Warum funktioniert das Abrufen von Google Directions für Android mit KML-Daten nicht mehr?

Mögliche Duplikate:
Google Maps-Ausgabe = kml gebrochen?

Ich fing an, Fehler zu erhalten, wenn ich seit einigen Tagen Google Directions mit KML-Daten abrufen möchte. Der Fehler scheint, dass die angeforderte URL KML-Daten nicht mehr zurückholt, sondern eine ganze Seite zurückgibt. Ich bin dem gefolgt, um das zu erreichen.

Was ist die Lösung dafür? Gibt es Alternativen?

   

    Aktualisieren:

    Da Android Google Maps v2 nun verwendet wird, muss der Code angepasst werden, um auf v2-Karten zu arbeiten, die hier zu finden sind .


    Ursprüngliche Antwort:

    Diese Methode zum Extrahieren der Google Directions von Google durch Parsing der KML-Datei ist seit dem 27. Juli 2012 nicht mehr verfügbar (da Google die Struktur zum Abrufen von Google Directions geändert hat und jetzt nur von JSON oder XML abgerufen werden kann), ist es an der Zeit Migrieren Sie Ihren Code zu JSON statt KML.

    Ich habe es geschafft, indem ich 6 classn wie folgt erstellt habe:

    Parser.java :

    public interface Parser { public Route parse(); } 

    XMLParser.java :

     public class XMLParser { // names of the XML tags protected static final String MARKERS = "markers"; protected static final String MARKER = "marker"; protected URL feedUrl; protected XMLParser(final String feedUrl) { try { this.feedUrl = new URL(feedUrl); } catch (MalformedURLException e) { //Log.e(e.getMessage(), "XML parser - " + feedUrl); } } protected InputStream getInputStream() { try { return feedUrl.openConnection().getInputStream(); } catch (IOException e) { //Log.e(e.getMessage(), "XML parser - " + feedUrl); return null; } } } 

    Segment.java :

     public class Segment { /** Points in this segment. **/ private GeoPoint start; /** Turn instruction to reach next segment. **/ private String instruction; /** Length of segment. **/ private int length; /** Distance covered. **/ private double distance; /** * Create an empty segment. */ public Segment() { } /** * Set the turn instruction. * @param turn Turn instruction string. */ public void setInstruction(final String turn) { this.instruction = turn; } /** * Get the turn instruction to reach next segment. * @return a String of the turn instruction. */ public String getInstruction() { return instruction; } /** * Add a point to this segment. * @param point GeoPoint to add. */ public void setPoint(final GeoPoint point) { start = point; } /** Get the starting point of this * segment. * @return a GeoPoint */ public GeoPoint startPoint() { return start; } /** Creates a segment which is a copy of this one. * @return a Segment that is a copy of this one. */ public Segment copy() { final Segment copy = new Segment(); copy.start = start; copy.instruction = instruction; copy.length = length; copy.distance = distance; return copy; } /** * @param length the length to set */ public void setLength(final int length) { this.length = length; } /** * @return the length */ public int getLength() { return length; } /** * @param distance the distance to set */ public void setDistance(double distance) { this.distance = distance; } /** * @return the distance */ public double getDistance() { return distance; } } 

    Route.java :

     public class Route { private String name; private final List points; private List segments; private String copyright; private String warning; private String country; private int length; private String polyline; public Route() { points = new ArrayList(); segments = new ArrayList(); } public void addPoint(final GeoPoint p) { points.add(p); } public void addPoints(final List points) { this.points.addAll(points); } public List getPoints() { return points; } public void addSegment(final Segment s) { segments.add(s); } public List getSegments() { return segments; } /** * @param name the name to set */ public void setName(final String name) { this.name = name; } /** * @return the name */ public String getName() { return name; } /** * @param copyright the copyright to set */ public void setCopyright(String copyright) { this.copyright = copyright; } /** * @return the copyright */ public String getCopyright() { return copyright; } /** * @param warning the warning to set */ public void setWarning(String warning) { this.warning = warning; } /** * @return the warning */ public String getWarning() { return warning; } /** * @param country the country to set */ public void setCountry(String country) { this.country = country; } /** * @return the country */ public String getCountry() { return country; } /** * @param length the length to set */ public void setLength(int length) { this.length = length; } /** * @return the length */ public int getLength() { return length; } /** * @param polyline the polyline to set */ public void setPolyline(String polyline) { this.polyline = polyline; } /** * @return the polyline */ public String getPolyline() { return polyline; } } 

    GoogleParser.java :

     public class GoogleParser extends XMLParser implements Parser { /** Distance covered. **/ private int distance; public GoogleParser(String feedUrl) { super(feedUrl); } /** * Parses a url pointing to a Google JSON object to a Route object. * @return a Route object based on the JSON object. */ public Route parse() { // turn the stream into a string final String result = convertStreamToString(this.getInputStream()); //Create an empty route final Route route = new Route(); //Create an empty segment final Segment segment = new Segment(); try { //Tranform the string into a json object final JSONObject json = new JSONObject(result); //Get the route object final JSONObject jsonRoute = json.getJSONArray("routes").getJSONObject(0); //Get the leg, only one leg as we don't support waypoints final JSONObject leg = jsonRoute.getJSONArray("legs").getJSONObject(0); //Get the steps for this leg final JSONArray steps = leg.getJSONArray("steps"); //Number of steps for use in for loop final int numSteps = steps.length(); //Set the name of this route using the start & end addresses route.setName(leg.getString("start_address") + " to " + leg.getString("end_address")); //Get google's copyright notice (tos requirement) route.setCopyright(jsonRoute.getString("copyrights")); //Get the total length of the route. route.setLength(leg.getJSONObject("distance").getInt("value")); //Get any warnings provided (tos requirement) if (!jsonRoute.getJSONArray("warnings").isNull(0)) { route.setWarning(jsonRoute.getJSONArray("warnings").getString(0)); } /* Loop through the steps, creating a segment for each one and * decoding any polylines found as we go to add to the route object's * map array. Using an explicit for loop because it is faster! */ for (int i = 0; i < numSteps; i++) { //Get the individual step final JSONObject step = steps.getJSONObject(i); //Get the start position for this step and set it on the segment final JSONObject start = step.getJSONObject("start_location"); final GeoPoint position = new GeoPoint((int) (start.getDouble("lat")*1E6), (int) (start.getDouble("lng")*1E6)); segment.setPoint(position); //Set the length of this segment in metres final int length = step.getJSONObject("distance").getInt("value"); distance += length; segment.setLength(length); segment.setDistance(distance/1000); //Strip html from google directions and set as turn instruction segment.setInstruction(step.getString("html_instructions").replaceAll("<(.*?)*>", "")); //Retrieve & decode this segment's polyline and add it to the route. route.addPoints(decodePolyLine(step.getJSONObject("polyline").getString("points"))); //Push a copy of the segment to the route route.addSegment(segment.copy()); } } catch (JSONException e) { Log.e(e.getMessage(), "Google JSON Parser - " + feedUrl); } return route; } /** * Convert an inputstream to a string. * @param input inputstream to convert. * @return a String of the inputstream. */ private static String convertStreamToString(final InputStream input) { final BufferedReader reader = new BufferedReader(new InputStreamReader(input)); final StringBuilder sBuf = new StringBuilder(); String line = null; try { while ((line = reader.readLine()) != null) { sBuf.append(line); } } catch (IOException e) { Log.e(e.getMessage(), "Google parser, stream2string"); } finally { try { input.close(); } catch (IOException e) { Log.e(e.getMessage(), "Google parser, stream2string"); } } return sBuf.toString(); } /** * Decode a polyline string into a list of GeoPoints. * @param poly polyline encoded string to decode. * @return the list of GeoPoints represented by this polystring. */ private List decodePolyLine(final String poly) { int len = poly.length(); int index = 0; List decoded = new ArrayList(); int lat = 0; int lng = 0; while (index < len) { int b; int shift = 0; int result = 0; do { b = poly.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 = poly.charAt(index++) - 63; result |= (b & 0x1f) < < shift; shift += 5; } while (b >= 0x20); int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1)); lng += dlng; decoded.add(new GeoPoint( (int) (lat*1E6 / 1E5), (int) (lng*1E6 / 1E5))); } return decoded; } } 

    RouteOverlay.java :

     public class RouteOverlay extends Overlay { /** GeoPoints representing this routePoints. **/ private final List routePoints; /** Colour to paint routePoints. **/ private int colour; /** Alpha setting for route overlay. **/ private static final int ALPHA = 120; /** Stroke width. **/ private static final float STROKE = 4.5f; /** Route path. **/ private final Path path; /** Point to draw with. **/ private final Point p; /** Paint for path. **/ private final Paint paint; /** * Public constructor. * * @param route Route object representing the route. * @param defaultColour default colour to draw route in. */ public RouteOverlay(final Route route, final int defaultColour) { super(); routePoints = route.getPoints(); colour = defaultColour; path = new Path(); p = new Point(); paint = new Paint(); } @Override public final void draw(final Canvas c, final MapView mv, final boolean shadow) { super.draw(c, mv, shadow); paint.setColor(colour); paint.setAlpha(ALPHA); paint.setAntiAlias(true); paint.setStrokeWidth(STROKE); paint.setStyle(Paint.Style.STROKE); redrawPath(mv); c.drawPath(path, paint); } /** * Set the colour to draw this route's overlay with. * * @param c Int representing colour. */ public final void setColour(final int c) { colour = c; } /** * Clear the route overlay. */ public final void clear() { routePoints.clear(); } /** * Recalculate the path accounting for changes to * the projection and routePoints. * @param mv MapView the path is drawn to. */ private void redrawPath(final MapView mv) { final Projection prj = mv.getProjection(); path.rewind(); final Iterator it = routePoints.iterator(); prj.toPixels(it.next(), p); path.moveTo(px, py); while (it.hasNext()) { prj.toPixels(it.next(), p); path.lineTo(px, py); } path.setLastPoint(px, py); } } 

    Und dann tun Sie dies innerhalb der Aktivität, die die Karte enthält:

    1-Fügen Sie diese function hinzu:

     private Route directions(final GeoPoint start, final GeoPoint dest) { Parser parser; //https://developers.google.com/maps/documentation/directions/#JSON < - get api String jsonURL = "http://maps.googleapis.com/maps/api/directions/json?"; final StringBuffer sBuf = new StringBuffer(jsonURL); sBuf.append("origin="); sBuf.append(start.getLatitudeE6()/1E6); sBuf.append(','); sBuf.append(start.getLongitudeE6()/1E6); sBuf.append("&destination="); sBuf.append(dest.getLatitudeE6()/1E6); sBuf.append(','); sBuf.append(dest.getLongitudeE6()/1E6); sBuf.append("&sensor=true&mode=driving"); parser = new GoogleParser(sBuf.toString()); Route r = parser.parse(); return r; } 

    2- Fügen Sie dies in der onCreate() function hinzu:

     MapView mapView = (MapView) findViewById(R.id.mapview); //or you can declare it directly with the API key Route route = directions(new GeoPoint((int)(26.2*1E6),(int)(50.6*1E6)), new GeoPoint((int)(26.3*1E6),(int)(50.7*1E6))); RouteOverlay routeOverlay = new RouteOverlay(route, Color.BLUE); mapView.getOverlays().add(routeOverlay); mapView.invalidate(); 

    BEARBEITEN: Wenn Sie eine Ausnahme erhalten, verwenden Sie die function directions() in einer AsyncTask , um die Netzwerkverarbeitung auf dem UI-Thread zu vermeiden.