Integration Unity as a library in native Android app

There is a problem with this example: the unload buttons actually quit the app instead of just destroying the activity. (tested on Android 5.1, API level 22)

 

We have observed that when the UnityPlayerActivity hosting the UnityPlayer object is destroyed, the UnityPlayer calls Process.killProcess(myPid) as part of it's destroy() method. This causes our application to crash and restart since UnityPlayerActivity shares the same process as the application. Is there workaround for this behavior? We do not want to run the the UnityPlayerActivity as a separate process since makes integration with our application much more complicated. Can Unity add support for both types of activities? This would make the Unity library feature much more usable by a wide variety of Android applications, which we believe is the goal of this feature.

 

We have filed a bug report for the Unity Player crashing when performing 'Unload' in the NativeApp since the UnityPlayerActivity calls Process.killProcess instead of exiting cleanly: Case 1163573

 

Tried this out right now and it seems to work great!
One weird thing I noticed... I see two "NativeApp" apps installed on my test android device when I build / deploy the NativeApp project from AndroidStudio.

When I tap on one of them, it launches the Native app correctly and I can go back and forth between Unity and the Android view. But if I launch the other NativeApp app, it launches me straight into the Unity view (i.e. with the spinning cube) and skips the whole Native app layer (obviously, I don't see the native buttons in the middle as well). If I click on the Unity button to take me back to the MainView, I get a NullReference in showHostMainWindow probably beacuse the Main View does not even exist.

Dev / Test environment: Pixel 2 XL running Android 9 pie. I think I built both the UnityLibrary and the NativeApp using SDK API 28 (Pie). Not sure if this is related but when I tried to do the Gradle sync, after modifying the gradle scripts, it complained that the minSDK version of the NativeApp project was 16 while the minSDK version of the UnityLibrary was 19. So, I changed the NativeApp minSDK value to 19 to get it to build / deploy

Did I mess something up? Or is it expected that two apps get installed on the device, one native app and another the UnityLibrary?

 

Hi,

nice to see such a feature coming with Unity. Also a very nice and detailed explanation, thanks for that.
However I wanted to mention that I had to add a string to my strings.xml with name game_view_content_description in order to get it running.
If the string was not defined the UnityActivity crashed when starting it.

Thought I leave it here in case someone faces the same issue.

 

It got me too - hopefully this is in big, bold letters in the documentation. ;P

 

Any plans to add iOS support in the same way?

 

@robin_notts
I didn't try yet but iOS should already be supported, see https://forum.unity.com/threads/integration-unity-as-a-library-in-native-ios-app.685219/

 

Thanks for this integration.

To make it work on my own project, I needed in addition to add

<string name="game_view_content_description">Game view</string>

to my app's strings.xml file

and

Code (CSharp):

1. defaultConfig {
2.         ndk {
3.             abiFilters 'armeabi-v7a', 'x86'
4.         }
5.     }

to my app build.gradle file.
Otherwise, the app crashed with following error :

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mycompany.myapp/com.unity3d.player.UnityPlayerActivity}: android.content.res.Resources$NotFoundException: String resource ID #0x0

 

Not sure if this is the place to ask, but where could I find more information about combining this with AR Foundation? (supposedly one of the use-cases of Unity as a library). I managed to put my own game into the example app provided here without encountering any problems, but I'm now trying to put the AR example explained here: https://www.youtube.com/embed/ml9qVRdEH4k into the android app and I'm encountering the following error:

ERROR: Unable to resolve dependency for ':unityLibrary@debug/compileClasspath': Could not find :arcore_client:

Can anyone here give me any guidance on how to fix this, or what to google?

