codenameone draw routes between two locations using google directions api, sync, async , codenameone-google-maps

GoogleMapsTestApp.java

package com.mycompany.myapp; // change to your package
// goto line 48
import com.codename1.googlemaps.MapContainer;
import com.codename1.io.ConnectionRequest;
import com.codename1.io.JSONParser;
import com.codename1.io.NetworkManager;
import com.codename1.maps.Coord;
import com.codename1.maps.providers.GoogleMapsProvider;
import com.codename1.ui.Display;
import com.codename1.ui.FontImage;
import com.codename1.ui.Form;
import com.codename1.ui.layouts.BorderLayout;
import com.codename1.ui.plaf.Style;
import com.codename1.ui.plaf.UIManager;
import com.codename1.ui.util.Resources;
import com.codename1.util.Callback;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.Map;

public class GoogleMapsTestApp {
    private static final String MAPS_KEY = "YOUR_KEY"; // Your maps key here
    private Form current;

    public void init(Object context) {
        try {
            Resources theme = Resources.openLayered("/theme");
            UIManager.getInstance().setThemeProps(theme.getTheme(theme.getThemeResourceNames()[0]));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void start() {
        if (current != null) {
            current.show();
            return;
        }
        Form hi = new Form("Native Maps Test");
        hi.setLayout(new BorderLayout());
        final MapContainer cnt = new MapContainer(new GoogleMapsProvider(MAPS_KEY));
        hi.addComponent(BorderLayout.CENTER, cnt);
        cnt.setCameraPosition(new Coord(31.2001, 29.9187));

        // HERE
        Coord src = new Coord(31.2001, 29.9187);
        Coord dest = new Coord(30.0444, 31.2357);
        // get the routes using google directions api
        String encoded = getRoutesEncoded(src, dest);
        // decode the routes in an arry of coords
        Coord[] coords = decode(encoded);

        cnt.addPath(coords);

//      if you wanna get it async ...
//        getRoutesEncodedAsync(src, dest, new Callback() {
//            @Override
//            public void onError(Object sender, Throwable err, int errorCode, String errorMessage) {
//
//            }
//
//            @Override
//            public void onSucess(Object encoded) {
//                Coord[] coords = decode((String) encoded);
//                cnt.addPath(coords);
//            }
//        });
        
        Style s = new Style();
        s.setBgTransparency(0);
        s.setFgColor(0x007700);
        cnt.addMarker(FontImage.createMaterial(FontImage.MATERIAL_LOCATION_ON, s).toEncodedImage(), src, "", "", null);
        cnt.addMarker(FontImage.createMaterial(FontImage.MATERIAL_LOCATION_ON, s).toEncodedImage(), dest, "", "", null);

        hi.show();
    }

    public void stop() {
        current = Display.getInstance().getCurrent();
    }

    public void destroy() {
    }

    // src: https://github.com/googlemaps/android-maps-utils/blob/master/library/src/com/google/maps/android/PolyUtil.java
    public static Coord[] decode(final String encodedPath) {
        int len = encodedPath.length();
        final ArrayList<Coord> path = new ArrayList<Coord>();
        int index = 0;
        int lat = 0;
        int lng = 0;

        while (index < len) {
            int result = 1;
            int shift = 0;
            int b;
            do {
                b = encodedPath.charAt(index++) - 63 - 1;
                result += b << shift;
                shift += 5;
            } while (b >= 0x1f);
            lat += (result & 1) != 0 ? ~(result >> 1) : (result >> 1);

            result = 1;
            shift = 0;
            do {
                b = encodedPath.charAt(index++) - 63 - 1;
                result += b << shift;
                shift += 5;
            } while (b >= 0x1f);
            lng += (result & 1) != 0 ? ~(result >> 1) : (result >> 1);

            path.add(new Coord(lat * 1e-5, lng * 1e-5));
        }
        Coord[] p = new Coord[path.size()];
        for (int i = 0; i < path.size(); i++) {
            p[i] = path.get(i);
        }

        return p;
    }

    public static String getRoutesEncoded(Coord src, Coord dest) {
        String ret = "";
        try {
            ConnectionRequest request = new ConnectionRequest("https://maps.googleapis.com/maps/api/directions/json", false);
            request.addArgument("key", MAPS_KEY);
            request.addArgument("origin", src.getLatitude() + "," + src.getLongitude());
            request.addArgument("destination", dest.getLatitude() + "," + dest.getLongitude());

            NetworkManager.getInstance().addToQueueAndWait(request);
            Map<String, Object> response = new JSONParser().parseJSON(new InputStreamReader(new ByteArrayInputStream(request.getResponseData()), "UTF-8"));
            if (response.get("routes") != null) {
                ArrayList routes = (ArrayList) response.get("routes");
                if (routes.size() > 0)
                    ret = ((LinkedHashMap) ((LinkedHashMap) ((ArrayList) response.get("routes")).get(0)).get("overview_polyline")).get("points").toString();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return ret;
    }
    
        public static void getRoutesEncodedAsync(Coord src, Coord dest, Callback callback) {
        ConnectionRequest request = new ConnectionRequest("https://maps.googleapis.com/maps/api/directions/json", false) {
            @Override
            protected void readResponse(InputStream input) throws IOException {
                String ret = "";
                Map<String, Object> response = new JSONParser().parseJSON(new InputStreamReader(input, "UTF-8"));
                if (response.get("routes") != null) {
                    ArrayList routes = (ArrayList) response.get("routes");
                    if (routes.size() > 0)
                        ret = ((LinkedHashMap) ((LinkedHashMap) ((ArrayList) response.get("routes")).get(0)).get("overview_polyline")).get("points").toString();
                }
                callback.onSucess(ret);
            }


        };
        request.addArgument("key", MAPS_KEY);
        request.addArgument("origin", src.getLatitude() + "," + src.getLongitude());
        request.addArgument("destination", dest.getLatitude() + "," + dest.getLongitude());

        NetworkManager.getInstance().addToQueue(request);
    }
}

where did you get this "com.g_ara.gara.controller.MapController;" ?

Hi, I tried your code, but this line shows error, how can I import it? Thanks
import com.g_ara.gara.controller.MapController;

com.g_ara.gara.controller.MapController is a local class that i didn't notice that is there when i created the gist, However i fixed it now.

Really sorry for the inconvenience and the late reply (github didn't notify me)!

Best Regards,
Ahmed

All these lines gives error in my code,i am new in android development please help sir....

import com.codename1.googlemaps.MapContainer;
import com.codename1.io.ConnectionRequest;
import com.codename1.io.JSONParser;
import com.codename1.io.NetworkManager;
import com.codename1.maps.Coord;
import com.codename1.maps.providers.GoogleMapsProvider;
import com.codename1.ui.Display;
import com.codename1.ui.FontImage;
import com.codename1.ui.Form;
import com.codename1.ui.layouts.BorderLayout;
import com.codename1.ui.plaf.Style;
import com.codename1.ui.plaf.UIManager;
import com.codename1.ui.util.Resources;
import com.codename1.util.Callback;

My runs perfectly but no routes or lines are drawn between these points