[英]Grabbing user location with google maps v2 on android?
I want to place a marker in the map each time the location changes. 每当位置更改时,我都希望在地图上放置一个标记。 I am grabbing the Lat and Long from the
Location
and creating a marker within the onLocationChanged()
method. 我要从
Location
抓取纬度和经度,并在onLocationChanged()
方法内创建一个标记。 Why doesn't the marker get created? 为什么没有创建标记?
public class MainActivity extends FragmentActivity implements LocationListener
{
Context context = this;
GoogleMap googlemap;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initMap();
addTwittertoMap();
LocationManager lm = (LocationManager) getSystemService(LOCATION_SERVICE);
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10000, 0,
this);
String provider = lm.getBestProvider(new Criteria(), true);
}
public void onLocationChanged(Location location) {
LatLng current = new LatLng(location.getLatitude(), location.getLatitude());
Date date = new Date();
googlemap.addMarker(new MarkerOptions()
.title("Current Pos")
.snippet(new Timestamp(date.getTime()).toString())
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE))
.position(current)
);
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
public void onProviderEnabled(String provider) {
}
public void onProviderDisabled(String provider) {
}
private void initMap(){
SupportMapFragment mf = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
googlemap = mf.getMap();
googlemap.setMyLocationEnabled(true);
googlemap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
}
LatLng current = new LatLng(location.getLatitude(), location.getLatitude());
should be LatLng current = new LatLng(location.getLatitude(), location.getLongitude());
应该是
LatLng current = new LatLng(location.getLatitude(), location.getLongitude());
Also, as an improvement to the configuration of the LocationManager, I'd suggest to setup it this way: 另外,作为对LocationManager的配置的改进,我建议以这种方式进行设置:
LocationManager lm = (LocationManager) getSystemService(LOCATION_SERVICE);
String provider = lm.getBestProvider(new Criteria(), true);
lm.requestLocationUpdates(provider, 10000, 0, this);
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