在上面的代码中，就我所知，您没有将kml数据传递到代码中的mapView。要显示路线，您应该通过SAX解析器解析kml数据，然后在地图上显示路线标记。
请参阅下面的代码作为示例，但是它还不完整-仅作为您的参考并获得一些想法。
这是一个简单的bean，用于保存将要解析的路由信息。
package com.myapp.android.model.navigation;import java.util.ArrayList;import java.util.Iterator;public class NavigationDataSet { private ArrayList<Placemark> placemarks = new ArrayList<Placemark>();private Placemark currentPlacemark;private Placemark routePlacemark;public String toString() { String s= ""; for (Iterator<Placemark> iter=placemarks.iterator();iter.hasNext();) { Placemark p = (Placemark)iter.next(); s += p.getTitle() + "n" + p.getDescription() + "nn"; } return s;}public void addCurrentPlacemark() { placemarks.add(currentPlacemark);}public ArrayList<Placemark> getPlacemarks() { return placemarks;}public void setPlacemarks(ArrayList<Placemark> placemarks) { this.placemarks = placemarks;}public Placemark getCurrentPlacemark() { return currentPlacemark;}public void setCurrentPlacemark(Placemark currentPlacemark) { this.currentPlacemark = currentPlacemark;}public Placemark getRoutePlacemark() { return routePlacemark;}public void setRoutePlacemark(Placemark routePlacemark) { this.routePlacemark = routePlacemark;}}然后使用SAX Handler解析kml：
package com.myapp.android.model.navigation;import android.util.Log;import com.myapp.android.myapp;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;import com.myapp.android.model.navigation.NavigationDataSet;import com.myapp.android.model.navigation.Placemark;public class NavigationSaxHandler extends DefaultHandler{ // =========================================================== // Fields // =========================================================== private boolean in_kmltag = false; private boolean in_placemarktag = false; private boolean in_nametag = false; private boolean in_descriptiontag = false; private boolean in_geometrycollectiontag = false; private boolean in_linestringtag = false; private boolean in_pointtag = false; private boolean in_coordinatestag = false; private StringBuffer buffer; private NavigationDataSet navigationDataSet = new NavigationDataSet(); // =========================================================== // Getter & Setter // =========================================================== public NavigationDataSet getParsedData() { navigationDataSet.getCurrentPlacemark().setCoordinates(buffer.toString().trim()); return this.navigationDataSet; } // =========================================================== // Methods // =========================================================== @Override public void startdocument() throws SAXException { this.navigationDataSet = new NavigationDataSet(); } @Override public void enddocument() throws SAXException { // Nothing to do } @Override public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException { if (localName.equals("kml")) { this.in_kmltag = true; } else if (localName.equals("Placemark")) { this.in_placemarktag = true; navigationDataSet.setCurrentPlacemark(new Placemark()); } else if (localName.equals("name")) { this.in_nametag = true; } else if (localName.equals("description")) {this.in_descriptiontag = true; } else if (localName.equals("GeometryCollection")) {this.in_geometrycollectiontag = true; } else if (localName.equals("LineString")) {this.in_linestringtag = true; } else if (localName.equals("point")) {this.in_pointtag = true; } else if (localName.equals("coordinates")) { buffer = new StringBuffer(); this.in_coordinatestag = true; } } @Override public void endElement(String namespaceURI, String localName, String qName) throws SAXException { if (localName.equals("kml")) {this.in_kmltag = false; } else if (localName.equals("Placemark")) { this.in_placemarktag = false; if ("Route".equals(navigationDataSet.getCurrentPlacemark().getTitle())) navigationDataSet.setRoutePlacemark(navigationDataSet.getCurrentPlacemark()); else navigationDataSet.addCurrentPlacemark(); } else if (localName.equals("name")) { this.in_nametag = false; } else if (localName.equals("description")) { this.in_descriptiontag = false; } else if (localName.equals("GeometryCollection")) { this.in_geometrycollectiontag = false; } else if (localName.equals("LineString")) { this.in_linestringtag = false; } else if (localName.equals("point")) { this.in_pointtag = false; } else if (localName.equals("coordinates")) { this.in_coordinatestag = false; } } @Override public void characters(char ch[], int start, int length) { if(this.in_nametag){ if (navigationDataSet.getCurrentPlacemark()==null) navigationDataSet.setCurrentPlacemark(new Placemark()); navigationDataSet.getCurrentPlacemark().setTitle(new String(ch, start, length)); } else if(this.in_descriptiontag){ if (navigationDataSet.getCurrentPlacemark()==null) navigationDataSet.setCurrentPlacemark(new Placemark()); navigationDataSet.getCurrentPlacemark().setDescription(new String(ch, start, length)); } else if(this.in_coordinatestag){ if (navigationDataSet.getCurrentPlacemark()==null) navigationDataSet.setCurrentPlacemark(new Placemark()); //navigationDataSet.getCurrentPlacemark().setCoordinates(new String(ch, start, length)); buffer.append(ch, start, length); }} }和一个简单的placeMark bean：
package com.myapp.android.model.navigation;public class Placemark {String title;String description;String coordinates;String address;public String getTitle() { return title;}public void setTitle(String title) { this.title = title;}public String getDescription() { return description;}public void setDescription(String description) { this.description = description;}public String getCoordinates() { return coordinates;}public void setCoordinates(String coordinates) { this.coordinates = coordinates;}public String getAddress() { return address;}public void setAddress(String address) { this.address = address;}}最后，模型中的服务类调用计算：
package com.myapp.android.model.navigation;import java.io.IOException;import java.io.InputStream;import java.net.URL;import java.net.URLConnection;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;import com.myapp.android.myapp;import org.xml.sax.InputSource;import org.xml.sax.XMLReader;import android.util.Log;public class MapService {public static final int MODE_ANY = 0;public static final int MODE_CAR = 1;public static final int MODE_WALKING = 2;public static String inputStreamToString (InputStream in) throws IOException { StringBuffer out = new StringBuffer(); byte[] b = new byte[4096]; for (int n; (n = in.read(b)) != -1;) { out.append(new String(b, 0, n)); } return out.toString();}public static NavigationDataSet calculateRoute(Double startLat, Double startLng, Double targetLat, Double targetLng, int mode) { return calculateRoute(startLat + "," + startLng, targetLat + "," + targetLng, mode);}public static NavigationDataSet calculateRoute(String startCoords, String targetCoords, int mode) { String urlPedestrianMode = "http://maps.google.com/maps?" + "saddr=" + startCoords + "&daddr=" + targetCoords + "&sll=" + startCoords + "&dirflg=w&hl=en&ie=UTF8&z=14&output=kml"; Log.d(myapp.APP, "urlPedestrianMode: "+urlPedestrianMode); String urlCarMode = "http://maps.google.com/maps?" + "saddr=" + startCoords + "&daddr=" + targetCoords + "&sll=" + startCoords + "&hl=en&ie=UTF8&z=14&output=kml"; Log.d(myapp.APP, "urlCarMode: "+urlCarMode); NavigationDataSet navSet = null; // for mode_any: try pedestrian route calculation first, if it fails, fall back to car route if (mode==MODE_ANY||mode==MODE_WALKING) navSet = MapService.getNavigationDataSet(urlPedestrianMode); if (mode==MODE_ANY&&navSet==null||mode==MODE_CAR) navSet = MapService.getNavigationDataSet(urlCarMode); return navSet;}public static NavigationDataSet getNavigationDataSet(String url) { // urlString = "http://192.168.1.100:80/test.kml"; Log.d(myapp.APP,"urlString -->> " + url); NavigationDataSet navigationDataSet = null; try { final URL aUrl = new URL(url); final URLConnection conn = aUrl.openConnection(); conn.setReadTimeout(15 * 1000); // timeout for reading the google maps data: 15 secs conn.connect(); SAXParserFactory spf = SAXParserFactory.newInstance(); SAXParser sp = spf.newSAXParser(); XMLReader xr = sp.getXMLReader(); NavigationSaxHandler navSax2Handler = new NavigationSaxHandler(); xr.setContentHandler(navSax2Handler); xr.parse(new InputSource(aUrl.openStream())); navigationDataSet = navSax2Handler.getParsedData(); Log.d(myapp.APP,"navigationDataSet: "+navigationDataSet.toString()); } catch (Exception e) { // Log.e(myapp.APP, "error with kml xml", e); navigationDataSet = null; } return navigationDataSet;}}画画：
