the compass overlay causes issues on API 8 devices. See https://github.com/osmdroid/osmdroid/issues/218
     if (Build.VERSION.SDK_INT > Build.VERSION_CODES.FROYO) {
         mCompassOverlay = new CompassOverlay(context, new InternalCompassOrientationProvider(context),
                 mMapView);
         mCompassOverlay.enableCompass();
         mMapView.getOverlays().add(this.mCompassOverlay);
     }

     setHasOptionsMenu(true);
}