我必须从 Google Maps Android v2 API 在 GoogleMap 上放置不同的标记。问题是多个标记被设置到相同的位置(纬度/经度),所以用户只能看到“最新”的标记。
是否有可能(在最好的情况下:图书馆)聚集来自同一区域的不同标记(相对于缩放级别)?
我已经阅读过MarkerClusterer,但这是为 JavaScript API 设计的。
我必须从 Google Maps Android v2 API 在 GoogleMap 上放置不同的标记。问题是多个标记被设置到相同的位置(纬度/经度),所以用户只能看到“最新”的标记。
是否有可能(在最好的情况下:图书馆)聚集来自同一区域的不同标记(相对于缩放级别)?
我已经阅读过MarkerClusterer,但这是为 JavaScript API 设计的。
Google 提供了一个实用程序来执行此操作,作为其 Google Maps Android API 实用程序库的一部分:
https://developers.google.com/maps/documentation/android/utility/marker-clustering
来源:
我还没有机会尝试这个,但它看起来很有希望:
http://code.google.com/p/android-maps-extensions/
从这个帖子
这是另一个库,其中包含一些非常酷的集群动画:
我有点晚了,但是 Clusterkraf 是一个很棒的库,请查看:
对于正在寻找实现自己的集群代码的其他人。请快速检查我的聚类算法,效果非常好。
我查看了各种库,发现它们非常复杂,一个词都看不懂,所以我决定制作自己的聚类算法。这是我在java中的代码。
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)));
}
}
您需要按照以下步骤操作:
安卓工作室/Gradle:
dependencies {
compile 'com.google.maps.android:android-maps-utils:0.3+'
}
添加一个简单的标记聚类器
按照以下步骤创建一个包含十个标记的简单集群。结果将如下所示,尽管显示/聚集的标记数量会根据缩放级别而变化:
以下是所需步骤的摘要:
ClusterItem
以在地图上表示标记。集群项将标记的位置作为 LatLng 对象返回。ClusterManager
的以根据缩放级别对集群项目(标记)进行分组。OnCameraChangeListener()
为ClusterManager
, 因为ClusterManager
实现了侦听器。OnMarkerClickListener()
为ClusterManager
,因为ClusterManager
实现了侦听器。ClusterManager
.更详细地查看这些步骤:要创建包含十个标记的简单集群,首先创建一个MyItem
实现ClusterItem
.
public class MyItem implements ClusterItem {
private final LatLng mPosition;
public MyItem(double lat, double lng) {
mPosition = new LatLng(lat, lng);
}
@Override
public LatLng getPosition() {
return mPosition;
}
}
在您的地图活动中,添加ClusterManager
集群项目并将其提供给它。注意 type 参数<MyItem>
,它将 ClusterManager 声明为 type MyItem
。
private void setUpClusterer() {
// Declare a variable for the cluster manager.
private ClusterManager<MyItem> mClusterManager;
// Position the map.
getMap().moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(51.503186, -0.126446), 10));
// Initialize the manager with the context and the map.
// (Activity extends context, so we can pass 'this' in the constructor.)
mClusterManager = new ClusterManager<MyItem>(this, getMap());
// Point the map's listeners at the listeners implemented by the cluster
// manager.
getMap().setOnCameraChangeListener(mClusterManager);
getMap().setOnMarkerClickListener(mClusterManager);
// Add cluster items (markers) to the cluster manager.
addItems();
}
private void addItems() {
// Set some lat/lng coordinates to start with.
double lat = 51.5145160;
double lng = -0.1270060;
// Add ten cluster items in close proximity, for purposes of this example.
for (int i = 0; i < 10; i++) {
double offset = i / 60d;
lat = lat + offset;
lng = lng + offset;
MyItem offsetItem = new MyItem(lat, lng);
mClusterManager.addItem(offsetItem);
}
}
演示
https://www.youtube.com/watch?v=5ZnVraO1mT4
Github
如果您需要更多信息/已完成的项目,请访问:https ://github.com/dimitardanailov/googlemapsclustermarkers
如果您有更多问题,请与我联系。
对于谁在使用Clusterkraf时遇到问题(我无法让它工作!)以及谁不能使用android-maps-extension因为它附带了自定义构建的 Play Services 库,我想建议这个其他库,即很小,写得很好,开箱即用:
在尝试使用其他两个库之后,这个库拯救了我的一天!
如果您只获得最新的标记,那么您需要对所有标记进行聚类
> private ClusterManager<MyItem> mClusterManager;
添加项目后
mClusterManager.addItem("your item");
mClusterManager.cluster();
对于那些在 Google Maps Android API 实用程序库的性能方面遇到问题的人,我们创建了自己的快速集群库:https ://github.com/sharewire/google-maps-clustering 。它可以轻松处理地图上的 20000 个标记。