问题描述
我有这个倾向：
list.add(new LatLng(51.410831451416016,16.195022583007812));
list.add(new LatLng(51.40906524658203,16.19700813293457));
list.add(new LatLng(51.406280517578125,16.200498580932617));
list.add(new LatLng(51.40361022949219,16.20193862915039));
list.add(new LatLng(51.400203704833984,16.20381736755371));
list.add(new LatLng(51.400081634521484,16.213804244995117));
list.add(new LatLng(51.40199661254883,16.216102600097656));
list.add(new LatLng(51.40852355957031,16.219417572021484));
list.add(new LatLng(51.43153762817383,16.23755645751953));
list.add(new LatLng(51.447242736816406,16.245569229125977));
list.add(new LatLng(51.45175552368164,16.234098434448242));
list.add(new LatLng(51.45286178588867,16.24496841430664));
list.add(new LatLng(51.46625900268555,16.2692928314209));
list.add(new LatLng(51.47911071777344,16.266849517822266));
list.add(new LatLng(51.50560760498047,16.268840789794922));
list.add(new LatLng(51.510677337646484,16.259723663330078));
list.add(new LatLng(51.510677337646484,16.259723663330078));
list.add(new LatLng(51.50559997558594,16.2688045501709));
list.add(new LatLng(51.476688385009766,16.267772674560547));
list.add(new LatLng(51.46686935424805,16.270612716674805));
list.add(new LatLng(51.451759338378906,16.234111785888672));
list.add(new LatLng(51.45033264160156,16.244768142700195));
list.add(new LatLng(51.44853591918945,16.24496841430664));
list.add(new LatLng(51.43154525756836,16.237483978271484));
list.add(new LatLng(51.40877151489258,16.21938133239746));
我想获取路线并将其绘制在地图上。
我创建了一种方法来生成路线beetwen两个poit。
private class DownloadTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... url) {
String data = "";
try {
data = downloadUrl(url[0]);
} catch (Exception e) {
Log.d("Background Task", e.toString());
}
return data;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
ParserTask parserTask = new ParserTask();
parserTask.execute(result);
}
}
private class ParserTask extends AsyncTask<String, Integer, List<List<HashMap<String, String>>>> {
@Override
protected List<List<HashMap<String, String>>> doInBackground(String... jsonData) {
JSONObject jObject;
List<List<HashMap<String, String>>> routes = null;
try {
jObject = new JSONObject(jsonData[0]);
DirectionsJSONParser parser = new DirectionsJSONParser();
routes = parser.parse(jObject);
} catch (Exception e) {
e.printStackTrace();
}
return routes;
}
@Override
protected void onPostExecute(List<List<HashMap<String, String>>> result) {
ArrayList points = null;
PolylineOptions lineOptions = null;
MarkerOptions markerOptions = new MarkerOptions();
for (int i = 0; i < result.size(); i++) {
points = new ArrayList();
lineOptions = new PolylineOptions();
List<HashMap<String, String>> path = result.get(i);
for (int j = 0; j < path.size(); j++) {
HashMap<String, String> point = path.get(j);
double lat = Double.parseDouble(point.get("lat"));
double lng = Double.parseDouble(point.get("lng"));
LatLng position = new LatLng(lat, lng);
points.add(position);
}
lineOptions.addAll(points);
lineOptions.width(12);
lineOptions.color(Color.RED);
lineOptions.geodesic(true);
}
mMap.addPolyline(lineOptions);
}
}
private String getDirectionsUrl(LatLng origin, LatLng dest) {
// Origin of route
String str_origin = "origin=" + origin.latitude + "," + origin.longitude;
// Destination of route
String str_dest = "destination=" + dest.latitude + "," + dest.longitude;
// Sensor enabled
String sensor = "sensor=false";
String mode = "mode=driving";
// Building the parameters to the web service
String parameters = str_origin + "&" + str_dest + "&" + sensor + "&" + mode;
// Output format
String output = "json";
// Building the url to the web service
String url = "https://maps.googleapis.com/maps/api/directions/" + output + "?" + parameters;
return url;
}
private String downloadUrl(String strUrl) throws IOException {
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try {
URL url = new URL(strUrl);
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.connect();
