Case: 01069114

app.js

function initUI() {
    const appWindow = Ti.UI.createWindow();
    const listView = createListViewWithLazyLoad(40, 15, 1);
    activityIndicator = Ti.UI.createActivityIndicator({
        bottom: 10,
        color: 'red',
        zIndex: 1000,
        style: Ti.UI.ActivityIndicatorStyle.DARK
    });
 
    appWindow.add(listView);
    appWindow.add(activityIndicator);
    appWindow.open();
}
 
function createListViewWithLazyLoad(initialSize, batchSize, threshold) {
    const listSection = Ti.UI.createListSection();
    
    initSectionWithItems(listSection, initialSize);
    
    const listView = Ti.UI.createListView({
        sections: [ listSection ],
    });
 
    updateMarker(listView, threshold);
 
    listView.addEventListener('marker', evt => {
        activityIndicator.show();
        appendNextBatch(listSection, batchSize);
        updateMarker(listView, threshold);
    });
 
listView.addEventListener('scrollend', function(e){
        activityIndicator.hide();
});
    return listView;
}
 
function initSectionWithItems(listSection, size) {
    let items = [];
 
    for (let i = 0; i < size; i++) {
        const item = {
            properties: {
                title: `Item #${i}`
            }
        };
 
        items.push(item);
    }
 
    listSection.items = items;
}
 
function updateMarker(listView, threshold) {
    const { 
        sections: [
            {
                items: {
                    length
                }
            }
        ] 
    } = listView;
 
    const itemIndex = length - threshold;
 
    listView.setMarker({
        itemIndex,
        sectionIndex: 0
    });
}
 
function appendNextBatch(listSection, batchSize) {
     let items = [];
     const { items: { length } } = listSection;
 
    for (let i = 0; i < batchSize; i++) {
        const item = {
            properties: {
                title: `Item #${length + i}`
            }
        };
 
        items.push(item);
    }
 
    listSection.appendItems(items, {
        animated: false
    });
}
 
var  activityIndicator;
initUI();