This method demonstrates the programmatic approach to getting place predictions.

autocomplete.java

*
* This method demonstrates the programmatic approach to getting place predictions.
* The parameters in this request are currently biased to Kolkata, India.
*
* @param query the plus code query string (e.g. "GCG2+3M K")
*/
private void getPlacePredictions(String query) {
   // The value of `locationBias` biases prediction results to the rectangular
   // region provided (currently Kolkata). Modify these values to get results
   // to another area. Make sure to pass in the appropriate value/s for
   // .setCountries() as in the FindAutocompletePredictionsRequest.Builder
   // object as well.
   LocationBias locationBias = RectangularBounds.newInstance(
       new LatLng(22.458744, 88.208162),
       new LatLng(22.730671, 88.524896));

   // Create a new programmatic Place Autocomplete request in Places SDK for Android
   FindAutocompletePredictionsRequest newRequest = FindAutocompletePredictionsRequest.builder()
       .setLocationBias(locationBias)
       .setQuery(query)
       .setTypeFilter(TypeFilter.ESTABLISHMENT)
       .setCountries("IN")
       .build();

   // Perform autocomplete predictions request
   placesClient.findAutocompletePredictions(newRequest).addOnSuccessListener((response) -> {
       List<AutocompletePrediction> predictions = response.getAutocompletePredictions();
       if (predictions.isEmpty()) {
           Log.w(TAG, "No predictions found");
           return;
       }

       // Perform Geocoding API request from 1st prediction match
       AutocompletePrediction firstPrediction = predictions.get(0);
       geocodePlace(firstPrediction.getPlaceId());
   }).addOnFailureListener((exception) -> {
       if (exception instanceof ApiException) {
           ApiException apiException = (ApiException) exception;
           Log.e(TAG, "Place not found: " + apiException.getStatusCode());
       }
   });
}

// The Volley dispatch queue for network requests. Initialized with an Android Context object
RequestQueue queue;

/**
* Performs a Geocode API request
*
* @param placeID the ID of the Place to geocode
*/
private void geocodePlace(String placeID) {
   // Construct the request URL
   String apiKey = ""; // Your GMP API key
   String url = "https://maps.googleapis.com/maps/api/geocode/json?place_id=%s&key=%s";
   String requestURL = String.format(url, placeID, apiKey);

   // Use the HTTP request URL for Geocoding API to get geographic coordinates for the place
   JsonObjectRequest request = new JsonObjectRequest(Method.GET, requestURL, null,
       response -> {
           try {
               // Inspect the value of "results" and make sure it's not empty
               JSONArray results = response.getJSONArray("results");
               if (results.length() == 0) {
                   Log.w(TAG, "No results from geocoding request.");
                   return;
               }

               // Use Gson to convert the response JSON object to a POJO
               GeocodingResult result = new Gson()
                   .fromJson(results.getString(0), GeocodingResult.class);
               LatLng latLng = result.geometry.location;
               Log.d(TAG, "LatLng for geocoded place: " + latLng);
           } catch (JSONException e) {
               e.printStackTrace();
           }
       }, error -> Log.e(TAG, "Request failed"));

   // Add the request to the Request queue.
   queue.add(request);
}