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POdrawing driving routes using waypoints on android ( Google maps, Google direction api, json parsing, decode google polyline)
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  1. POdrawing driving routes using waypoints on android ( Google maps, Google direction api, json parsing, decode google polyline)
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    copied!<p>drawPath() is used to draw polyloine on map. </p> <pre><code>public void drawPath(String result){ try { final JSONObject jsonObject = new JSONObject(result); JSONArray routeArray = jsonObject.getJSONArray("routes"); JSONObject routes = routeArray.getJSONObject(0); JSONObject overviewPolylines = routes.getJSONObject("overview_polyline"); String encodedString = overviewPolylines.getString("points"); String statusString = jsonObject.getString("status"); Log.d("test: ", encodedString); List&lt;LatLng&gt; list = decodePoly(encodedString); LatLng last = null; for (int i = 0; i &lt; list.size()-1; i++) { LatLng src = list.get(i); LatLng dest = list.get(i+1); last = dest; Log.d("Last latLng:", last.latitude + ", " + last.longitude ); Polyline line = mMap.addPolyline(new PolylineOptions() .add(new LatLng(src.latitude, src.longitude), new LatLng(dest.latitude, dest.longitude)) .width(4) .color(Color.GREEN)); } Log.d("Last latLng:", last.latitude + ", " + last.longitude ); }catch (JSONException e){ e.printStackTrace(); } catch(ArrayIndexOutOfBoundsException e) { System.err.println("Caught ArrayIndexOutOfBoundsException: "+ e.getMessage()); } } private List&lt;LatLng&gt; decodePoly(String encoded){ List&lt;LatLng&gt; poly = new ArrayList&lt;LatLng&gt;(); int index = 0; int length = encoded.length(); int latitude = 0; int longitude = 0; while(index &lt; length){ int b; int shift = 0; int result = 0; do { b = encoded.charAt(index++) - 63; result |= (b &amp; 0x1f) &lt;&lt; shift; shift += 5; } while (b &gt;= 0x20); int destLat = ((result &amp; 1) != 0 ? ~(result &gt;&gt; 1) : (result &gt;&gt; 1)); latitude += destLat; shift = 0; result = 0; do { b = encoded.charAt(index++) - 63; result |= (b &amp; 0x1f) &lt;&lt; shift; shift += 5; } while (b &gt; 0x20); int destLong = ((result &amp; 1) != 0 ? ~(result &gt;&gt; 1) : (result &gt;&gt; 1)); longitude += destLong; poly.add(new LatLng((latitude / 1E5),(longitude / 1E5) )); } return poly; } </code></pre> <p>Now my problem is route is not displayed correctly in the map as it has waypoints in the link. I am using it on android 4.2 </p> <p>My link is <a href="http://maps.googleapis.com/maps/api/directions/json?origin=18.XXX,73.XXXdestination=18.XXX,73.XXX&amp;sensor=false&amp;units=metric&amp;mode=driving&amp;waypoints=via:18.XXX,73.XXX" rel="noreferrer">http://maps.googleapis.com/maps/api/directions/json?origin=18.XXX,73.XXXdestination=18.XXX,73.XXX&amp;sensor=false&amp;units=metric&amp;mode=driving&amp;waypoints=via:18.XXX,73.XXX</a></p>
 

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