我希望能够使用拖动监听器实现可编辑的多个多边形。我能够绘制多个多边形,但不知道如何使其可编辑。
我能够移动当前多边形的标记,但是当我尝试移动之前的多边形标记时,应用程序会崩溃。我尝试通过保存多边形列表来解决这个问题,但无法拖动标记。
请在此处查看我的代码。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (readyToGo()) {
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);
if (savedInstanceState == null) {
mapFragment.getMapAsync(this);
}
mapFragment.getMapAsync(this);
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
CameraUpdate center =
CameraUpdateFactory.newLatLng(new LatLng(40.76793169992044,
-73.98180484771729));
CameraUpdate zoom = CameraUpdateFactory.zoomTo(15);
mMap.moveCamera(center);
mMap.animateCamera(zoom);
mMap.setIndoorEnabled(false);
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng latLng) {
Marker marker = mMap.addMarker(new MarkerOptions().position(latLng).draggable(true));
marker.setTag(latLng);
markerList.add(marker);
points.add(latLng);
drawPolygon(points);
}
});
mMap.setOnMarkerDragListener(new GoogleMap.OnMarkerDragListener() {
@Override
public void onMarkerDragStart(Marker marker) {
}
@Override
public void onMarkerDrag(Marker marker) {
updateMarkerLocation(marker, false);
}
@Override
public void onMarkerDragEnd(Marker marker) {
updateMarkerLocation(marker, true);
}
});
}
public void closePolygon(View view) {
}
public void newPolygon(View view) {
//
points.clear();
markerList.clear();
polygon = null;
// mMap.clear();
}
private void updateMarkerLocation(Marker marker, boolean calculate) {
LatLng latLng = (LatLng) marker.getTag();
int position = points.indexOf(latLng);
points.set(position, marker.getPosition());
marker.setTag(marker.getPosition());
drawPolygon(points);
}
private void drawPolygon(List<LatLng> latLngList) {
if (polygon != null) {
polygon.remove();
}
polygonOptions = new PolygonOptions();
polygonOptions.addAll(latLngList);
polygon = mMap.addPolygon(polygonOptions);
}
}