error CS0246: The type or namespace name 'AndroidJavaClass' could not be found (are you missing a using directive or an assembly reference?)

[rmib200]

Describe the bug
After importing the unitypackage a "Multiple precompiled assemblies with the same name Newtonsoft.Json.dll included or the current platform. Only one assembly with the same name is allowed per platform." error appeared. I deleted the JsonDotNet folder and event tried to impot the unitypackage without the folder but the same errors appears:

Assets\FlutterUnityIntegration\NativeAPI.cs(29,13): error CS0246: The type or namespace name 'AndroidJavaClass' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(29,39): error CS0246: The type or namespace name 'AndroidJavaClass' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(32,16): error CS0246: The type or namespace name 'Exception' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(34,13): error CS0103: The name 'Debug' does not exist in the current context

Assets\FlutterUnityIntegration\NativeAPI.cs(48,13): error CS0246: The type or namespace name 'AndroidJavaClass' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(48,39): error CS0246: The type or namespace name 'AndroidJavaClass' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(51,16): error CS0246: The type or namespace name 'Exception' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(53,13): error CS0103: The name 'Debug' does not exist in the current context

Assets\FlutterUnityIntegration\NativeAPI.cs(67,26): error CS0246: The type or namespace name 'AndroidJavaClass' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(68,49): error CS0246: The type or namespace name 'AndroidJavaObject' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(71,16): error CS0246: The type or namespace name 'Exception' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(73,13): error CS0103: The name 'Debug' does not exist in the current context

Assets\FlutterUnityIntegration\NativeAPI.cs(85,13): error CS0246: The type or namespace name 'AndroidJavaClass' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(85,39): error CS0246: The type or namespace name 'AndroidJavaClass' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(86,13): error CS0246: The type or namespace name 'AndroidJavaObject' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(86,63): error CS0246: The type or namespace name 'AndroidJavaObject' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(89,16): error CS0246: The type or namespace name 'Exception' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(91,13): error CS0103: The name 'Debug' does not exist in the current context

Assets\FlutterUnityIntegration\NativeAPI.cs(103,13): error CS0246: The type or namespace name 'AndroidJavaClass' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(103,39): error CS0246: The type or namespace name 'AndroidJavaClass' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(104,13): error CS0246: The type or namespace name 'AndroidJavaObject' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(104,63): error CS0246: The type or namespace name 'AndroidJavaObject' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(107,16): error CS0246: The type or namespace name 'Exception' could not be found (are you missing a using directive or an assembly reference?)

Assets\FlutterUnityIntegration\NativeAPI.cs(109,13): error CS0103: The name 'Debug' does not exist in the current context

To Reproduce
Steps to reproduce the behavior:

1. Import Package as directed in readme
2. Delete JsonDotNet folder
3. New errors appeared

Expected behavior
A "Flutter" option should appear in the navbar.

Screenshots
If applicable, add screenshots to help explain your problem.

Unity (please complete the following information):

• OS: Windows 10
• Version 2020.3.28f1

Smartphone (please complete the following information):

• OS: Android

Additional context
Add any other context about the problem here.

[WouterVandenputte]

Same issue here. (Also had to delete the jsonDotNet since it conflicted with another dll in the Library folder). Solution is real simple. Open the one file where that error occurrs and add the import. You should go from

using System.Runtime.InteropServices;
using UnityEngine.SceneManagement;

to

using System;
using UnityEngine;
using UnityEngine.SceneManagement;

[rmib200]

Thanks! I helped solve many of the problems. Although 2 persist:

Assets\FlutterUnityIntegration\Editor\Build.cs(276,37): error CS0117: 'EditorUserBuildSettings' does not contain a definition for 'iOSXcodeBuildConfig'

Assets\FlutterUnityIntegration\Editor\Build.cs(276,59): error CS0103: The name 'XcodeBuildConfig' does not exist in the current context

Did you also encountered them after adding the imports?. I'm actually building for android and my project is set for that platform.

