我已经用谷歌搜索了 2-3 天，但我无法为我的问题找到完美的解决方案。
我需要显示两个地理点之间的路线（不是直线，但需要显示行驶方向的路线） 但我无法找到任何解决方案。 我在this question 中遇到过解决方案。
但我猜该解决方案也不起作用。如果你能帮助我，那就太好了。
我找到了解决方案 寻找下面的答案...
【问题讨论】：
标签： android routes direction geopoints
我正在使用这个
String url = RoadProvider.getUrl(fromLat, fromLon, toLat, toLon);
InputStream is = getConnection(url);
mRoad = RoadProvider.getRoute(is);
mHandler.sendEmptyMessage(0);
在处理程序中
MapOverlay mapOverlay = new MapOverlay(mRoad, mapView);
List<Overlay> listOfOverlays = mapView.getOverlays();
listOfOverlays.add(mapOverlay);
这里是roadprovider.java
package com.singPost;
import java.io.IOException;
import java.io.InputStream;
import java.util.Stack;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class RoadProvider
{
public static Road getRoute(InputStream is)
{
KMLHandler handler = new KMLHandler();
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;
}
public static String getUrl(double fromLat, double fromLon, double toLat, double toLon)
{
// connect to map web service
StringBuffer urlString = new StringBuffer();
urlString.append("http://maps.google.com/maps?f=d&hl=en");
urlString.append("&saddr=");// from
urlString.append(Double.toString(fromLat));
urlString.append(",");
urlString.append(Double.toString(fromLon));
urlString.append("&daddr=");// to
urlString.append(Double.toString(toLat));
urlString.append(",");
urlString.append(Double.toString(toLon));
urlString.append("&ie=UTF8&0&om=0&output=kml");
return urlString.toString();
}
}
class KMLHandler extends DefaultHandler {
Road mRoad;
boolean isPlacemark;
boolean isRoute;
boolean isItemIcon;
private Stack mCurrentElement = new Stack();
private String mString;
public KMLHandler() {
mRoad = new Road();
}
public void startElement(String uri, String localName, String name,
Attributes attributes) throws SAXException {
mCurrentElement.push(localName);
if (localName.equalsIgnoreCase("Placemark")) {
isPlacemark = true;
mRoad.mPoints = addPoint(mRoad.mPoints);
} else if (localName.equalsIgnoreCase("ItemIcon")) {
if (isPlacemark)
isItemIcon = true;
}
mString = new String();
}
public void characters(char[] ch, int start, int length)
throws SAXException {
String chars = new String(ch, start, length).trim();
mString = mString.concat(chars);
}
public void endElement(String uri, String localName, String name)
throws SAXException {
if (mString.length() > 0) {
if (localName.equalsIgnoreCase("name")) {
if (isPlacemark) {
isRoute = mString.equalsIgnoreCase("Route");
if (!isRoute) {
mRoad.mPoints[mRoad.mPoints.length - 1].mName = mString;
}
} else {
mRoad.mName = mString;
}
} else if (localName.equalsIgnoreCase("color") && !isPlacemark) {
mRoad.mColor = Integer.parseInt(mString, 16);
} else if (localName.equalsIgnoreCase("width") && !isPlacemark) {
mRoad.mWidth = Integer.parseInt(mString);
} else if (localName.equalsIgnoreCase("description")) {
if (isPlacemark) {
String description = cleanup(mString);
if (!isRoute)
mRoad.mPoints[mRoad.mPoints.length - 1].mDescription = description;
else
mRoad.mDescription = description;
}
} else if (localName.equalsIgnoreCase("href")) {
if (isItemIcon) {
mRoad.mPoints[mRoad.mPoints.length - 1].mIconUrl = mString;
}
} else if (localName.equalsIgnoreCase("coordinates")) {
if (isPlacemark) {
if (!isRoute) {
String[] xyParsed = split(mString, ",");
double lon = Double.parseDouble(xyParsed[0]);
double lat = Double.parseDouble(xyParsed[1]);
mRoad.mPoints[mRoad.mPoints.length - 1].mLatitude = lat;
mRoad.mPoints[mRoad.mPoints.length - 1].mLongitude = lon;
} else {
String[] coodrinatesParsed = split(mString, " ");
int lenNew = coodrinatesParsed.length;
int lenOld = mRoad.mRoute.length;
double[][] temp = new double[lenOld + lenNew][2];
for (int i = 0; i < lenOld; i++) {
temp[i] = mRoad.mRoute[i];
}
for (int i = 0; i < lenNew; i++) {
String[] xyParsed = split(coodrinatesParsed[i], ",");
for (int j = 0; j < 2 && j < xyParsed.length; j++)
temp[lenOld + i][j] = Double
.parseDouble(xyParsed[j]);
}
mRoad.mRoute = temp;
}
}
}
}
mCurrentElement.pop();
if (localName.equalsIgnoreCase("Placemark")) {
isPlacemark = false;
if (isRoute)
isRoute = false;
} else if (localName.equalsIgnoreCase("ItemIcon")) {
