Programming language: Java
License: Apache License 2.0
Tags: Android     Animations     Google Maps     Clustering    
Latest version: v0.1.3

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Google Maps Clustering for Android

Download Android Arsenal

A fast marker clustering library for Google Maps Android API.



Why not use Google Maps Android API Utility Library? Because it's very slow for large amounts of markers, which causes skipping frames and ANRs (see Issue #29, Issue #82). But this library can easily handle thousands of markers (the video above demonstrates the sample application with 20 000 markers running on Nexus 5).


  1. Make sure you have JCenter in your repository list: groovy repositories { jcenter() }
  2. Add a dependency to your build.gradle: groovy dependencies { compile 'net.sharewire:google-maps-clustering:0.1.3' }


  1. Implement ClusterItem to represent a marker on the map. The cluster item returns the position of the marker and an optional title or snippet:

class SampleClusterItem implements ClusterItem {

    private final LatLng location;

    SampleClusterItem(@NonNull LatLng location) {
        this.location = location;

    public double getLatitude() {
        return location.latitude;

    public double getLongitude() {
        return location.longitude;

    public String getTitle() {
        return null;

    public String getSnippet() {
        return null;
  1. Create an instance of ClusterManager and set it as a camera idle listener using GoogleMap.setOnCameraIdleListener(...):
ClusterManager<SampleClusterItem> clusterManager = new ClusterManager<>(context, googleMap);
  1. To add a callback that's invoked when a cluster or a cluster item is clicked, use ClusterManager.setCallbacks(...):
clusterManager.setCallbacks(new ClusterManager.Callbacks<SampleClusterItem>() {
            public boolean onClusterClick(@NonNull Cluster<SampleClusterItem> cluster) {
                Log.d(TAG, "onClusterClick");
                return false;

            public boolean onClusterItemClick(@NonNull SampleClusterItem clusterItem) {
                Log.d(TAG, "onClusterItemClick");
                return false;
  1. To customize the icons create an instance of IconGenerator and set it using ClusterManager.setIconGenerator(...). You can also use the default implementation DefaultIconGenerator and customize the style of icons using DefaultIconGenerator.setIconStyle(...).

  2. Populate ClusterManager with items using ClusterManager.setItems(...):

List<SampleClusterItem> clusterItems = generateSampleClusterItems();