How to display route between two points (geopoints) on Google Maps in Android

How to display route between two points (geopoints) on Google Maps in Android


Recently a have some task in my Android project.
I needed to show route (directions) between two points (geopoins)on google maps in Android.
I thought it can be simple task. But It was a lot of interesting things :).
I’ve discovered a lot of topics of this problem.
I find one usefull. This is IT
But, it didn’t works for me.
Here I want to show my changes of this project.

RoadProvider.java
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import java.io.InputStream;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;

public class RoadProvider {
 private static Document xmlDocument;

 public static Road getRoute(InputStream is) {
  Road mRoad = new Road();
  String expression = "string(//Placemark/GeometryCollection/LineString/coordinates)";
  String expression2 = "string(//Placemark[contains(name, 'Route')]/description)";
  try {
   xmlDocument = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(is);
   XPathFactory xPathFactory = XPathFactory.newInstance();
   XPath xPath = xPathFactory.newXPath();
   XPathExpression xPathExpression = xPath.compile(expression);
   String result = xPathExpression.evaluate(xmlDocument);
   String[] arr1 = result.split(" ");
   for (String str : arr1) {
    String[] coords = str.split(",");
    if (coords.length == 3) {
     double[] xy = new double[] {};
     double x = Double.parseDouble(coords[0]);
     double y = Double.parseDouble(coords[1]);

     xy = addDouble(xy, x);
     xy = addDouble(xy, y);
     mRoad.mRoute = addDouble(mRoad.mRoute, xy);
     System.out.println("PARSING ..... ");
    }
   }

   xPathExpression = xPath.compile(expression2);
   String description = xPathExpression.evaluate(xmlDocument);

   mRoad.mDescription = cleanup(description);

   System.out.println("DESCRIPTION = " + mRoad.mDescription);

  } catch (Exception ex) {
   ex.printStackTrace();
  }
  return mRoad;
 }

 static double[][] addDouble(double[][] array, double[] element) {
  int arrayLength = array.length;
  double[][] result = new double[arrayLength + 1][];
  for (int i = 0; i < arrayLength; i++) {
   int elementLength = array[i].length;
   result[i] = new double[elementLength];
   for (int j = 0; j < elementLength; j++)
    result[i][j] = array[i][j];
  }
  int newElementLength = element.length;
  result[arrayLength] = new double[newElementLength];
  for (int j = 0; j < newElementLength; j++)
   result[arrayLength][j] = element[j];
  return result;
 }

 static double[] addDouble(double[] array, double element) {
  int arrayLength = array.length;
  double[] result = new double[arrayLength + 1];
  for (int i = 0; i < arrayLength; i++)
   result[i] = array[i];
  result[arrayLength] = element;
  return result;
 }

 public static String getUrl(double fromLat, double fromLon, double toLat, double toLon) {
  StringBuffer urlString = new StringBuffer();
  urlString.append("http://maps.google.com/maps?f=d&amp;hl=en");
  urlString.append("&amp;saddr=");
  urlString.append(Double.toString(fromLat));
  urlString.append(",");
  urlString.append(Double.toString(fromLon));
  urlString.append("&amp;daddr=");
  urlString.append(Double.toString(toLat));
  urlString.append(",");
  urlString.append(Double.toString(toLon));
  urlString.append("&amp;ie=UTF8&amp;0&amp;om=0&amp;output=kml");
  return urlString.toString();
 }

 private static String cleanup(String value) {
  String remove = "<br/>";
  int index = value.indexOf(remove);
  if (index != -1)
   value = value.substring(0, index);
  remove = "&amp;#160;";
  index = value.indexOf(remove);
  int len = remove.length();
  while (index != -1) {
   value = value.substring(0, index).concat(value.substring(index + len, value.length()));
   index = value.indexOf(remove);
  }
  return value;
 }
}