Zeichnen Sie Routen zwischen mehreren Punkten auf der Karte

Question

Ich bin neu bei Android. Ich möchte Routen zwischen mehreren Markern zeichnen. I a, Breitengrad, Längengrad und Datetime vom Server erhalten. Jetzt möchte ich die Route zwischen den Punkten zeigen. Ich habe sie in arraylist gespeichert. Hier ist, wie ich die Punkte in der asynchronen Aufgabe doInBackground() bekomme.

newLatt= new ArrayList<String>(); 
    newLongg= new ArrayList<String>(); 
    newdatTime= new ArrayList<String>(); 

    JSONArray arr = new JSONArray(strServerResponse); 
    for (int i = 0; i < arr.length(); i++) { 
     JSONObject jsonObj1 = arr.getJSONObject(i); 
     String status = jsonObj1.optString("status"); 
     if (status!="false"){ 
      Pojo pojo = new Pojo(); 
      String latitude = jsonObj1.optString("Latitude"); 
      String longitude = jsonObj1.optString("Longitude"); 
      String date_time = jsonObj1.optString("date_time"); 
      newLatt.add(latitude); 
      newLongg.add(longitude); 
      newdatTime.add(date_time); 
     }else { 
       Handler handler = new Handler(Looper.getMainLooper()); 
       handler.post(new Runnable() { 
       @Override 
       public void run() { 
        AlertDialog alertDialog = new AlertDialog.Builder(
        MapActivity.this).create(); 
        alertDialog.setMessage("Locations Not Available"); 
        alertDialog.setButton("OK", new DialogInterface.OnClickListener() { 
        public void onClick(DialogInterface dialog, int which) { 
        } 
        }); 
        alertDialog.show(); 
        } 
       } 
     ); 
    } 

und in PostExecute() Methode i Marker zeigt am

 SupportMapFragment supportMapFragment = (SupportMapFragment) getSupportFragmentManager() 
       .findFragmentById(R.id.map); 
     map = supportMapFragment.getMap(); 
     map.setMyLocationEnabled(true); 
     if (newLatt.size()>0){ 
      for (int i = 0; i < newLatt.size(); i++) { 
       Double lati = Double.parseDouble(newLatt.get(i)); 
       Double longi = Double.parseDouble(newLongg.get(i)); 
       String dattme = newdatTime.get(i); 
       dest = new LatLng(lati, longi); 
       if (map != null) { 
        MarkerOptions markerOptions = new MarkerOptions(); 
        markerOptions.position(dest); 
        map.moveCamera(CameraUpdateFactory.newLatLng(dest)); 
        map.animateCamera(CameraUpdateFactory.zoomTo(15)); 

        markerOptions.icon(BitmapDescriptorFactory 
          .defaultMarker(BitmapDescriptorFactory.HUE_RED)); 
        markerOptions.title("" + dattme); 
        map.addMarker(markerOptions); 
        map.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() { 
         @Override 
         public boolean onMarkerClick(Marker marker) { 
          marker.showInfoWindow(); 
          return false; 
         } 
        }); 

UPDATE

PolylineOptions rectOptions = new PolylineOptions(); 
     //this is the color of route 
     rectOptions.color(Color.argb(255, 85, 166, 27)); 
     LatLng startLatLng = null; 
     LatLng endLatLng = null; 
     SupportMapFragment supportMapFragment = (SupportMapFragment) getSupportFragmentManager() 
       .findFragmentById(R.id.map); 
     map = supportMapFragment.getMap(); 
     map.setMyLocationEnabled(true); 
     if (newLatt.size()>0){ 
      for (int i = 0; i < newLatt.size(); i++) { 
       Double lati = Double.parseDouble(newLatt.get(i)); 
       Double longi = Double.parseDouble(newLongg.get(i)); 
       String dattme = newdatTime.get(i); 
       dest = new LatLng(lati, longi); 
       if (map != null) { 
        MarkerOptions markerOptions = new MarkerOptions(); 
        markerOptions.position(dest); 
        map.moveCamera(CameraUpdateFactory.newLatLng(dest)); 
        map.animateCamera(CameraUpdateFactory.zoomTo(15)); 

        markerOptions.icon(BitmapDescriptorFactory 
          .defaultMarker(BitmapDescriptorFactory.HUE_RED)); 
        markerOptions.title("" + dattme); 
        map.addMarker(markerOptions); 
        map.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() { 
         @Override 
         public boolean onMarkerClick(Marker marker) { 
          marker.showInfoWindow(); 
          return false; 
         } 
        }); 

