ListView Builder scrolling is slow due to improper input events handling #22314
Description
The ListView Builder is slow compared to native apps. I've attached a video demo-ing my experience. And my complete code (which is basically just the example on the Working with long lists guide.
The gif has the flutter listview and also shows the scrolling of Reddit Is Fun app as well just for a reference.
main.dart
import 'package:flutter/material.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
home: Scaffold(
body: ListView.builder(
key: Key("lvbuildertest"),
itemCount: 200,
itemBuilder: (context, index) {
return ListTile(title: Text("index: $index"));
}),
),
);
}
}
[√] Flutter (Channel master, v0.9.4-pre.31, on Microsoft Windows [Version 10.0.17134.285], locale en-GB)
• Flutter version 0.9.4-pre.31 at F:\androidsdk\flutter
• Framework revision 52697ef962 (11 hours ago), 2018-09-26 07:57:05 +0200
• Engine revision 38a646e14c
• Dart version 2.1.0-dev.5.0.flutter-4cf2d3990b
[√] Android toolchain - develop for Android devices (Android SDK 28.0.2)
• Android SDK at F:\androidsdk
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• Platform android-28, build-tools 28.0.2
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)
• All Android licenses accepted.
[√] Android Studio (version 3.1)
• Android Studio at C:\Program Files\Android\Android Studio
X Flutter plugin not installed; this adds Flutter specific functionality.
X Dart plugin not installed; this adds Dart specific functionality.
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)
[!] IntelliJ IDEA Ultimate Edition (version 2018.1)
• IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA 2018.1.5
X Flutter plugin not installed; this adds Flutter specific functionality.
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• For information about installing plugins, see
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[√] VS Code (version 1.27.2)
• VS Code at C:\Users\username
\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 2.18.0
[√] Connected devices (1 available)
• SM N9005 • 192.168.0.3:5555 • android-arm • Android 8.1.0 (API 27)
! Doctor found issues in 1 category.