Android Maps Point Clustering

Question

Is there any code for Point Clustering in android? How can i load thousand pinpoint without having performance issues?

it's not a question. As i stated it's a faq .. sort of tutorial. "Saw that there was nothing out for the community so i would like to share" — weakwire, Sep 16 '11 at 16:36
Thanks for sharing. Though it's encouraged to post informative knowledge, these kind of posts should stick with SOs Q&A format. This means you should formulate a question and answer it. See [this blog post](http://blog.stackoverflow.com/2011/07/its-ok-to-ask-and-answer-your-own-questions/). You can also accept your own answers, theres even a badge for that. I'll upvote this to compensate for the downvotes - they're a bit harsh imho. — , Sep 16 '11 at 16:52

weakwire · Accepted Answer · 2012-09-18T20:27:37.743

34

Last night i got into PointClustering on Android MapView. Saw that there was nothing out for the community so i would like to share.

Groups the geopoints if the projection of them in the mapView is too close. Also renders only the visible poins.

UPDATE

Code reworked from scrach.

Now available at GitHub

Code Reworked from scratch
Used GVM clustering algorithm (pretty fast but doesn't position clustered point as good as mine)
Soon to add previous clustering algorithm too

enter image description here

edited Sep 18 '12 at 20:27

answered Sep 16 '11 at 16:52

weakwire

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I think there are a few things missing in your post, such as where is `public void draw(Canvas canvas, MapView mapView, boolean shadow)` supposed to go? – pandre Sep 21 '11 at 11:31
1

And what does OverlayItemExtended's getName() returns? Your post would be greatly improved if you provided the whole source – pandre Sep 21 '11 at 11:41
I edited the answer based on your suggestion. getName() is the getTitle() of the OverlayItem ,or what the point should render as a name to the map. – weakwire Sep 21 '11 at 14:07
I cannot post the entire code as it's a work in progress of a current inDevelopment project. – weakwire Sep 21 '11 at 14:11
thx for sharing this. i worked through the provided code and i think i figured most of it out. But as pandre already asked: could you also provide the code for the PointCluster Class? Does it only contain a static getOverLayItemDistance-Method? @pandre: The code for the draw() Method belongs within the class that is extending ItemizedOverlay. It overrides its draw-method. See also: http://stackoverflow.com/questions/4327733/it-is-possible-to-remove-the-shadow-of-the-icons-items-on-a-googlemap – muetzenflo Oct 11 '11 at 18:48
ty totally forgot it. i updated it with the PointCluster class. – weakwire Oct 11 '11 at 18:59
@weakwire did you finish the class? I copied your source and edited to fix the missing parts, but still not working. – SERPRO Nov 30 '11 at 16:42
what is not working?The class is finished. I'll propably post the whole scr when the project i'm working on is finished. Not now. – weakwire Nov 30 '11 at 19:45
@weakwire when I place your code inside a file Eclipse show multitude of errors, great work though, Hope to see it complete soon. :) – SERPRO Dec 01 '11 at 11:17
2

putting this in github would be nice – Federico Dec 27 '11 at 18:32
this code can easily be speeded up by not creating the paint objects inside onDraw() (and especially not inside a loop inside onDraw). A quick win! – Dori Jan 18 '12 at 19:05
you are right. as i mentioned "Sorry for the code is not finished yet but you get the idea." but ty for the comment you are absolutely right – weakwire Jan 18 '12 at 19:43
Where's this method itemizedOverlay.removeAllOverlays() ? Anyone succeeded in reordering/sorting everything? I'm lost. – Arnaud Mar 13 '12 at 13:21
added removePointsButMe method. All the code is there. I will post the code on a working project to gidhub / google code in the near future. – weakwire Mar 13 '12 at 17:14
Thanks for this. Another question thought, could you explain what is overlay.isMe? And where is the addOverlayItem method? – Arnaud Mar 13 '12 at 23:40
It seems your code actually works, since you provide screenshots, so can't you share the whole project ? It's so messy to make copy paste from here directly... – Raphaël Titol Jul 15 '12 at 22:23

score 4 · Answer 2 · edited Jan 31 '13 at 15:15

I have reworked in the above code and controlled the no of overlay icon in the map view and separated the group and single point.

