als List<LatLng>
repräsentiert eine Route gegeben, berechnet er diese Funktion den Punkt auf der Route, die von Reisen distance
Meter von origin
auf dieser Strecke führt (die Google Maps API Utility Library mit einigen Berechnungen zu tun):
private LatLng extrapolate(List<LatLng> path, LatLng origin, float distance) {
LatLng extrapolated = null;
if (!PolyUtil.isLocationOnPath(origin, path, false, 1)) { // If the location is not on path non geodesic, 1 meter tolerance
return null;
}
float accDistance = 0f;
boolean foundStart = false;
List<LatLng> segment = new ArrayList<>();
for (int i = 0; i < path.size() - 1; i++) {
LatLng segmentStart = path.get(i);
LatLng segmentEnd = path.get(i + 1);
segment.clear();
segment.add(segmentStart);
segment.add(segmentEnd);
double currentDistance = 0d;
if (!foundStart) {
if (PolyUtil.isLocationOnPath(origin, segment, false, 1)) {
foundStart = true;
currentDistance = SphericalUtil.computeDistanceBetween(origin, segmentEnd);
if (currentDistance > distance) {
double heading = SphericalUtil.computeHeading(origin, segmentEnd);
extrapolated = SphericalUtil.computeOffset(origin, distance - accDistance, heading);
break;
}
}
} else {
currentDistance = SphericalUtil.computeDistanceBetween(segmentStart, segmentEnd);
if (currentDistance + accDistance > distance) {
double heading = SphericalUtil.computeHeading(segmentStart, segmentEnd);
extrapolated = SphericalUtil.computeOffset(segmentStart, distance - accDistance, heading);
break;
}
}
accDistance += currentDistance;
}
return extrapolated;
}
Hier sind einige Tests:
List<LatLng> route = new ArrayList<>();
route.add(new LatLng(40, 4));
route.add(new LatLng(40.1, 4));
route.add(new LatLng(40.1, 4.1));
route.add(new LatLng(40.2, 4.1));
route.add(new LatLng(40.2, 4.2));
route.add(new LatLng(40.3, 4.2));
route.add(new LatLng(40.3, 4.3));
LatLng origin;
LatLng extrapolated;
origin = new LatLng(40.1, 4.05);
extrapolated = extrapolate(route, origin, 30000);
Log.e("Extrapolated1", "" + extrapolated); // lat/lng: (40.25517043951189,4.2)
origin = new LatLng(40.05, 4);
extrapolated = extrapolate(route, origin, 100);
Log.e("Extrapolated2", "" + extrapolated); // lat/lng: (40.05089932033549,4.0)
origin = new LatLng(40.05, 4);
extrapolated = extrapolate(route, origin, 50000);
Log.e("Extrapolated3", "" + extrapolated); // lat/lng: (40.300010207449226,4.261348349980259)
origin = new LatLng(40.05, 4);
extrapolated = extrapolate(route, origin, 100000);
Log.e("Extrapolated4", "" + extrapolated); // null (result out of the route)
Kann die google Richtungen API nicht hat irgendeine Art von Lösung für das https: //developers.google.com/maps/documentation/directions/intro#Waypoints – commonSenseCode
Nicht, dass ich – Ken
sehen kann Ich denke, Sie suchen nach diesem https://developer.android.com/reference/android/telephony/TelephonyManager.html#getCellLocation() –