Reputation: 9300
Is there any code for Point Clustering in android? How can i load thousand pinpoint without having performance issues?
Upvotes: 39
Views: 18683
Reputation: 14135
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.
Upvotes: 2
Reputation: 509
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
Upvotes: 0
Reputation: 41
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:
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);
}
}
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);
}
}
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.
Upvotes: 4
Reputation: 16962
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
Upvotes: 1
Reputation: 9300
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
Upvotes: 34
Reputation: 7421
There is a nice sample for it. Check it here: http://code.google.com/p/android-playground-erdao/source/browse/trunk/SampleClusterMap/?r=226
Upvotes: 1
Reputation: 7338
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.
Upvotes: 0