安卓地图兴趣点 聚合加载

/**
* 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;
}
}