Using WebView leads to size error in platform_views since Flutter 3.3.0 #111255
Description
Since the Flutter upgrade to 3.3.0 I am unable to use a WebView (neither flutter_webview nor third party packages like flutter_inappwebview) as it leads to an assertion error from TextureAndroidViewController.
I have a strong suspicion that it's caused by #101399.
This issue happens if parts of a Scaffold like the BottomNavigationBar have a varying height which is only known after a certain amount of time (asynchronously). This can be the case e. g. if menu items are loaded via an API.
Steps to Reproduce
- Paste the below code sample in a fresh Flutter 3.3.0 project
- Make sure to have a sufficient
minSdkVersion(I used23) - Execute
flutter runon the code sample with Flutter version of at least 3.0.0 - Wait 100 ms
- Realize that the WebView is not rendered and the terminal issues an error output
Expected results:
The WebView is rendered properly and the BottomNavigationBar is visible.
Actual results:
There is an error and neither the WebView nor the BottomNavigationBar is displayed.
Code sample
import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const Scaffold(
body: WebView(
initialUrl: 'https://flutter.dev',
),
bottomNavigationBar: BottomNavigationExample(),
),
);
}
}
class BottomNavigationExample extends StatefulWidget {
const BottomNavigationExample({
Key? key,
}) : super(key: key);
@override
State<BottomNavigationExample> createState() =>
_BottomNavigationExampleState();
}
class _BottomNavigationExampleState extends State<BottomNavigationExample> {
@override
void initState() {
super.initState();
}
@override
Widget build(BuildContext context) {
return FutureBuilder(
future: Future.delayed(const Duration(milliseconds: 100)),
builder: (context, snapshot) {
if (!snapshot.hasData) {
return Container();
}
return BottomNavigationBar(
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(icon: Icon(Icons.add), label: 'Test1'),
BottomNavigationBarItem(icon: Icon(Icons.add), label: 'Test2'),
],
);
},
);
}
}
Logs
I/flutter (19778): ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
I/flutter (19778): │ #0 _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:51:61)
I/flutter (19778): │ #1 _AssertionError._throwNew (dart:core-patch/errors_patch.dart:40:5)
I/flutter (19778): │ #2 TextureAndroidViewController._sendCreateMessage (package:flutter/src/services/platform_views.dart:1129:12)
I/flutter (19778): │ #3 AndroidViewController.create (package:flutter/src/services/platform_views.dart:792:11)
I/flutter (19778): │ #4 _PlatformViewLinkState.build.<anonymous closure> (package:flutter/src/widgets/platform_view.dart:876:22)
I/flutter (19778): │ #5 _PlatformViewPlaceholderBox.performLayout (package:flutter/src/widgets/platform_view.dart:1115:13)
I/flutter (19778): │ #6 RenderObject.layout (package:flutter/src/rendering/object.dart:2135:7)
I/flutter (19778): │ #7 RenderBox.layout (package:flutter/src/rendering/box.dart:2418:11)
I/flutter (19778): ├┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄
I/flutter (19778): │ ⛔ [null] 'package:flutter/src/services/platform_views.dart': Failed assertion: line 1129 pos 12: '!size.isEmpty': trying to create TextureAndroidViewController without setting a valid size.
Analyzing test-app...
No issues found! (ran in 8.1s)
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High-priority issues at the top of the work listStack traces logged to the consoleIt was better in the past than it is nowFound to occur in 3.3Found to occur in 3.4flutter/packages/flutter repository. See also f: labels.The issue has been confirmed reproducible and is ready to work onAndroid applications specificallyIssue is closed as already fixed in a newer version