Wie Radius für Karten-Clustering in Android-Karten

Question

Ich bin ein Anfänger in Android-Entwicklung, und ich arbeite auf Android-Karten-Clustering, aber ich bin nicht in der Lage, Clustering Radius, bitte kann mir jemand helfen?

Beispiel: Ich möchte Marker innerhalb eines festen Entfernungsbereichs, z. Wenn ich Radius 1km gebe, sollten alle Marker innerhalb eines Kilometerbereichs gruppiert werden.

Ich beziehe mich diese library für Clustering Entwicklung

Answer 1

Sie unter Code verwenden Karte Clustering

 static int OFFSET = 268435456; 
       static double RADIUS = 85445659.4471; 
     static double pi = 3.1444; 

    public static double lonToX(double lon) { 
     return Math.round(OFFSET + RADIUS * lon * pi/180); 
    } 

    public static double latToY(double lat) { 
     return Math.round(OFFSET 
       - RADIUS 
       * Math.log((1 + Math.sin(lat * pi/180)) 
         /(1 - Math.sin(lat * pi/180)))/2); 
    } 

    public static int pixelDistance(double lat1, double lon1, double lat2, 
      double lon2, int zoom) { 
     double x1 = lonToX(lon1); 
     double y1 = latToY(lat1); 

     double x2 = lonToX(lon2); 
     double y2 = latToY(lat2); 

     return (int) (Math 
       .sqrt(Math.pow((x1 - x2), 2) + Math.pow((y1 - y2), 2))) >> (21 - zoom); 
    } 

    static ArrayList<Cluster> cluster(ArrayList<Marker> markers, int zoom) { 

     ArrayList<Cluster> clusterList = new ArrayList<Cluster>(); 

     ArrayList<Marker> originalListCopy = new ArrayList<Marker>(); 

     for (Marker marker : markers) { 
      originalListCopy.add(marker); 
     } 

     /* Loop until all markers have been compared. */ 
     for (int i = 0; i < originalListCopy.size();) { 

      /* Compare against all markers which are left. */ 

      ArrayList<Marker> markerList = new ArrayList<Marker>(); 
      for (int j = i + 1; j < markers.size();) { 
       int pixelDistance = pixelDistance(markers.get(i).getLatitude(), 
         markers.get(i).getLongitude(), markers.get(j) 
           .getLatitude(), markers.get(j).getLongitude(), 
         zoom); 

       if (pixelDistance < 40) { 


        markerList.add(markers.get(j)); 

        markers.remove(j); 

        originalListCopy.remove(j); 
        j = i + 1; 
       } else { 
        j++; 
       } 

      } 

      if (markerList.size() > 0) { 
markerList.add(markers.get(i));     
Cluster cluster = new Cluster(clusterList.size(), markerList, 
         markerList.size() + 1, originalListCopy.get(i) 
           .getLatitude(), originalListCopy.get(i) 
           .getLongitude()); 
       clusterList.add(cluster); 
       originalListCopy.remove(i); 
       markers.remove(i); 
       i = 0; 

      } else { 
       i++; 
      } 

      /* If a marker has been added to cluster, add also the one */ 
      /* we were comparing to and remove the original from array. */ 

     } 
     return clusterList; 
    } 

Just pass in your array list here containing latitude and longitude then to display clusters. Here goes the function. 


    @Override 
    public void onTaskCompleted(ArrayList<FlatDetails> flatDetailsList) { 

     LatLngBounds.Builder builder = new LatLngBounds.Builder(); 

     originalListCopy = new ArrayList<FlatDetails>(); 
     ArrayList<Marker> markersList = new ArrayList<Marker>(); 
     for (FlatDetails detailList : flatDetailsList) { 

      markersList.add(new Marker(detailList.getLatitude(), detailList 
        .getLongitude(), detailList.getApartmentTypeString())); 

      originalListCopy.add(detailList); 

      builder.include(new LatLng(detailList.getLatitude(), detailList 
        .getLongitude())); 

     } 

     LatLngBounds bounds = builder.build(); 
     int padding = 0; // offset from edges of the map in pixels 
     CameraUpdate cu = CameraUpdateFactory.newLatLngBounds(bounds, padding); 

     googleMap.moveCamera(cu); 

     ArrayList<Cluster> clusterList = Utils.cluster(markersList, 
       (int) googleMap.getCameraPosition().zoom); 

     // Removes all markers, overlays, and polylines from the map. 
     googleMap.clear(); 

     // Zoom in, animating the camera. 
     googleMap.animateCamera(CameraUpdateFactory.zoomTo(previousZoomLevel), 
       2000, null); 

