例如，我想获取距离和持续时间 https://maps.googleapis.com/maps/api/directions/json?key=API_Key&sensor=true&language=en&origin=6.035507,116.1213559&destination=5.9699316,116.0665816。我已经知道了这两个位置之间的路线。但是我不知道如何显示距离和持续时间。需要一些帮助。我已经知道其他人已经发布了这个问题，但是由于我被认为是Android中的新秀，因此似乎无法使用我的代码。 下面是我的代码：
private void drawRoute(final LatLng yourLocation, final Request request) {
//clear all polyline
if (polyline != null)
polyline.remove();
if (request.getAddress() != null && !request.getAddress().isEmpty()) {
mService.getGeoCode(request.getAddress()).enqueue(new Callback<String>() {
@Override
public void onResponse(Call<String> call, Response<String> response) {
try {
JSONObject jsonObject = new JSONObject(response.body().toString());
String lat = ((JSONArray) jsonObject.get("results"))
.getJSONObject(0)
.getJSONObject("geometry")
.getJSONObject("location")
.get("lat").toString();
String lng = ((JSONArray) jsonObject.get("results"))
.getJSONObject(0)
.getJSONObject("geometry")
.getJSONObject("location")
.get("lng").toString();
final LatLng orderLocation = new LatLng(Double.parseDouble(lat), Double.parseDouble(lng));
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.deliverybox);
bitmap = Common.scaleBitmap(bitmap, 70, 70);
MarkerOptions marker = new MarkerOptions().icon(BitmapDescriptorFactory.fromBitmap(bitmap))
.title("Order of " + Common.currentRequest.getPhone())
.position(orderLocation);
mMap.addMarker(marker);
//draw route
mService.getDirections(yourLocation.latitude + "," + yourLocation.longitude,
orderLocation.latitude + "," + orderLocation.longitude)
.enqueue(new Callback<String>() {
@Override
public void onResponse(Call<String> call, Response<String> response) {
new ParserTask().execute(response.body().toString());
}
@Override
public void onFailure(Call<String> call, Throwable t) {
}
});
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
public void onFailure(Call<String> call, Throwable t) {
}
});
} else {
if (request.getLatLng() != null && !request.getLatLng().isEmpty()) {
String[] latLng = request.getLatLng().split(",");
LatLng orderLocation = new LatLng(Double.parseDouble(latLng[0]), Double.parseDouble(latLng[1]));
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.deliverybox);
bitmap = Common.scaleBitmap(bitmap, 70, 70);
MarkerOptions marker = new MarkerOptions().icon(BitmapDescriptorFactory.fromBitmap(bitmap))
.title("Order of " + Common.currentRequest.getPhone())
.position(orderLocation);
mMap.addMarker(marker);
mService.getDirections(mLastLocation.getLatitude() + "," + mLastLocation.getLongitude(),
orderLocation.latitude + "," + orderLocation.longitude)
.enqueue(new Callback<String>() {
@Override
public void onResponse(Call<String> call, Response<String> response) {
new ParserTask().execute(response.body().toString());
}
@Override
public void onFailure(Call<String> call, Throwable t) {
}
});
}
}
}
这是我解析Google返回的JSON对象的地方
private class ParserTask extends AsyncTask<String, Integer,
List<List<HashMap<String, String>>>> {
ProgressDialog mDialog = new ProgressDialog(TrackingOrder.this);
@Override
protected void onPreExecute() {
super.onPreExecute();
mDialog.setMessage("Please waiting...");
mDialog.show();
}
@Override
protected List<List<HashMap<String, String>>> doInBackground(String... strings) {
JSONObject jsonObject;
List<List<HashMap<String, String>>> routes = null;
try {
jsonObject = new JSONObject(strings[0]);
DirectionJSONParser parser = new DirectionJSONParser();
routes = parser.parse(jsonObject);
} catch (JSONException e) {
e.printStackTrace();
}
return routes;
}
@Override
protected void onPostExecute(List<List<HashMap<String, String>>> lists) {
mDialog.dismiss();
ArrayList points = null;
PolylineOptions lineOptions = null;
for (int i = 0; i < lists.size(); i++) {
points = new ArrayList();
lineOptions = new PolylineOptions();
List<HashMap<String, String>> path = lists.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(8);
lineOptions.color(Color.RED);
lineOptions.geodesic(true);
}
mMap.addPolyline(lineOptions);
}
}
最后是我的DirectionJsonParser.java
public class DirectionJSONParser {
/**
* Receives a JSONObject and returns a list of lists containing latitude and longitude
*/
public List<List<HashMap<String, String>>> parse(JSONObject jObject) {
List<List<HashMap<String, String>>> routes = new ArrayList<List<HashMap<String, String>>>();
JSONArray jRoutes = null;
JSONArray jLegs = null;
JSONArray jSteps = null;
try {
jRoutes = jObject.getJSONArray("routes");
/** Traversing all routes */
for (int i = 0; i < jRoutes.length(); i++) {
jLegs = ((JSONObject) jRoutes.get(i)).getJSONArray("legs");
List path = new ArrayList<HashMap<String, String>>();
/** Traversing all legs */
for (int j = 0; j < jLegs.length(); j++) {
jSteps = ((JSONObject) jLegs.get(j)).getJSONArray("steps");
/** Traversing all steps */
for (int k = 0; k < jSteps.length(); k++) {
String polyline = "";
polyline = (String) ((JSONObject) ((JSONObject) jSteps.get(k)).get("polyline")).get("points");
List list = decodePoly(polyline);
/** Traversing all points */
for (int l = 0; l < list.size(); l++) {
HashMap<String, String> hm = new HashMap<String, String>();
hm.put("lat", Double.toString(((LatLng) list.get(l)).latitude));
hm.put("lng", Double.toString(((LatLng) list.get(l)).longitude));
path.add(hm);
}
}
routes.add(path);
}
}
} catch (JSONException e) {
e.printStackTrace();
} catch (Exception e) {
}
return routes;
}
/**
* Method to decode polyline points
* Courtesy : http://jeffreysambells.com/2010/05/27/decoding-polylines-from-google-maps-direction-api-with-java
*/
private List decodePoly(String encoded) {
List poly = new ArrayList();
int index = 0, len = encoded.length();
int lat = 0, lng = 0;
while (index < len) {
int b, shift = 0, result = 0;
do {
b = encoded.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 = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lng += dlng;
LatLng p = new LatLng((((double) lat / 1E5)),
(((double) lng / 1E5)));
poly.add(p);
}
return poly;
}
}
答案 0 :(得分：1)
获得两点之间的路线后，您将得到如下距离和持续时间
JSONArray routes = jsonObject.getJSONArray("routes");
JSONObject object = routes.getJSONObject(0);
JSONArray legs = object.getJSONArray("legs");
JSONObject legsObjects = legs.getJSONObject(0);
//get the distance
JSONObject distance = legsObjects.getJSONObject("distance");
String distance = distance.getString("text");
//get the time
JSONObject time = legsObjects.getJSONObject("duration");
String duration = time.getString("text");