PlatformView (AndroidView and UIKitView) does not constrain painted content even when parent object provides bounded layout constraints

[sjschultze]

Steps to Reproduce

1. Create a ConstrainedBox containing an AndroidView (or UIKitView)
2. Painted content from AndroidView is not constrained or clipped
   Code to reproduce: https://github.com/sjschultze/example_zoom_app_boundedwidget/blob/3d222ea4d349c3bb4b82562f7f67d1adf433b357/lib/meeting_screen.dart#L64

Expected results:

1. AndroidView content is constrained and scaled; or
2. AndroidView content is constrained and clipped

Actual results: AndroidView takes up the full screen because the Android code seeks to use the full screen

According to the documentation:

https://api.flutter.dev/flutter/widgets/AndroidView-class.html
"The widget fills all available space, the parent of this object must provide bounded layout constraints."
https://api.flutter.dev/javadoc/io/flutter/plugin/platform/PlatformView.html

According to DevTools, the widget's parent is in fact providing bounded layout constraints:

But the Android (and iOS) code paints outside of these constraints. This does not seem like expected behavior.

Same behavior if I put the PlatformView in a ClipRect.

Perhaps also relevant is this commit, which seems to attempt to enforce clipping on platform views:
e0ac5da#diff-dc49b2234ad236214c9f647647549f56fa73e0f05d4873f84cfa0c03ff77b66dR86

Both RenderAndroidView and RenderUIKitView extend RenderBox so maybe that's where it would have to be addressed:

flutter/packages/flutter/lib/src/rendering/platform_view.dart

Line 77 in 99220b0

class RenderAndroidView extends RenderBox with _PlatformViewGestureMixin {

flutter/packages/flutter/lib/src/rendering/platform_view.dart

Line 279 in 99220b0

class RenderUiKitView extends RenderBox {

RenderBox computes (and uses?) intrinsic dimensions, so maybe that's why it's not respecting the constraints. I swear I read the constraints documentation.

Ideal behavior would be for the Android and iOS view to scale (i.e. from the native code's perspective, it should only "know about" the constrained area and only try to paint to that area). Put another way, it should work like a WebView.

cc: @bdlukaa who seems to know a lot about constraining platform views (#77416)

[TahaTesser]

Hi @sjschultze
Unable to run your project on the latest stable due to dependencies error so I have my own example with AndroidVIew and BoxConstraints seems to work

minimal code sample

import 'dart:async';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Material App',
      theme: ThemeData.dark(),
      home: Home(),
    );
  }
}

class Home extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('PlatformView WebView'),
      ),
      body: ConstrainedBox(
        constraints: BoxConstraints(
          minWidth: 70, minHeight:70, maxWidth: 150, maxHeight: 150,
        ),
              child: WebView(
          onWebViewCreated: (controller) {
            controller.loadUrl('https://flutter.dev/');
          },
        ),
      ),
    );
  }
}

typedef void WebViewCreatedCallback(WebViewController controller);

class WebView extends StatefulWidget {
  const WebView({
    Key key,
    this.onWebViewCreated,
  }) : super(key: key);

  final WebViewCreatedCallback onWebViewCreated;

  @override
  State<StatefulWidget> createState() => WebViewState();
}

class WebViewState extends State<WebView> {
  @override
  Widget build(BuildContext context) {
    if (defaultTargetPlatform == TargetPlatform.android) {
      return AndroidView(
        viewType: 'webview',
        onPlatformViewCreated: _onPlatformViewCreated,
      );
    } else if (defaultTargetPlatform == TargetPlatform.iOS) {
      return UiKitView(
        viewType: 'webview',
        onPlatformViewCreated: _onPlatformViewCreated,
      );
    }
    // TODO add other platforms
    return Text(
        '$defaultTargetPlatform is not yet supported by the map view plugin');
  }

  void _onPlatformViewCreated(int id) {
    if (widget.onWebViewCreated == null) {
      return;
    }
    widget.onWebViewCreated(new WebViewController(id));
  }
}

class WebViewController {
  WebViewController(int id) {
    this._channel = new MethodChannel('webview$id');
  }

  MethodChannel _channel;

  Future<void> loadUrl(String url) async {
    return _channel.invokeMethod('loadUrl', url);
  }
}

