Come disegnare un tracciato su una mappa usando il file kml?

Question

È possibile analizzare il file kml per visualizzare percorsi o punti in Android? Per favore, potresti aiutarmi con quello?

Questo è codice di esempio kml che vorrei visualizzare in Android mappa di google:

<?xml version="1.0" encoding="UTF-8"?> 
<kml xmlns="http://www.opengis.net/kml/2.2"> 
<Document> 
<name>Paths</name> 
<description>Examples of paths. Note that the tessellate tag is by default 
    set to 0. If you want to create tessellated lines, they must be authored 
    (or edited) directly in KML.</description> 
<Style id="yellowLineGreenPoly"> 
    <LineStyle> 
    <color>7f00ffff</color> 
    <width>4</width> 
    </LineStyle> 
    <PolyStyle> 
    <color>7f00ff00</color> 
    </PolyStyle> 
</Style> 
<Placemark> 
    <name>Absolute Extruded</name> 
    <description>Transparent green wall with yellow outlines</description> 
    <styleUrl>#yellowLineGreenPoly</styleUrl> 
    <LineString> 
    <extrude>1</extrude> 
    <tessellate>1</tessellate> 
    <altitudeMode>absolute</altitudeMode> 
    <coordinates> -112.2550785337791,36.07954952145647,2357 
     -112.2549277039738,36.08117083492122,2357 
     -112.2552505069063,36.08260761307279,2357 
     -112.2564540158376,36.08395660588506,2357 
     -112.2580238976449,36.08511401044813,2357 
     -112.2595218489022,36.08584355239394,2357 
     -112.2608216347552,36.08612634548589,2357 
     -112.262073428656,36.08626019085147,2357 
     -112.2633204928495,36.08621519860091,2357 
     -112.2644963846444,36.08627897945274,2357 
     -112.2656969554589,36.08649599090644,2357 
    </coordinates> 
    <LineString> 
    </Placemark> 
    </Document> 
    </kml> 

Quando sto caricando questo file standard di mappa Web di Google viene visualizzato piacevolmente, ma quando sto cercando il stessa cosa con Android google map non lo fa. Mi porta in alcuni posti e basta. Stavo pensando di cambiare la classe dell'ascoltatore. Attualmente sembra che:

private class MyLocationListener implements LocationListener 
{ 
    @Override 
    public void onLocationChanged(Location loc) { 
     if (loc != null) { 
      latitude = (loc.getLatitude() * 1E6); 
      longitude = (loc.getLongitude() * 1E6); 
      Toast.makeText(getBaseContext(), 
        "Location changed : Lat: " + latitude + 
        " Lng: " + longitude, 
        Toast.LENGTH_SHORT).show(); 

      GeoPoint p = new GeoPoint(
        (int) (loc.getLatitude() * 1E6), 
        (int) (loc.getLongitude() * 1E6)); 

      mc.animateTo(p); 
      mapView.invalidate(); 
      } 
    } 

//--------------------------------------------------------------- 
    @Override 
    public void onProviderDisabled(String provider) { 
     // TODO Auto-generated method stub 
    } 

    @Override 
    public void onProviderEnabled(String provider) { 
     // TODO Auto-generated method stub 
    } 

    @Override 
    public void onStatusChanged(String provider, int status, 
     Bundle extras) { 
     //TODO Auto-generated method stub 
    } 

Per favore qualcuno può dirmi cosa sto facendo male qui?

Answer 1

Nel codice sopra riportato, non si passano i dati kml alla mappa in qualsiasi punto del codice, per quanto posso vedere. Per visualizzare il percorso, è necessario analizzare i dati kml tramite il parser SAX, quindi visualizzare gli indicatori di percorso sulla mappa.

Vedere il codice qui sotto per un esempio, ma non è completo però - solo per te come riferimento e avere un'idea.

Questo è un bean semplice che uso per contenere le informazioni del percorso che analizzerò.

