android - 如何从android中的kml文件获取数组点

Question

我有 kml 文件，我用 KmlLayer 类将它显示在我的 map 中。 (它是显示在 map 中的多边形形状)现在我需要检查用户位置是否在多边形中。如何获取多边形的坐标并检查用户是否在其中？

这是 map Activity

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, LocationListener {

private GoogleMap mMap;
private  LocationManager manager;
private double lat, lng;
private KmlLayer layer;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps);
    // Obtain the SupportMapFragment and get notified when the map is ready to be used.
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);
    manager = (LocationManager) getSystemService(LOCATION_SERVICE);

}

@Override
protected void onResume() {
    super.onResume();
    String provider = LocationManager.GPS_PROVIDER;

    try {
        manager.requestLocationUpdates(provider, 1000, 100, this);
    }catch (SecurityException e){

    }
}

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;

}


@Override
public void onLocationChanged(Location location) {
    // Add a marker in user location

    mMap.clear();
    try {
        layer = new KmlLayer(mMap, R.raw.polygon_layer, this);
        layer.addLayerToMap();

    } catch (IOException e) {
        e.printStackTrace();
    } catch (XmlPullParserException e) {
        e.printStackTrace();
    }

    lat = location.getLatitude();
    lng = location.getLongitude();
    LatLng userLocation = new LatLng(lat , lng );
    mMap.addMarker(new MarkerOptions().position(userLocation).title("you are here"));
    mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(userLocation, 15));
/////do somethig thith the results.../////
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {

}

@Override
public void onProviderEnabled(String provider) {

}

@Override
public void onProviderDisabled(String provider) {

  }
}

这是xml中的kml文件

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom">
<Document>
    <name>Allowed area.kml</name>
    <Style id="s_ylw-pushpin_hl">
        <IconStyle>
            <scale>1.3</scale>
            <Icon>
                <href>http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png</href>
            </Icon>
            <hotSpot x="20" y="2" xunits="pixels" yunits="pixels"/>
        </IconStyle>
    </Style>
    <StyleMap id="m_ylw-pushpin">
        <Pair>
            <key>normal</key>
            <styleUrl>#s_ylw-pushpin</styleUrl>
        </Pair>
        <Pair>
            <key>highlight</key>
            <styleUrl>#s_ylw-pushpin_hl</styleUrl>
        </Pair>
    </StyleMap>
    <Style id="s_ylw-pushpin">
        <IconStyle>
            <scale>1.1</scale>
            <Icon>
                <href>http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png</href>
            </Icon>
            <hotSpot x="20" y="2" xunits="pixels" yunits="pixels"/>
        </IconStyle>
    </Style>
    <Placemark>
        <name>Allowed area</name>
        <styleUrl>#m_ylw-pushpin</styleUrl>
        <Polygon>
            <tessellate>1</tessellate>
            <outerBoundaryIs>
                <LinearRing>
                    <coordinates>
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                    </coordinates>
                </LinearRing>
            </outerBoundaryIs>
        </Polygon>
    </Placemark>
</Document>
</kml>

谢谢

Answer 1

您可以访问图层地标并获取其几何图形。如果它是多边形，您可以检查用户位置是否位于多边形内部(考虑到多边形可能有孔，您需要检查位置是否位于孔上，这意味着多边形不包含该位置)。

递归地检查该位置是否位于文件的任何容器中的任何多边形内。

LatLng latLngTest; // The location to test. You will initialize it with your user's location
List<KmlPolygon> polygonsInLayer = getPolygons(layer.getContainers());
boolean liesInside = liesOnPolygon(polygonsInLayer, latLngTest);

private List<KmlPolygon> getPolygons(Iterable<KmlContainer> containers) {
    List<KmlPolygon> polygons = new ArrayList<>();

    if (containers == null) {
        return polygons;
    }

    for (KmlContainer container : containers) {
        polygons.addAll(getPolygons(container));
    }

    return polygons;
}

private List<KmlPolygon> getPolygons(KmlContainer container) {
    List<KmlPolygon> polygons = new ArrayList<>();

    if (container == null) {
        return polygons;
    }

    Iterable<KmlPlacemark> placemarks = container.getPlacemarks();
    if (placemarks != null) {
        for (KmlPlacemark placemark : placemarks) {
            if (placemark.getGeometry() instanceof KmlPolygon) {
                polygons.add((KmlPolygon) placemark.getGeometry());
            }
        }
    }

    if (container.hasContainers()) {
        polygons.addAll(getPolygons(container.getContainers()));
    }

    return polygons;
}

private boolean liesOnPolygon(List<KmlPolygon> polygons, LatLng test) {
    boolean lies = false;

    if (polygons == null || test == null) {
        return lies;
    }

    for (KmlPolygon polygon : polygons) {
        if (liesOnPolygon(polygon, test)) {
            lies = true;
            break;
        }
    }

    return lies;
}

private boolean liesOnPolygon(KmlPolygon polygon, LatLng test) {
    boolean lies = false;

    if (polygon == null || test == null) {
        return lies;
    }

    // Get the outer boundary and check if the test location lies inside
    ArrayList<LatLng> outerBoundary = polygon.getOuterBoundaryCoordinates();
    lies = PolyUtil.containsLocation(test, outerBoundary, true);

    if (lies) {
        // Get the inner boundaries and check if the test location lies inside
        ArrayList<ArrayList<LatLng>> innerBoundaries = polygon.getInnerBoundaryCoordinates();
        if (innerBoundaries != null) {
            for (ArrayList<LatLng> innerBoundary : innerBoundaries) {
                // If the test location lies in a hole, the polygon doesn't contain the location
                if (PolyUtil.containsLocation(test, innerBoundary, true)) {
                    lies = false;
                    break;
                }
            }
        }
    }

    return lies;
}