Preview

flutter doctor -v

[✓] Flutter (Channel stable, 2.2.2, on Linux, locale en_US.UTF-8)
    • Flutter version 2.2.2 at /home/taha/Code/flutter_stable
    • Framework revision d79295af24 (2 weeks ago), 2021-06-11 08:56:01 -0700
    • Engine revision 91c9fc8fe0
    • Dart version 2.13.3

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /home/taha/Code/SDK
    • Platform android-30, build-tools 30.0.3
    • ANDROID_HOME = /home/taha/Code/SDK
    • Java binary at: /home/taha/Code/android-studio/jre/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.8+0-b944-P17168821)
    • All Android licenses accepted.

[✓] Chrome - develop for the web
    • Chrome at google-chrome

[✓] Linux toolchain - develop for Linux desktop
    • Ubuntu clang version 12.0.0-1ubuntu1
    • cmake version 3.18.4
    • ninja version 1.8.2
    • pkg-config version 0.29.2

[✓] Android Studio (version 4.2)
    • Android Studio at /home/taha/Code/android-studio
    • Flutter plugin version 57.0.2
    • Dart plugin version 202.8531
    • Java version OpenJDK Runtime Environment (build 11.0.8+0-b944-P17168821)

[✓] VS Code (version 1.56.2)
    • VS Code at /usr/share/code
    • Flutter extension version 3.23.0

[✓] Connected device (3 available)
    • sdk gphone x86 arm (mobile) • emulator-5554 • android-x86    • Android 11
      (API 30) (emulator)
    • Linux (desktop)             • linux         • linux-x64      • Linux
    • Chrome (web)                • chrome        • web-javascript • Google
      Chrome 91.0.4472.114

• No issues found!

Then I tried the same constraints on webview sample and it works fine too

minimal code sample

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';
 
void main() => runApp(MyApp());
 
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Material App',
      home: Home(),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: ConstrainedBox(
                constraints: BoxConstraints(
          minWidth: 70, minHeight:70, maxWidth: 150, maxHeight: 150,
        ),
        child: WebViewExample()),
    );
  }
}

class WebViewExample extends StatefulWidget {
  @override
  WebViewExampleState createState() => WebViewExampleState();
}

class WebViewExampleState extends State<WebViewExample> {
  @override
  void initState() {
    super.initState();
    // Enable hybrid composition.
    if (Platform.isAndroid) WebView.platform = SurfaceAndroidWebView();
  }

  @override
  Widget build(BuildContext context) {
    return WebView(
      initialUrl: 'https://flutter.dev',
    );
  }
}

Preview

Can you please provide your flutter doctor -v

[sjschultze]

Huh, what deps weren't working? I'm on stable 2.2.2 and flutter doctor is happy:

flutter doctor -v
[✓] Flutter (Channel stable, 2.2.2, on Microsoft Windows [Version 10.0.19042.1052], locale en-US)
• Flutter version 2.2.2 at C:\Users\FOO\flutter
• Framework revision d79295a (2 weeks ago), 2021-06-11 08:56:01 -0700
• Engine revision 91c9fc8fe0
• Dart version 2.13.3

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
• Android SDK at C:\Users\FOO\AppData\Local\Android\sdk
• Platform android-30, build-tools 30.0.3
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6842174)
• All Android licenses accepted.

[✓] Chrome - develop for the web
• Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[✓] Android Studio (version 4.1.0)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6842174)

[✓] VS Code (version 1.57.1)
• VS Code at C:\Users\FOO\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.23.0

[✓] Connected device (3 available)
• Pixel 5 (mobile) • FOO • android-arm64 • Android 11 (API 30)
• Chrome (web) • chrome • web-javascript • Google Chrome 91.0.4472.114
• Edge (web) • edge • web-javascript • Microsoft Edge 91.0.864.54

• No issues found!

Then I build in VSCode straight out of that repo:

Running "flutter pub get" in example_zoom_app_boundedwidget...
Launching lib\main.dart on Pixel 5 in debug mode...
lib\main.dart:1
√  Built build\app\outputs\flutter-apk\app-debug.apk.
Connecting to VM Service at ws://127.0.0.1:62675/0ojNpqa3XYM=/ws

I am increasingly thinking that the native code is opening a new window that's not being constrained by the PlatformView and isn't being shown in DevTools. It doesn't seem like that's how PlatformViews should work... but maybe?

[TahaTesser]

Hi @sjschultze

Your project stuck when trying to run

logs

[  +69 ms] Running "flutter pub get" in example_zoom_app_boundedwidget...
[   +3 ms] executing: [C:\Users\Taha\StudioProjects\example_zoom_app_boundedwidget/]
C:\Users\Taha\Code\flutter_stable\bin\cache\dart-sdk\bin\pub --verbose get --no-precompile
[ +133 ms] FINE: Pub 2.13.3
[  +63 ms] MSG : Resolving dependencies...
[  +10 ms] SLVR: fact: flutter_zoom_plugin_example is 0.0.0
[   +4 ms] SLVR: derived: flutter_zoom_plugin_example
[  +16 ms] SLVR: fact: flutter_zoom_plugin_example depends on flutter any from sdk
[   +1 ms] SLVR: fact: flutter_zoom_plugin_example depends on cupertino_icons ^0.1.2
[        ] SLVR: fact: flutter_zoom_plugin_example depends on flutter_test any from sdk
[        ] SLVR: fact: flutter_zoom_plugin_example depends on flutter_zoom_plugin from git
[        ] SLVR:   selecting flutter_zoom_plugin_example
[        ] SLVR:   derived: flutter_zoom_plugin from git
[        ] SLVR:   derived: flutter_test any from sdk
[        ] SLVR:   derived: cupertino_icons ^0.1.2
[        ] SLVR:   derived: flutter any from sdk
[  +32 ms] IO  : Spawning "cmd /c git --version" in C:\Users\Taha\StudioProjects\example_zoom_app_boundedwidget\.
[ +407 ms] IO  : Finished git. Exit code 0.
[        ]     | stdout:
[        ]     | | git version 2.31.1.windows.1
[        ]     | Nothing output on stderr.
[        ] FINE: Determined git command git.
[   +1 ms] IO  : Get versions from https://pub.dartlang.org/api/packages/cupertino_icons.
[   +5 ms] IO  : Spawning "cmd /c git clone --mirror git://github.com/driftboat/flutter_zoom_plugin.git
C:\Users\Taha\AppData\Local\Pub\Cache\git\cache\flutter_zoom_plugin-5d8006b71a24ba7971d080c2816f59ffff4a5f8b" in
C:\Users\Taha\StudioProjects\example_zoom_app_boundedwidget\.
[  +12 ms] IO  : HTTP GET https://pub.dartlang.org/api/packages/cupertino_icons
[   +1 ms]     | Accept: application/vnd.pub.v2+json
[   +1 ms]     | X-Pub-OS: windows
[        ]     | X-Pub-Command: get
[   +1 ms]     | X-Pub-Session-ID: 9D538078-5B8F-4572-9167-56EEEFFBC2B2
[   +1 ms]     | X-Pub-Environment: flutter_cli:verify:run
[        ]     | X-Pub-Reason: direct
[        ]     | user-agent: Dart pub 2.13.3
[ +361 ms] IO  : HTTP response 200 OK for GET https://pub.dartlang.org/api/packages/cupertino_icons
[   +1 ms]     | took 0:00:00.368272
[   +1 ms]     | transfer-encoding: chunked
[   +1 ms]     | date: Tue, 29 Jun 2021 08:38:07 GMT
[   +1 ms]     | content-encoding: gzip
[   +1 ms]     | vary: Accept-Encoding
[        ]     | strict-transport-security: max-age=31536000; preload
[        ]     | via: 1.1 google
[        ]     | content-type: application/json; charset="utf-8"
[        ]     | x-frame-options: SAMEORIGIN
[        ]     | x-xss-protection: 1; mode=block
[        ]     | x-content-type-options: nosniff
[        ]     | server: dart:io with Shelf
[  +38 ms] IO  : Writing 7128 characters to text file
C:\Users\Taha\AppData\Local\Pub\Cache\hosted\pub.dartlang.org\.cache\cupertino_icons-versions.json.
[   +1 ms] FINE: Contents:
[   +3 ms]     |
{"name":"cupertino_icons","latest":{"version":"1.0.3","pubspec":{"name":"cupertino_icons","description":"Default icons
asset for Cupertino widgets based on Apple styled
icons","homepage":"https://github.com/flutter/packages/tree/master/third_party/packages/cupertino_icons","version":"1.0.
3","flutter":{"fonts":[{"family":"CupertinoIcons","fonts":[{"asset":"assets/CupertinoIcons.ttf"}]}]},"environment":{"sdk
":">=2.12.0
<3.0.0"}},"archive_url":"https://pub.dartlang.org/packages/cupertino_icons/versions/1.0.3.tar.gz","published":"2021-05-0
3T20:02:11.879159Z"},"versions":[{"version":"0.1.0","pubspec":{"homepage":"https://github.com/flutter/cupertino_icons","
version":"0.1.0","name":"cupertino_icons","flutter":{"assets":["assets/CupertinoIcons.ttf"]},"author":"Flutter Team
<flutter-dev@googlegroups.com>","description":"Default icons asset for Cupertino
widgets"},"archive_url":"https://pub.dartlang.org/packages/cupertino_icons/versions/0.1.0.tar.gz","published":"2017-09-1
8T23:23:28.544547Z"},{"version":"0.1.1","pubspec":{"homepage":"https://github.com/flutter/cupertino_icons","version":"0.
1.1","name":"cupertino_icons","flutter":{"fonts":[{"fonts":[{"asset":"assets/CupertinoIcons.ttf"}],"family":"CupertinoIc
ons"}]},"author":"Flutter Team <flutter-dev@googlegroups.com>","description":"Default icons asset for Cupertino
widgets"},"archive_url":"https://pub.dartlang.org/packages/cupertino_icons/versions/0.1.1.tar.gz","published":"2017-09-1
9T01:31:56.606640Z"},{"version":"0.1.2","pubspec":{"version":"0.1.2","name":"cupertino_icons","author":"Flutter Team
<flutter-dev@googlegroups.com>","flutter":{"fonts":[{"fonts":[{"asset":"assets/CupertinoIcons.ttf"}],"family":"Cupertino
Icons"}]},"description":"Default icons asset for Cupertino
widgets","homepage":"https://github.com/flutter/cupertino_icons","environment":{"sdk":">=2.0.0-dev.28.0
<3.0.0"}},"archive_url":"https://pub.dartlang.org/packages/cupertino_icons/versions/0.1.2.tar.gz","published":"2018-04-0
5T01:07:47.331920Z"},{"version":"0.1.3","pubspec":{"name":"cupertino_icons","description":"Default icons asset for
Cupertino
widgets","homepage":"https://github.com/flutter/cupertino_icons","version":"0.1.3","flutter":{"fonts":[{"family":"Cupert
inoIcons","fonts":[{"asset":"assets/CupertinoIcons.ttf"}]}]},"environment":{"sdk":">=2.0.0-dev.28.0
<3.0.0"}},"archive_url":"https://pub.dartlang.org/packages/cupertino_icons/versions/0.1.3.tar.gz","published":"2019-12-0
2T21:39:51.845248Z"},{"version":"1.0.0-dev.1","pubspec":{"name":"cupertino_icons","description":"Default icons asset for
Cupertino widgets based on Apple styled
icons","homepage":"https://github.com/flutter/cupertino_icons","version":"1.0.0-dev.1","flutter":{"fonts":[{"family":"Cu
pertinoIcons","fonts":[{"asset":"assets/CupertinoIcons.ttf"}]}]},"environment":{"sdk":">=2.0.0-dev.28.0
<3.0.0","flutter":">=1.22.0-10.0"}},"archive_url":"https://pub.dartlang.org/packages/cupertino_icons/versions/1.0.0-dev.
1.tar.gz","published":"2020-09-02T08:38:04.627863Z"},{"version":"1.0.0-dev.2","pubspec":{"name":"cupertino_icons","descr
iption":"Default icons asset for Cupertino widgets based on Apple styled
icons","homepage":"https://github.com/flutter/cupertino_icons","version":"1.0.0-dev.2","flutter":{"fonts":[{"family":"Cu
pertinoIcons","fonts":[{"asset":"assets/CupertinoIcons.ttf"}]}]},"environment":{"sdk":">=2.0.0-dev.28.0
<3.0.0","flutter":">=1.22.0-10.0"}},"archive_url":"https://pub.dartlang.org/packages/cupertino_icons/versions/1.0.0-dev.
2.tar.gz","published":"2020-09-02T10:19:09.199714Z"},{"version":"1.0.0-dev.3","pubspec":{"name":"cupertino_icons","descr
iption":"Default icons asset for Cupertino widgets based on Apple styled
icons","homepage":"https://github.com/flutter/cupertino_icons","version":"1.0.0-dev.3","flutter":{"fonts":[{"family":"Cu
pertinoIcons","fonts":[{"asset":"assets/CupertinoIcons.ttf"}]}]},"environment":{"sdk":">=2.0.0-dev.28.0
<3.0.0","flutter":">=1.22.0-10.0"}},"archive_url":"https://pub.dartlang.org/packages/cupertino_icons/versions/1.0.0-dev.
3.tar.gz","published":"2020-09-02T19:48:26.513707Z"},{"version":"1.0.0-dev.4","pubspec":{"name":"cupertino_icons","descr
iption":"Default icons asset for Cupertino widgets based on Apple styled
icons","homepage":"https://github.com/flutter/cupertino_icons","version":"1.0.0-dev.4","flutter":{"fonts":[{"family":"Cu
pertinoIcons","fonts":[{"asset":"assets/CupertinoIcons.ttf"}]}]},"environment":{"sdk":">=2.0.0-dev.28.0
<3.0.0","flutter":">=1.22.0-2.0.0"}},"archive_url":"https://pub.dartlang.org/packages/cupertino_icons/versions/1.0.0-dev
.4.tar.gz","published":"2020-09-03T09:00:37.123747Z"},{"version":"1.0.0","pubspec":{"name":"cupertino_icons","descriptio
n":"Default icons asset for Cupertino widgets based on Apple styled
icons","homepage":"https://github.com/flutter/cupertino_icons","version":"1.0.0","flutter":{"fonts":[{"family":"Cupertin
oIcons","fonts":[{"asset":"assets/CupertinoIcons.ttf"}]}]},"environment":{"sdk":">=2.0.0
<3.0.0"}},"archive_url":"https://pub.dartlang.org/packages/cupertino_icons/versions/1.0.0.tar.gz","published":"2020-09-0
3T20:42:44.309567Z"},{"version":"1.0.1","pubspec":{"name":"cupertino_icons","description":"Default icons asset for
Cupertino widgets based on Apple styled
icons","homepage":"https://github.com/flutter/cupertino_icons","version":"1.0.1","flutter":{"fonts":[{"family":"Cupertin
oIcons","fonts":[{"asset":"assets/CupertinoIcons.ttf"}]}]},"environment":{"sdk":">=2.12.0-0
<3.0.0"}},"archive_url":"https://pub.dartlang.org/packages/cupertino_icons/versions/1.0.1.tar.gz","published":"2020-11-0
7T00:39:25.748110Z"},{"version":"1.0.1+1","pubspec":{"name":"cupertino_icons","description":"Default icons asset for
Cupertino widgets based on Apple styled
icons","homepage":"https://github.com/flutter/cupertino_icons","version":"1.0.1+1","flutter":{"fonts":[{"family":"Cupert
inoIcons","fonts":[{"asset":"assets/CupertinoIcons.ttf"}]}]},"environment":{"sdk":">=2.12.0-0
<3.0.0"}},"archive_url":"https://pub.dartlang.org/packages/cupertino_icons/versions/1.0.1%2B1.tar.gz","published":"2020-
11-17T21:14:02.302199Z"},{"version":"1.0.2","pubspec":{"name":"cupertino_icons","description":"Default icons asset for
Cupertino widgets based on Apple styled
icons","homepage":"https://github.com/flutter/cupertino_icons","version":"1.0.2","flutter":{"fonts":[{"family":"Cupertin
oIcons","fonts":[{"asset":"assets/CupertinoIcons.ttf"}]}]},"environment":{"sdk":">=2.12.0-0
<3.0.0"}},"archive_url":"https://pub.dartlang.org/packages/cupertino_icons/versions/1.0.2.tar.gz","published":"2020-12-1
6T08:28:59.132998Z"},{"version":"1.0.3","pubspec":{"name":"cupertino_icons","description":"Default icons asset for
Cupertino widgets based on Apple styled
icons","homepage":"https://github.com/flutter/packages/tree/master/third_party/packages/cupertino_icons","version":"1.0.
3","flutter":{"fonts":[{"family":"CupertinoIcons","fonts":[{"asset":"assets/CupertinoIcons.ttf"}]}]},"environment":{"sdk
":">=2.12.0
<3.0.0"}},"archive_url":"https://pub.dartlang.org/packages/cupertino_icons/versions/1.0.3.tar.gz","published":"2021-05-0
3T20:02:11.879159Z"}],"_fetchedAt":"2021-06-29T11:38:06.102213"}

