问题
After using gps for geolocalization, i want to create an line to show the itinary between two points. I know i need to use the polyline but after the JSON parsing, I don't know how to use the polyline options and I don't know how to use the part of Json named "steps". For the Http conection, i use the Volley Library. This my code:
public void geoLocate(View view){
String start = start_address.getText().toString();
String destination = destination_address.getText().toString();
Geocoder gc = new Geocoder(getActivity());
try {
List<android.location.Address> list = gc.getFromLocationName(start,1);
final Address adress1 = list.get(0);
String start_adress = adress1.getLocality();
double lat_start = adress1.getLatitude();
double lng_start = adress1.getLongitude();
list = gc.getFromLocationName(destination,1);
Address adress2 = list.get(0);
String destination_adress = adress2.getLocality();
double lat_destination = adress2.getLatitude();
double lng_destination = adress2.getLongitude();
if (start_marker != null || destination_marker != null){
start_marker.remove();
destination_marker.remove();
}
options_start = new MarkerOptions()
.title(start_adress)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN))
.position(new LatLng(lat_start, lng_start));
start_marker = mGoogleMap.addMarker(options_start);
options_destination = new MarkerOptions()
.title(destination_adress)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE))
.position(new LatLng(lat_destination, lng_destination));
destination_marker = mGoogleMap.addMarker(options_destination);
reservation.setClickable(true);
reservation.setEnabled(true);
reservation.setTextColor(getResources().getColor(R.color.white));
reservation.setBackgroundColor(getResources().getColor(R.color.colorPrimary));
if(reservation.isClickable()) {
reservation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
}
LatLngBounds.Builder builder = new LatLngBounds.Builder();
builder.include(start_marker.getPosition());
builder.include(destination_marker.getPosition());
LatLngBounds bounds = builder.build();
final StringBuilder url = new StringBuilder("http://maps.googleapis.com/maps/api/directions/json?sensor=false&language=fr");
url.append("&origin=");
url.append(start.replace(" ", "+"));
url.append("&destination=");
url.append(destination.replace(" ", "+"));
final Response.Listener<String> responseListener = new Response.Listener<String>() {
@Override
public void onResponse(final String response) {
try {
JSONObject jsonResponse = new JSONObject(response);
String status = jsonResponse.getString("status");
if (status.equals("OK")){
JSONArray parentArray = jsonResponse.getJSONArray("routes");
JSONObject routes = parentArray.getJSONObject(0);
if(routes != null){
JSONArray legsArray = routes.getJSONArray("legs");
JSONObject legsObject = legsArray.getJSONObject(0);
if (legsObject != null){
JSONObject distance = legsObject.getJSONObject("distance");
if (distance != null){
String distanceText = distance.getString("text");
distance_matrix.append(" "+distanceText);
}
JSONArray stepsArray = legsObject.getJSONArray("steps");
JSONObject stepsObject = stepsArray.getJSONObject(0);
if (stepsObject != null){
}
}
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
};
ItineraireRequest itineraireRequest = new ItineraireRequest(url.toString(), responseListener);
RequestQueue queue = Volley.newRequestQueue(getActivity());
queue.add(itineraireRequest);
int padding = 125; // offset from edges of the map in pixels
CameraUpdate cu = CameraUpdateFactory.newLatLngBounds(bounds, padding);
mGoogleMap.animateCamera(cu);
} catch (IOException e) {
e.printStackTrace();
}
}
Can you give a solution adapted to my code to make that, please?
回答1:
I think this could help, the "getDocument()" do all the work
@Override
public void onMapReady(GoogleMap googleMap) {
GMapV2Direction md = new GMapV2Direction();
Document doc = md.getDocument(formatAddress(ORIGIN_TEXT, formatAddress(DESTINATION_TEXT, MODE, getApplicationContext());
if (doc != null) {
int duration = md.getDurationValue(doc);
if (duration > 0) {
try {
ArrayList<LatLng> directionPoint = md.getDirection(doc);
PolylineOptions rectLine = new PolylineOptions().width(9).color(R.color.splash_blue).geodesic(true);
for (int i = 0; i < directionPoint.size(); i++) {
rectLine.add(directionPoint.get(i));
}
AccessLocationActivity.this.mMap.addPolyline(rectLine);
} catch (Exception e) {
e.printStackTrace();
}
}
UPDATED
try this
public void geoLocate(View view){
String start = start_address.getText().toString();
String destination = destination_address.getText().toString();
Geocoder gc = new Geocoder(getActivity());
try {
List<android.location.Address> list = gc.getFromLocationName(start,1);
final Address adress1 = list.get(0);
String start_adress = adress1.getLocality();
double lat_start = adress1.getLatitude();
double lng_start = adress1.getLongitude();
list = gc.getFromLocationName(destination,1);
Address adress2 = list.get(0);
String destination_adress = adress2.getLocality();
double lat_destination = adress2.getLatitude();
double lng_destination = adress2.getLongitude();
if (start_marker != null || destination_marker != null){
start_marker.remove();
destination_marker.remove();
}
options_start = new MarkerOptions()
.title(start_adress)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN))
.position(new LatLng(lat_start, lng_start));
start_marker = mGoogleMap.addMarker(options_start);
options_destination = new MarkerOptions()
.title(destination_adress)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE))
.position(new LatLng(lat_destination, lng_destination));
destination_marker = mGoogleMap.addMarker(options_destination);
reservation.setClickable(true);
reservation.setEnabled(true);
reservation.setTextColor(getResources().getColor(R.color.white));
reservation.setBackgroundColor(getResources().getColor(R.color.colorPrimary));
if(reservation.isClickable()) {
reservation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
}
LatLngBounds.Builder builder = new LatLngBounds.Builder();
builder.include(start_marker.getPosition());
builder.include(destination_marker.getPosition());
LatLngBounds bounds = builder.build();
final StringBuilder url = new StringBuilder("http://maps.googleapis.com/maps/api/directions/json?sensor=false&language=fr");
url.append("&origin=");
url.append(start.replace(" ", "+"));
url.append("&destination=");
url.append(destination.replace(" ", "+"));
GMapV2Direction md = new GMapV2Direction();
Document doc = md.getDocument(formatAddress(start), formatAddress(destination), GMapV2Direction.MODE_DRIVING, getApplicationContext());
if (doc != null) {
int duration = md.getDurationValue(doc);
if (duration > 0) {
try {
ArrayList<LatLng> directionPoint = md.getDirection(doc);
PolylineOptions rectLine = new PolylineOptions().width(9).color(R.color.colorPrimary).geodesic(true);
for (int i = 0; i < directionPoint.size(); i++) {
rectLine.add(directionPoint.get(i));
}
mGoogleMap.addPolyline(rectLine);
} catch (Exception e) {
e.printStackTrace();
}
} catch (IOException e) {
e.printStackTrace();
}
}
回答2:
This is a great wrapper on top of the Google DirectionsAPI if you are willing to give it a shot.
More detailed explanation here.
来源：https://stackoverflow.com/questions/38918814/create-itinary-google-maps-android