[webview_flutter_tizen] crash when run on real TV device

[Stupidman22]

I'm running the example https://github.com/flutter-tizen/plugins/blob/master/packages/webview_flutter/example/lib/main.dart
in TV emulator then it work normal.
When using the code to run in real samsung TV device (tizen 6.0)
then it crash and can not load webview:
[E] [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(Invalid operation, The webview instance has not been initialized., null, null)
#0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:651:7)
#1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:322:18)
Any one help me figure out this issue pls

[Stupidman22]

If run in emulator then can not play video in any page... Any one face this issue :(

[JSUYA]

Hi

[E] [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(Invalid operation, The webview instance has not been initialized., null, null)

It's not common case to fail to create an internal WebView instance. Does this happen every time?
We need more information.

If run in emulator then can not play video in any page... Any one face this issue :(

What kind of video are you playing? The example is blocking youtube.com (for testing). Also, YouTube video cannot be played on the emulator.

plugins/packages/webview_flutter/example/lib/main.dart

Line 145 in 0d363f0

if (request.url.startsWith('https://www.youtube.com/')) {

If you need to play YouTube on your device, please change the backgroundColor of the example.
https://github.com/flutter-tizen/plugins/blob/master/packages/webview_flutter/README.md#note

[Stupidman22]

Hi, With emulator first.

1. I try to using this emulator:
   
2. I already remove blocking youtube request in example in plugins/packages/webview_flutter/example/lib/main.dart
3. And change background color to transparent as well.
4. The result is: Everything works except for video content on all sites
   

[JSUYA]

Hi
webview_flutter_tizen was written based on Tizen's ewk webview.
ewk webview does not support youtube play in the emulator.
Here's a similar case. youtube_player_iframe (researched it before...) is using webview internally and has the same problem.
#517

[Stupidman22]

Hi @JSUYA , Now i tried to work with real TV devices:

1. I'm already connect and install test app with this device
   
2. My devices capability is:
   
3. I tried to run example to my real TV device and the result is crash log and tv with back screen app :
   
4. I tried to use the basic example only have webview
   `import 'package:flutter/material.dart';
   import 'package:webview_flutter/webview_flutter.dart';

void main() => runApp(const MaterialApp(home: WebViewExample()));

class WebViewExample extends StatefulWidget {
const WebViewExample({super.key});

@OverRide
State createState() => _WebViewExampleState();
}

class _WebViewExampleState extends State {
final WebViewController _controller = WebViewController();

@OverRide
void initState() {
super.initState();

_controller.loadRequest(Uri.parse('https://flutter.dev'));

}

@OverRide
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.transparent,
body: WebViewWidget(controller: _controller),
);
}
}`

[JSUYA]

HI, Thank you for your detail. I found some suspicious codes. Can you apply this patch and check if crash still occurs?
If the crash still occurs, the added log may be output. Please tell me that together.
#652

[Stupidman22]

Thank you, Let me try it. I will back soon

[swift-kim]

@JSUYA The LOG_ERROR (dlog) messages cannot be seen by normal users. You can use printf (for testing purpose) or have to use a method/event channel to log an error message.

[Stupidman22]

@JSUYA I tried to apply dependency from your branch:

but it still remain the same error and no more log show. I think it's the same as @swift-kim commented above.

[Stupidman22]

I tried to change log to printf and apply at Stupidman22@5fbadbe
Still the same error with no log in console.

[JSUYA]

@Stupidman22 Thank you for your check. I will check again. It may take some more time.

[Stupidman22]

Hope to receive good news from you

[JSUYA]

Hope to receive good news from you

Sorry, I set up a tizen 6.0 device and binary and tried again with your modified example code.
A web page was worked on my device. I can't reproduce crash case.

$ sdb capability
secure_protocol:enabled
intershell_support:enabled
filesync_support:pushpull
usbproto_support:disabled
sockproto_support:enabled
syncwinsz_support:enabled
sdbd_rootperm:disabled
rootonoff_support:enabled
encryption_support:disabled
zone_support:disabled
multiuser_support:enabled
cpu_arch:armv7
sdk_toolpath:/home/owner/share/tmp/sdk_tools
profile_name:tv
vendor_name:Samsung
can_launch:tv-samsung
device_name:Tizen
platform_version:6.0
product_version:4.0
sdbd_version:2.2.31
sdbd_plugin_version:3.8.4_TV_DBG
sdbd_cap_version:1.0
log_enable:disabled
log_path:/tmp
appcmd_support:disabled
appid2pid_support:enabled
pkgcmd_debugmode:enabled
netcoredbg_support:enabled

The error log you reported is occurs when Tizen web engine instance used in the webview is not created properly.
The parts that do not check the creation of a web engine instance and the creation of a method channel with out check web engine instance must be modified.
(However, this will not make it guarantee work on your device.)

How about using webview_flutter_lwe?
(this webview is a light engine, media play like YouTube is not guaranteed to work.)

[Stupidman22]

I had tried webview_flutter_lwe before. The web load about 98 or 99% then stop.

I will test my code in other device to make sure. I will back soon