Since this is simply Platformview, you should be able to reproduce with webview_flutter or google_maps_flutter which in my testing works fine #85171 (comment)

Please provide a reproducible sample with webview_flutter or google_maps_flutter instead of a custom package
Thank you

[sjschultze]

Unless I'm mistaken, there's no error in your logs. What error do you think is happening? I can generate similar output by running flutter pub get -v on the command line. Then the build works and the app runs on my device.

As your example proves, an ordinary AndroidView with simple code works fine. I appreciate the work you did to create the example.

However, the issue here is that the underlying Android (and iOS) code appears to be opening a new window that breaks out of the PlatformView constraints. To be clear, this has nothing to do with a WebView. I just mentioned WebViews in my initial issue report as an example of how a PlatformView should operate (i.e. nothing from the PlatformView widget should ever paint outside of that widget's bounded constraints).

The code in question (for Android) is inside this .aar file used by a plugin, so it's hard for me to point to the specific line that causes the issue -- but I assure you the issue exists (and you should be able to see it occur by building the project). That code isn't showing a web page -- via flutter or Android. It's showing an Android screen created by that plugin.

I can surmise that what's going on wrong from the Android side is that the Window or the decorView of that Window is not being sized properly. And I can likewise surmise that something similar is happening on iOS. But I have no idea how to investigate whether that's the case or how it would be fixed in the flutter AndroidView or UIKitView code. From the perspective of the DevTools widget inspector, my PlatformView is working as expected.

But this really doesn't seem like the intended behavior of a PlatformView.

[TahaTesser]

@sjschultze
Thanks for the details, In order to address the issue, we would have to reproduce it tho and your project doesn't run

I don't mind recreating the project from the code in your repository to be able to run it but I just noticed your Android app doesn't have any java or kotlin, no main activity https://github.com/sjschultze/example_zoom_app_boundedwidget/tree/main/android/app/src/main, I am not sure an app would run without those files

Can you please clone your repository in a separate folder and try to run it?

Thank you

[sjschultze]

I am so very confused. I can clone the repo and build the flutter project therein. Other people have done so. You haven't shown me any error you are having doing so.

I literally clone, open the project in VSCode, go to main.dart, and run/debug with my Pixel 5 as the target. All of this is according to the official Flutter documentation. What are you doing?

[sjschultze]

nudge no-response bot

[TahaTesser]

Hi @sjschultze
There is no error printed when running your project, it simply gets stuck when running, it doesn't have the main activity or any class files, check out the link.

I can surmise that what's going on wrong from the Android side is that the Window or the decorView of that Window is not being sized properly. And I can likewise surmise that something similar is happening on iOS. But I have no idea how to investigate whether that's the case or how it would be fixed in the flutter AndroidView or UIKitView code. From the perspective of the DevTools widget inspector, my PlatformView is working as expected.

But this really doesn't seem like the intended behavior of a PlatformView.

Please provide a reproducible code sample without third-party packages (without flutter_zoom_plugin)

google_maps_flutter and webview_flutter are platform views, both work with BoxConstraints. If the issue is with PlatformView, it should be reproducible.

If the issue doesn't reproduce this platform view packages, here is my example that uses AndroidView and UIKItview without any third-party packages, (contains mainActivity). Feel free to edit this project to make the issue reproducible. this is a basic example of custom webview.

platformview_webview_example.zip