if (isItemIcon)
isItemIcon = false;
}
}
private String cleanup(String value) {
String remove = "<br/>";
int index = value.indexOf(remove);
if (index != -1)
value = value.substring(0, index);
remove = " ";
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;
}
public Point2[] addPoint(Point2[] points)
{
Point2[] result = new Point2[points.length + 1];
for (int i = 0; i < points.length; i++)
result[i] = points[i];
result[points.length] = new Point2();
return result;
}
private static String[] split(String strString, String strDelimiter)
{
String[] strArray;
int iOccurrences = 0;
int iIndexOfInnerString = 0;
int iIndexOfDelimiter = 0;
int iCounter = 0;
if (strString == null)
{
throw new IllegalArgumentException("Input string cannot be null.");
}
if (strDelimiter.length() <= 0 || strDelimiter == null)
{
throw new IllegalArgumentException("Delimeter cannot be null or empty.");
}
if (strString.startsWith(strDelimiter))
{
strString = strString.substring(strDelimiter.length());
}
if (!strString.endsWith(strDelimiter))
{
strString += strDelimiter;
}
while ((iIndexOfDelimiter = strString.indexOf(strDelimiter,
iIndexOfInnerString)) != -1)
{
iOccurrences += 1;
iIndexOfInnerString = iIndexOfDelimiter + strDelimiter.length();
}
strArray = new String[iOccurrences];
iIndexOfInnerString = 0;
iIndexOfDelimiter = 0;
while ((iIndexOfDelimiter = strString.indexOf(strDelimiter,
iIndexOfInnerString)) != -1)
{
strArray[iCounter] = strString.substring(iIndexOfInnerString,
iIndexOfDelimiter);
iIndexOfInnerString = iIndexOfDelimiter + strDelimiter.length();
iCounter += 1;
}
return strArray;
}
}
【讨论】：
【讨论】：
这对我很有用：
这不是我的代码，我从 stackoverflow 的一个很好的答案中得到它，但我现在找不到这个答案，所以这里是代码：
将此类添加到您的项目中：
package ...;
import java.io.InputStream;
import java.util.ArrayList;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import com.google.android.gms.maps.model.LatLng;
import android.content.Context;
import android.util.Log;
public class GMapV2Direction {
public final static String MODE_DRIVING = "driving";
public final static String MODE_WALKING = "walking";
public GMapV2Direction() {
}
public Document getDocument(LatLng start, LatLng end, String mode) {
String url = "http://maps.googleapis.com/maps/api/directions/xml?"
+ "origin=" + start.latitude + "," + start.longitude
+ "&destination=" + end.latitude + "," + end.longitude
+ "&sensor=false&units=metric&mode=driving";
Log.d("url", url);
try {
HttpClient httpClient = new DefaultHttpClient();
HttpContext localContext = new BasicHttpContext();
HttpPost httpPost = new HttpPost(url);
HttpResponse response = httpClient.execute(httpPost, localContext);
InputStream in = response.getEntity().getContent();
DocumentBuilder builder = DocumentBuilderFactory.newInstance()
.newDocumentBuilder();
Document doc = builder.parse(in);
return doc;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public String getDurationText(Document doc) {
try {
NodeList nl1 = doc.getElementsByTagName("duration");
Node node1 = nl1.item(0);
NodeList nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "text"));
Log.i("DurationText", node2.getTextContent());
return node2.getTextContent();
} catch (Exception e) {
return "0";
}
}
public int getDurationValue(Document doc) {
try {
NodeList nl1 = doc.getElementsByTagName("duration");
Node node1 = nl1.item(0);
NodeList nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "value"));
Log.i("DurationValue", node2.getTextContent());
return Integer.parseInt(node2.getTextContent());
} catch (Exception e) {
return -1;
}
}
public String getDistanceText(Document doc) {
/*
* while (en.hasMoreElements()) { type type = (type) en.nextElement();
*
* }
*/
try {
NodeList nl1;
nl1 = doc.getElementsByTagName("distance");
Node node1 = nl1.item(nl1.getLength() - 1);
NodeList nl2 = null;
nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "value"));
Log.d("DistanceText", node2.getTextContent());
return node2.getTextContent();
} catch (Exception e) {
return "-1";
}
/*
* NodeList nl1; if(doc.getElementsByTagName("distance")!=null){ nl1=
* doc.getElementsByTagName("distance");
*