My Code:

MMapView.java

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.impiger.maphighlight.R;

//Reference - http://stackoverflow.com/questions/7447350/android-maps-point-clustering

public class MMapView extends MapView {

    private static final String TAG = MMapView.class.getSimpleName();
    private static final int MAX_VISIBLE_POINTS = 1;
    private PMapViewOverlay itemizedOverlay;
    private List<Overlay> mapOverlays;
    private List<GeoPoint> geoPoints = new ArrayList<GeoPoint>();
    private BitmapDrawable drawable;
    private Context context;
    private Drawable emptyDrawable;
    private int count;
    private int oldZoomLevel = -1;
    ArrayList<OverlayItemExtended> mOverlays;

    public MMapView(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
        mapOverlays = getOverlays();
        drawable = new BitmapDrawable(
                BitmapFactory.decodeResource(getResources(),
                        R.drawable.blue_65));
        itemizedOverlay = new PMapViewOverlay(drawable, context);
        emptyDrawable = context.getResources().getDrawable(
                R.drawable.marker);
        mOverlays = new ArrayList<OverlayItemExtended>();
        init();
    }

    private GeoPoint getPoint(double lat, double lon) {
        return (new GeoPoint((int) (lat * 1000000.0), (int) (lon * 1000000.0)));
    }

    private void init(){
        putPoint(11, 77, true);
        putPoint(11.5, 76.6, false);
        putPoint(10.98383, 77.32112, false);
        putPoint(10, 77, false);
        putPoint(11, 78, false);
        putPoint(11, 77.5, false);
        putPoint(10.5, 77, false);
        putPoint(12, 77, false);
        putPoint(11.77, 77.11, false);
        putPoint(12.1, 78.33, false);
        putPoint(11.83, 77.293, false);
        putPoint(11.12, 77, false);
        putPoint(11.13, 77, false);
        putPoint(11.14, 77, false);
        putPoint(11.15, 77, false);
        putPoint(11.12, 77.2, false);
        putPoint(11.13, 77.34, false);
        putPoint(11.14, 77.4, false);
        putPoint(11.15, 77.1977, false);
        putPoint(11.347373, 77.5627783, true);
        putPoint(11.53454, 76.696645, false);
        putPoint(10.19282, 77.847373, false);
        putPoint(10.4728, 76.39388, false);
        putPoint(11.4563, 78, false);
        putPoint(11.73663, 77.5927, false);
        putPoint(10.5674, 77.6762, false);
        putPoint(12.02882, 77.672782, false);
        putPoint(11.7767876, 77.1123423, false);
        putPoint(12.18332, 78.33, false);
        putPoint(11.8393883, 77.293938783, false);
        putPoint(11.388323, 77.9478723, false);
        putPoint(11.1345645, 77.97723, false);
        putPoint(11.1423423, 77.73774, false);
        putPoint(11.1552, 77.793783, false);
        putPoint(11.127895434, 77.2944554, false);
        putPoint(11.13232345, 77.342234, false);
        putPoint(11.14456573, 77.4, false);
        putPoint(11.159765, 77.1977, false);
    }


    public void putPoint(double lat, double lon, boolean isMyPosition) {
        int latitude = (int) (lat * 1E6);
        int longitude = (int) (lon * 1E6);
        GeoPoint geo = new GeoPoint(latitude, longitude);
        geo = getPoint(lat, lon);

        /*
         * Remove doubles
         */
        Boolean alreadyExists = false;
        for (GeoPoint item : geoPoints) {
            if (item.getLatitudeE6() == geo.getLatitudeE6()
                    && item.getLongitudeE6() == geo.getLongitudeE6()) {
                alreadyExists = true;
            }
        }
        if (!alreadyExists) {
            geoPoints.add(geo);
        }
    }

    /*
     * Place the overlays
     */
    public void placeOverlays() {
        itemizedOverlay.removeAllOverlays();
        getOverlays().clear();
        mapOverlays.clear();
        mOverlays.clear();
        int i = 1;
        for (GeoPoint item : geoPoints) {
            OverlayItemExtended overlayitem = new OverlayItemExtended(item,
                    "title "+i, "snippet");
            // Here is where the magic happens
            addOverlayItemClustered(overlayitem, this,
                    geoPoints.size());
            i++;
        }

        for(int j=0;j<mOverlays.size();j++){
            OverlayItemExtended overlayItem = mOverlays.get(j);
            if(overlayItem.isMaster){
                if(overlayItem.slaves.size() > 0){
                    itemizedOverlay = new PMapViewOverlay(drawable, context);
                    itemizedOverlay.addOverlayItem(overlayItem);
                }else{
                    itemizedOverlay = new PMapViewOverlay(emptyDrawable, context);
                    itemizedOverlay.addOverlayItem(overlayItem);
                }
                mapOverlays.add(itemizedOverlay);
            }
        }
    }