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
sb.append(line);
}
data = sb.toString();
br.close();
} catch (Exception e) {
Log.d("Exception", e.toString());
} finally {
iStream.close();
urlConnection.disconnect();
}
return data;
}
有时我有300点，下载1点到2点，然后2点到3点等路线。这样做是更好的主意？我所做的事情持续了很长时间，并且我掌握了很多信息。
1楼
您已使用此代码从您的航路点获取路线，我已在您的指南代码中进行了评论。
public class DirectionFinder {
// this is directio api URL
private static final String DIRECTION_URL_API = "https://maps.googleapis.com/maps/api/directions/json?";
// your api key
private static final String GOOGLE_API_KEY = "YOUR_API_KEY";
// your origin point latlong
LatLng originlatlong;
// your destinatio point latlong
LatLng destinationlatlong;
// your array list of waypoints
ArrayList<LatLng> waypoints;
// adding way points to arraylist
void addwaypoints(){
waypoints = new ArrayList<>()
waypoints.add(new LatLng(51.410831451416016,16.195022583007812));
waypoints.add(new LatLng(51.40906524658203,16.19700813293457));
waypoints.add(new LatLng(51.406280517578125,16.200498580932617));
waypoints.add(new LatLng(51.40361022949219,16.20193862915039));
waypoints.add(new LatLng(51.400203704833984,16.20381736755371));
waypoints.add(new LatLng(51.400081634521484,16.213804244995117));
waypoints.add(new LatLng(51.40199661254883,16.216102600097656));
waypoints.add(new LatLng(51.40852355957031,16.219417572021484));
waypoints.add(new LatLng(51.43153762817383,16.23755645751953));
waypoints.add(new LatLng(51.447242736816406,16.245569229125977));
waypoints.add(new LatLng(51.45175552368164,16.234098434448242));
waypoints.add(new LatLng(51.45286178588867,16.24496841430664));
waypoints.add(new LatLng(51.46625900268555,16.2692928314209));
waypoints.add(new LatLng(51.47911071777344,16.266849517822266));
waypoints.add(new LatLng(51.50560760498047,16.268840789794922));
waypoints.add(new LatLng(51.510677337646484,16.259723663330078));
waypoints.add(new LatLng(51.510677337646484,16.259723663330078));
waypoints.add(new LatLng(51.50559997558594,16.2688045501709));
waypoints.add(new LatLng(51.476688385009766,16.267772674560547));
waypoints.add(new LatLng(51.46686935424805,16.270612716674805));
waypoints.add(new LatLng(51.451759338378906,16.234111785888672));
waypoints.add(new LatLng(51.45033264160156,16.244768142700195));
waypoints.add(new LatLng(51.44853591918945,16.24496841430664));
waypoints.add(new LatLng(51.43154525756836,16.237483978271484));
waypoints.add(new LatLng(51.40877151489258,16.21938133239746));
}
// your async task execute
//new DirectionFinder().execute(); like this
public void execute() throws UnsupportedEncodingException {
new DownloadRawData().execute(createUrlwaypoints());
}
// url create with waypoints
private String createUrlwaypoints() throws UnsupportedEncodingException {
String wayPointss = "";
for (int i = 0;i<waypoints.size();i++){
if (i==(waypoints.size()-1)){
wayPointss += ""+waypoints.get(i).latitude+","+waypoints.get(i).longitude+"";
}else {
wayPointss += "" + waypoints.get(i).latitude + "," + waypoints.get(i).longitude + "|";
}
}
return DIRECTION_URL_API + "origin=" + originlatlong.latitude+","+originlatlong.longitude + "&destination=" + destinationlatlong.latitude+","+destinationlatlong.longitude + "&waypoints=optimize:true|"+wayPointss+"|&key=" + GOOGLE_API_KEY;
}
// async task to download routes
private class DownloadRawData extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
String link = params[0];
try {
URL url = new URL(link);
InputStream is = url.openConnection().getInputStream();
StringBuffer buffer = new StringBuffer();
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
String line;
while ((line = reader.readLine()) != null) {
buffer.append(line + "\n");
}
return buffer.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String res) {
try {
parseJSon(res);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
private void parseJSon(String data) throws JSONException {
if (data == null)
return;
// here Route is my getter setter model class that have some parametes like distance,duration,etc..
