安卓地图兴趣点 聚合加载

加载地图 我们一般根据业务需求会添加一些 兴趣点，有时我们需要加载很多，如果按照普通的加载的话，会显得界面很卡顿，所以从网上参考一下资料，这里是聚合形式的方式来实现
代码：如下

    /**     * 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 resetMarks() {        System.out.println("markerOptionsList.size():"                + markerOptionsList.size());        Projection projection = aMap.getProjection();        Point p = null;        markerOptionsListInView.clear();        // 获取在当前视野内的marker;提高效率        for (MarkerOptions mp : markerOptionsList) {            p = projection.toScreenLocation(mp.getPosition());            if (p.x < 0 || p.y < 0 || p.x > width || p.y > height) {                // 不添加到计算的列表中            } else {                markerOptionsListInView.add(mp);            }        }        // 自定义的聚合类MyMarkerCluster        ArrayList<MyMarkerCluster> clustersMarker = new ArrayList<MyMarkerCluster>();        for (MarkerOptions mp : markerOptionsListInView) {            if (clustersMarker.size() == 0) {                clustersMarker.add(new MyMarkerCluster(MainActivity.this,                        mp, projection, 60));// 100根据自己需求调整            } else {                boolean isIn = false;                for (MyMarkerCluster cluster : clustersMarker) {                    if (cluster.getBounds().contains(mp.getPosition())) {                        cluster.addMarker(mp);                        isIn = true;                        break;                    }                }                if (!isIn) {                    clustersMarker.add(new MyMarkerCluster(                            MainActivity.this, mp, projection, 60));                }            }        }        // 设置聚合点的位置和icon        for (MyMarkerCluster mmc : clustersMarker) {            mmc.setpositionAndIcon();        }        aMap.clear();        // 重新添加        for (MyMarkerCluster cluster : clustersMarker) {            aMap.addMarker(cluster.getOptions());        }    }

    /** * 高德地图聚合 * */public class MyMarkerCluster {    private Activity activity;    private MarkerOptions options;    private ArrayList<MarkerOptions> includeMarkers;    private LatLngBounds bounds;// 创建区域    /**     *      * @param activity     * @param firstMarkers     * @param projection     * @param gridSize 区域大小参数     */    public MyMarkerCluster(Activity activity, MarkerOptions firstMarkers,            Projection projection, int gridSize) {        // TODO Auto-generated constructor stub        // this.options = firstMarkers;        options = new MarkerOptions();        this.activity = activity;        Point point = projection.toScreenLocation(firstMarkers.getPosition());        Point southwestPoint = new Point(point.x - gridSize, point.y + gridSize);        Point northeastPoint = new Point(point.x + gridSize, point.y - gridSize);        bounds = new LatLngBounds(                projection.fromScreenLocation(southwestPoint),                projection.fromScreenLocation(northeastPoint));        options.anchor(0.5f, 0.5f).title(firstMarkers.getTitle())                .position(firstMarkers.getPosition())                .icon(firstMarkers.getIcon())                .snippet(firstMarkers.getSnippet());        includeMarkers = new ArrayList<MarkerOptions>();        includeMarkers.add(firstMarkers);    }    /**     * 添加marker     */    public void addMarker(MarkerOptions markerOptions) {        includeMarkers.add(markerOptions);// 添加到列表中    }    /**     * 设置聚合点的中心位置以及图标     */    public void setpositionAndIcon() {        int size = includeMarkers.size();        if (size == 1) {            return;        }        double lat = 0.0;        double lng = 0.0;        String snippet = "";        for (MarkerOptions op : includeMarkers) {            lat += op.getPosition().latitude;            lng += op.getPosition().longitude;            snippet += op.getTitle() + "\n";        }        options.position(new LatLng(lat / size, lng / size));// 设置中心位置为聚集点的平均位置        options.title("聚合点");        options.snippet(snippet);        int iconType = size / 10;        switch (iconType) {        case 0:            int identifier = activity.getResources().getIdentifier("marker_cluster_10", "drawable", "com.ez360.cd2016");            options.icon(BitmapDescriptorFactory                    .fromBitmap(getViewBitmap(getView(size,                            identifier))));            break;        case 1:            int identifier_2 = activity.getResources().getIdentifier("marker_cluster_20", "drawable", "com.ez360.cd2016");            options.icon(BitmapDescriptorFactory                    .fromBitmap(getViewBitmap(getView(size,                            identifier_2))));            break;        case 2:            int identifier_3 = activity.getResources().getIdentifier("marker_cluster_30", "drawable", "com.ez360.cd2016");            options.icon(BitmapDescriptorFactory                    .fromBitmap(getViewBitmap(getView(size,                            identifier_3))));            break;        case 3:            int identifier_30 = activity.getResources().getIdentifier("marker_cluster_30", "drawable", "com.ez360.cd2016");            options.icon(BitmapDescriptorFactory                    .fromBitmap(getViewBitmap(getView(size,                            identifier_30))));            break;        case 4:            int identifier_50 = activity.getResources().getIdentifier("marker_cluster_50", "drawable", "com.ez360.cd2016");            options.icon(BitmapDescriptorFactory                    .fromBitmap(getViewBitmap(getView(size,                            identifier_50))));            break;        default:            int identifier_100 = activity.getResources().getIdentifier("marker_cluster_100", "drawable", "com.ez360.cd2016");            options.icon(BitmapDescriptorFactory                    .fromBitmap(getViewBitmap(getView(size,                            identifier_100))));            break;        }    }    public LatLngBounds getBounds() {        return bounds;    }    public MarkerOptions getOptions() {        return options;    }    public void setOptions(MarkerOptions options) {        this.options = options;    }    public View getView(int carNum, int resourceId) {        View view = activity.getLayoutInflater().inflate(                R.layout.my_car_cluster_view, null);        TextView carNumTextView = (TextView) view.findViewById(R.id.my_car_num);        RelativeLayout myCarLayout = (RelativeLayout) view                .findViewById(R.id.my_car_bg);        myCarLayout.setBackgroundResource(resourceId);        carNumTextView.setText(String.valueOf(carNum));        return view;    }    /**     * 把一个view转化成bitmap对象     */    public static Bitmap getViewBitmap(View view) {        view.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());        view.buildDrawingCache();        Bitmap bitmap = view.getDrawingCache();        return bitmap;    }}

主要代码，有问题的朋友可以交流~