* Node node1 = nl1.item(nl1.getLength() - 1); NodeList nl2 = null; if
* (node1.getChildNodes() != null) { nl2 = node1.getChildNodes(); Node
* node2 = nl2.item(getNodeIndex(nl2, "value")); Log.d("DistanceText",
* node2.getTextContent()); return node2.getTextContent(); } else return
* "-1";} else return "-1";
*/
}
public int getDistanceValue(Document doc) {
try {
NodeList nl1 = doc.getElementsByTagName("distance");
Node node1 = null;
node1 = nl1.item(nl1.getLength() - 1);
NodeList nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "value"));
Log.i("DistanceValue", node2.getTextContent());
return Integer.parseInt(node2.getTextContent());
} catch (Exception e) {
return -1;
}
/*
* NodeList nl1 = doc.getElementsByTagName("distance"); Node node1 =
* null; if (nl1.getLength() > 0) node1 = nl1.item(nl1.getLength() - 1);
* if (node1 != null) { NodeList nl2 = node1.getChildNodes(); Node node2
* = nl2.item(getNodeIndex(nl2, "value")); Log.i("DistanceValue",
* node2.getTextContent()); return
* Integer.parseInt(node2.getTextContent()); } else return 0;
*/
}
public String getStartAddress(Document doc) {
try {
NodeList nl1 = doc.getElementsByTagName("start_address");
Node node1 = nl1.item(0);
Log.i("StartAddress", node1.getTextContent());
return node1.getTextContent();
} catch (Exception e) {
return "-1";
}
}
public String getEndAddress(Document doc) {
try {
NodeList nl1 = doc.getElementsByTagName("end_address");
Node node1 = nl1.item(0);
Log.i("StartAddress", node1.getTextContent());
return node1.getTextContent();
} catch (Exception e) {
return "-1";
}
}
public String getCopyRights(Document doc) {
try {
NodeList nl1 = doc.getElementsByTagName("copyrights");
Node node1 = nl1.item(0);
Log.i("CopyRights", node1.getTextContent());
return node1.getTextContent();
} catch (Exception e) {
return "-1";
}
}
public ArrayList<LatLng> getDirection(Document doc) {
NodeList nl1, nl2, nl3;
ArrayList<LatLng> listGeopoints = new ArrayList<LatLng>();
nl1 = doc.getElementsByTagName("step");
if (nl1.getLength() > 0) {
for (int i = 0; i < nl1.getLength(); i++) {
Node node1 = nl1.item(i);
nl2 = node1.getChildNodes();
Node locationNode = nl2
.item(getNodeIndex(nl2, "start_location"));
nl3 = locationNode.getChildNodes();
Node latNode = nl3.item(getNodeIndex(nl3, "lat"));
double lat = Double.parseDouble(latNode.getTextContent());
Node lngNode = nl3.item(getNodeIndex(nl3, "lng"));
double lng = Double.parseDouble(lngNode.getTextContent());
listGeopoints.add(new LatLng(lat, lng));
locationNode = nl2.item(getNodeIndex(nl2, "polyline"));
nl3 = locationNode.getChildNodes();
latNode = nl3.item(getNodeIndex(nl3, "points"));
ArrayList<LatLng> arr = decodePoly(latNode.getTextContent());
for (int j = 0; j < arr.size(); j++) {
listGeopoints.add(new LatLng(arr.get(j).latitude, arr
.get(j).longitude));
}
locationNode = nl2.item(getNodeIndex(nl2, "end_location"));
nl3 = locationNode.getChildNodes();
latNode = nl3.item(getNodeIndex(nl3, "lat"));
lat = Double.parseDouble(latNode.getTextContent());
lngNode = nl3.item(getNodeIndex(nl3, "lng"));
lng = Double.parseDouble(lngNode.getTextContent());
listGeopoints.add(new LatLng(lat, lng));
}
}
return listGeopoints;
}
private int getNodeIndex(NodeList nl, String nodename) {
for (int i = 0; i < nl.getLength(); i++) {
if (nl.item(i).getNodeName().equals(nodename))
return i;
}
return -1;
}
private ArrayList<LatLng> decodePoly(String encoded) {
ArrayList<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 position = new LatLng((double) lat / 1E5, (double) lng / 1E5);
poly.add(position);
}
return poly;
}
}
然后根据您的需要使用此类： 例如绘制方向：
md = new GMapV2Direction();
mMap = ((SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map)).getMap();
Document doc = md.getDocument(sourcePosition, destPosition,
GMapV2Direction.MODE_DRIVING);
ArrayList<LatLng> directionPoint = md.getDirection(doc);
PolylineOptions rectLine = new PolylineOptions().width(3).color(
Color.RED);
for (int i = 0; i < directionPoint.size(); i++) {
rectLine.add(directionPoint.get(i));
}
Polyline polylin = mMap.addPolyline(rectLine);
sourcePosition, destPosition 来自 LatLng 类型，你给他们想要的分数。我在这里写了我认为可以帮助的代码部分，欢迎提出任何问题。
【讨论】：