public class AutoCompleteTextField

Form hi = new Form("Auto Complete", new BoxLayout(BoxLayout.Y_AXIS));
AutoCompleteTextField ac = new AutoCompleteTextField("Short", "Shock", "Sholder", "Shrek");
ac.setMinimumElementsShownInPopup(5);
hi.add(ac);

public void showForm() {
  final DefaultListModel options = new DefaultListModel<>();
  AutoCompleteTextField ac = new AutoCompleteTextField(options) {
@Override
      protected boolean filter(String text) {
          if(text.length() == 0) {
              return false;
          }
          String[] l = searchLocations(text);
          if(l == null || l.length == 0) {
              return false;
          }

          options.removeAll();
          for(String s : l) {
              options.addItem(s);
          }
          return true;
      }

  };
  ac.setMinimumElementsShownInPopup(5);
  hi.add(ac);
  hi.add(new SpanLabel("This demo requires a valid google API key to be set below "
           + "you can get this key for the webservice (not the native key) by following the instructions here: "
           + "https://developers.google.com/places/web-service/get-api-key"));
  hi.add(apiKey);
  hi.getToolbar().addCommandToRightBar("Get Key", null, e -> Display.getInstance().execute("https://developers.google.com/places/web-service/get-api-key"));
  hi.show();
}

TextField apiKey = new TextField();

String[] searchLocations(String text) {
    try {
        if(text.length() > 0) {
            ConnectionRequest r = new ConnectionRequest();
            r.setPost(false);
            r.setUrl("https://maps.googleapis.com/maps/api/place/autocomplete/json");
            r.addArgument("key", apiKey.getText());
            r.addArgument("input", text);
            NetworkManager.getInstance().addToQueueAndWait(r);
            Map result = new JSONParser().parseJSON(new InputStreamReader(new ByteArrayInputStream(r.getResponseData()), "UTF-8"));
            String[] res = Result.fromContent(result).getAsStringArray("//description");
            return res;
        }
    } catch(Exception err) {
        Log.e(err);
    }
    return null;
}