java - 无法使用 LocationManager 获取坐标

Question

我正在开发一个使用 Google Maps V2 API 的应用程序，但在获取坐标并将其放入 LatLng 对象中时遇到问题...这是我的代码:

 public class TelaMapa extends android.support.v4.app.FragmentActivity 
                  implements OnMapClickListener, OnCameraChangeListener{

// Google Map
protected GoogleMap googleMap;
private SupportMapFragment mapFragment;
protected AndroidLocationSource locationSource;

@Override
protected void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.activity_mapa);
}

@Override
protected void onResume(){
    super.onResume();
    configureMap();
}


/**
 * function to load map. If map is not created it will create it for you
 * */
private void configureMap() {
    if (googleMap == null) {
        mapFragment = (SupportMapFragment) getSupportFragmentManager()
                    .findFragmentById(R.id.map);

        googleMap = mapFragment.getMap();

        googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
        googleMap.setMyLocationEnabled(true);

        LocationManager LM = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        String bestProvider = LM.getBestProvider(new Criteria(),true);

        Location localAtu;

        /*Location myLocation = LM.getLastKnownLocation(bestProvider);

        double lat= myLocation.getLatitude();
        double lng = myLocation.getLongitude();
        LatLng latLng = new LatLng(lat, lng);

        googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 20));*/


        if(bestProvider != null){
            localAtu = LM.getLastKnownLocation(bestProvider);
        } else {
            localAtu = LM.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        }

        LatLng latLng;

        if(localAtu != null){
            latLng = new LatLng(localAtu.getLatitude(), localAtu.getLongitude());

            final CameraPosition position = new CameraPosition.Builder()
                                                              .target(latLng)
                                                              .bearing(0)
                                                              .tilt(0)
                                                              .zoom(17)
                                                              .build();

            CameraUpdate update = CameraUpdateFactory.newCameraPosition(position);
            googleMap.moveCamera(update);

            adicionarMarcador(googleMap, latLng);
            locationSource = new AndroidLocationSource();
            googleMap.setLocationSource(locationSource);
            locationSource.setLocation(latLng);
        } else {
            Toast.makeText(getApplicationContext(),
                           "GPS desligado ou indisponível!", Toast.LENGTH_LONG)
                           .show();
        }


        // check if map is created successfully or not
        if (googleMap == null) {
            Toast.makeText(getApplicationContext(),
                    "Desculpe! Não foi possível criar o mapa!", Toast.LENGTH_SHORT)
                    .show();
        }

   }
}

就是这样，我将它安装在我的摩托罗拉 Atrix 中，它总是向我显示其他内容中的 toast block ...感谢您的阅读!

Answer 1

Sanket Kachhela 回答!只要使用这个教程，它就会很好用!androidhive.info/2012/07/android-gps-location-manager-tutorial