         LatLng latlng = new LatLng(lati, 
           longi); 
         if (i == 0) { 
          startLatLng = latlng; 
         } 
         if (i == newLatt.size() - 1) { 
          endLatLng = latlng; 
         } 
         rectOptions.add(latlng); 
        String url = getDirectionsUrl(startLatLng, endLatLng); 
        DownloadTask downloadTask = new DownloadTask(); 
        downloadTask.execute(url); 
       } 

      } 
      map.addPolyline(rectOptions); 

GetDirections:

private String getDirectionsUrl(LatLng origin, LatLng dest) { 
    // Origin of route 
    String str_origin = "origin=" + origin.latitude + "," 
      + origin.longitude; 

    // Destination of route 
    String str_dest = "destination=" + dest.latitude + "," + dest.longitude; 

    // Sensor enabled 
    String sensor = "sensor=false"; 

    // Building the parameters to the web service 
    String parameters = str_origin + "&" + str_dest + "&" + sensor; 

    // Output format 
    String output = "json"; 

    // Building the url to the web service 
    String url = "https://maps.googleapis.com/maps/api/directions/" 
      + output + "?" + parameters; 

    return url; 
} 

Answer 1

Android does not provide embedded direction service in google map api. To draw route between points you must use google direction services REST API . 
You can get complete code and description from http://wptrafficanalyzer.in/blog/drawing-driving-route-directions-between-two-locations-using-google-directions-in-google-map-android-api-v2/ 


ArrayList<LatLng> points = null; 
      PolylineOptions lineOptions = null; 
      MarkerOptions markerOptions = new MarkerOptions(); 

      // Traversing through all the routes 
      for(int i=0;i<result.size();i++){ 
       points = new ArrayList<LatLng>(); 
       lineOptions = new PolylineOptions(); 

       // Fetching i-th route 
       List<HashMap<String, String>> path = result.get(i); 

       // Fetching all the points in i-th route 
       for(int j=0;j<path.size();j++){ 
        HashMap<String,String> point = path.get(j); 

        double lat = Double.parseDouble(point.get("lat")); 
        double lng = Double.parseDouble(point.get("lng")); 
        LatLng position = new LatLng(lat, lng); 

        points.add(position); 
       } 

       // Adding all the points in the route to LineOptions 
       lineOptions.addAll(points); 
       lineOptions.width(2); 
       lineOptions.color(Color.RED); 
      } 

      // Drawing polyline in the Google Map for the i-th route 
      map.addPolyline(lineOptions); 

Answer 2

Fügen Sie in Ihrem postExecute den folgenden Code hinzu, um Ploylines auf der Karte hinzuzufügen.

   PolylineOptions rectOptions = new PolylineOptions(); 
       //this is the color of route 
       rectOptions.color(Color.argb(255, 85, 166, 27)); 

       LatLng startLatLng = null; 
       LatLng endLatLng = null; 
       for (int i = 0; i < newLatt.size(); i++) { 
       Double lati = Double.parseDouble(newLatt.get(i)); 
       Double longi = Double.parseDouble(newLongg.get(i)); 
        LatLng latlng = new LatLng(lati, 
          longi); 
        if (i == 0) { 
         startLatLng = latlng; 
        } 
        if (i == jArr.length() - 1) { 
         endLatLng = latlng; 
        } 
        rectOptions.add(latlng); 
       } 
       map.addPolyline(rectOptions); 

Glückliche Codierung ...