linux app not work

[winner484]

Flutter version

$ flutter --version

Flutter 1.3.10 • channel dev • https://github.com/flutter/flutter.git
Framework • revision 4feefa3c9a (2 days ago) • 2019-03-14 10:21:03 -0400
Engine • revision 8b1a299ed5
Tools • Dart 2.2.1 (build 2.2.1-dev.1.0 674fd0e060)

Does the prebuilt and portable version works ?

Download Link

• Yes

Steps to Reproduce

1. use IDEA build a default flutter app "untitled"
2. copy "untitled" to /go-flutter-0.4.0-alpha/example/simpleDemo/flutter_project
3. cd /utitled2 flutter build bundle
4. cd ../.. copy main.go .rename to main1.go. modify main1.go path.
5. export CGO_LDFLAGS="-L${PWD}"
6. go build main1.go
7. get the main1 app .
8. open main1 but ERROR

    fengyu@fengyu-desktop:~/go-flutter-0.4.0-alpha/example/simpleDemo$ ./main1 
[ERROR:flutter/shell/platform/embedder/embedder_surface_gl.cc(95)] Could not create a resource context for async texture uploads. Expect degraded performance. Set a valid make_resource_current callback on FlutterOpenGLRendererConfig.
flutter: Observatory listening on http://127.0.0.1:50300/
[ERROR:flutter/shell/platform/embedder/embedder_surface_gl.cc(95)] Could not create a resource context for async texture uploads. Expect degraded performance. Set a valid make_resource_current callback on FlutterOpenGLRendererConfig.
calculated pixelRatio limited to a minimum of 1.0
flutter: ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
flutter: The following assertion was thrown building MyApp(dirty):
flutter: Unknown platform.
flutter: linux was not recognized as a target platform. Consider updating the list of TargetPlatforms to
flutter: include this platform.
flutter: 
flutter: When the exception was thrown, this was the stack:
flutter: #0      defaultTargetPlatform (package:flutter/src/foundation/platform.dart:68:5)
flutter: #1      new ThemeData (package:flutter/src/material/theme_data.dart:214:18)
flutter: #2      MyApp.build (package:untitled2/main.dart:11:14)
flutter: #3      StatelessElement.build (package:flutter/src/widgets/framework.dart:3788:28)
flutter: #4      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3735:15)
flutter: #5      Element.rebuild (package:flutter/src/widgets/framework.dart:3558:5)
flutter: #6      ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3715:5)
flutter: #7      ComponentElement.mount (package:flutter/src/widgets/framework.dart:3710:5)
flutter: #8      Element.inflateWidget (package:flutter/src/widgets/framework.dart:2954:14)
flutter: #9      Element.updateChild (package:flutter/src/widgets/framework.dart:2757:12)
flutter: #10     RenderObjectToWidgetElement._rebuild (package:flutter/src/widgets/binding.dart:933:16)
flutter: #11     RenderObjectToWidgetElement.mount (package:flutter/src/widgets/binding.dart:904:5)
flutter: #12     RenderObjectToWidgetAdapter.attachToRenderTree.<anonymous closure> (package:flutter/src/widgets/binding.dart:850:17)
flutter: #13     BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2251:19)
flutter: #14     RenderObjectToWidgetAdapter.attachToRenderTree (package:flutter/src/widgets/binding.dart:849:13)
flutter: #15     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.attachRootWidget (package:flutter/src/widgets/binding.dart:736:7)
flutter: #16     runApp (package:flutter/src/widgets/binding.dart:780:7)
flutter: #17     main (package:untitled2/main.dart:3:16)
flutter: #18     _runMainZoned.<anonymous closure>.<anonymous closure> (dart:ui/hooks.dart:199:25)
flutter: #23     _runMainZoned.<anonymous closure> (dart:ui/hooks.dart:190:5)
flutter: #24     _startIsolate.<anonymous closure> (dart:isolate/runtime/lib/isolate_patch.dart:300:19)
flutter: #25     _RawReceivePortImpl._handleMessage (dart:isolate/runtime/lib/isolate_patch.dart:171:12)
flutter: (elided 4 frames from package dart:async)
flutter: ════════════════════════════════════════════════════════════════════════════════════════════════════
flutter: Another exception was thrown: Unknown platform.
    flutter: Another exception was thrown: Unknown platform.

[GeertJohan]

You will need to override the platform in your Flutter aplication, in main.dart add this line before runApp(..):

  debugDefaultTargetPlatformOverride = TargetPlatform.fuchsia;
  runApp(new MyApp());

Currently, the flutter framework only supports android, ios and fuchsia, so we have to "fake" being one of those three.

If you want to use your app on mobile as well, create two main files;

• main.dart > for normal mobile development
• main_desktop.dart > with the platform override. Then use flutter build bundle lib/main_desktop.dart to build the app for desktop.

[winner484]

@GeertJohan Thank you very much! It works! BUT not well.
i tried to build a default flutter project , everything went good on AVD, but the linux version can not show any word. even the homopage title can not been showed.

fengyu@fengyu-desktop:~/go-flutter/example/simpleDemo$ ./main2
[ERROR:flutter/shell/platform/embedder/embedder_surface_gl.cc(95)] Could not create a resource 
context for async texture uploads. Expect degraded performance. Set a valid make_resource_current 
callback on FlutterOpenGLRendererConfig.
flutter: Observatory listening on http://127.0.0.1:50300/
[ERROR:flutter/shell/platform/embedder/embedder_surface_gl.cc(95)] Could not create a resource 
context for async texture uploads. Expect degraded performance. Set a valid make_resource_current 
callback on FlutterOpenGLRendererConfig.
calculated pixelRatio limited to a minimum of 1.0

[winner484]

@GeertJohan even the prebuilt demo also shows the same error in terminal, but the gui app works will,and every word can be showed.
Which flutter version should i use?

[GeertJohan]

The errors that you see should not cause an issue with your app. Probably there is a plugin that is not working correctly?
Please update to the latest version of go-flutter, it has a new plugin setup and will log more information when there is a missing plugin.

[winner484]

@GeertJohan Thank you! i already use the latest go-flutter version.but still can not work.
Which version of flutter do you use?
Android studio or IDEA?

[GeertJohan]

It should work with the beta channel, at version 1.3.8

[pchampio]

@LucasZanella Ah, this repo is about go-flutter, an alternative embedder to the official flutter project.
Sorry about the confusion.

To use this alternative embedder please use hover.
Make sure to read the repos README 😉 .