Google place API for android to find city

I have seen the tutorial( tutorial ) to find the city using autocomplete text view in android.i have done everything that is instructed but now when i hit this url

it always throws me an exception saying : java.net.UnknownHostException: Unable to resolve host "maps.googleapis.com": No address associated with hostname

but the same url work fine when i hit through browser and i am getting the results also.

Here is the code i m hitting with :

public class PlacesAutoCompleteAdapter extends ArrayAdapter< String > implements Filterable{
 private ArrayList<String> resultList;
 private static final String LOG_TAG = "ExampleApp";

 private static final String PLACES_API_BASE = "https://maps.googleapis.com/maps/api/place";
 private static final String TYPE_AUTOCOMPLETE = "/autocomplete";
 private static final String OUT_JSON = "/json";

 private static final String API_KEY = "I have generated the correct api key also";


public PlacesAutoCompleteAdapter(Context context, int textViewResourceId) {
    super(context, textViewResourceId);

}


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

@Override
public String getItem(int index) {
    return resultList.get(index);
}

@Override
public Filter getFilter() {
    Filter filter = new Filter() {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
              FilterResults filterResults = new FilterResults();
                if (constraint != null) {
                    // Retrieve the autocomplete results.
                    resultList = autocomplete(constraint.toString());

                    // Assign the data to the FilterResults
                    filterResult