Error in emulator when opening the second display

[joranmulderij]

I got this error:

E/flutter ( 4259): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:607:7)
E/flutter ( 4259): #1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:177:18)
E/flutter ( 4259): <asynchronous suspension> 

when running on an android emulator. I tested multiple emulator devices, but they all gave the same error.

To Reproduce
Steps to reproduce the behavior:

1. Run Pixel C api 30 android emulator
2. Add a second display.
3. Launch the example app
4. Click "Get Displays"
5. Put the ID for the second display into the textbox
6. Click show presentation
7. Look at the console

Expected behavior
The second display should show something.

Smartphone:

• Device: Pixel C
• OS: Android api 30

[fbernaly]

I am getting the exact same Exception:

I/ContentValues( 2962): Channel: method: showPresentation | arguments: {"displayId": 2,"routerName": "presentation"}
I/ContentValues( 2962): Channel: method: showPresentation | displayId: 2 | routerName: presentation
E/flutter ( 2962): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: PlatformException(showPresentation, Unable to add window android.view.ViewRootImpl$W@379a897 -- the specified display can not be found, null, null)
E/flutter ( 2962): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:607:7)
E/flutter ( 2962): #1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:177:18)
E/flutter ( 2962): <asynchronous suspension>

Emulator
Pixel 3
API 31

[fbernaly]

So far, when I use the emulator is not working, but when I use an actual Android device and Chromecast as my secondary display it works. Same for iOS, in case of iPad I can use an HDMI cable or AppleTV. On iPhone I tested AppleTV and it works, I was not able to test cable, because I do not have a lighting to HDMI adapter.
So far that is what I am trying to do, and this does not represent an issue for me anymore.

[joranmulderij]

Oh that is good to know. I do think it also needs to work on an emulator, and the issue does also seem to be android specific. Thanks for testing.

[kerberjg]

@fbernaly How do you set up the Chromecast as a secondary display? I'd like to help debug this

[fbernaly]

@kerberjg : It has been more than 2 years, I stopped working on that project, I am sorry but I dont remeber where I left the code or what I did for that.