Launch NavigationView

A complete turn-by-turn experience using the default NavigationLauncher

This example shows how to launch Navigation using NavigationLauncher

How to fetch a route using NBNavigation.fetchRoute with origin and destination
How to config NavLauncherConfig and launch Navigation using NavigationLauncher with the given route

For all code examples, refer to Navigation Code Examples

activity_main.xml view source

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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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    android:layout_width="match_parent"
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    android:layout_height="match_parent"
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    android:orientation="vertical"
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    android:padding="10dp">
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    <LinearLayout
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        android:layout_width="wrap_content"
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        android:layout_height="wrap_content">
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        <Button
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            android:id="@+id/fetchRoute"
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            android:layout_width="wrap_content"
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            android:layout_height="wrap_content"
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            android:text="@string/fetch_route"/>
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        <Button
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            android:id="@+id/startNav"
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            android:layout_width="wrap_content"
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            android:layout_height="wrap_content"
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            android:layout_marginLeft="15dp"
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            android:text="@string/start_navigation"/>
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    </LinearLayout>
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    <TextView
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        android:id="@+id/routeGeometry"
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        android:layout_width="wrap_content"
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        android:layout_height="wrap_content"
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        android:layout_marginTop="10dp"/>
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    <ProgressBar
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        android:id="@+id/progress"
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        android:visibility="gone"
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        android:layout_width="wrap_content"
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        android:layout_height="wrap_content"
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        android:layout_gravity="center"/>
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</LinearLayout>

NavigationActivity view source

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package ai.nextbillion.navigation.demo.activity;
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import android.os.Bundle;
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import android.view.View;
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import android.widget.Button;
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import android.widget.ProgressBar;
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import android.widget.TextView;
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import ai.nextbillion.kits.directions.models.DirectionsResponse;
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import ai.nextbillion.kits.directions.models.DirectionsRoute;
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import ai.nextbillion.kits.geojson.Point;
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import ai.nextbillion.maps.location.modes.RenderMode;
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import ai.nextbillion.navigation.demo.R;
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import ai.nextbillion.navigation.ui.NBNavigation;
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import ai.nextbillion.navigation.ui.NavLauncherConfig;
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import ai.nextbillion.navigation.ui.NavigationLauncher;
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import androidx.annotation.NonNull;
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import androidx.appcompat.app.AppCompatActivity;
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import retrofit2.Call;
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import retrofit2.Callback;
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import retrofit2.Response;
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public class NavigationActivity extends AppCompatActivity implements View.OnClickListener {
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    private Button fetchRoute;
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    private Button startNav;
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    private TextView routeGeometry;
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    private DirectionsRoute directionsRoute;
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    private ProgressBar progress;
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    @Override
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    protected void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        setContentView(R.layout.activity_main);
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        fetchRoute = findViewById(R.id.fetchRoute);
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        startNav = findViewById(R.id.startNav);
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        routeGeometry = findViewById(R.id.routeGeometry);
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        progress = findViewById(R.id.progress);
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        fetchRoute.setOnClickListener(this);
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        startNav.setOnClickListener(this);
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        startNav.setEnabled(false);
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    }
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    @Override
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    public void onClick(View view) {
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        if (view.getId() == R.id.fetchRoute) {
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            progress.setVisibility(View.VISIBLE);
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            Point origin = Point.fromLngLat(103.75986708439264, 1.312533169133601);
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            Point destination = Point.fromLngLat(103.77982271935586, 1.310473772283314);
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            NBNavigation.fetchRoute(origin, destination, new Callback<DirectionsResponse>() {
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                @Override
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                public void onResponse(@NonNull Call<DirectionsResponse> call, @NonNull Response<DirectionsResponse> response) {
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                    progress.setVisibility(View.GONE);
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                    //start navigation with the route we just fetched.
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                    if (response.body() != null && !response.body().routes().isEmpty()) {
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                        directionsRoute = response.body().routes().get(0);
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                        routeGeometry.setText(String.format("Route Geometry: %s", directionsRoute.geometry()));
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                        startNav.setEnabled(true);
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                    }
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                }
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                @Override
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                public void onFailure(@NonNull Call<DirectionsResponse> call, @NonNull Throwable t) {
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                    progress.setVisibility(View.GONE);
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                }
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            });
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        } else if (view.getId() == R.id.startNav) {
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            NavLauncherConfig.Builder configBuilder = NavLauncherConfig.builder(directionsRoute);
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            configBuilder.locationLayerRenderMode(RenderMode.GPS);
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            configBuilder.shouldSimulateRoute(true);
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            NavigationLauncher.startNavigation(NavigationActivity.this, configBuilder.build());
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        }
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    }
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}

Code Highlights

The example code represents a NavigationActivity class that allows users to fetch a route and start navigation using the NavigationLauncher class provided by the navigation SDK. Code Explanation The code example defines a layout file activity_main.xml that contains a vertical LinearLayout with two Button views (fetchRoute and startNav), a TextView (routeGeometry), and a ProgressBar (progress).

The associated Java class NavigationActivity extends AppCompatActivity and implements the OnClickListener interface. In the onCreate method, the layout elements are initialized and click listeners are set for the buttons.

When the fetchRoute button is clicked, a network request is made using the NBNavigation class to fetch a route between two geographic points (origin and destination). The response is received asynchronously in the onResponse callback. If the response is successful and contains at least one route, the first route is stored in the directionsRoute variable, and its geometry is displayed in the routeGeometry text view. The startNav button is enabled to allow navigation to be started.

When the startNav button is clicked, a NavLauncherConfig is created with the stored directionsRoute and some configuration options. The navigation is then started using the NavigationLauncher.startNavigation method.

Code summary

Fetch a route
- Using the NBNavigation.fetchRoute method to retrieve the directions response for the given origin and destination points. If the response is successful and it will contain at least one route
Start navigation
- NavLauncherConfig object is created with the previously fetched route and additional configuration options such as location layer render mode and route simulation. The NavigationLauncher.startNavigation method is called to start the navigation activity with the provided configuration.