Question

我正在开发一个Android应用程序，我想向用户显示附近区域到他的位置。不幸的是，当我从GoogleMaps获取地图数据时，它向我展示了整个世界，只显示了当前位置的一个点，我需要继续放大。我尝试将缩放系数设置为100，但这并没有改变任何东西。有什么我做错了。请告诉我。

这是我的代码：

   public class MapsActivitiyFragment extends FragmentActivity implements LocationListener {

   static GoogleMap googleMap;

    LocationManager locationManager;
    String provider;
    LatLng myPosition;


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

        SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.googleMap);
        googleMap = fm.getMap();
        googleMap.setMyLocationEnabled(true);
        locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        Criteria criteria = new Criteria();
        provider = locationManager.getBestProvider(criteria, true);
        Location location = locationManager.getLastKnownLocation(provider);
        if (location != null) {
            circleDraw(location.getLatitude(),location.getLongitude());
            zoomIn(location.getLatitude(), location.getLatitude());
            onLocationChanged(location);

        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        locationManager.requestLocationUpdates(provider, 400, 1, this);
    }

    public void circleDraw(double i, double ii) {

        googleMap.addCircle(new CircleOptions().center(new LatLng(i, ii))
                .radius(10000).strokeColor(Color.BLACK).strokeWidth(5)
                .fillColor(Color.argb(50, 238, 116, 116)));
    }

    public void zoomIn(double Lat, double Long) {

        CameraUpdate center = CameraUpdateFactory.newLatLng(new LatLng(Lat,
                Long));
        CameraUpdate zoom = CameraUpdateFactory.zoomTo(15);
        googleMap.moveCamera(center);
        googleMap.animateCamera(zoom);

    }

    @Override
    public void onLocationChanged(Location location) {
        googleMap.clear();// clean the map
        Toast.makeText(this, "Location Changed", Toast.LENGTH_SHORT).show();
        double latitude = location.getLatitude();
        double longitude = location.getLongitude();
        myPosition = new LatLng(latitude, longitude);

        circleDraw(latitude, longitude);
        zoomIn(latitude, longitude);
    }

    @Override
    public void onProviderDisabled(String arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderEnabled(String arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
        // TODO Auto-generated method stub

    }

}

更新

图片：

Answer 1

请记住，当您的位置发生变化时，会调用onLocationChanged。如果你停滞不前，你可能会遇到问题，当你在模拟器上工作时，你会遇到很多问题。

您的代码看起来很好。如果您设置地图，请设置缩放位置。不要在onLocationChanged中设置它在我的代码中我会将缩放设置为onCreate

//编辑

LatLng center = new LatLng(location.getLatitude(), location.getLongitude());
CameraPosition.Builder cameraPosition = new CameraPosition.Builder();
cameraPosition.target(center);
cameraPosition.zoom((int)configuration.get("zoom"));
map.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition.build()));

Android：使用com.google.android.gms.maps.GoogleMap为区域设置默认缩放级别

1 个答案: