उपरोक्त कोड में, आप अपने कोड में कहीं भी अपने दृश्य में kml डेटा पास नहीं करते, जहाँ तक मैं देख सकता हूँ। मार्ग प्रदर्शित करने के लिए, आपको किमी डेटा को SAX पार्सर के माध्यम से पार्स करना चाहिए, फिर मानचित्र पर मार्ग मार्कर प्रदर्शित करें।
एक उदाहरण के लिए नीचे दिए गए कोड को देखें, लेकिन यह पूर्ण नहीं है - केवल आपके लिए एक संदर्भ के रूप में और कुछ विचार प्राप्त करें।
यह एक सरल बीन है जिसका उपयोग मैं उस मार्ग की जानकारी को रखने के लिए करता हूं जिसे मैं पार्स करूंगा।
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;
}
}
और किमी को पार्स करने के लिए SAX हैंडलर:
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);
}
}
}
और एक साधारण स्थान
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;
}
}
अंत में मेरे मॉडल में सेवा वर्ग जो गणना कहता है:
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;
}
}
चित्रकारी:
/**
* 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);
}
यह रूटऑवरले वर्ग है:
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);
}
}