如何在Android中获得经度和纬度

概述我想找到我当前位置的经度和纬度,但我一直得到NULL.doublelat=loc.getLatitude();//Causetheresultisnull,socan'tknowlongitudeandlatitudedoublelng=loc.getLongitude();LocationManagerlocationManager=(LocationManager)this.getSystemService(Con

我想找到我当前位置的经度和纬度,但我一直得到NulL.

double lat = loc.getLatitude(); //Cause the result is null, so can't kNow longitude and latitudedouble lng = loc.getLongitude(); LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);      String provIDer = LocationManager.GPS_PROVIDER;      Location location = locationManager.getLastKNownLocation(provIDer); //result is null!

这是获取GPS状态的代码.它工作正常：

public voID onGpsstatusChanged(int event) { // get the GPS statue                  LocationManager locationManager = (LocationManager) GpsActivity.this.getSystemService(Context.LOCATION_SERVICE);                  Gpsstatus status = locationManager.getGpsstatus(null);                  String satelliteInfo = updateGpsstatus(event, status);                myTextVIEw.setText(satelliteInfo);//work fine ,searched satellite:16    }    };        private String updateGpsstatus(int event, Gpsstatus status) {              StringBuilder sb2 = new StringBuilder("");              if (status == null) {                  sb2.append("searched satellite number" +0);              } else if (event == Gpsstatus.GPS_EVENT_SATELliTE_STATUS) {                  int maxSatellites = status.getMaxSatellites();                  Iterator<GpsSatellite> it = status.getSatellites().iterator();                  numSatelliteList.clear();                  int count = 0;                  while (it.hasNext() && count <= maxSatellites) {                      GpsSatellite s = it.next();                      numSatelliteList.add(s);                      count++;                  }                  sb2.append("searched satellite number:" + numSatelliteList.size());              }            return sb2.toString();          }

解决方法:

getLastKNownLocation()仅返回最近的GPS修复(如果可用).您需要实现LocationListener并使用LocationManager#requestLocationUpdates()来获取新位置.

基本实施：

public class Example extends Activity implements LocationListener {    LocationManager mLocationManager;    @OverrIDe    public voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.main);        mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);        Location location = mLocationManager.getLastKNownLocation(LocationManager.GPS_PROVIDER);        if(location != null) {            // Do something with the recent location fix            //  otherwise wait for the update below        }        else {            mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);        }    }    @OverrIDe    public voID onLocationChanged(Location location) {        if (location != null) {            Log.v("Location Changed", location.getLatitude() + " and " + location.getLongitude());        }    }    // etc..}

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