    /*
     * Update the points at panned / zoom etc
     */
    public void dispatchDraw(Canvas canvas) {
        super.dispatchDraw(canvas);
        if (getZoomLevel() != oldZoomLevel) {
            placeOverlays();
        }
        oldZoomLevel = getZoomLevel();
    }

    public void addOverlayItemClustered(OverlayItemExtended thisOverlay,
            MapView mapView, int totalPoints) {
        for (OverlayItemExtended otherOverlay : mOverlays) {
            /*
             * Thresshold for the clustering
             */
            /*
             * Zoom level >15 don't cluster If less than Max_Visible_points
             * don't cluster
             */
            if (mapView.getZoomLevel() >= 14
                    || (MAX_VISIBLE_POINTS > totalPoints)
                    && PointCluster.getOverLayItemDistance(thisOverlay,
                            otherOverlay, mapView) > 60) {
                mOverlays.add(thisOverlay);
                return;
            }
            if (PointCluster.getOverLayItemDistance(thisOverlay, otherOverlay,
                    mapView) < 90 && !thisOverlay.isClustered) {
                // Here is where the clustering actually happens
                if (otherOverlay.isMaster) {
                    thisOverlay.isMaster = false;
                    // otherOverlay.isMaster = false;
                    thisOverlay.isClustered = true;
                    otherOverlay.isClustered = true;
                    otherOverlay.slaves.push(thisOverlay);
                    thisOverlay.parent = otherOverlay;
                } else if (PointCluster.getOverLayItemDistance(thisOverlay,
                        otherOverlay.parent, mapView) < 90
                        && otherOverlay.isClustered) {
                    thisOverlay.isMaster = false;
                    thisOverlay.isClustered = true;
                    thisOverlay.parent = otherOverlay.parent;
                    otherOverlay.parent.slaves.push(thisOverlay);
                }
            }
        }
        mOverlays.add(thisOverlay);
    }
}

OverlayItemExtended.java

import java.util.Stack;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.OverlayItem;

public class OverlayItemExtended extends OverlayItem {

    public boolean isClustered = false;
    public boolean isMaster = true;
    public boolean isMe = false;
    public OverlayItemExtended parent;
    public Stack<OverlayItemExtended> slaves = new Stack<OverlayItemExtended>();

    public OverlayItemExtended(GeoPoint point, String title, String snippet) {
        super(point, title, snippet);
    }
}

PMapViewOverlay.java

import java.util.ArrayList;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import android.widget.Toast;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapView;

@SuppressWarnings("rawtypes")
public class PMapViewOverlay extends ItemizedOverlay {

    private static final String TAG = PMapViewOverlay.class.getSimpleName();
    private Context context;
    private ArrayList<OverlayItemExtended> mOverlays;

    public PMapViewOverlay(Drawable defaultMarker, Context context) {
        super(boundCenterBottom(defaultMarker));
        this.context = context;
        mOverlays = new ArrayList<OverlayItemExtended>();

        paint.setTextAlign(Paint.Align.CENTER);
        paint.setTextSize(25);
        paint.setAntiAlias(true);
        paint.setStrokeWidth(5);
        paint.setColor(Color.WHITE);
    }

    @Override
    protected OverlayItemExtended createItem(int i) {
        return mOverlays.get(i);
    }

    @Override
    public int size() {
        return mOverlays.size();
    }

    public void addOverlayItem(OverlayItemExtended overlay) {
        mOverlays.add(overlay);
        populate();
    }

    public void removeAllOverlays() {
        mOverlays.clear();
        populate();
    }

    public void removePointsButMe() {
        for (int i = 0; i < mOverlays.size(); i++) {
            OverlayItemExtended overlay = mOverlays.get(i);
            if (overlay.isMe) {
                mOverlays.clear();
                addOverlayItem(overlay);
                break;
            }
        }
        populate();
    }

    Paint paint = new Paint();

    @Override
    public void draw(Canvas canvas, MapView mapView, boolean shadow) {
        super.draw(canvas, mapView, shadow);

        // cycle through all overlays
        for (int index = 0; index < mOverlays.size(); index++) {
            OverlayItemExtended item = mOverlays.get(index);

            // Converts lat/lng-Point to coordinates on the screen
            GeoPoint point = item.getPoint();
            Point ptScreenCoord = new Point();
            mapView.getProjection().toPixels(point, ptScreenCoord);

            if (item.isMaster) {
                if (item.slaves.size() > 0) {
                    canvas.drawText(item.slaves.size() + 1 + "",
                            ptScreenCoord.x, ptScreenCoord.y - 13, paint);
                }
            }
        }
    }

    @Override
    protected boolean onTap(int index) {
        OverlayItemExtended item = mOverlays.get(index);
        if (item.isMaster) {
            if (item.slaves.size() == 0) {
                Toast.makeText(context, "You tapped item " + item.getTitle(),
                        Toast.LENGTH_LONG).show();
            }
        }
        return super.onTap(index);
    }
}

I didn't change any code in PointCluster.java.

