Draw Route line with alternative routes on map

This example shows:

  • How to fetch a route with an alternative route using RouteRequestParams

    • .origin(origin)
    • .destination(destination)
    • .alternatives(true)
    • .altCount(2)
  • How to draw a route with alternative routes navMap.drawRoutes(directionsRoutes);

  • How to show or hide the route duration symbol next to every single route line navMap.showRouteDurationSymbol(boolean);

docs-image

For all code examples, refer to Navigation Code Examples

activity_draw_route_line_with_alt.xml view source

1<?xml version="1.0" encoding="utf-8"?>
2<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 xmlns:app="http://schemas.android.com/apk/res-auto"
4 xmlns:tools="http://schemas.android.com/tools"
5 android:layout_width="match_parent"
6 android:layout_height="match_parent">
7
8 <ai.nextbillion.maps.core.MapView
9 android:id="@+id/mapView"
10 android:layout_width="match_parent"
11 android:layout_height="match_parent"
12 app:nbmap_uiAttribution="false">
13 </ai.nextbillion.maps.core.MapView>
14
15 <LinearLayout
16 android:layout_width="wrap_content"
17 android:layout_height="wrap_content"
18 android:paddingLeft="10dp"
19 android:orientation="vertical"
20 android:layout_gravity="bottom">
21 <Button
22 android:id="@+id/fetchRoute"
23 android:layout_width="wrap_content"
24 android:layout_height="wrap_content"
25 android:textSize="12sp"
26 android:text="@string/draw_route"/>
27
28 <Button
29 android:id="@+id/hideRouteDuration"
30 android:layout_width="wrap_content"
31 android:layout_height="wrap_content"
32 android:textSize="12sp"
33 android:text="@string/draw_route_without"/>
34
35 <Button
36 android:id="@+id/startNav"
37 android:layout_width="wrap_content"
38 android:layout_height="wrap_content"
39 android:textSize="12sp"
40 android:text="@string/start_navigation"/>
41
42 </LinearLayout>
43
44 <ProgressBar
45 android:id="@+id/progress"
46 android:visibility="gone"
47 android:layout_width="wrap_content"
48 android:layout_height="wrap_content"
49 android:layout_gravity="center"/>
50</FrameLayout>

