Sample Usage of InfiniteScrollAdapter from Codename One fetches data dynamically from a webservice to scroll down infinitely

InfiniteScrollAdapterSample.java

public void showForm() {
    Form hi = new Form("InfiniteScrollAdapter", new BoxLayout(BoxLayout.Y_AXIS));
    
    Style s = UIManager.getInstance().getComponentStyle("MultiLine1");
    FontImage p = FontImage.createMaterial(FontImage.MATERIAL_PORTRAIT, s);
    EncodedImage placeholder = EncodedImage.createFromImage(p.scaled(p.getWidth() * 3, p.getHeight() * 3), false); 
    
    InfiniteScrollAdapter.createInfiniteScroll(hi.getContentPane(), () -> { 
        java.util.List<Map<String, Object>> data = fetchPropertyData("Leeds"); 
        MultiButton[] cmps = new MultiButton[data.size()];
        for(int iter = 0 ; iter < cmps.length ; iter++) {
            Map<String, Object> currentListing = data.get(iter);
            if(currentListing == null) { 
                InfiniteScrollAdapter.addMoreComponents(hi.getContentPane(), new Component[0], false);
                return;
            }
            String thumb_url = (String)currentListing.get("thumb_url");
            String guid = (String)currentListing.get("guid");
            String summary = (String)currentListing.get("summary");
            cmps[iter] = new MultiButton(summary);
            cmps[iter].setIcon(URLImage.createToStorage(placeholder, guid, thumb_url));
        }
        InfiniteScrollAdapter.addMoreComponents(hi.getContentPane(), cmps, true);
    }, true); 
    hi.show();
}
int pageNumber = 1;
java.util.List<Map<String, Object>> fetchPropertyData(String text) {
    try {
        ConnectionRequest r = new ConnectionRequest();
        r.setPost(false);
        r.setUrl("http://api.nestoria.co.uk/api");
        r.addArgument("pretty", "0");
        r.addArgument("action", "search_listings");
        r.addArgument("encoding", "json");
        r.addArgument("listing_type", "buy");
        r.addArgument("page", "" + pageNumber);
        pageNumber++;
        r.addArgument("country", "uk");
        r.addArgument("place_name", text);
        NetworkManager.getInstance().addToQueueAndWait(r);
        Map<String,Object> result = new JSONParser().parseJSON(new InputStreamReader(new ByteArrayInputStream(r.getResponseData()), "UTF-8"));
        Map<String, Object> response = (Map<String, Object>)result.get("response");
        return (java.util.List<Map<String, Object>>)response.get("listings");
    } catch(Exception err) {
        Log.e(err);
        return null;
    }
}

Sample usage code for InfiniteScrollAdapter.

From the Codename One project