百度地图的demo中，是在MarkerClusterDemo.java中演示了点聚合功能，不过比较简单，不能满足实际应用的需求。
在其基础功能之上，做了如下改进：
1，给标记点传递数据；
2，实现聚合点的点击功能，点击后在地图上展开聚合点的内容；
3，聚合的起始数目修改，支持2个点也能聚合；
4，聚合的范围调整，避免聚合点图标的互相覆盖；
5，实现地图状态变化的监听；(In the demo of the Baidu map, the point aggregation function is demonstrated in the MarkerClusterDemo.java, but it is relatively simple and can not meet the needs of the actual application.
On the basis of its basic functions, the following improvements have been made:
1, transfer the data to the mark point.
2, realize the click function of the aggregation point, and click on the map to expand the content of the aggregated point on the map.
3, the initial number of the aggregation is modified, and the support of 2 points can also be aggregated.
4, the range of polymerization is adjusted to avoid the mutual coverage of the aggregation point icons;
5, to monitor the change of map status.)