[ernonemacher]

I believe these errors are happening in the newest versions of Unity. In order to fix it and run normally I did what @WouterVandenputte said and changed the Build.cs file from

EditorUserBuildSettings.iOSXcodeBuildConfig = XcodeBuildConfig.Release;

to

EditorUserBuildSettings.iOSBuildConfigType = iOSBuildType.Release;

[rmib200]

Thanks you are a savior!

I believe these errors are happening in the newest versions of Unity. In order to fix it and run normally I did what @WouterVandenputte said and changed the Build.cs file from

EditorUserBuildSettings.iOSXcodeBuildConfig = XcodeBuildConfig.Release;

to

EditorUserBuildSettings.iOSBuildConfigType = iOSBuildType.Release;

[rmib200]

I was trying to export my project going to "Flutter/Export Android", but when it is about to finish this error appears:

FileNotFoundException: Could not find file "D:\Unity\android\build.gradle"
System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean anonymous, System.IO.FileOptions options) (at <695d1cc93cca45069c528c15c9fdd749>:0)
System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.IO.FileOptions options, System.String msgPath, System.Boolean bFromProxy, System.Boolean useLongPath, System.Boolean checkHost) (at <695d1cc93cca45069c528c15c9fdd749>:0)
(wrapper remoting-invoke-with-check) System.IO.FileStream..ctor(string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare,int,System.IO.FileOptions,string,bool,bool,bool)
System.IO.StreamReader..ctor (System.String path, System.Text.Encoding encoding, System.Boolean detectEncodingFromByteOrderMarks, System.Int32 bufferSize, System.Boolean checkHost) (at <695d1cc93cca45069c528c15c9fdd749>:0)
System.IO.StreamReader..ctor (System.String path, System.Text.Encoding encoding, System.Boolean detectEncodingFromByteOrderMarks, System.Int32 bufferSize) (at <695d1cc93cca45069c528c15c9fdd749>:0)
System.IO.StreamReader..ctor (System.String path, System.Boolean detectEncodingFromByteOrderMarks) (at <695d1cc93cca45069c528c15c9fdd749>:0)
System.IO.StreamReader..ctor (System.String path) (at <695d1cc93cca45069c528c15c9fdd749>:0)
(wrapper remoting-invoke-with-check) System.IO.StreamReader..ctor(string)
System.IO.File.ReadAllText (System.String path) (at <695d1cc93cca45069c528c15c9fdd749>:0)
FlutterUnityIntegration.Editor.Build.SetupAndroidProject () (at Assets/FlutterUnityIntegration/Editor/Build.cs:356)
FlutterUnityIntegration.Editor.Build.DoBuildAndroid (System.String buildPath, System.Boolean isPlugin) (at Assets/FlutterUnityIntegration/Editor/Build.cs:171)
FlutterUnityIntegration.Editor.Build.DoBuildAndroidLibrary () (at Assets/FlutterUnityIntegration/Editor/Build.cs:33)

I tried enabling "Export project" in Build Settings and enabling custom gradle in Publisher Settings with no success.
Does anyone has any idea on how to proceed?

[jamesncl]

@rmib200 I think this is a separate issue than the original one you posted so maybe worth opening a separate issue to keep things more organised. To answer your question - looks like the script can't find your gradle files so are you sure you have the correct folder structure? I think it needs to be:

• project root <-- the root of your flutter project
  -- android <-- android project
  -- ios <-- ios project
  -- lib <-- flutter / dart files
  -- unity
  ---- your unity project root

PS please keep this issue open so that @juicycleff can fix the original issue, which is that the unity package is missing the System and UnityEngine imports from NativeApi.cs

[timbotimbo]

The orignal issue with the NativeApi compile errors was fixed in fuw-2022.1.1-v2.unitypackage.

[rmib200]

I'm closing the issue

The orignal issue with the NativeApi compile errors was fixed in fuw-2022.1.1-v2.unitypackage.

[lightlessdays]

Double click on the error. A C# file will open in Visual Studio. Delete all the namespaces from the file and add the following namespaces-

using System;
using UnityEngine;
using UnityEngine.SceneManagement;