Android 实时位置跟踪

Question

Hello everyone I am developing two apps one for Admin and second for its employees. Now i want to track the employee device using this app the location is send to server when location of employee device changed.Location is send only when location changed. how i can send location of device to server when location is changed?? second i want to show the location of employee on admin app map as it is changing its location.(May i send Location co ordinates from server to admin app through GCM or any other technique?)

Hey, down voters can you explain what is wrong in this question? If you have a Answer to the question the give otherwise try to understand the questions. please help Thanks in advance..

Answer 1

you can implement locationListener with service, you can req api from server and send data in any of form, json, xml and once you got the co-ordinates you can show them to the map.

LocationListener

android-location-based-services-example

Hope these can help you.

Answer 2

public LatLng getLocation()
{
 // Get the location manager
 MyLocationListener myLocListener = new MyLocationListener();
 LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
 Criteria criteria = new Criteria();
 String bestProvider = locationManager.getBestProvider(criteria, false);
 Location location = locationManager.getLastKnownLocation(bestProvider);
 locationManager.requestLocationUpdates(bestProvider,timeAfteryougetUpdate, minDistanceAfterYougetupdate, myLocListener);
 Double lat,lon;
 try {
   lat = location.getLatitude ();
   lon = location.getLongitude ();
   return new LatLng(lat, lon);
 }
 catch (NullPointerException e){
     e.printStackTrace();
   return null;
 }
}

**Use this to get location **

private class MyLocationListener implements LocationListener
  {
@Override
public void onLocationChanged(Location loc)
  {
  if (loc != null)
  {
     // Do something knowing the location changed by the distance you requested
     methodThatDoesSomethingWithNewLocation(loc);
  }
 }

 @Override
 public void onProviderDisabled(String arg0)
 {
   // Do something here if you would like to know when the provider is disabled by the user
 }

 @Override
 public void onProviderEnabled(String arg0)
 {
    // Do something here if you would like to know when the provider is enabled by the   user
  }

  @Override
 public void onStatusChanged(String arg0, int arg1, Bundle arg2)
 {
  // Do something here if you would like to know when the provider status changes
 }
 }

Answer 3

I know my response is a little bit late.

I will explain my answer using google maps services and firebase real-time database and Geo-Fire for easy location uploading to the cloud database.

1. Get the real-time location -

    @Override public void onMapReady(GoogleMap googleMap) { mMap = googleMap; locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE); if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { // add the code to get the permission return; } buildGoogleApiClient(); mMap.setMyLocationEnabled(true);

   }

    protected synchronized void buildGoogleApiClient(){ mGoogleApiClient = new GoogleApiClient.Builder(this) .addConnectionCallbacks(this) .addOnConnectionFailedListener(this) .addApi(LocationServices.API) .build(); mGoogleApiClient.connect();

   }

    @Override public void onConnected(@Nullable Bundle bundle) { mLocationRequest = new LocationRequest(); mLocationRequest.setPriority(LocationRequest.PRIORITY_LOW_POWER); if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { return; } LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);

   }

    @Override public void onLocationChanged(Location location) { if(getApplicationContext() != null) { mlasLocation = location; LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude()); // plot the realtime location on the map mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng)); mMap.animateCamera(CameraUpdateFactory.zoomTo(11)); addToDataBase(latLng); }

   }

2. Adding the real-time location to the cloud database using Geo-Fire

   public void addtoDataBase(LatLng location){ //unique name work like a promary key String uid = "119-userID"; final DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference("SOSRequests"); GeoFire geoFire = new GeoFire(databaseReference); geoFire.setLocation(uid, new GeoLocation(location.latitude, location.longitude));

   }