#android #google-maps #google-maps-android-api-2
#Android #google-карты #google-maps-android-api-2
Вопрос:
после получения следующего ответа от Google direction api, как я могу отобразить дорогу на карте, как показано на рисунке ниже? и как я могу переключиться на просмотр улиц? .
вот мой код :
RequestQueue queue = Volley.newRequestQueue(this);
String url = "https://maps.googleapis.com/maps/api/directions/json?origin=Disneylandamp;destination=Universal Studios Hollywood4amp;key=AIzaSyBX40zJvRu0PBVs5iA0xG_cmdpVAUKYmmQ";
// Request a string response from the provided URL.
StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
// Display the first 500 characters of the response string.
Log.e("Response is: ", response.toString());
////////////////json response //////////
try {
String responseString;
JSONObject responseObject = (JSONObject) new JSONTokener(response.toString()).nextValue();
responseString = responseObject.getString("status");
JSONArray routesArray = responseObject.getJSONArray("routes");
JSONObject route = routesArray.getJSONObject(0);
JSONArray legs;
JSONObject leg;
JSONArray steps;
JSONObject dist;
Integer distance;
if (route.has("legs")) {
legs = route.getJSONArray("legs");
leg = legs.getJSONObject(0);
steps = leg.getJSONArray("steps");
int nsteps = steps.length();
for (int i = 0; i < nsteps; i ) {
JSONObject step = steps.getJSONObject(i);
if (step.has("distance")) {
dist = (JSONObject) step.get("distance");
if (dist.has("value"))
distance = (Integer) dist.get("value");
}
}
} else
responseString = "not found";
} catch (Exception e) {
e.printStackTrace();
}
////////////////////////////
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("Response is: ", "error");
}
});
вот ответ :
{
"geocoded_waypoints":[
{
"geocoder_status":"OK",
"place_id":"ChIJRVY_etDX3IARGYLVpoq7f68",
"types":[
"bus_station",
"establishment",
"point_of_interest",
"transit_station"
]
},
{
"geocoder_status":"OK",
"partial_match":true,
"place_id":"ChIJE0RfH0m-woAROpQUDVXcp1A",
"types":[
"route"
]
}
],
"routes":[
{
"bounds":{
"northeast":{
"lat":34.1380726,
"lng":-117.9143879
},
"southwest":{
"lat":33.8068768,
"lng":-118.3545268
}
},
"copyrights":"Map data ©2016 Google",
"legs":[
{
"distance":{
"text":"36.5 mi",
"value":58724
},
"duration":{
"text":"53 mins",
"value":3192
},
"end_address":"Studio way, North Hollywood, CA 91602, USA",
"end_location":{
"lat":34.1378505,
"lng":-118.3545268
},
"start_address":"Disneyland (Harbor Blvd.), S Harbor Blvd, Anaheim, CA 92802, USA",
"start_location":{
"lat":33.8098177,
"lng":-117.9154353
},
"steps":[
{
"distance":{
"text":"0.2 mi",
"value":310
},
"duration":{
"text":"1 min",
"value":79
},
"end_location":{
"lat":33.8070347,
"lng":-117.9154133
},
"html_instructions":"Head u003cbu003esouthu003c/bu003e on u003cbu003eS Harbor Blvdu003c/bu003e",
"polyline":{
"points":"knjmEnjunUNAb@@Z?RALA`@B~D?n@ChDA"
},
"start_location":{
"lat":33.8098177,
"lng":-117.9154353
},
"travel_mode":"DRIVING"
},
{
"distance":{
"text":"0.6 mi",
"value":1039
},
"duration":{
"text":"3 mins",
"value":195
},
"end_location":{
"lat":33.8159247,
"lng":-117.9152992
},
"html_instructions":"Make a u003cbu003eU-turnu003c/bu003e at u003cbu003eDisney Wayu003c/bu003e",
"maneuver":"uturn-left",
"polyline":{
"points":"}|imEhjunU\??_@]@cIBgC?Q@sD?wDEi@A{@?s@AqB?M@M?aB?oDB_@?y@?M?O?IAE?I?O?]?C?s@?{@@K?m@D"
},
"start_location":{
"lat":33.8070347,
"lng":-117.9154133
},
"travel_mode":"DRIVING"
},
{
"distance":{
"text":"22.9 mi",
"value":36928
},
"duration":{
"text":"27 mins",
"value":1593
},
"end_location":{
"lat":34.0255711,
"lng":-118.2060101
},
"html_instructions":" Take the ramp onto u003cbu003eI-5 Nu003c/bu0
Ответ №1:
Вы можете проанализировать ответ JSON и извлечь свойство overview_polyline из JSON. Добавьте утилиты Android map в свой файл gradle:
compile 'com.google.maps.android:android-maps-utils:0.4'
С утилями Android map у вас будет com.google.maps.android.Класс PolyUtil, который может декодировать закодированную ломаную линию из свойства overview_polyline и получать список LatLng.
Фрагмент кода может быть чем-то вроде:
MapFragment mapFrag = (MapFragment)
getFragmentManager().findFragmentById(R.id.route_map);
if(mapFrag!=null amp;amp; jsonRoute != null){
mapFrag.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(GoogleMap googleMap) {
try {
if (jsonRoute.has("status") amp;amp; jsonRoute.getString("status").equals("OK")) {
if (jsonRoute.has("routes")) {
JSONArray rts = jsonRoute.getJSONArray("routes");
if (rts != null amp;amp; rts.length() > 0 amp;amp; !rts.isNull(0)) {
JSONObject r = rts.getJSONObject(0);
if (r.has("overview_polyline") amp;amp; !r.isNull("overview_polyline")) {
JSONObject m_poly = r.getJSONObject("overview_polyline");
if (m_poly.has("points") amp;amp; !m_poly.isNull("points")) {
String enc_points = m_poly.getString("points");
List<LatLng> m_path = PolyUtil.decode(enc_points);
PolylineOptions polyOptions = new PolylineOptions().addAll(m_path);
googleMap.addPolyline(polyOptions);
LatLngBounds.Builder builder = new LatLngBounds.Builder();
for(LatLng coord : m_path){
builder.include(coord);
}
LatLngBounds m_bounds = builder.build();
googleMap.moveCamera(CameraUpdateFactory.newLatLngBounds(m_bounds, 10));
}
}
}
}
}
} catch (JSONException e) {
Log.e(LOG_TAG, "Cannot process directions JSON results", e);
}
}
});
}
Надеюсь, это поможет!