Fetch routes and Draw route lines on a map

This example shows how to fetch routes using RouteFetcher and draw route lines on the map view

  • How to initialize a mapView and bind it to the activity lifecycle

  • How to fetch routes using RouteFetcher

  • Draw a route line using navMap.drawRoute(route)

  • Config to show or hide route duration symbol using navMap.showRouteDurationSymbol(boolean)

  • How to Frame Map Camera using the given route

docs-image

For all code examples, refer to Navigation Code Examples

activity_draw_route_line.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 tools:context=".activity.DrawRouteLineActivity">
8
9 <ai.nextbillion.maps.core.MapView
10 android:id="@+id/mapView"
11 android:layout_width="match_parent"
12 android:layout_height="match_parent"
13 app:nbmap_uiAttribution="false">
14 </ai.nextbillion.maps.core.MapView>
15
16 <LinearLayout
17 android:layout_width="wrap_content"
18 android:layout_height="wrap_content"
19 android:paddingLeft="10dp"
20 android:orientation="vertical"
21 android:layout_gravity="bottom">
22 <Button
23 android:id="@+id/fetchRoute"
24 android:layout_width="wrap_content"
25 android:layout_height="wrap_content"
26 android:textSize="12sp"
27 android:text="@string/draw_route"/>
28
29 <Button
30 android:id="@+id/hideRouteDuration"
31 android:layout_width="wrap_content"
32 android:layout_height="wrap_content"
33 android:textSize="12sp"
34 android:text="@string/draw_route_without"/>
35
36 <Button
37 android:id="@+id/startNav"
38 android:layout_width="wrap_content"
39 android:layout_height="wrap_content"
40 android:textSize="12sp"
41 android:text="@string/start_navigation"/>
42
43 </LinearLayout>
44
45 <ProgressBar
46 android:id="@+id/progress"
47 android:visibility="gone"
48 android:layout_width="wrap_content"
49 android:layout_height="wrap_content"
50 android:layout_gravity="center"/>
51</FrameLayout>

DrawRouteLineActivity 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 DrawRouteLineActivity extends AppCompatActivity implements OnMapReadyCallback, View.OnClickListener {
36
37 private static final double DEFAULT_CAMERA_ZOOM = 14;
38
39 private Point origin = Point.fromLngLat(103.75986708439264, 1.312533169133601);
40 private Point destination = Point.fromLngLat(103.77982271935586, 1.310473772283314);
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);
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.locationLayerRenderMode(RenderMode.GPS);
96 configBuilder.shouldSimulateRoute(true);
97 NavigationLauncher.startNavigation(DrawRouteLineActivity.this, configBuilder.build());
98 }
99 }
100
101 private void fetchRoute() {
102 progress.setVisibility(View.VISIBLE);
103
104 RouteRequestParams.Builder builder = RouteRequestParams.builder()
105 .origin(origin)
106 .destination(destination)
107 .language("en")
108 .departureTime((int) (System.currentTimeMillis()/1000));
109
110 RouteFetcher.getRoute(builder.build(), new Callback<DirectionsResponse>() {
111 @Override
112 public void onResponse(Call<DirectionsResponse> call, Response<DirectionsResponse> response) {
113 progress.setVisibility(View.GONE);
114 //start navigation with the route we just fetched.
115 if (response.body() != null && !response.body().routes().isEmpty()) {
116 directionsRoute = response.body().routes().get(0);
117 directionsRoutes = response.body().routes();
118 drawRouteLine();
119 startNav.setEnabled(true);
120 }
121 }
122
123 @Override
124 public void onFailure(Call<DirectionsResponse> call, Throwable t) {
125 progress.setVisibility(View.GONE);
126 }
127 });
128 }
129
130 private void drawRouteLine() {
131 navMap.removeRoute();
132 navMap.clearMarkers();
133 navMap.showRouteDurationSymbol(showRouteDurationSymbol);
134 navMap.drawRoute(directionsRoute);
135 frameCameraToRoute();
136 }
137
138 private void frameCameraToRoute() {
139 int[] padding = CameraAnimateUtils.createPadding(this);
140 CameraAnimateUtils.frameCameraToBounds(navMap, directionsRoutes, padding);
141 }
142
143 @Override
144 protected void onStart() {
145 super.onStart();
146 mapView.onStart();
147 }
148
149 @Override
150 protected void onResume() {
151 super.onResume();
152 mapView.onResume();
153 }
154
155 @Override
156 protected void onPause() {
157 super.onPause();
158 mapView.onPause();
159 }
160
161 @Override
162 public void onLowMemory() {
163 super.onLowMemory();
164 mapView.onLowMemory();
165 }
166
167 @Override
168 protected void onStop() {
169 super.onStop();
170 mapView.onStop();
171 }
172
173 @Override
174 protected void onDestroy() {
175 mapView.onDestroy();
176 super.onDestroy();
177 }
178
179 @Override
180 protected void onSaveInstanceState(@NonNull Bundle outState) {
181 super.onSaveInstanceState(outState);
182 mapView.onSaveInstanceState(outState);
183 }
184
185}

Code Highlights

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

In particular, this example code shows the code logic of displaying or hiding route duration symbol via navMap.showRouteDurationSymbol() function. We could customize the logic based on needs.

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, and 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.drawRoute()

  • 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.