I hope this will help somebody. enter image description here

I didn't change any code in PointCluster.java? Where is PointCluster.java? Can you post it? — Shrikant, Sep 03 '12 at 06:12
@Shrikant: You can find the PointCluster http://code.google.com/p/posit-mobile/issues/attachmentText?id=341&aid=3410006001&name=PointCluster.java&token=LcULxfBdvuDxXZ0ozbCo1_czN1o%3A1335505698432 — Veer, Sep 24 '12 at 16:06

score 2 · Answer 3 · answered Jul 15 '18 at 10:14

Google's Android Map Utils has a solution for this: Google Maps Android Marker Clustering Utility.

Add dependency

implementation 'com.google.maps.android:android-maps-utils:0.5'

Make your own ClusterItem

class MyItem(
        private val position: LatLng,
        val title: String,
        private val snippet: String
) : ClusterItem {
    override fun getPosition() = position
    override fun getTitle() = title
    override fun getSnippet() = snippet
}

Setting up the cluster manager and adding items

override fun onMapReady(googleMap: GoogleMap) {
    val clusterManager = ClusterManager<MyItem>(this, googleMap)
    googleMap.setOnCameraIdleListener(clusterManager)

    clusterManager.addItem(MyItem(LatLng(51.51, -0.12), "title", "snippet"))
}

That's it! Items are now shown as follows:

Customizing the icon

In order to customize the icon, add val icon: BitmapDescriptor to your ClusterItem and change the renderer of the cluster manager:

    clusterManager.renderer = object : DefaultClusterRenderer<MyItem>(this, googleMap, clusterManager) {
        override fun onBeforeClusterItemRendered(item: MyItem, markerOptions: MarkerOptions) {
            markerOptions.icon(item.icon)
        }
    }

Making items clickable

As a rule of thumb, any interaction with markers should go through the cluster manager instead. The same applies to making items clickable.

    googleMap.setOnMarkerClickListener(clusterManager)
    clusterManager.setOnClusterItemClickListener {
        Toast.makeText(this, "Clicked on item ${it.title}", Toast.LENGTH_SHORT).show()
        true
    }

Similarly, you can call googleMap.setOnInfoWindowClickListener(clusterManager) and clusterManager.setOnClusterItemInfoWindowClickListener to handle clicks on the info window.

score 1 · Answer 4 · answered Aug 06 '12 at 11:02

1

There is a nice sample for it. Check it here: http://code.google.com/p/android-playground-erdao/source/browse/trunk/SampleClusterMap/?r=226

answered Aug 06 '12 at 11:02

sealskej

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score 1 · Answer 5 · answered Dec 20 '12 at 21:28

1

There is a pull request on github for the Polaris library (https://github.com/cyrilmottier/Polaris) which adds clustering:

https://github.com/cyrilmottier/Polaris/pull/20

https://github.com/damianflannery/Polaris/tree/clustering

answered Dec 20 '12 at 21:28

Intrications

16,782
9
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score 0 · Answer 6 · edited May 23 '17 at 11:43

0

There also this answer which only requires you override the draw method of your Overlay. It divides your mapView into sections, so it's a bit less sophisticated. But at least it worked.

edited May 23 '17 at 11:43

Community

1
1

answered Jul 20 '12 at 10:00

Maarten

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7
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score 0 · Answer 7 · edited Aug 18 '17 at 12:28

FOR ANDROID V2 HERE GOES CLUSTERING CODE

Hi All

I looked at various libraries and found them so complexx could'nt understand a word so i decided to make my own clutering algo Here goes my code in java

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

                    markers.remove(j);

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

            }

            if (markerList.size() > 0) {
                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)));

        }

    }

ANY QUESTIONS OR DOUBTS PLEASE ASK WILL CLEAR THEM ALL ...........THANKS

Android Maps Point Clustering

7 Answers7

MMapView.java

OverlayItemExtended.java

PMapViewOverlay.java

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