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() + "\n\n"; 
    } 
    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; 
} 

} 

E il SAX Handler di analizzare il 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 
} 

/** Gets be called on opening tags like: 
    * <tag> 
    * Can provide attribute(s), when xml was like: 
    * <tag attribute="attributeValue">*/ 
@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;       
     } 
} 

/** Gets be called on closing tags like: 
    * </tag> */ 
@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; 
     } 
} 

/** Gets be called on the following structure: 
    * <tag>characters</tag> */ 
@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); 
    } 
} 
} 

e un semplice chicco di segnaposto:

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; 
} 

} 

Infine la classe di servizio nel mio modello che chiama il calcolo:

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; 
} 

/** 
* Retrieve navigation data set from either remote URL or String 
* @param url 
* @return navigation set 
*/ 
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(); 

     /* Get a SAXParser from the SAXPArserFactory. */ 
     SAXParserFactory spf = SAXParserFactory.newInstance(); 
     SAXParser sp = spf.newSAXParser(); 

     /* Get the XMLReader of the SAXParser we created. */ 
     XMLReader xr = sp.getXMLReader(); 

     /* Create a new ContentHandler and apply it to the XML-Reader*/ 
     NavigationSaxHandler navSax2Handler = new NavigationSaxHandler(); 
     xr.setContentHandler(navSax2Handler); 

     /* Parse the xml-data from our URL. */ 
     xr.parse(new InputSource(aUrl.openStream())); 

     /* Our NavigationSaxHandler now provides the parsed data to us. */ 
     navigationDataSet = navSax2Handler.getParsedData(); 

     /* Set the result to be displayed in our GUI. */ 
     Log.d(myapp.APP,"navigationDataSet: "+navigationDataSet.toString()); 

    } catch (Exception e) { 
     // Log.e(myapp.APP, "error with kml xml", e); 
     navigationDataSet = null; 
    } 

    return navigationDataSet; 
} 

} 

Disegno:

/** 
* Does the actual drawing of the route, based on the geo points provided in the nav set 
* 
* @param navSet  Navigation set bean that holds the route information, incl. geo pos 
* @param color  Color in which to draw the lines 
* @param mMapView01 Map view to draw onto 
*/ 
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); 
} 

Questa è la classe RouteOverlay:

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; 
} 

@Override 
public 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); 
     } 
     /* mode=3：end */ 
     else if(mode==3) { 
      /* the last path */ 

      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); 
      /* end point */ 
      paint.setAlpha(255); 
      canvas.drawOval(oval, paint); 
     } 
    } 
    return super.draw(canvas, mapView, shadow, when); 
} 

} 

Answer 2

Grazie Mathias Lin, testato e funziona!

Inoltre, l'implementazione di esempio del metodo di Mathias nell'attività può essere la seguente.

public class DirectionMapActivity extends MapActivity { 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.directionmap); 

     MapView mapView = (MapView) findViewById(R.id.mapview); 
     mapView.setBuiltInZoomControls(true); 

     // Acquire a reference to the system Location Manager 
     LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE); 

     String locationProvider = LocationManager.NETWORK_PROVIDER; 
     Location lastKnownLocation = locationManager.getLastKnownLocation(locationProvider); 

     StringBuilder urlString = new StringBuilder(); 
     urlString.append("http://maps.google.com/maps?f=d&hl=en"); 
     urlString.append("&saddr=");//from 
     urlString.append(Double.toString(lastKnownLocation.getLatitude())); 
     urlString.append(","); 
     urlString.append(Double.toString(lastKnownLocation.getLongitude())); 
     urlString.append("&daddr=");//to 
     urlString.append(Double.toString((double)dest[0]/1.0E6)); 
     urlString.append(","); 
     urlString.append(Double.toString((double)dest[1]/1.0E6)); 
     urlString.append("&ie=UTF8&0&om=0&output=kml"); 

     try{ 
      // setup the url 
      URL url = new URL(urlString.toString()); 
      // create the factory 
      SAXParserFactory factory = SAXParserFactory.newInstance(); 
      // create a parser 
      SAXParser parser = factory.newSAXParser(); 
      // create the reader (scanner) 
      XMLReader xmlreader = parser.getXMLReader(); 
      // instantiate our handler 
      NavigationSaxHandler navSaxHandler = new NavigationSaxHandler(); 
      // assign our handler 
      xmlreader.setContentHandler(navSaxHandler); 
      // get our data via the url class 
      InputSource is = new InputSource(url.openStream()); 
      // perform the synchronous parse   
      xmlreader.parse(is); 
      // get the results - should be a fully populated RSSFeed instance, or null on error 
      NavigationDataSet ds = navSaxHandler.getParsedData(); 

