我想将Google地图上的标记从源头移动到目的地，如Uber或Ola，我正在使用谷歌地图，我是新手，请帮助我如何实现......？
我的代码是：
public void onMapReady（GoogleMap googleMap）{
GoogleMap gMap = googleMap;
addMarks1(gMap);
if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
gMap.setMyLocationEnabled(true);
gMap.getUiSettings().setZoomControlsEnabled(true);
// Turns on 3D buildings
gMap.setBuildingsEnabled(true);
}
private void addMarks1(GoogleMap googleMap) {
googleMap.clear();
// updateRouteOnMAp();
double d_lat=Double.valueOf(rideDetailSessionManager.getColumnFromTaxiDriver(RideDetailSessionManager.KEY_START_LAT));
double d_loing=Double.valueOf(rideDetailSessionManager.getColumnFromTaxiDriver(RideDetailSessionManager.KEY_START_LNG));
fromPosition=new LatLng(d_lat,d_loing);
toPosition=new LatLng(Double.valueOf(rideDetailSessionManager.getColumnFromTaxiDriver(RideDetailSessionManager.KEY_END_LAT)),
Double.valueOf(rideDetailSessionManager.getColumnFromTaxiDriver(RideDetailSessionManager.KEY_END_LNG)));
List<Marker> markersList = new ArrayList<Marker>();
Marker StartLatLon= googleMap.addMarker(new MarkerOptions().position(fromPosition).title("Start Point").icon(BitmapDescriptorFactory.fromResource(R.drawable.red_car_image)));
Marker EndLatLon= googleMap.addMarker(new MarkerOptions().position(toPosition).icon(BitmapDescriptorFactory.fromResource(R.drawable.red_car_image)));
markersList.add(StartLatLon);
markersList.add(EndLatLon);
builder = new LatLngBounds.Builder();
for (Marker m : markersList) {
builder.include(m.getPosition());
}
int padding = 150;
LatLngBounds bounds = builder.build();
cu = CameraUpdateFactory.newLatLngBounds(bounds, padding);
googleMap.animateCamera(cu);
traceMe(googleMap);
}
private void traceMe(final GoogleMap googleMap) {
String srcParam;
String destParam;
String startLat=rideDetailSessionManager.getColumnFromTaxiDriver(RideDetailSessionManager.KEY_START_LAT);
String startLng=rideDetailSessionManager.getColumnFromTaxiDriver(RideDetailSessionManager.KEY_START_LNG);
GPSTracker gpsTracker=new GPSTracker(getActivity());
srcParam = startLat + "," + startLng;
destParam = gpsTracker.getLatitude() + "," + gpsTracker.getLongitude();
Log.d("drop lat pp2", ":" + destParam);
String modes[] = {"driving", "walking", "bicycling", "transit"};
String url = "https://maps.googleapis.com/maps/api/directions/json?origin=" + srcParam + "&destination=" + destParam + "&sensor=false&units=metric&mode=driving";
StringRequest jsonObjectRequest = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d("dkp lat long", ":" + response);
JSONObject jsonObject=null;
try {
jsonObject=new JSONObject(response);
} catch (JSONException e) {
e.printStackTrace();
}
MapDirectionsParser parser = new MapDirectionsParser();
List<List<HashMap<String, String>>> routes = parser.parse(jsonObject);
for (int i = 0; i < routes.size(); i++) {
points = new ArrayList<LatLng>();
List<HashMap<String, String>> path = routes.get(i);
Log.d("dkp lat long", ":" + path);
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);
}
}
Log.d("dkp points lat long", ":" + points);
drawPoints(points, googleMap);
String str_dist=parser.distance();
//String str_dur=parser.duration();
if (!str_dist.equals("null"))
{
distance= Integer.parseInt(str_dist);
//estimate_distance= (distance/100)+50;
//rideEstimateDistance.setText((estimate_distance-50)+"-"+estimate_distance);
Log.d("dkp kkk distance", ":" + distance);
}
/*if (!str_dur.equals("null"))
{
int duration=Integer.parseInt(parser.duration());
estimate_duration= duration/60;
ideEstimateDistance.setText((estimate_distance-50)+"-"+estimate_distance);
Log.d("dkp kkk duration", ":" + duration);
}*/
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if (error instanceof TimeoutError || error instanceof NoConnectionError) {
Log.d("error ocurred", "TimeoutError");
//Toast.makeText(getActivity(), "TimeoutError", Toast.LENGTH_LONG).show();
} else if (error instanceof AuthFailureError) {
Log.d("error ocurred", "AuthFailureError");
//Toast.makeText(getActivity(), "AuthFailureError", Toast.LENGTH_LONG).show();
} else if (error instanceof ServerError) {
Log.d("error ocurred", "ServerError");
// emailEdt.requestFocus();
// Toast.makeText(getActivity(), "Please enter valid email or password", Toast.LENGTH_LONG).show();
// Toast.makeText(getActivity(), "ServerError", Toast.LENGTH_LONG).show();
} else if (error instanceof NetworkError) {
Log.d("error ocurred", "NetworkError");
//Toast.makeText(getActivity(), "NetworkError", Toast.LENGTH_LONG).show();
} else if (error instanceof ParseError) {
Log.d("error ocurred", "ParseError");
//Toast.makeText(getActivity(), "ParseError", Toast.LENGTH_LONG).show();
}
}
});
// MyApplication.getInstance().addToRequestQueue(jsonObjectRequest, "jreq");
RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
requestQueue.add(jsonObjectRequest);
}
private void drawPoints(ArrayList<LatLng> points, GoogleMap mMaps) {
if (points == null) {
return;
}
traceOfMe = points;
PolylineOptions polylineOpt = new PolylineOptions();
for (LatLng latlng : traceOfMe) {
polylineOpt.add(latlng);
}
polylineOpt.color(Color.BLUE);
if (mPolyline != null) {
mPolyline.remove();
mPolyline = null;
}
if (mMaps != null) {
mPolyline = mMaps.addPolyline(polylineOpt);
} else {
}
if (mPolyline != null)
mPolyline.setWidth(7);
}
答案 0 :(得分：0)
您必须使用googleMap.clear（）从地图中删除标记，然后在新位置重新绘制标记。