Android Open Source - SmartNavi Google Road Manager

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License

The source code is released under:
Apache License
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Java Source Code

package org.osmdroid.bonuspack.routing;
//from  ww w.j  ava 2  s .  c  o  m
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Locale;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.osmdroid.bonuspack.utils.BonusPackHelper;
import org.osmdroid.bonuspack.utils.HttpConnection;
import org.osmdroid.bonuspack.utils.PolylineEncoder;
import org.osmdroid.util.BoundingBoxE6;
import org.osmdroid.util.GeoPoint;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import android.util.Log;

/** class to get a route between a start and a destination point, 
 * going through a list of waypoints. <br>
 * https://developers.google.com/maps/documentation/directions/<br>
 * Note that displaying a route provided by Google on a non-Google map (like OSM) is not allowed by Google T&C. 
 * @author M.Kergall
 * TODO: replace GoogleDirectionsHandler mString by a StringBuilder
 */
public class GoogleRoadManager extends RoadManager {
  
  static final String GOOGLE_DIRECTIONS_SERVICE = "http://maps.googleapis.com/maps/api/directions/xml?";
  
  /**
   * Build the URL to Google Directions service returning a route in XML format
   */
  protected String getUrl(ArrayList<GeoPoint> waypoints) {
    StringBuffer urlString = new StringBuffer(GOOGLE_DIRECTIONS_SERVICE);
    urlString.append("origin=");
    GeoPoint p = waypoints.get(0);
    urlString.append(geoPointAsString(p));
    urlString.append("&destination=");
    int destinationIndex = waypoints.size()-1;
    p = waypoints.get(destinationIndex);
    urlString.append(geoPointAsString(p));
    
    for (int i=1; i<destinationIndex; i++){
      if (i == 1)
        urlString.append("&waypoints=");
      else
        urlString.append("%7C"); // the pipe (|), url-encoded
      p = waypoints.get(i);
      urlString.append(geoPointAsString(p));
    }
    urlString.append("&units=metric&sensor=false");
    Locale locale = Locale.getDefault();
    urlString.append("&language="+locale.getLanguage());
    urlString.append(mOptions);
    return urlString.toString();
  }
  
  /** 
   * @param waypoints list of GeoPoints. Must have at least 2 entries, start and end points. 
   * @return the road
   */
  @Override public Road getRoad(ArrayList<GeoPoint> waypoints) {
    String url = getUrl(waypoints);
    Log.d(BonusPackHelper.LOG_TAG, "GoogleRoadManager.getRoad:"+url);
    Road road = null;
    HttpConnection connection = new HttpConnection();
    connection.doGet(url);
    InputStream stream = connection.getStream();
    if (stream != null)
        road = getRoadXML(stream);
    connection.close();
    if (road == null || road.mRouteHigh.size()==0){
      //Create default road:
      road = new Road(waypoints);
    } else {
      //finalize road data update:
      for (RoadLeg leg : road.mLegs){
        road.mDuration += leg.mDuration;
        road.mLength += leg.mLength;
      }
      road.mStatus = Road.STATUS_OK;
    }
    Log.d(BonusPackHelper.LOG_TAG, "GoogleRoadManager.getRoad - finished");
    return road;
  }

  protected Road getRoadXML(InputStream is) {
    GoogleDirectionsHandler handler = new GoogleDirectionsHandler();
    try {
      SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
      parser.parse(is, handler);
    } catch (ParserConfigurationException e) {
      e.printStackTrace();
    } catch (SAXException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
    return handler.mRoad;
  }

}

class GoogleDirectionsHandler extends DefaultHandler {
  Road mRoad;
  RoadLeg mLeg;
  RoadNode mNode;
  boolean isPolyline, isOverviewPolyline, isLeg, isStep, isDuration, isDistance, isBB;
  int mValue;
  double mLat, mLng;
  double mNorth, mWest, mSouth, mEast;
  private StringBuilder mStringBuilder = new StringBuilder(1024);
  
  public GoogleDirectionsHandler() {
    isOverviewPolyline = isBB = isPolyline = isLeg = isStep = isDuration = isDistance = false;
    mRoad = new Road();
  }

  public void startElement(String uri, String localName, String name,
      Attributes attributes) throws SAXException {
    if (localName.equals("polyline")) {
      isPolyline = true;
    } else if (localName.equals("overview_polyline")) {
      isOverviewPolyline = true;
    } else if (localName.equals("leg")) {
      mLeg = new RoadLeg();
      isLeg = true;
    } else if (localName.equals("step")) {
      mNode = new RoadNode();
      isStep = true;
    } else if (localName.equals("duration")) {
      isDuration = true;
    } else if (localName.equals("distance")) {
      isDistance = true;
    } else if (localName.equals("bounds")) {
      isBB = true;
    }
    mStringBuilder.setLength(0);
  }

  /**
   * Overrides org.xml.sax.helpers.DefaultHandler#characters(char[], int, int)
   */
  public @Override void characters(char[] ch, int start, int length)
      throws SAXException {
    mStringBuilder.append(ch, start, length);
  }
  
  public void endElement(String uri, String localName, String name)
      throws SAXException {
    if (localName.equals("points")) {
      if (isPolyline) {
        //detailed piece of road for the step, to add:
        ArrayList<GeoPoint> polyLine = PolylineEncoder.decode(mStringBuilder.toString(), 10);
        mRoad.mRouteHigh.addAll(polyLine);
      } else if (isOverviewPolyline){
        //low-def polyline for the whole road:
        mRoad.setRouteLow(PolylineEncoder.decode(mStringBuilder.toString(), 10));
      }
    } else if (localName.equals("polyline")) {
      isPolyline = false;
    } else if (localName.equals("overview_polyline")) {
      isOverviewPolyline = false;
    } else if (localName.equals("value")) {
      mValue = Integer.parseInt(mStringBuilder.toString());
    } else if (localName.equals("duration")) {
      if (isStep)
        mNode.mDuration = mValue;
      else
        mLeg.mDuration = mValue;
      isDuration = false;
    } else if (localName.equals("distance")) {
      if (isStep)
        mNode.mLength = mValue/1000.0;
      else
        mLeg.mLength = mValue/1000.0;
      isDistance = false;
    } else if (localName.equals("html_instructions")) {
      if (isStep){
        String value = mStringBuilder.toString();
        //value = value.replaceAll("<[^>]*>", " "); //remove everything in <...>
        //value = value.replaceAll("&nbsp;", " ");
        mNode.mInstructions = value;
        //Log.d(BonusPackHelper.LOG_TAG, mString);
      }
    } else if (localName.equals("start_location")) {
      if (isStep)
        mNode.mLocation = new GeoPoint(mLat, mLng);
    } else if (localName.equals("step")) {
      mRoad.mNodes.add(mNode);
      isStep = false;
    } else if (localName.equals("leg")) {
      mRoad.mLegs.add(mLeg);
      isLeg = false;
    } else if (localName.equals("lat")) {
        mLat = Double.parseDouble(mStringBuilder.toString());
    } else if (localName.equals("lng")) {
        mLng = Double.parseDouble(mStringBuilder.toString());
    } else if (localName.equals("northeast")){
      if (isBB){
        mNorth = mLat;
        mEast = mLng;
      }
    } else if (localName.equals("southwest")){
      if (isBB){
        mSouth = mLat;
        mWest = mLng;
      }
    } else if (localName.equals("bounds")){
      mRoad.mBoundingBox = new BoundingBoxE6(mNorth, mEast, mSouth, mWest);
      isBB = false;
    }
  }
  
}
Java Source Code List
