Android Open Source - bodyguard Directions J S O N Parser

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Back to project page bodyguard.

License

The source code is released under:

GNU General Public License

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Java Source Code

package com.example.bodyguard;
//from ww w  . j  a v  a 2  s.  com
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.google.android.gms.maps.model.LatLng;

public class DirectionsJSONParser {

  /** 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");
        @SuppressWarnings("rawtypes")
        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<LatLng> 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(list.get(l).latitude) );
                            hm.put("lng", Double.toString(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
     * decoding-polylines-from-google-maps-direction-api-with-java
     * */
     private List<LatLng> decodePoly(String encoded) {
  
         List<LatLng> poly = new ArrayList<LatLng>();
         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(((lat / 1E5)),
                                  ((lng / 1E5)));
             poly.add(p);
         }
         return poly;
     }
 }

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