高德地图API总结--Marker多点聚合

Marker多点聚合计算

什么是多点聚合呢？所谓的多点聚合，就是计算地图上一定范围内的点的个数，然和讲所有的点统计的数量显示在范围内设置的marker上；我们需要解决的问题有：1、在地图上划定区域范围；2、计算范围内的点的个数；3、清楚原有的点，加上聚合后的点；4、如何刷新
先说第一个问题：
在地图上划定区域范围，如下代码实现：
Point mPoint 定义一个点，这个点是通过地图上的marker点在屏幕上的投影的点
划定区域范围

image.png

如上图，我们在划定区域的时候以西南角和东北角（手机屏幕上表现为右下角和左上角）的两个点直线距离为直径划定圆形区域，圆心为mPiont点所在的位置
southwestPoint的X轴上的值要小于northeastPoint的X轴上的值
northeastPoint的Y轴上的值要小于northeastPoint的Y轴上的值
southwestPoint 西南角
northeastPoint 东北角

Point mPoint = mProjection.toScreenLocation(mFirstMarkers.getPosition());
        Point southwestPoint = new Point(mPoint.x - mGridSize,mPoint.y + mGridSize);
        Point northeastPoint = new Point(mPoint.x + mGridSize,mPoint.y - mGridSize);
        double northELat = mProjection.fromScreenLocation(northeastPoint).latitude;
        double southWLat = mProjection.fromScreenLocation(southwestPoint).latitude;
        double northElong = mProjection.fromScreenLocation(northeastPoint).longitude;
        double southWlong = mProjection.fromScreenLocation(southwestPoint).longitude;
        if(northELat > southWLat && northElong > southWlong) {
            LatLng southWestLat = new LatLng(southWLat, southWlong);
            LatLng northEastLat = new LatLng(northELat, northElong);
            mBounds = new LatLngBounds(southWestLat, northEastLat);
        }

添加聚合后的marker点

mMarkerOptions.anchor(0.5f,0.5f)
              .position(mFirstMarkers.getPosition())
              .icon(mFirstMarkers.getIcon());
mIncludeMarkers = new ArrayList();
mIncludeMarkers.add(mFirstMarkers);

获取聚合后Marker点上的数量

int num = mIncludeMarkers.size();

设置marker的style样式和数据

int iconType = 0;
if(num < 100){
    iconType = num / 10;
}else if(num >= 100){
    iconType = (num / 100)/10;
}
switch (iconType) {
    case 0:
        mMarkerOptions.icon(BitmapDescriptorFactory
                .fromBitmap(getViewBitmap(getView(num,
                        R.mipmap.map_marker_num))));
        break;
    case 1:
        mMarkerOptions.icon(BitmapDescriptorFactory
                .fromBitmap(getViewBitmap(getView(num,
                        R.mipmap.map_marker_num))));
        break;
    case 2:
        mMarkerOptions.icon(BitmapDescriptorFactory
                .fromBitmap(getViewBitmap(getView(num,
                        R.mipmap.map_marker_num))));
        break;
    case 3:
        mMarkerOptions.icon(BitmapDescriptorFactory
                .fromBitmap(getViewBitmap(getView(num,
                        R.mipmap.map_marker_num))));
        break;
    case 4:
        mMarkerOptions.icon(BitmapDescriptorFactory
                .fromBitmap(getViewBitmap(getView(num,
                        R.mipmap.map_marker_num))));
        break;
    case 5:
        mMarkerOptions.icon(BitmapDescriptorFactory
                .fromBitmap(getViewBitmap(getView(num,
                        R.mipmap.map_marker_num))));
        break;
    case 6:
        mMarkerOptions.icon(BitmapDescriptorFactory
                .fromBitmap(getViewBitmap(getView(num,
                        R.mipmap.map_marker_num))));
        break;
    case 7:
        mMarkerOptions.icon(BitmapDescriptorFactory
                .fromBitmap(getViewBitmap(getView(num,
                        R.mipmap.map_marker_num))));
        break;
    case 8:
        mMarkerOptions.icon(BitmapDescriptorFactory
                .fromBitmap(getViewBitmap(getView(num,
                        R.mipmap.map_marker_num))));
        break;
    case 9:
        mMarkerOptions.icon(BitmapDescriptorFactory
                .fromBitmap(getViewBitmap(getView(num,
                        R.mipmap.map_marker_num))));
        break;
}

image.png

根据地图的移动重置和刷新每次的聚合后的点和数字，因为高德地图本身提供的地图移动的监听的方法，地图的放大缩小，移动都归属于地图的移动，我们只需要在地图移动的时候，我们需要通过Handler将Message传到子线程，当msg.what为0 的时候来重置地图上的所有Marker，

Handler timeHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        switch (msg.what) {
            case 0:
                // 更新markers
                resetMarkers();
                break;
        }
    }
};

补充（重置marker，参见代码）：

/**
 * 获取视野内的marker 根据聚合算法合成自定义的marker 显示视野内的marker
 */
private void resetMarkers() {
    /*
    * 返回一个Projection 对象。可以通过这个对象在屏幕坐标与经纬度坐标之间进行转换。
    * Projection 对象返回的是当前可视区域的坐标，当可视区域变换时，它不会自己更新。
    * 返回:
    * 当前地图位置的Projection对象。
    */
    Projection projection = aMap.getProjection();
    Point point = null;
    markerOptionsListInView.clear();
    for (MarkerOptions markerOptions : markerOptionsList) {
        point = projection.toScreenLocation(markerOptions.getPosition());
        if (point.x < 0 || point.y < 0 || point.x > width || point.y > height) {
        } else {
            markerOptionsListInView.add(markerOptions);
        }
    }
    // 自定义的聚合类mSetMarkerIcon
    ArrayList mSetMarkerIcon = new ArrayList();
    for (MarkerOptions mp : markerOptionsListInView) {
        if (mSetMarkerIcon.size() == 0) {
            mSetMarkerIcon.add(new SetMarkerIcon(MapActivity.this,
                    mp, projection, 80));// 100根据自己需求调整
        } else {
            boolean isIn = false;
            for (SetMarkerIcon cluster : mSetMarkerIcon) {
                if (cluster.getBounds() != null) {
                    if (cluster.getBounds().contains(mp.getPosition())) {
                        cluster.addMarker(mp);
                        isIn = true;
                        break;
                    }
                }
            }
            if (!isIn) {
                mSetMarkerIcon.add(new SetMarkerIcon(
                        MapActivity.this, mp, projection, 80));
            }
        }
    }
    // 设置聚合点的位置和icon
    for (SetMarkerIcon setMarkerIcon : mSetMarkerIcon) {
        setMarkerIcon.setPositionAndIcon();
    }
    //清楚marker
    aMap.clear(true);
    // 重新添加
    for (SetMarkerIcon markerIcon : mSetMarkerIcon) {
        aMap.addMarker(markerIcon.getOptions());
    }
}

Marker点击

首先需要在初始化的时候添加Marker点击的监听
aMap.setOnMarkerClickListener(this);// 设置点击marker事件监听器
点击事件的处理

/**
 * 对marker标注点点击响应事件
 */
@Override
public boolean onMarkerClick(Marker marker) {
//此处添加Marker点击事件的处理
return false;
}

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谢谢惠顾，感觉有用的点个赞