public void drawPath(NavigationDataSet navSet, int color, MapView mMapView01) { Log.d(myapp.APP, "map color before: " + color); // color correction for dining, make it darker if (color == Color.parseColor("#add331")) color = Color.parseColor("#6C8715"); Log.d(myapp.APP, "map color after: " + color); Collection overlaysToAddAgain = new ArrayList(); for (Iterator iter = mMapView01.getOverlays().iterator(); iter.hasNext();) { Object o = iter.next(); Log.d(myapp.APP, "overlay type: " + o.getClass().getName()); if (!RouteOverlay.class.getName().equals(o.getClass().getName())) { // mMapView01.getOverlays().remove(o); overlaysToAddAgain.add(o); } } mMapView01.getOverlays().clear(); mMapView01.getOverlays().addAll(overlaysToAddAgain); String path = navSet.getRoutePlacemark().getCoordinates(); Log.d(myapp.APP, "path=" + path); if (path != null && path.trim().length() > 0) { String[] pairs = path.trim().split(" "); Log.d(myapp.APP, "pairs.length=" + pairs.length); String[] lngLat = pairs[0].split(","); // lngLat[0]=longitude lngLat[1]=latitude lngLat[2]=height Log.d(myapp.APP, "lnglat =" + lngLat + ", length: " + lngLat.length); if (lngLat.length<3) lngLat = pairs[1].split(","); // if first pair is not transferred completely, take seconds pair //TODO try { GeoPoint startGP = new GeoPoint((int) (Double.parseDouble(lngLat[1]) * 1E6), (int) (Double.parseDouble(lngLat[0]) * 1E6)); mMapView01.getOverlays().add(new RouteOverlay(startGP, startGP, 1)); GeoPoint gp1; GeoPoint gp2 = startGP; for (int i = 1; i < pairs.length; i++) // the last one would be crash { lngLat = pairs[i].split(","); gp1 = gp2; if (lngLat.length >= 2 && gp1.getLatitudeE6() > 0 && gp1.getLongitudeE6() > 0 && gp2.getLatitudeE6() > 0 && gp2.getLongitudeE6() > 0) { // for GeoPoint, first:latitude, second:longitude gp2 = new GeoPoint((int) (Double.parseDouble(lngLat[1]) * 1E6), (int) (Double.parseDouble(lngLat[0]) * 1E6)); if (gp2.getLatitudeE6() != 22200000) { mMapView01.getOverlays().add(new RouteOverlay(gp1, gp2, 2, color)); Log.d(myapp.APP, "draw:" + gp1.getLatitudeE6() + "/" + gp1.getLongitudeE6() + " TO " + gp2.getLatitudeE6() + "/" + gp2.getLongitudeE6()); } } // Log.d(myapp.APP,"pair:" + pairs[i]); } //routeOverlays.add(new RouteOverlay(gp2,gp2, 3)); mMapView01.getOverlays().add(new RouteOverlay(gp2, gp2, 3)); } catch (NumberFormatException e) { Log.e(myapp.APP, "Cannot draw route.", e); } } // mMapView01.getOverlays().addAll(routeOverlays); // use the default color mMapView01.setEnabled(true);}这是RouteOverlay类：
package com.myapp.android.activity.map.nav;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Point;import android.graphics.RectF;import com.google.android.maps.GeoPoint;import com.google.android.maps.MapView;import com.google.android.maps.Overlay;import com.google.android.maps.Projection;public class RouteOverlay extends Overlay { private GeoPoint gp1;private GeoPoint gp2;private int mRadius=6;private int mode=0;private int defaultColor;private String text="";private Bitmap img = null;public RouteOverlay(GeoPoint gp1,GeoPoint gp2,int mode) { // GeoPoint is a int. (6E) this.gp1 = gp1; this.gp2 = gp2; this.mode = mode; defaultColor = 999; // no defaultColor}public RouteOverlay(GeoPoint gp1,GeoPoint gp2,int mode, int defaultColor) { this.gp1 = gp1; this.gp2 = gp2; this.mode = mode; this.defaultColor = defaultColor;}public void setText(String t) { this.text = t;}public void setBitmap(Bitmap bitmap) { this.img = bitmap;}public int getMode() { return mode;}@Overridepublic boolean draw (Canvas canvas, MapView mapView, boolean shadow, long when) { Projection projection = mapView.getProjection(); if (shadow == false) { Paint paint = new Paint(); paint.setAntiAlias(true); Point point = new Point(); projection.toPixels(gp1, point); // mode=1：start if(mode==1) { if(defaultColor==999) paint.setColor(Color.BLACK); // Color.BLUE else paint.setColor(defaultColor); RectF oval=new RectF(point.x - mRadius, point.y - mRadius, point.x + mRadius, point.y + mRadius); // start point canvas.drawOval(oval, paint); } // mode=2：path else if(mode==2) { if(defaultColor==999) paint.setColor(Color.RED); else paint.setColor(defaultColor); Point point2 = new Point(); projection.toPixels(gp2, point2); paint.setStrokeWidth(5); paint.setAlpha(defaultColor==Color.parseColor("#6C8715")?220:120); canvas.drawLine(point.x, point.y, point2.x,point2.y, paint); } else if(mode==3) { if(defaultColor==999) paint.setColor(Color.BLACK); // Color.GREEN else paint.setColor(defaultColor); Point point2 = new Point(); projection.toPixels(gp2, point2); paint.setStrokeWidth(5); paint.setAlpha(defaultColor==Color.parseColor("#6C8715")?220:120); canvas.drawLine(point.x, point.y, point2.x,point2.y, paint); RectF oval=new RectF(point2.x - mRadius,point2.y - mRadius, point2.x + mRadius,point2.y + mRadius); paint.setAlpha(255); canvas.drawOval(oval, paint); } } return super.draw(canvas, mapView, shadow, when);}}
