ExampleFragment.java

package com.example.fragment;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.View;

import com.example.R;
import com.example.entity.ProductEntity;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapView;
import com.google.android.gms.maps.model.BitmapDescriptor;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.maps.android.clustering.ClusterManager;
import com.google.maps.android.clustering.view.DefaultClusterRenderer;


public class ExampleFragment extends Fragment
{
	private View mRootView;
	private ClusterManager<ProductEntity> mClusterManager;


	@Override
	public void onActivityCreated(Bundle savedInstanceState)
	{
		super.onActivityCreated(savedInstanceState);
		setupClusterManager();
		bindData();
	}


	private void bindData()
	{
		// reference
		GoogleMap map = ((MapView) mRootView.findViewById(R.id.fragment_example_map)).getMap();

		// content
		if(map != null)
		{
			for(int i = 0; i < 16; i++)
			{
				ProductEntity product = new ProductEntity();
				product.setName("Example " + i);
				product.setPosition(new LatLng(49.194696 + 0.1 * Math.sin(i * Math.PI / 8), 16.608595 + 0.1 * Math.cos(i * Math.PI / 8)));
				mClusterManager.addItem(product);
			}
		}
	}


	private void setupClusterManager()
	{
		// reference
		GoogleMap map = ((MapView) mRootView.findViewById(R.id.fragment_example_map)).getMap();

		// clustering
		if(map != null)
		{
			mClusterManager = new ClusterManager<>(getActivity(), map);
			mClusterManager.setRenderer(new DefaultClusterRenderer<ProductEntity>(getActivity(), map, mClusterManager)
			{
				@Override
				protected void onBeforeClusterItemRendered(ProductEntity product, MarkerOptions markerOptions)
				{
					BitmapDescriptor bitmapDescriptor = BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED);
					markerOptions.title(product.getName());
					markerOptions.icon(bitmapDescriptor);
					super.onBeforeClusterItemRendered(product, markerOptions);
				}
			});
			map.setOnCameraChangeListener(mClusterManager);
		}
	}
}