getListViewItemDesc method
获取 listview 的 item 描述
Implementation
@override
String getListViewItemDesc(int index) {
String desc = super.getListViewItemDesc(index);
var allStr = desc.replaceAll("\\n", "\n").split("\n");
return allStr
.sublist(3, 10)
.reduce((value, element) => value + "\n" + element);
}