I am developing an Android application where I need to check whether a GPS point lie inside a region (or polygon). I am therefore planning to use Polygon class provided by Google Maps. But, this require a map view to construct a polygon. I don't want to use a map view. Kindly tell if there is a class or some API by which polygon can be used. I have come to know of a PolyUtil class but it requires importing another library.
Thanks,
Arpit
Use this lib android-maps-utils:
PolyUtil.containsLocation(LatLng point, java.util.List<LatLng> polygon, boolean geodesic)
Related
I am using google direction API to generate the Polygon. I have also used below methods of map utils but not get desired solution
PolyUtil.isLocationOnEdge(pbmLocation,poly,false)
PolyUtil.containsLocation(pbmLocation,poly,false)
PolyUtil.distanceToLine(pbmLocation, startLocation, destLocation)
I would like to use google map API to get a map canvas to put objects on it, but not showing the map, by using the maptype NONE.
Am I allowed to do that in an Android app using v2 and distribute it?
This is what I want to do:
#Override
public void onMapReady(GoogleMap map) {
map.moveCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(-18.142, 178.431), 2));
// Other supported types include: MAP_TYPE_NORMAL,
// MAP_TYPE_TERRAIN, MAP_TYPE_HYBRID and MAP_TYPE_SATELLITE
map.setMapType(GoogleMap.MAP_TYPE_NONE);
}
I want to set map.setMapType(GoogleMap.MAP_TYPE_NONE); and then add various markers to the map, including my current position
Added a picture to show what I want to achieve.
As mentioned in Google documentation it's forbidden. More over - From what you are saying it seems that you want use gmaps capabilities to get data and calculations but actually display some thing else. I really don't think it's good idea. However - if the issue is making geo calculations, consider to use 3'rd party open source libs for this. For example http://www.gavaghan.org/blog/free-source-code/geodesy-library-vincentys-formula-java/
I have yandex.yandexmapkit.MapView. I want to create the screenshot from it.
How can I get screenshot from yandex map kit?
There are two ways.
First one is using the static Yandex map API (sometimes you aren't need to use complex Mapkit):
http://static-maps.yandex.ru/1.x/?lang=ru-RU&ll=32.810152,39.889847&size=450,450&z=10&l=map
The second way is drawing MapView into Bitmap and it's not difficult.
If you don't wanna use static Yandex map API, you can use MapView.getScreenshot() method.
Also, if this method returns null, well, in short, you should try adding xml attributeapp:movable="true" to your MapView.
I'm developing a android application with google maps v2 that draw polygons on the google maps. But now i have to identify a click on a certain polygon and popup a window.
I found this useful library on github
This library has the method containsLocation implemented. This method receives a LatLng (from click on the map) and a List (the polygon). This is fine but if i have 1 million polygon in the map i cant iterate all and test if a certain LatLng belongs to a certain Polygon. I remember that i can use a quadtree to get more performance and this library also implements a quadtree but it uses point. What is the best way of doing this? May i have to reimplement this quadtree for a quadtree of LatLng ? Or in each click i have to convert this click to a point and search on a point quadtree?
Regards
you cannot use a Point- Quadtree, you need an Object-Quadtree for your Polygons. An object quadree uses the bounding box of the polygon or any object for adding into the tree.
you dont need to consider latLong, use x,y with x= longitude, and y = Latitude.
Consider reading Hanan Sammet: Foundations of multidimensional data structures.
I think you need to implement a quadtree that stores the polygons, then query the tree to see which polygon (if any) contains the LatLng. If you search around I'm sure you can find a decent implementation.
I am developing a GoogleMap based android application.
I need to display 1000's of Markers on the map.
Currently I retrieve the Latitude and Longitude for each marker from an SQLite database loader and add the markers in the public void onLoadFinished(final Loader loader, final Cursor cursor) method.
this approach gives a very bad user experience though, as the application does not respond while i add the Markers.
how can i add 1000's of markers to a googlemap and keep my application responsive?
as i have to add the markers to the map on the main UI thread.
One possible way is to only add Markers when they fall into visible region of the map.
You would actually have to move your calls to addMarker from onLoadFinished to onCameraChange and in onLoadFinished only create a list of data needed to create these Markers. In the simplest form this might be List<MarkerOptions>.
Android Maps Extensions mentioned by Lalit Poptani in the comments above can handle that for you even if you don't want to use clustering. You simply leave your code like it is and only make a call like
googleMap.setClustering(new ClusteringSettings().enabled(false).addMarkersDynamically(true));
after replacing Google Maps Android API v2 with this extensions lib.
You can use Spatial Lite provider with geoserver to provide WMS maps.
In android you can set a tile provider to consuming such tile maps.