android maps api v2添加多个圆圈

问题描述

我正在尝试通过gps的更新每秒向地图添加一个圆圈.我将如何传递Location location = locationmanager.getLastKnownLocation(provider);每秒钟做一个新的圈子?这是我到目前为止所拥有的.

I'm trying to add a circle to the map every second with an update from the gps. How would I pass the Location location = locationmanager.getLastKnownLocation(provider); to make a new circle every second? Here is what I have so far.

public class MainActivity extends Activity implements LocationListener{

Location myLocation;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


GoogleMap mMap;
mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();


mMap.setMyLocationEnabled(true);





Location myLocation;

LocationManager locationmanager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria cr = new Criteria();
String provider = locationmanager.getBestProvider(cr, true);
Location location = locationmanager.getLastKnownLocation(provider);

locationmanager.requestLocationUpdates(provider, 1000, 0, (LocationListener) this);

CircleOptions circleOptions = new CircleOptions()
.center(new LatLng( , ))
.radius(3.048); // In meters

Circle circle = mMap.addCircle(circleOptions);



 }

}

推荐答案

最好使用LocationListener的回调:onLocationChange，而不是使用getLastKnownLocation，您似乎已经实现并请求了

Instead of using getLastKnownLocation, you are better of using LocationListener's callback: onLocationChange for that, which you seem to implement and request already.

要将Location转换为LatLng，请使用:

new LatLng(location.getLatitude(), location.getLongitude())

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