DrawRouteLineWithAltActivity view source

1package ai.nextbillion.navigation.demo.activity;
2
3import android.os.Bundle;
4import android.view.View;
5import android.widget.Button;
6import android.widget.ProgressBar;
7
8import java.util.List;
9
10import ai.nextbillion.kits.directions.models.DirectionsResponse;
11import ai.nextbillion.kits.directions.models.DirectionsRoute;
12import ai.nextbillion.kits.directions.models.RouteRequestParams;
13import ai.nextbillion.kits.geojson.Point;
14import ai.nextbillion.maps.camera.CameraUpdate;
15import ai.nextbillion.maps.camera.CameraUpdateFactory;
16import ai.nextbillion.maps.core.MapView;
17import ai.nextbillion.maps.core.NextbillionMap;
18import ai.nextbillion.maps.core.OnMapReadyCallback;
19import ai.nextbillion.maps.geometry.LatLng;
20import ai.nextbillion.maps.location.modes.RenderMode;
21import ai.nextbillion.navigation.core.routefetcher.RouteFetcher;
22import ai.nextbillion.navigation.demo.R;
23import ai.nextbillion.navigation.demo.utils.CameraAnimateUtils;
24import ai.nextbillion.navigation.ui.NavLauncherConfig;
25import ai.nextbillion.navigation.ui.NavigationLauncher;
26import ai.nextbillion.navigation.ui.camera.CameraUpdateMode;
27import ai.nextbillion.navigation.ui.camera.NavigationCameraUpdate;
28import ai.nextbillion.navigation.ui.map.NavNextbillionMap;
29import androidx.annotation.NonNull;
30import androidx.appcompat.app.AppCompatActivity;
31import retrofit2.Call;
32import retrofit2.Callback;
33import retrofit2.Response;
34
35public class DrawRouteLineWithAltActivity extends AppCompatActivity implements OnMapReadyCallback, View.OnClickListener {
36
37 private static final double DEFAULT_CAMERA_ZOOM = 14;
38
39 private Point origin = Point.fromLngLat(78.37463792413473, 17.457302037173775);
40 private Point destination = Point.fromLngLat(78.3726774987914, 17.466320809357967);
41
42 private MapView mapView;
43 private NavNextbillionMap navMap;
44
45 private Button fetchRoute;
46 private Button fetchRouteWithoutDuration;
47 private Button startNav;
48 private DirectionsRoute directionsRoute;
49 private List<DirectionsRoute> directionsRoutes;
50 private ProgressBar progress;
51 boolean showRouteDurationSymbol = true;
52 @Override
53 protected void onCreate(Bundle savedInstanceState) {
54 super.onCreate(savedInstanceState);
55 setContentView(R.layout.activity_draw_route_line_with_alt);
56 mapView = findViewById(R.id.mapView);
57 mapView.onCreate(savedInstanceState);
58 mapView.getMapAsync(this);
59 fetchRoute = findViewById(R.id.fetchRoute);
60 fetchRouteWithoutDuration = findViewById(R.id.hideRouteDuration);
61 startNav = findViewById(R.id.startNav);
62 progress = findViewById(R.id.progress);
63 fetchRoute.setOnClickListener(this);
64 startNav.setOnClickListener(this);
65 fetchRouteWithoutDuration.setOnClickListener(this);
66 fetchRouteWithoutDuration.setEnabled(false);
67 startNav.setEnabled(false);
68 fetchRoute.setEnabled(false);
69 }
70
71 @Override
72 public void onMapReady(@NonNull NextbillionMap nextbillionMap) {
73 nextbillionMap.getStyle(style -> {
74 navMap = new NavNextbillionMap(mapView, nextbillionMap);
75 CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(new LatLng(origin.latitude(),origin.longitude()), DEFAULT_CAMERA_ZOOM);
76 NavigationCameraUpdate navigationCameraUpdate = new NavigationCameraUpdate(cameraUpdate);
77 navigationCameraUpdate.setMode(CameraUpdateMode.OVERRIDE);
78 navMap.retrieveCamera().update(navigationCameraUpdate, 1000);
79 fetchRoute.setEnabled(true);
80 fetchRouteWithoutDuration.setEnabled(true);
81 });
82 }
83
84
85 @Override
86 public void onClick(View view) {
87 if (view.getId() == R.id.fetchRoute) {
88 showRouteDurationSymbol = true;
89 fetchRoute();
90 } else if (view.getId() == R.id.hideRouteDuration) {
91 showRouteDurationSymbol = false;
92 fetchRoute();
93 } else if (view.getId() == R.id.startNav) {
94 NavLauncherConfig.Builder configBuilder = NavLauncherConfig.builder(directionsRoute);
95 configBuilder.routes(directionsRoutes);
96 configBuilder.locationLayerRenderMode(RenderMode.GPS);
97 configBuilder.shouldSimulateRoute(true);
98 NavigationLauncher.startNavigation(DrawRouteLineWithAltActivity.this, configBuilder.build());
99 }
100 }
101
102 private void fetchRoute() {
103 progress.setVisibility(View.VISIBLE);
104
105 RouteRequestParams.Builder builder = RouteRequestParams.builder()
106 .origin(origin)
107 .destination(destination)
108 .alternatives(true)
109 .altCount(2)
110 .language("en")
111 .departureTime((int) (System.currentTimeMillis()/1000));
112
113 RouteFetcher.getRoute(builder.build(), new Callback<DirectionsResponse>() {
114 @Override
115 public void onResponse(Call<DirectionsResponse> call, Response<DirectionsResponse> response) {
116 progress.setVisibility(View.GONE);
117 //start navigation with the route we just fetched.
118 if (response.body() != null && !response.body().routes().isEmpty()) {
119 directionsRoute = response.body().routes().get(0);
120 directionsRoutes = response.body().routes();
121 drawRouteLine();
122 startNav.setEnabled(true);
123 }
124 }
125
126 @Override
127 public void onFailure(Call<DirectionsResponse> call, Throwable t) {
128 progress.setVisibility(View.GONE);
129 }
130 });
131 }
132
133 private void drawRouteLine() {
134 navMap.removeRoute();
135 navMap.clearMarkers();
136 navMap.showRouteDurationSymbol(showRouteDurationSymbol);
137 navMap.drawRoutes(directionsRoutes);
138 frameCameraToRoute();
139 }
140
141 private void frameCameraToRoute() {
142 int[] padding = CameraAnimateUtils.createPadding(this);
143 CameraAnimateUtils.frameCameraToBounds(navMap, directionsRoutes, padding);
144 }
145
146 @Override
147 protected void onStart() {
148 super.onStart();
149 mapView.onStart();
150 }
151
152 @Override
153 protected void onResume() {
154 super.onResume();
155 mapView.onResume();
156 }
157
158 @Override
159 protected void onPause() {
160 super.onPause();
161 mapView.onPause();
162 }
163
164 @Override
165 public void onLowMemory() {
166 super.onLowMemory();
167 mapView.onLowMemory();
168 }
169
170 @Override
171 protected void onStop() {
172 super.onStop();
173 mapView.onStop();
174 }
175
176 @Override
177 protected void onDestroy() {
178 mapView.onDestroy();
179 super.onDestroy();
180 }
181
182 @Override
183 protected void onSaveInstanceState(@NonNull Bundle outState) {
184 super.onSaveInstanceState(outState);
185 mapView.onSaveInstanceState(outState);
186 }
187
188}

Code Highlights

This Code example includes How to display a MapView and draw route lines with alternative routes on the map using NavNextbillionMap and start navigation with drawn routes using NavigationLauncher

In particular, this example shows we can display or hide the route duration symbol via function navMap.showRouteDurationSymbol(), and we can also let navigation API return more than 1 route result if available, by setting RouteRequestParams.alternatives as true, and RouteRequestParams.altCount as the desired route count you wish to have.

Code summary

Map Initialization:

  • The onMapReady() method is called when the map is ready to be used.

  • The NavNextbillionMap class is used to create a navigation-enabled map by passing the MapView and NextbillionMap instances.

  • The camera position is set to the origin point with a default zoom level using CameraUpdateFactory.newLatLngZoom() and NavigationCameraUpdate.

Fetch route with RouteFetcher

  • Constructs a RouteRequestParams object with the

    • origin

    • destination

    • language

    • alternatives

    • altCount

    • departure time

  • The RouteFetcher.getRoute() method is used to fetch the route using the RouteRequestParams.

Draw route with/without duration symbol

  • The route is drawn on the map using navMap.drawRoutes()

  • The camera is framed to fit the route using frameCameraToRoute()

  • To show or hide the duration symbol using navMap.showRouteDurationSymbol(true/false)

  • To clear the drawn route and markers using navMap.removeRoute() navMap.clearMarkers()

Start Navigation

  • Creates a NavLauncherConfig.Builder and configures the navigation settings, including the location layer render mode and whether to simulate the route.

  • The NavigationLauncher.startNavigation() method is called to start the navigation activity with the configured NavLauncherConfig.