     CircleOptions circleOptions = new CircleOptions().center(point) // 
       // setcenter 
       .radius(3000) // set radius in meters 
       .fillColor(Color.TRANSPARENT) // default 
       .strokeColor(Color.BLUE).strokeWidth(5); 

     googleMap.addCircle(circleOptions); 

     for (Marker detail : markersList) { 

      if (detail.getBhkTypeString().equalsIgnoreCase("1 BHK")) { 
       googleMap.addMarker(new MarkerOptions() 
         .position(
           new LatLng(detail.getLatitude(), detail 
             .getLongitude())) 
         .snippet(String.valueOf("")) 
         .title("Flat" + flatDetailsList.indexOf(detail)) 
         .icon(BitmapDescriptorFactory 
           .fromResource(R.drawable.bhk1))); 
      } else if (detail.getBhkTypeString().equalsIgnoreCase("2 BHK")) { 
       googleMap.addMarker(new MarkerOptions() 
         .position(
           new LatLng(detail.getLatitude(), detail 
             .getLongitude())) 
         .snippet(String.valueOf("")) 
         .title("Flat" + flatDetailsList.indexOf(detail)) 
         .icon(BitmapDescriptorFactory 
           .fromResource(R.drawable.bhk_2))); 

      } 

      else if (detail.getBhkTypeString().equalsIgnoreCase("3 BHK")) { 
       googleMap.addMarker(new MarkerOptions() 
         .position(
           new LatLng(detail.getLatitude(), detail 
             .getLongitude())) 
         .snippet(String.valueOf("")) 
         .title("Flat" + flatDetailsList.indexOf(detail)) 
         .icon(BitmapDescriptorFactory 
           .fromResource(R.drawable.bhk_3))); 

      } else if (detail.getBhkTypeString().equalsIgnoreCase("2.5 BHK")) { 
       googleMap.addMarker(new MarkerOptions() 
         .position(
           new LatLng(detail.getLatitude(), detail 
             .getLongitude())) 
         .snippet(String.valueOf("")) 
         .title("Flat" + flatDetailsList.indexOf(detail)) 
         .icon(BitmapDescriptorFactory 
           .fromResource(R.drawable.bhk2))); 

      } else if (detail.getBhkTypeString().equalsIgnoreCase("4 BHK")) { 
       googleMap.addMarker(new MarkerOptions() 
         .position(
           new LatLng(detail.getLatitude(), detail 
             .getLongitude())) 
         .snippet(String.valueOf("")) 
         .title("Flat" + flatDetailsList.indexOf(detail)) 
         .icon(BitmapDescriptorFactory 
           .fromResource(R.drawable.bhk_4))); 

      } else if (detail.getBhkTypeString().equalsIgnoreCase("5 BHK")) { 
       googleMap.addMarker(new MarkerOptions() 
         .position(
           new LatLng(detail.getLatitude(), detail 
             .getLongitude())) 
         .snippet(String.valueOf("")) 
         .title("Flat" + flatDetailsList.indexOf(detail)) 
         .icon(BitmapDescriptorFactory 
           .fromResource(R.drawable.bhk5))); 

      } else if (detail.getBhkTypeString().equalsIgnoreCase("5+ BHK")) { 
       googleMap.addMarker(new MarkerOptions() 
         .position(
           new LatLng(detail.getLatitude(), detail 
             .getLongitude())) 
         .snippet(String.valueOf("")) 
         .title("Flat" + flatDetailsList.indexOf(detail)) 
         .icon(BitmapDescriptorFactory 
           .fromResource(R.drawable.bhk_5))); 

      } 

      else if (detail.getBhkTypeString().equalsIgnoreCase("2 BHK")) { 
       googleMap.addMarker(new MarkerOptions() 
         .position(
           new LatLng(detail.getLatitude(), detail 
             .getLongitude())) 
         .snippet(String.valueOf("")) 
         .title("Flat" + flatDetailsList.indexOf(detail)) 
         .icon(BitmapDescriptorFactory 
           .fromResource(R.drawable.bhk_2))); 

      } 
     } 

     for (Cluster cluster : clusterList) { 

      BitmapFactory.Options options = new BitmapFactory.Options(); 
      options.inMutable = true; 
      options.inPurgeable = true; 
      Bitmap bitmap = BitmapFactory.decodeResource(getResources(), 
        R.drawable.cluster_marker, options); 

      Canvas canvas = new Canvas(bitmap); 

      Paint paint = new Paint(); 
      paint.setColor(getResources().getColor(R.color.white)); 
      paint.setTextSize(30); 

      canvas.drawText(String.valueOf(cluster.getMarkerList().size()), 10, 
        40, paint); 

      googleMap.addMarker(new MarkerOptions() 
        .position(
          new LatLng(cluster.getClusterLatitude(), cluster 
            .getClusterLongitude())) 
        .snippet(String.valueOf(cluster.getMarkerList().size())) 
        .title("Cluster") 
        .icon(BitmapDescriptorFactory.fromBitmap(bitmap))); 

     } 

    }