Android Open Source - TravelReminder Directions

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Back to project page TravelReminder.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.ganterd.travelreminder;
//www.  j av  a2s . c o m
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;

import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.os.AsyncTask;

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

public class Directions {
  protected LatLng origin;
  protected LatLng destination;
  protected OnDirectionsReadyListener listener;
  protected int mode = Reminder.MODE_DRIVING; // See Reminder class for modes
  protected Date departureTime = new Date();
  
  public interface OnDirectionsReadyListener{
    public void onDirectionsReady(JSONObject directions);
  }
  
  public void setDetailsFromReminder(Reminder r){
    this.setOrigin(r.getOriginLatLng());
    this.setDestination(r.getDestinationLatLng());
    this.mode = r.getTravelMode();
  }
  
  public void setOrigin(LatLng origin){
    this.origin = origin;
  }
  
  public void setDestination(LatLng destination){
    this.destination = destination;
  }
  
  public void setMode(int mode){
    this.mode = mode;
  }
  
  public void requestDirections(OnDirectionsReadyListener listener){
    this.listener = listener;
    new Requestor().execute();
  }
        
  public static PolylineOptions getDirectionsPath(JSONObject directions){
    PolylineOptions polyLine = new PolylineOptions();
    
    try {
      
      
      JSONArray routes = directions.getJSONArray("routes");
      
      if(routes.length() > 0){
        JSONObject route = (JSONObject) routes.get(0);
        if(route.has("overview_polyline")){
          JSONObject overview_polyline = (JSONObject)route.get("overview_polyline");
          
          ArrayList<LatLng> points = decodePoly(overview_polyline.getString("points"));
          for(LatLng p : points){
            polyLine.add(p);
          }
        }
      }
    } catch (JSONException e) {
      e.printStackTrace();
    }
    
    return polyLine;
  }
  
  private class Requestor extends AsyncTask<Void, Void, JSONObject>{
    @Override
    protected JSONObject doInBackground(Void... params){
      String url = "http://maps.googleapis.com/maps/api/directions/json?";
      url += "origin=" + origin.latitude + "," + origin.longitude;
      url += "&destination=" + destination.latitude + "," + destination.longitude;
      url += "&sensor=false";
      
      String modeString = "";
      switch(mode){
      case Reminder.MODE_DRIVING:
        modeString = "driving";
        break;
      case Reminder.MODE_WALKING:
        modeString = "walking";
        break;
      case Reminder.MODE_CYCLING:
        modeString = "bicycling";
        break;
      case Reminder.MODE_PUBLIC_TRANSIT:
        modeString = "transit";
        break;
      default:
        modeString = "walking";
      }
      url += "&mode=" + modeString;
      
      if(departureTime != null){
        String t = Long.toString(departureTime.getTime()/1000);
        url += "&departure_time=" + t;
      }
      
      HttpClient httpClient = new DefaultHttpClient();
      HttpContext localContext = new BasicHttpContext();
      HttpGet httpGet = new HttpGet(url);
      
      try {
        
        HttpResponse resp = httpClient.execute(httpGet, localContext);
        
        if(resp.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
          String data = EntityUtils.toString(resp.getEntity());
          JSONObject obj;
          try {
            obj = new JSONObject(data);
            return obj;
          } catch (JSONException e) {
            e.printStackTrace();
          }
          
        }
        
      } catch (ClientProtocolException e) {
        e.printStackTrace();
      } catch (IOException e) {
        e.printStackTrace();
      }
      
      return new JSONObject();
    }
    
    @Override
    protected void onPostExecute(JSONObject directions){
      listener.onDirectionsReady(directions);
    }
  }
  
  private static ArrayList<LatLng> decodePoly(String encoded) {
    ArrayList<LatLng> points = 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 position = new LatLng((double) lat / 1E5, (double) lng / 1E5);
            points.add(position);
        }
        
        return points;
  }
}

Java Source Code List

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