To display routes between multiple markers in Google Maps API for Android, you can use the Directions API to obtain the route information and then draw the route on the map using polylines. Here's a step-by-step guide on how to achieve this:

Step 1: Set up your Android project with Google Maps API.

  • Ensure you have the necessary dependencies and permissions for using Google Maps API in your Android project.

Step 2: Obtain an API Key from the Google Cloud Console.

  • You'll need an API Key to access the Google Maps API services, including the Directions API.

Step 3: Add markers to your map.

  • Add multiple markers on the map representing the locations you want to connect with a route.

Step 4: Get route information using the Directions API.

  • Make an HTTP request to the Directions API to get the route information between the markers. You can use the OkHttp library for this purpose.

Step 5: Parse the route information.

  • Parse the JSON response received from the Directions API to extract the necessary information such as polyline points.

Step 6: Draw the route on the map.

  • Use polylines to draw the route on the map using the polyline points obtained from the Directions API.

Here's a simplified code example for the main steps mentioned above:

java
// Step 1 and 2: Set up your Android project and obtain an API Key // Step 3: Add markers to the map // Assuming you have LatLng objects for the marker positions LatLng marker1 = new LatLng(40.712776, -74.005974); // New York City LatLng marker2 = new LatLng(34.052235, -118.243683); // Los Angeles // Step 4: Get route information using the Directions API // Make an HTTP request to the Directions API and parse the JSON response to get polyline points // Step 5: Parse the route information // Assuming you have obtained a List<LatLng> called "polylinePoints" with the polyline points // Step 6: Draw the route on the map PolylineOptions polylineOptions = new PolylineOptions() .addAll(polylinePoints) .width(10) .color(Color.BLUE); map.addPolyline(polylineOptions);

Please note that this is a simplified example, and in a real-world application, you would need to handle error cases, asynchronous requests, and more. Additionally, you need to use the appropriate libraries to make HTTP requests and parse JSON data (e.g., OkHttp and Gson). Also, ensure that you have the necessary permissions in your AndroidManifest.xml to access the internet for making API requests.

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