GeoDataApi.getAutocompletePredictions not working

I am building an android application that shows autocomplete feature and fetches autocomplete predictions in google maps using - GeoDataApi.getAutocompletePredictions. I followed this tutorial - https://github.com/googlesamples/android-play-places/blob/master/PlaceComplete/Application/src/main/java/com/example/google/playservices/placecomplete/PlaceAutocompleteAdapter.java

But somehow this is not working fine for me.

My class is this -

public class GooglePlacesAutoCompleteAdapter extends ArrayAdapter implements Filterable {

    private ArrayList<PlaceAutocomplete> mResultList;
    GoogleApiClient mGoogleApiClient;
    private LatLngBounds mBounds;
    private AutocompleteFilter mPlaceFilter;
    int radius = 500;

    public GooglePlacesAutoCompleteAdapter(Context context, int textViewResourceId, GoogleApiClient googleApiClient,
                                           Location lastLocation, AutocompleteFilter filter) {
        super(context, textViewResourceId);
        LatLng currentLatLng = new LatLng(lastLocation.getLatitude(), lastLocation.getLongitude());
        mBounds = Utility.boundsWithCenterAndLatLngDistance(currentLatLng, 500, 500);
        mGoogleApiClient = googleApiClient;
        mPlaceFilter = filter;
    }

    @Override
    public int getCount() {
        return mResultList.size();
    }

    @Override
    public PlaceAutocomplete getItem(int index) {
        return mResultList.get(index);
    }

    @Override
    public android.widget.Filter getFilter() {
        Filter filter = new Filter() {
            @Override
            public FilterResults performFiltering(CharSequence constraint) {
                FilterResults filterResults = new FilterResults();
                if (constraint != null && constraint.length() > 3 && constraint.length()%3 == 1) {
                    // Retrieve the autocomplete results.
                    mResultList = autocomplete(constraint.toString());

                    // Assign the data to the FilterResults
                    filterResults.values = mResultList;
                    filterResults.count = mResultList.size();
                }
                return filterResults;
            }

            @Override
            public void publishResults(CharSequence constraint, FilterResults results) {
                if (results != null && results.count > 0) {
                    notifyDataSetChanged();
                } else {
                    notifyDataSetInvalidated();
                }
            }
        };
        return filter;
    }


    public ArrayList<PlaceAutocomplete> autocomplete(String input) {

        if (mGoogleApiClient.isConnected()) {

            // Submit the query to the autocomplete API and retrieve a PendingResult that will
            // contain the results when the query completes.
            PendingResult results = Places.GeoDataApi.getAutocompletePredictions(mGoogleApiClient, input.toString(),
                    mBounds, mPlaceFilter);

            // This method should have been called off the main UI thread. Block and wait for at most 60s
            // for a result from the API.

            AutocompletePredictionBuffer autocompletePredictions = (AutocompletePredictionBuffer)results.await(60, TimeUnit.SECONDS);

            // Confirm that the query completed successfully, otherwise return null
            final Status status = autocompletePredictions.getStatus();
            if (!status.isSuccess()) {
                //Toast.makeText(getContext(), "Error contacting API: " + status.toString(),Toast.LENGTH_SHORT).show();
                //Log.e(TAG, "Error getting autocomplete prediction API call: " + status.toString());
                autocompletePredictions.release();
                return null;
            }

            // Copy the results into our own data structure, because we can't hold onto the buffer.
            // AutocompletePrediction objects encapsulate the API response (place ID and description).

            Iterator<AutocompletePrediction> iterator = autocompletePredictions.iterator();
            ArrayList resultList = new ArrayList<>(autocompletePredictions.getCount());
            while (iterator.hasNext()) {
                AutocompletePrediction prediction = iterator.next();
                // Get the details of this prediction and copy it into a new PlaceAutocomplete object.
                resultList.add(new PlaceAutocomplete(prediction.getPlaceId(), prediction.getDescription()));
            }

            // Release the buffer now that all data has been copied.
            autocompletePredictions.release();

            return resultList;
        }
        //Log.e(TAG, "Google API client is not connected for autocomplete query.");
        return null;

    }

    class PlaceAutocomplete {
        public CharSequence placeId;
        public CharSequence description;

        PlaceAutocomplete(CharSequence placeId, CharSequence description) {
            this.placeId = placeId;
            this.description = description;
        }

        @Override
        public String toString() {
            return description.toString();
        }
    }
}

The line on which GeoDataApi.getAutocompletePredictions is called, goes into an internal classes called - Filter.java, Log.java, handler.java and then Looper.java and loops there indefinetly on line 121 of Looper.java (I am sure studio sdk will show the code for Looper.java).

It is not even throwing an error, or going to the next line, it just does not work. Plus, I am not able to see the stack trace of an error.

This is the code snippet which is calling this -

if (mLastLocation != null) {
           GooglePlacesAutoCompleteAdapter placesAdapter = new GooglePlacesAutoCompleteAdapter(this, R.layout.item_list, mGoogleApiClient, mLastLocation, null);
            autoCompView.setAdapter(placesAdapter);
            autoCompView.setOnItemClickListener(this);
        }

Can someone please tell me what I am doing wrong here? Please any help will be greatly appreciated. I need to get this working as soon as I could.

PS - I am passing mPlaceFilter as null here.

Enable the Google Places API for Android in developers console