gps

问题 From the following code, I get the current location. Criteria criteria = new Criteria(); criteria.setAccuracy(Criteria.ACCURACY_FINE); criteria.setAltitudeRequired(false); criteria.setBearingRequired(false); criteria.setCostAllowed(true); criteria.setPowerRequirement(Criteria.POWER_LOW); String provider = locationManager.getBestProvider(criteria, true); GlobalLocation = locationManager.getLastKnownLocation(provider); locationManager.requestLocationUpdates(provider, 2000, 10, locationListener)

问题 I got a force close when I tried to stop my gsp listener Here's the code: mlocManager.removeUpdates(mlocListener); mlocManager = null; and this: LocationManager mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); LocationListener mlocListener = new MyLocationListener(); mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, (long) update, 0, mlocListener); Please help me, I don't understand why it force closes. 07-30 11:43:39.557: D/AndroidRuntime(1071):

问题 I would like to have the possibility to tell if a GPS location is in an inhabited or uninhabited zone. I have tried some reverse geocoding services out there, but all of them proved useless, because they select the nearest address possible. (I understand why this should be so, it is useful for the purpose of reverse geocoding) I have noticed in Google Maps , when I search for a city, their boundaries are selected in red dotted well defined line. I would love it to use this, or something

问题 Is there a way to be notified when the GPS is switched on/off? I noticed that when the device is switched off an then on again, getLastKnownLocation(provider) is null. So I want to save the location when the GPS is switched off to a database. 回答1: Register a BroadcastReceiver to listen for the LocationManager's PROVIDERS_CHANGED_ACTION Intent. This will be broadcast when the GPS provider (and other providers) is enabled / disabled. 来源： https://stackoverflow.com/questions/11446428/broadcast

问题 I want to get current location (latitude & longitude) , when WiFi & Gps is off .It is possible to get latitude and longitude from mobile sim network. I searched more on google but i did not get satisfies answers. 回答1: Try This LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE); Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER); if(location==null){ location = lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); } 回答2: From my

问题 I want to get the city /settlement at a specific gps location. meaning the closest one in a given range or at best the closest. i found some example queries in the wikimedia data examples. I try to adopt then but i get only errors or timeouts here is my current query: SELECT * WHERE { ?city wdt:P31/wdt:P279* wd:Q15642541 . // only settlements # Search by Nearest SERVICE wikibase:around { ?place wdt:P625 ?location . bd:serviceParam wikibase:center "Point(8.4024875340491 48.9993762209831)"^^geo

问题 I have somme probleme to detect GPS switch turn on/off. I can detect GPS switch on but Toasts draws always on my screen. I have "GPS enabled" "GPS disabled" "GPS enabled" "GPS disabled" "GPS enabled" "GPS disabled" "GPS enabled" ... There is my code : final LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE); locationManager.addGpsStatusListener(new GpsStatus.Listener() { @Override public void onGpsStatusChanged(int event) { switch (event) {

问题 i am using GPS to calculate distance between two points i.e. i am using windows phone as a tape measure but when i start i dont get the correct value infact even if i am standing still it gives me hundreds of meter here is my code myWatcher.StatusChanged += new EventHandler<GeoPositionStatusChangedEventArgs>(myWatcher_StatusChanged); myWatcher.PositionChanged += new EventHandler<GeoPositionChangedEventArgs<GeoCoordinate>>(myWatcher_PositionChanged); myWatcher.MovementThreshold = 1; void

问题 knowing a decimal latitude , decimal longitude , speed (km/h) , heading how to find the next position of a car after 60 seconds? is there any algorithm to do that? 回答1: This might help: distance_traveled = speed * time Then, calculate x and y components of speed using heading as angle (trigonometry): speed_x=distance_traveled * Math.Cos(heading/180*Math.PI) speed_y=distance_traveled * Math.Sin(heading/180*Math.PI) Next, see how to map lat/long into some form of x/y coordinates, add speed_x

问题 knowing a decimal latitude , decimal longitude , speed (km/h) , heading how to find the next position of a car after 60 seconds? is there any algorithm to do that? 回答1: This might help: distance_traveled = speed * time Then, calculate x and y components of speed using heading as angle (trigonometry): speed_x=distance_traveled * Math.Cos(heading/180*Math.PI) speed_y=distance_traveled * Math.Sin(heading/180*Math.PI) Next, see how to map lat/long into some form of x/y coordinates, add speed_x