Implement infinite scrolling in a Flutter app to handle.

How to Implement Infinite Scrolling in Flutter

Introduction

Infinite scrolling is a common feature in apps that fetch and display large sets of data. It allows users to scroll seamlessly while data is loaded in chunks as they approach the end of the list. Here's how you can implement it in Flutter.

Steps to Implement Infinite Scrolling

1. Key Concepts

• Pagination: Fetch a limited number of items per API call.
• Lazy Loading: Load additional data as the user scrolls near the bottom.
• State Management: Maintain the list of items and loading state.

2. Implementation Steps

1. Setup State Variables: Manage the list of items, current page index, and loading state using state management solutions like StatefulWidget or Provider.
2. Fetch Paginated Data: Create a function to fetch data from the API, passing the current page index as a parameter.
3. Detect Scrolling: Use a ScrollController to detect when the user scrolls to the bottom of the list.
4. Add Loading Indicators: Display a loading spinner at the bottom of the list when more data is being fetched.

3. Example Code

import 'package:flutter/material.dart';

class InfiniteScrollPage extends StatefulWidget {
  @override
  _InfiniteScrollPageState createState() => _InfiniteScrollPageState();
}

class _InfiniteScrollPageState extends State<InfiniteScrollPage> {
  final ScrollController _scrollController = ScrollController();
  List<String> _items = [];
  int _currentPage = 1;
  bool _isLoading = false;
  bool _hasMore = true;

  @override
  void initState() {
    super.initState();
    _fetchData();
    _scrollController.addListener(() {
      if (_scrollController.position.pixels ==
              _scrollController.position.maxScrollExtent &&
          !_isLoading &&
          _hasMore) {
        _fetchData();
      }
    });
  }

  Future<void> _fetchData() async {
    setState(() => _isLoading = true);
    try {
      // Simulating an API call with a delay
      await Future.delayed(Duration(seconds: 2));
      List<String> fetchedData =