Show routes between multiple points on Google Maps

Question

I\'ve created my own custom map to show my current location and multiple points on map. it works fine,but now i would like to show a route from my current location to every

Answer 1

package org.ci.geo.route.android;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;

import org.ci.geo.route.Road;
import org.ci.geo.route.RoadProvider;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Bitmap.Config;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;

public class MapRouteActivity extends MapActivity {

        LinearLayout linearLayout;
        MapView mapView;
        private Road mRoad;

        @Override
        public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.main);
                mapView = (MapView) findViewById(R.id.mapview);
                mapView.setBuiltInZoomControls(true);

                new Thread() {
                        @Override
                        public void run() {
                                double fromLat = 49.85, fromLon = 24.016667, toLat = 50.45, toLon = 30.523333;
                                String url = RoadProvider
                                                .getUrl(fromLat, fromLon, toLat, toLon);
                                InputStream is = getConnection(url);
                                mRoad = RoadProvider.getRoute(is);
                                mHandler.sendEmptyMessage(0);
                        }
                }.start();
        }

        Handler mHandler = new Handler() {
                public void handleMessage(android.os.Message msg) {
                        TextView textView = (TextView) findViewById(R.id.description);
                        textView.setText(mRoad.mName + " " + mRoad.mDescription);
                        MapOverlay mapOverlay = new MapOverlay(mRoad, mapView);
                        List listOfOverlays = mapView.getOverlays();
                        listOfOverlays.clear();
                        listOfOverlays.add(mapOverlay);
                        mapView.invalidate();
                };
        };

        private InputStream getConnection(String url) {
                InputStream is = null;
                try {
                        URLConnection conn = new URL(url).openConnection();
                        is = conn.getInputStream();
                } catch (MalformedURLException e) {
                        e.printStackTrace();
                } catch (IOException e) {
                        e.printStackTrace();
                }
                return is;
        }

        @Override
        protected boolean isRouteDisplayed() {
                return false;
        }
}

class MapOverlay extends com.google.android.maps.Overlay {
        Road mRoad;
        ArrayList mPoints;

        public MapOverlay(Road road, MapView mv) {
                mRoad = road;
                if (road.mRoute.length > 0) {
                        mPoints = new ArrayList();
                        for (int i = 0; i < road.mRoute.length; i++) {
                                mPoints.add(new GeoPoint((int) (road.mRoute[i][1] * 1000000),
                                                (int) (road.mRoute[i][0] * 1000000)));
                        }
                        int moveToLat = (mPoints.get(0).getLatitudeE6() + (mPoints.get(
                                        mPoints.size() - 1).getLatitudeE6() - mPoints.get(0)
                                        .getLatitudeE6()) / 2);
                        int moveToLong = (mPoints.get(0).getLongitudeE6() + (mPoints.get(
                                        mPoints.size() - 1).getLongitudeE6() - mPoints.get(0)
                                        .getLongitudeE6()) / 2);
                        GeoPoint moveTo = new GeoPoint(moveToLat, moveToLong);

                        MapController mapController = mv.getController();
                        mapController.animateTo(moveTo);
                        mapController.setZoom(7);
                }
        }

        @Override
        public boolean draw(Canvas canvas, MapView mv, boolean shadow, long when) {
                super.draw(canvas, mv, shadow);
                drawPath(mv, canvas);
                return true;
        }

        public void drawPath(MapView mv, Canvas canvas) {
                int x1 = -1, y1 = -1, x2 = -1, y2 = -1;
                Paint paint = new Paint();
                paint.setColor(Color.GREEN);
                paint.setStyle(Paint.Style.STROKE);
                paint.setStrokeWidth(3);
                for (int i = 0; i < mPoints.size(); i++) {
                        Point point = new Point();
                        mv.getProjection().toPixels(mPoints.get(i), point);
                        x2 = point.x;
                        y2 = point.y;
                        if (i > 0) {
                                canvas.drawLine(x1, y1, x2, y2, paint);
                        }
                        x1 = x2;
                        y1 = y2;
                }
        }
}


http://code.google.com/p/j2memaprouteprovider/source/browse/trunk/J2MEMapRouteAndroidEx/src/org/ci/geo/route/android/MapRouteActivity.java