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POGoogle Maps Android V2 and Direction API
 

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  1. POGoogle Maps Android V2 and Direction API
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    <p>I'm developing an app where i need to know the path between the current user posistion and a point of interest.</p> <p>I'm using android 2.3.3, google maps android v2 and direction api. My problem is that all the code i have found is for the old version of the maps, and I also tried to adapt the code but i failed. I try to change GeoPoint (not supported in this new versione) in LatLng. the problem is that i can't display the path, to do it i create a new polyline and i add it to the map. </p> <p>i post my code:</p> <p>Parser:</p> <pre><code>public interface Parser { public Route parse(); } </code></pre> <p>XMLParser</p> <pre><code>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; } } } </code></pre> <p>JsonParser (parse the google direction json)</p> <pre><code>public class JsonParser extends XMLParser implements Parser { /** Distance covered. **/ private int distance; public JsonParser(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 &amp; 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 &lt; 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 LatLng position = new LatLng(start.getDouble("lat"), start.getDouble("lng")); 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("&lt;(.*?)*&gt;", "")); //Retrieve &amp; 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 LatLng. * @param poly polyline encoded string to decode. * @return the list of GeoPoints represented by this polystring. */ private List&lt;LatLng&gt; decodePolyLine(final String poly) { int len = poly.length(); int index = 0; List&lt;LatLng&gt; decoded = new LinkedList&lt;LatLng&gt;(); int lat = 0; int lng = 0; while (index &lt; len) { int b; int shift = 0; int result = 0; do { b = poly.charAt(index++) - 63; result |= (b &amp; 0x1f) &lt;&lt; shift; shift += 5; } while (b &gt;= 0x20); int dlat = ((result &amp; 1) != 0 ? ~(result &gt;&gt; 1) : (result &gt;&gt; 1)); lat += dlat; shift = 0; result = 0; do { b = poly.charAt(index++) - 63; result |= (b &amp; 0x1f) &lt;&lt; shift; shift += 5; } while (b &gt;= 0x20); int dlng = ((result &amp; 1) != 0 ? ~(result &gt;&gt; 1) : (result &gt;&gt; 1)); lng += dlng; decoded.add(new LatLng((lat / 1E5),(lng / 1E5))); } return decoded; } } </code></pre> <p>Route (to save json info)</p> <pre><code>public class Route { private String name; private final List&lt;LatLng&gt; points; private List&lt;Segment&gt; segments; private String copyright; private String warning; private String country; private int length; private String polyline; public Route() { points = new LinkedList&lt;LatLng&gt;(); segments = new LinkedList&lt;Segment&gt;(); } public void addPoint(final LatLng p) { points.add(p); } public void addPoints(final List&lt;LatLng&gt; points) { this.points.addAll(points); } public List&lt;LatLng&gt; getPoints() { return points; } public void addSegment(final Segment s) { segments.add(s); } public List&lt;Segment&gt; 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; } } </code></pre> <p>Segment:</p> <pre><code>public class Segment { /** Points in this segment. **/ private LatLng 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 LatLng to add. */ public void setPoint(LatLng point) { start = point; } /** Get the starting point of this * segment. * @return a LatLng */ public LatLng 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; } } </code></pre> <p>My MainActivity (there are 326 code line because of user localization, you can find it on google developer site, so we can just suppose to have two static point A and B and I want to go from A to B):</p> <pre><code>public class MainActivity extends FragmentActivity{ private GoogleMap map; private Marker currentLocation; private PolylineOptions pathLine; private LatLng imhere = new LatLng(41.8549038,12.4618208); private LatLng poi = new LatLng(41.89000,12.49324); private LocationManager mLocationManager; private Handler mHandler; private boolean mUseBoth; private Context context; // Keys for maintaining UI states after rotation. private static final String KEY_BOTH = "use_both"; // UI handler codes. private static final int UPDATE_LATLNG = 2; private static final int FIVE_SECONDS = 5000; private static final int THREE_METERS = 3; private static final int TWO_MINUTES = 1000 * 60 * 2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap(); Marker colosseoMarker = map.addMarker(new MarkerOptions() .position(colosseo) .title("Start") .snippet("poi") .icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher))); Marker current pos = map.addMarker(new MarkerOptions() .position(imhere) .title("i'm here") .snippet("here!") .icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher))); context =this ; map.setOnMarkerClickListener(new OnMarkerClickListener() { @Override public boolean onMarkerClick(Marker marker) { final String[] options = {"Calcola il Percorso"}; AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setTitle("Ottieni Informazioni aggiuntive"); builder.setPositiveButton("Calcola Percorso",new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog,int id) { LatLng start = new LatLng(imhere.latitude,imhere.longitude); LatLng dest = new LatLng(poi.latitude, poi.longitude); Route route = drawPath(start, dest); List&lt;LatLng&gt; list= route.getPoints(); if(pathLine!= null) pathline =null; pathLine = new PolylineOptions(); pathLine.addAll(list); pathLine.color(Color.rgb(0,191,255)); map.addPolyline(pathLine); } }); AlertDialog alert = builder.create(); alert.show(); Toast.makeText(MainActivity.this, marker.getSnippet(),Toast.LENGTH_SHORT).show(); return true; } }); map.animateCamera(CameraUpdateFactory.newLatLngZoom(imhere, 12)); } } }; // Get a reference to the LocationManager object. mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); } private Route drawPath(LatLng start, LatLng dest) { Parser parser; String jsonURL = "http://maps.google.com/maps/api/directions/json?"; final StringBuffer sBuf = new StringBuffer(jsonURL); sBuf.append("origin="); sBuf.append(start.latitude); sBuf.append(','); sBuf.append(start.longitude); sBuf.append("&amp;destination="); sBuf.append(dest.latitude); sBuf.append(','); sBuf.append(dest.longitude); sBuf.append("&amp;sensor=true&amp;mode=walking"); parser = new JsonParser(sBuf.toString()); Route r = parser.parse(); return r; } } </code></pre> <p>every suggestion is well accepted</p>
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    1. COin JsonParser I changed decoded.add(new LatLng((lat*1E6 / 1E5),(lng*1E6 / 1E5))); with decoded.add(new LatLng((lat/ 1E5),(lng / 1E5))); to get double (i think...) and it's work, but sometimes the app stops work when i ask it to redrow the path
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      1. POGoogle Maps Android V2 and Direction API
      1. USantedesk
    2. COA few problems in the `Activity`. The JSON call using `drawPath` should be done in an `AsyncTask`. Before working with the `map`, make sure it's ready to use, see the sample code in the SDK for `setUpMapIfNeeded` advised to be run in `onResume()`. `map.clear()` to clear the map before redrawing.
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      1. POGoogle Maps Android V2 and Direction API
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    3. COyes thank you, i use an `AsyncTask` and now it's better. Now I'm trying to use `setUpMapIfNeeded` and `map.clear()`
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      1. POGoogle Maps Android V2 and Direction API
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