我有带有折线的 googleMap (v2),它显示了用户当前位置和目的地点之间的路线。
现在,我想根据用户移动来更新折线。
当位置改变但多段线闪烁时,我试图重绘整个多段线。
我在 PolylineOptions 类中没有找到任何合适
的函数(函数 add() 只是添加顶点,而不是更新或删除)
你知道如何更新折线吗???
感谢您抽出时间。
问问题
16395 次
3 回答
19
从版本 3.1.36 开始的唯一方法:
List<LatLng> points = polyline.getPoints();
points.add(newPoint);
polyline.setPoints(points);
希望该 API 将在以后的版本中得到增强。
于 2013-06-11T07:17:06.010 回答
2
*我已经完成了更新折线路径而不删除折线的工作。我们可以通过改变该折线的点来做到这一点。检查下面的代码。
这就是将新点设置为折线的逻辑。
/*Here the routes contain the points(latitude and longitude)*/
for (int i = 0; i < routes.size(); i++) {
Route route = routes.get(i);
if(polyline_path != null){
polyline_path.setPoints(route.points);
}
}
详细说明:
private GoogleMap map_object;
private Marker marker_driver;
private Marker marker_drop_off;
private Polyline polyline_path;
private PolylineOptions polylineOptions_path;
...
...
...
/*HelperDirectionFinder is a class that I create to call google API and I used this
class to get directions routes*/
/*I have created Service, and I'm calling this lines below after 5 sec. to get the
updated routes from google API.*/
HelperDirectionFinder directionFinder = new HelperDirectionFinder(
JobEndScreen.this, source, destinations);
try {
directionFinder.showDirection();
} catch (UnsupportedEncodingException e) {
HelperProgressDialog.closeDialog();
}
...
...
...
@Override
public void onDirectionFinderStart() {
if(polylineOptions_path == null){
HelperProgressDialog.showDialog(getActivity(), "", getString(R.string.text_loading));
}
}
/*This interface method is called after getting routes from google API.*/
/*Here the routes contains the list of path or routes returned by Google Api*/
@Override
public void onDirectionFinderSuccess(List<Route> routes) {
HelperProgressDialog.closeDialog();
/*When polylineOptions_path is null it means the polyline is not drawn.*/
/*If the polylineOptions_path is not null it means the polyline is drawn on map*/
if(polylineOptions_path == null){
for (Route route : routes) {
polylineOptions_path = new PolylineOptions().
geodesic(true).
color(ContextCompat.getColor(getActivity(), R.color.color_bg_gray_dark)).
width(10);
for (int i = 0; i < route.points.size(); i++)
polylineOptions_path.add(route.points.get(i));
polyline_path = map_object.addPolyline(polylineOptions_path);
}
}
else {
for (int i = 0; i < routes.size(); i++) {
Route route = routes.get(i);
if(polyline_path != null){
polyline_path.setPoints(route.points);
}
}
}
}
于 2018-07-02T08:08:21.077 回答
1
//Declare on global
PolylineOptions polyOptions, polyOptions2;
Polyline polyline2;
List<LatLng> ltln;
private Double lat_decimal = 0.0,lng_decimal=0.0;
//initialize
ltln = new ArrayList<>();
//如果你正在使用路由库
compile 'com.github.jd-alexander:library:1.0.7'
@Override
public void onRoutingSuccess(ArrayList<Route> arrayList, int i) {
//Add this code snippet on onRoutingSuccess to store latlan list
ltln = new ArrayList<>();
System.out.println("-----arrayList------" + arrayList.get(0).getPoints());
ltln = arrayList.get(0).getPoints();
// NOTE here already we draw polyLine 1
}
//below mentioned how to update polyline
private void UpdatePoliline(){
System.out.println("-------runnablePolyline-------"+ltln.size());
try {
if (ltln.size() > 0) {
for (int i = 0; i < ltln.size(); i++) {
ltln.remove(i);
if (CalculationByDistance(ltln.get(i), new LatLng(lat_decimal, lng_decimal)) >= 10) {
break;
}
}
polyOptions2 = new PolylineOptions();
polyOptions2.color(getResources().getColor(R.color.app_color));
polyOptions2.width(7);
polyOptions2.addAll(ltln);
if (polyline2 == null) {
polyline2 = googleMap.addPolyline(polyOptions2);
if (polyLines.size() > 0) {
for (Polyline poly : polyLines) {
poly.remove();
}
}
polyLines.add(polyline2);
if (polyline != null) {
polyline.remove();
polyline = null;
}
} else {
polyline = googleMap.addPolyline(polyOptions2);
if (polyLines.size() > 0) {
for (Polyline poly : polyLines) {
poly.remove();
}
}
polyLines.add(polyline);
if (polyline2 != null) {
polyline2.remove();
polyline2 = null;
}
}
System.out.println("=====waypoints new===" + ltln);
}
} catch (IndexOutOfBoundsException e) {
e.printStackTrace();
}
}
// 计算两点之间的距离
public float CalculationByDistance(LatLng StartP, LatLng EndP) {
Location locationA = new Location("Source");
locationA.setLatitude(StartP.latitude);
locationA.setLongitude(StartP.longitude);
Location locationB = new Location("Destination");
locationB.setLatitude(EndP.latitude);
locationB.setLongitude(EndP.longitude);
float distance = locationA.distanceTo(locationB);
return distance;
}
//重绘折线 车辆不在当前折线中特定距离
if (ltln.size() > 0) {
if (PolyUtil.isLocationOnPath(new LatLng(currentlat, currentLon), ltln, false, 60.0f) ){
System.out.println("===tolarance===" + true);
} else {
//Redraw Polyline
}
}
UpdatePoliline();
于 2018-09-11T12:40:58.053 回答