List<Route> routes = new ArrayList<Route>();
JSONObject jsonData = new JSONObject(data);
JSONArray jsonRoutes = jsonData.getJSONArray("routes");
for (int i = 0; i < jsonRoutes.length(); i++) {
JSONObject jsonRoute = jsonRoutes.getJSONObject(i);
Route route = new Route();
JSONObject overview_polylineJson = jsonRoute.getJSONObject("overview_polyline");
JSONArray jsonLegs = jsonRoute.getJSONArray("legs");
JSONObject jsonLeg = jsonLegs.getJSONObject(0);
JSONObject jsonDistance = jsonLeg.getJSONObject("distance");
JSONObject jsonDuration = jsonLeg.getJSONObject("duration");
JSONObject jsonEndLocation = jsonLeg.getJSONObject("end_location");
JSONObject jsonStartLocation = jsonLeg.getJSONObject("start_location");
JSONArray jsonArray = jsonRoute.getJSONArray("waypoint_order");
route.distance = new Distance(jsonDistance.getString("text"), jsonDistance.getInt("value"));
route.duration = new Duration(jsonDuration.getString("text"), jsonDuration.getInt("value"));
route.endAddress = jsonLeg.getString("end_address");
route.startAddress = jsonLeg.getString("start_address");
route.startLocation = new LatLng(jsonStartLocation.getDouble("lat"), jsonStartLocation.getDouble("lng"));
route.endLocation = new LatLng(jsonEndLocation.getDouble("lat"), jsonEndLocation.getDouble("lng"));
route.points = decodePolyLine(overview_polylineJson.getString("points"));
int[] indexes = new int[jsonArray.length()];
for (int index = 0;index<jsonArray.length();index++){
indexes[index] = (int) jsonArray.get(index);
}
route.indexes = indexes;
routes.add(route);
}
// read all data and you can here put code to plot route on map
drawOnMap(routes);
}
private List<LatLng> decodePolyLine(final String poly) {
int len = poly.length();
int index = 0;
List<LatLng> decoded = new ArrayList<LatLng>();
int lat = 0;
int lng = 0;
while (index < len) {
int b;
int shift = 0;
int result = 0;
do {
b = poly.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lat += dlat;
shift = 0;
result = 0;
do {
b = poly.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lng += dlng;
decoded.add(new LatLng(
lat / 100000d, lng / 100000d
));
}
return decoded;
}
void drawOnMap(ArrayList<Route> routes){
polyLinePaths = new ArrayList<>();
originMarkers = new ArrayList<>();
destinationMarker = new ArrayList<>();
for (Route route : routes) {
mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.fromResource(R.drawable.startflags))
.title(route.startAddress)
.position(originPoints));
mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.fromResource(R.drawable.endflags))
.title(route.endAddress)
.position(destinationPoints));
PolylineOptions polylineOptions = new PolylineOptions()
.geodesic(true)
.color(getResources().getColor(R.color.colorPrimary))
.width(5);
if (wayPoints!=null){
for (int i = 0;i<wayPoints.size();i++){
mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.fromResource(R.drawable.busstopp))
.title(wayPoints.get(i).getStopName())
.position(wayPoints.get(i).getLatLng()));
}
}
for (int i = 0; i < route.points.size(); i++) {
polylineOptions.add(route.points.get(i));
}
polyLinePaths.add(mMap.addPolyline(polylineOptions));
}
}
//路线类别
public class Route {
public Distance distance;
public Duration duration;
public String endAddress;
public LatLng endLocation;
public String startAddress;
public LatLng startLocation;
public List<LatLng> points;
public int[] indexes;
}
2楼
您正在寻找的是Waypoints 。 请参阅可选参数部分。
指定要在起点和目的地之间的路径上包括的直通或中途停留位置的中间位置数组。 航点通过将路线引导通过指定位置来更改路线。
我建议您建立从第一个点到最后一个点的路线，并将中间点作为路标传递。
包含经纬度航路点的URL示例：
https://maps.googleapis.com/maps/api/directions/json?
origin=sydney,au&destination=perth,au
&waypoints=via:-37.81223%2C144.96254%7Cvia:-34.92788%2C138.60008
&key=YOUR_API_KEY