How to Draw Driving Directions with Google Maps API v2?

Drawing Driving Directions with Google Maps API v2

In this question, the user is attempting to draw driving directions between two geographical coordinates using Google Maps API v2. However, the code provided simply draws a straight line instead of the actual driving route.

To obtain the desired result, the user can utilize a library that interfaces with Google's Directions API. One such library is "Android-GoogleDirectionLibrary" (https://github.com/akexorcist/Android-GoogleDirectionLibrary). This library enables developers to easily fetch driving directions as JSON data, which can then be plotted as a polyline on the map.

To use this library, follow these steps:

1. Add the library to your Gradle build file:

   dependencies {
    ...
    implementation 'com.akexorcist:googledirectionlibrary:1.3.5'
    ...
   }

2. Initialize the Google Maps API and the Directions API client:

   <code class="java">// Initialize the Google Maps API
   GoogleMap mMap = ...
   
   // Initialize the Directions API client
   DirectionsClient directionsClient = Directions.newDirectionsClient(getApplicationContext());</code>

3. Specify the origin and destination coordinates:

   <code class="java">LatLng origin = new LatLng(12.917745600000000000, 77.623788300000000000);
   LatLng destination = new LatLng(12.842056800000000000, 7.663096499999940000);</code>

4. Create a Directions Request and execute it:

   <code class="java">DirectionsApiRequest request = new DirectionsApiRequest.Builder()
    .origin(origin)
    .destination(destination)
    .build();
   
   directionsClient.getDirectionsAsync(request, new DirectionListener() {
    @Override
    public void onDirectionRetrieved(DirectionsResult result) {
        // Handle the response from the Directions API
        PolylineOptions options = new PolylineOptions()
            .addAll(result.getRouteList().get(0).getOverviewPolyline().getDecodedPath());
   
        mMap.addPolyline(options);
    }
   
    @Override
    public void onDirectionFailed(DirectionException e) {
        // Handle any errors
    }
   });</code>

By utilizing this approach, the user can accurately draw driving directions between two points on the map, ensuring the route aligns with the actual roads.

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