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class SliverListBldr extends StatelessWidget {
  const SliverListBldr({
    Key? key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return SliverList(
      delegate: SliverChildBuilderDelegate(
        (BuildContext context, int index) {

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class SliverSearch extends StatelessWidget {
  const SliverSearch({
    Key? key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return SliverAppBar(
      backgroundColor: Theme.of(context).scaffoldBackgroundColor,
      elevation: 0,

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class SliverAppBarBldr extends StatelessWidget {
  const SliverAppBarBldr({
    Key? key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return SliverAppBar(
      backgroundColor: Theme.of(context).scaffoldBackgroundColor,
      elevation: 0,

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return const Scaffold(
      body: CustomScrollView(
        slivers: [
          SliverAppBarBldr(), // <- corresponds to the top most image
          SliverSearch(), // <- corresponds to search bar widget
          SliverListBldr(), //  <- corresponds to the body lists containers
        ],
      ),
    );

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  Future<void> addStudents() async {
    //creates a new doc with unique doc ID
    return collectionRef
        .add({
          'Name': "TestName",
        })
        .then((value) => debugPrint("User Added"))
        .catchError((error) => debugPrint("Failed to add user: $error"));
  }

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class FireStoreDataBase {
  final CollectionReference collectionRef =
      FirebaseFirestore.instance.collection("Students");

   Future getData() async {
    try {
      //to get data from a single/particular document alone.
      var temp = await collectionRef.doc("<your document ID here>").get(); 
      return temp;
    } catch (e) {

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  setBadgeNum(int count, BuildContext context) async {
    try {
      await FlutterDynamicIcon.setApplicationIconBadgeNumber(count);
    } on PlatformException {
      print('Exception: Platform not supported');
    } catch (e) {
      print(e);
    }
    // To get currently badge number that was set.
    int badgeNumber = await FlutterDynamicIcon.getApplicationIconBadgeNumber();

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  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: buildAppBar(appBarTitle: title),
      body: Center(
        child: ElevatedButton(
          style: getBtnStyle(context),
          child: const Text('Set badge no'),
          onPressed: () => setBadgeNum(5, context),
        ),

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  changeAppIcon() async {
    try {
      if (await FlutterDynamicIcon.supportsAlternateIcons) {
        await FlutterDynamicIcon.setAlternateIconName(iconName[iconIndex]);
        debugPrint("App icon change successful");
        return;
      }
    } catch (e) {
      debugPrint("Exception: ${e.toString()}");
    }

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import 'package:flutter/material.dart';

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}