MainActivity.java

package com.github.polok.routedrawer.demo;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;

import com.github.polok.routedrawer.RouteDrawer;
import com.github.polok.routedrawer.RouteRest;
import com.github.polok.routedrawer.model.Routes;
import com.github.polok.routedrawer.model.TravelMode;
import com.github.polok.routedrawer.parser.RouteJsonParser;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;

import rx.android.schedulers.AndroidSchedulers;
import rx.functions.Action1;
import rx.functions.Func1;

public class MainActivity extends Activity {

    private GoogleMap googleMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        googleMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();

        final RouteDrawer routeDrawer = new RouteDrawer.RouteDrawerBuilder(googleMap)
                .withColor(Color.BLUE)
                .withWidth(8)
                .withAlpha(0.5f)
                .withMarkerIcon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE))
                .build();

        RouteRest routeRest = new RouteRest();

        routeRest.getJsonDirections(new LatLng(50.126922, 19.015261), new LatLng(50.200206, 19.175603), TravelMode.DRIVING)
                .observeOn(AndroidSchedulers.mainThread())
                .map(new Func1<String, Routes>() {
                    @Override
                    public Routes call(String s) {
                        return new RouteJsonParser<Routes>().parse(s, Routes.class);
                    }
                })
                .subscribe(new Action1<Routes>() {
                    @Override
                    public void call(Routes r) {
                        routeDrawer.drawPath(r);
                    }
                });

    }
}