scrollable_view_test.dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: ScrollTest(),
    );
  }
}

class ScrollTest extends StatefulWidget {
  @override
  _ScrollTestState createState() => _ScrollTestState();
}

class _ScrollTestState extends State<ScrollTest> {
  ScrollController _scrollController = ScrollController();

  @override
  void initState() {
    this._scrollController.addListener(() {
      print("Execute Listner..........");
    });
    super.initState();
  }

  @override
  void dispose() {
    this._scrollController?.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      physics: AlwaysScrollableScrollPhysics(),
      controller: _scrollController,
      itemCount: 1,
      itemBuilder: (context, position) {
        return Text("Hello Developer~ $position");
      },
    );
  }
}