FadeInImage throws null pointer exception (Flutter 3.3) #111011
Assignees
Labels
a: animation
Animation APIs
c: crash
Stack traces logged to the console
c: regression
It was better in the past than it is now
found in release: 3.3
Found to occur in 3.3
found in release: 3.4
Found to occur in 3.4
framework
flutter/packages/flutter repository. See also f: labels.
has reproducible steps
The issue has been confirmed reproducible and is ready to work on
r: fixed
Issue is closed as already fixed in a newer version
Comments
|
Issue is reproducible on the latest videoSimulator.Screen.Recording.-.iPhone.13.Pro.-.2022-09-06.at.08.17.54.mp4code sampleimport 'package:flutter/material.dart';
import 'dart:typed_data';
final Uint8List kTransparentImage = Uint8List.fromList(<int>[
0x89,
0x50,
0x4E,
0x47,
0x0D,
0x0A,
0x1A,
0x0A,
0x00,
0x00,
0x00,
0x0D,
0x49,
0x48,
0x44,
0x52,
0x00,
0x00,
0x00,
0x01,
0x00,
0x00,
0x00,
0x01,
0x08,
0x06,
0x00,
0x00,
0x00,
0x1F,
0x15,
0xC4,
0x89,
0x00,
0x00,
0x00,
0x0A,
0x49,
0x44,
0x41,
0x54,
0x78,
0x9C,
0x63,
0x00,
0x01,
0x00,
0x00,
0x05,
0x00,
0x01,
0x0D,
0x0A,
0x2D,
0xB4,
0x00,
0x00,
0x00,
0x00,
0x49,
0x45,
0x4E,
0x44,
0xAE,
]);
void main() async {
runApp(const MyApp());
}
const _kImages = [
'https://pub.dev/static/hash-t3bgi1vk/img/landing-01.webp',
'https://pub.dev/static/hash-t3bgi1vk/img/landing-02.webp',
'https://pub.dev/static/hash-t3bgi1vk/img/landing-03.webp',
];
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: FutureBuilder<void>(
// Preload the first image
future: precacheImage(NetworkImage(_kImages[0]), context),
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.waiting) {
return const Material(
child: Center(child: CircularProgressIndicator()));
}
return const MyHomePage(title: 'Flutter Demo Home Page');
}),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
FadeInImage.memoryNetwork(
placeholder: kTransparentImage,
image: _kImages[_counter % _kImages.length],
),
const Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
// Click the button to switch images
onPressed: _incrementCounter,
tooltip: 'Increment',
child: const Icon(Icons.add),
),
);
}
}
flutter doctor -vlogs |
|
cc: @werainkhatri |
8 tasks
|
This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of |
|
@chunhtai can you open a cherry-pick request using the standard template? Removing the cp: review label from this issue. |
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FadeInImage throws null pointer exception when switching from a cached image to an uncached image
It is possible that this PR is causing the problem.
Steps to Reproduce
flutter runon the code sampleExpected results:
Switch images normally.
Actual results:
Throwing exceptions:
Null check operator used on a null valueCode sample
demo_fade_in_image_null_3.zip
Logs
Full log
The text was updated successfully, but these errors were encountered: