Portrait - LCD - does not work

[boeledi]

Hi,

First of all so many thanks for your 'flutter-pi'. It really works very well.

There is only 1 problem I am currently facing using the "standard" 7" LCD display.

Flutter-pi only works in Landscape mode (even if the lcd_rotate=2).
Also, "await SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp, DeviceOrientation.portraitDown]);" prevents the application from running.

Would you have any solution to this?

In advance, many thanks

Didier

[ardera]

Okay, I'll try to reproduce your error.

even if the lcd_rotate=2

I recommend not using the linux or raspberry pi firmware settings to rotate the display, the rotation is entirely done by flutter-pi. Also, at least in my experience, most of the display settings inside config.txt are kinda hacky and glitchy

[bottee]

Hi,

first of all, this is a really great project. Thank you very much for making it available to everybody!

I have the same problem here. It happens without any modification in config.tx. If I start my flutter app in landscape mode everything works like a charm.
But if I add await SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp, DeviceOrientation.portraitDown]); to my flutter application it stops after the startup animation and changes to dark colors.

I have a Raspi4 with 4GB Ram and the official 7" LCD touch Dislplay.

Do you have any hints how to find the cause?

[gustavsl]

I can confirm this same issue - not on a Raspberry Pi but on an i.MX 6 device.
Flutter application displays black screen after adding setPreferredOrientations.

[ardera]

Weird, it works fine for me. I created a brand-new barebones flutter project using flutter create and put the call to setPreferredOrientations into the initState and build methods.

Can anyone send me some more code so I can reproduce the issue?

[gustavsl]

I'm using the example from https://github.com/google/flutter-desktop-embedding/tree/master/example adding await SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]); before runApp(new MyApp());.

[ardera]

When I put the SystemChrome.setPreferredOrientations call before runApp this error message is printed:

[ERROR:engine/src/flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: ServicesBinding.defaultBinaryMessenger was accessed before the binding was initialized.
If you're running an application and need to access the binary messenger before `runApp()` has been called (for example, during plugin initialization), then you need to explicitly call the `WidgetsFlutterBinding.ensureInitialized()` first.
If you're running a test, you can call the `TestWidgetsFlutterBinding.ensureInitialized()` as the first line in your test's `main()` method to initialize the binding.
#0      defaultBinaryMessenger.<anonymous closure> (package:flutter/src/services/binary_messenger.dart:76:7)
#1      defaultBinaryMessenger (package:flutter/src/services/binary_messenger.dart:89:4)
#2      MethodChannel.binaryMessenger (package:flutter/src/services/platform_channel.dart:140:62)
#3      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:314:35)
#4      OptionalMethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:429:36)
#5      SystemChrome.setPreferredOrientations (package:flutter/src/services/system_chrome.dart:236:35)
#6      main (package:orientation/main.dart:8:6)
#7      _runMainZoned.<anonymous closure>.<anonymous closure> (dart:ui/hooks.dart:239:25)
#8      _rootRun (dart:async/zone.dart:1126:13)
#9      _CustomZone.run (dart:async/zone.dart:1023:19)
#10     _runZoned (dart:async/zone.dart:1518:10)
#11     runZoned (dart:async/zone.dart:1502:12)
#12     _runMainZoned.<anonymous closure> (dart:ui/hooks.dart:231:5)
#13     _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:307:19)
#14     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174:12)

As it says in the error message, just don't use SystemChrome.setPreferredOrientations before the runApp call.

runApp initializes the bindings to the platform side. SystemChrome.setPreferredOrientations needs these bindings to be initialized, since it uses these bindings to tell the platform side about the preferred orientations. I think, in general, it's a bad idea to do flutter-specific stuff before the runApp call.

[bottee]

Sorry for this late response. I tried to create a minimal version to reproduce the issue, as my project is quite sensitive. As a result I found that the issue is caused by Flutter. So from my side the issue is not an flutter_pi issue. I'm sorry for the inconvenience.

And thank you for this great project!