      // draw path 
      drawPath(ds, Color.parseColor("#add331"), mapView); 

      // find boundary by using itemized overlay 
      GeoPoint destPoint = new GeoPoint(dest[0],dest[1]); 
      GeoPoint currentPoint = new GeoPoint(new Double(lastKnownLocation.getLatitude()*1E6).intValue() 
               ,new Double(lastKnownLocation.getLongitude()*1E6).intValue()); 

      Drawable dot = this.getResources().getDrawable(R.drawable.pixel); 
      MapItemizedOverlay bgItemizedOverlay = new MapItemizedOverlay(dot,this); 
      OverlayItem currentPixel = new OverlayItem(destPoint, null, null); 
      OverlayItem destPixel = new OverlayItem(currentPoint, null, null); 
      bgItemizedOverlay.addOverlay(currentPixel); 
      bgItemizedOverlay.addOverlay(destPixel); 

      // center and zoom in the map 
      MapController mc = mapView.getController(); 
      mc.zoomToSpan(bgItemizedOverlay.getLatSpanE6()*2,bgItemizedOverlay.getLonSpanE6()*2); 
      mc.animateTo(new GeoPoint(
        (currentPoint.getLatitudeE6() + destPoint.getLatitudeE6())/2 
        , (currentPoint.getLongitudeE6() + destPoint.getLongitudeE6())/2)); 

     } catch(Exception e) { 
      Log.d("DirectionMap","Exception parsing kml."); 
     } 

    } 
    // and the rest of the methods in activity, e.g. drawPath() etc... 

MapItemizedOverlay.java

public class MapItemizedOverlay extends ItemizedOverlay{ 
    private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>(); 
    private Context mContext; 

    public MapItemizedOverlay(Drawable defaultMarker, Context context) { 
      super(boundCenterBottom(defaultMarker)); 
      mContext = context; 
    } 

    public void addOverlay(OverlayItem overlay) { 
     mOverlays.add(overlay); 
     populate(); 
    } 

    @Override 
    protected OverlayItem createItem(int i) { 
     return mOverlays.get(i); 
    } 

    @Override 
    public int size() { 
     return mOverlays.size(); 
    } 

} 

Answer 3

codice Mathias Lin lavorando splendidamente. Tuttavia, si potrebbe prendere in considerazione la modifica di questa parte interna metodo drawPath:

if (lngLat.length >= 2 && gp1.getLatitudeE6() > 0 && gp1.getLongitudeE6() > 0 
        && gp2.getLatitudeE6() > 0 && gp2.getLongitudeE6() > 0) { 

GeoPoint può essere minore di zero, così, posso passare la mia a:

 if (lngLat.length >= 2 && gp1.getLatitudeE6() != 0 && gp1.getLongitudeE6() != 0 
        && gp2.getLatitudeE6() != 0 && gp2.getLongitudeE6() != 0) { 

Grazie: D

Answer 4

Ora è disponibile una versione beta di Google Maps KML Importing Utility.

Fa parte di Google Maps Android API Utility Library. Come documentato permette di caricare file KML da flussi

KmlLayer layer = new KmlLayer(getMap(), kmlInputStream, getApplicationContext()); 

o risorse locali

KmlLayer layer = new KmlLayer(getMap(), R.raw.kmlFile, getApplicationContext()); 

Dopo aver creato un KmlLayer, chiamare addLayerToMap() per aggiungere i dati importati sulla mappa.

layer.addLayerToMap();