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);
curve = CurvedAnimation(
parent: controller,
curve: Curves.easeIn,
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: GestureDetector(
onDoubleTap: () {
if (controller.isCompleted) {
controller.reverse();
} else {
controller.forward();
}
},
child: RotationTransition(
turns: curve,
child: const FlutterLogo(
size: 200,
),
),
),
),
);
}
}<code_end>
<topic_end>
<topic_start>
Listviews & adapters
<topic_end>
<topic_start>
What is the alternative to a ListView in Flutter?
The equivalent to a ListView in Flutter is … a ListView!In an Android ListView, you create an adapter and pass it into the
ListView, which renders each row with what your adapter returns. However, you
have to make sure you recycle your rows, otherwise, you get all sorts of crazy
visual glitches and memory issues.Due to Flutter’s immutable widget pattern, you pass a list of
widgets to your ListView, and Flutter takes care of making sure
that scrolling is fast and smooth.
<code_start>import 'package:flutter/material.dart';
void main() {
runApp(const SampleApp());
}
class SampleApp extends StatelessWidget {
const SampleApp({super.key});
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Sample App',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
),
home: const SampleAppPage(),
);
}
}
class SampleAppPage extends StatefulWidget {
const SampleAppPage({super.key});
@override
State<SampleAppPage> createState() => _SampleAppPageState();
}
class _SampleAppPageState extends State<SampleAppPage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Sample App'),
),
body: ListView(children: _getListData()),
);
}
List<Widget> _getListData() {
List<Widget> widgets = [];
for (int i = 0; i < 100; i++) {
widgets.add(Padding(
padding: const EdgeInsets.all(10),
child: Text('Row $i'),
));
}
return widgets;
}
}<code_end>
<topic_end>
<topic_start>
How do I know which list item is clicked on?
In Android, the ListView has a method to find out which item was clicked,
‘onItemClickListener’.
In Flutter, use the touch handling provided by the passed-in widgets.
<code_start>import 'dart:developer' as developer;
import 'package:flutter/material.dart';
void main() {
runApp(const SampleApp());
}
class SampleApp extends StatelessWidget {
const SampleApp({super.key});
// This widget is the root of your application.
@override