EDIT:

I managed to resolve the error by changing:
The dependencies in unityLibrary's build.gradle to

Code (CSharp):

1. dependencies {
2.     implementation fileTree(dir: 'libs', include: ['*.jar'])
3.     compile files('libs/arcore_client.aar')
4.     compile files('libs/unityandroidpermissions.aar')
5.     compile files('libs/UnityARCore.aar')
6. }

Now it compiles can open the app, but crashes on pressing the show unity button with the following error

No implementation found for void com.unity3d.player.UnityPlayer.nativeRestartActivityIndicator() (tried Java_com_unity3d_player_UnityPlayer_nativeRestartActivityIndicator and Java_com_unity3d_player_UnityPlayer_nativeRestartActivityIndicator__)

EDIT:

Switching to IL2CCP, and turning off Instant Run in Android Studio resolves all error and lets me use launch the AR Core example, very nice.

 

I only want to use Audio of Unity in Delphi. Will it be possible with Unity 2019.3a2 to compile a library that I can use in an Android project for Delphi? And IOS? And which banner of Unity will I have to include with the Community edition?

 

Hi, I tested the example project and it worked correctly.

Now I'm testing a Unity project with Vuforia exported as an Android Library, and I can't make it work.

When I launch it from an Android Project it crashes.

2019-07-31 12:10:53.171 17975-17975/com.unity.mynativeapp E/Unity: Unable to find main

2019-07-31 12:10:53.209 17975-17975/com.unity.mynativeapp I/HwPointEventFilter: do not support AFT because of no config

2019-07-31 12:10:53.226 17975-17975/com.unity.mynativeapp E/art: No implementation found for void com.unity3d.player.UnityPlayer.nativeRestartActivityIndicator() (tried Java_com_unity3d_player_UnityPlayer_nativeRestartActivityIndicator and Java_com_unity3d_player_UnityPlayer_nativeRestartActivityIndicator__)

2019-07-31 12:10:53.228 17975-17975/com.unity.mynativeapp E/AndroidRuntime: FATAL EXCEPTION: main

    Process: com.unity.mynativeapp, PID: 17975

Has anyone tried to use a Vuforia Project as a Library?, if so what's missing?

Thanks.

 

I am working with XCode. Can you provide an example for this, please?

 

Can you provide an example for Unity Integration with Swift?

 

ERROR: Unable to resolve dependency for ':unityLibrary@debug/compileClasspath': Could not find :android_component:.
Show Details
Affected Modules: unityLibrary


ERROR: Failed to resolve: :core-1.1.0:
Affected Modules: unityLibrary


ERROR: Unable to resolve dependency for ':unityLibrary@debug/compileClasspath': Could not find :unity_android_bridge:.
Show Details
Affected Modules: unityLibrary


ERROR: Unable to resolve dependency for ':unityLibrary@debugAndroidTest/compileClasspath': Could not find :android_component:.
Show Details
Affected Modules: unityLibrary


ERROR: Unable to resolve dependency for ':unityLibrary@debugAndroidTest/compileClasspath': Could not find :unity_android_bridge:.
Show Details
Affected Modules: unityLibrary


ERROR: Unable to resolve dependency for ':unityLibrary@debugUnitTest/compileClasspath': Could not find :android_component:.
Show Details
Affected Modules: unityLibrary


ERROR: Unable to resolve dependency for ':unityLibrary@debugUnitTest/compileClasspath': Could not find :unity_android_bridge:.
Show Details
Affected Modules: unityLibrary


ERROR: The minSdk version should not be declared in the android manifest file. You can move the version from the manifest to the defaultConfig in the build.gradle file.
Remove minSdkVersion and sync project
Affected Modules: unityLibrary


WARNING: The targetSdk version should not be declared in the android manifest file. You can move the version from the manifest to the defaultConfig in the build.gradle file.
Remove targetSdkVersion and sync project
Affected Modules: unityLibrary


I got this errror while adding my game scene

 

For me, the problem occurred while integrated the AR Camera(Wikitude)

 

Tried using Wikitude not working

 

I am getting this error while integrating Wikitude camera.
Please help me to solve this error


ERROR: Unable to resolve dependency for ':unityLibrary@debug/compileClasspath': Could not find :android_component:.
Show Details
Affected Modules: unityLibrary


ERROR: Failed to resolve: :core-1.1.0:
Affected Modules: unityLibrary


ERROR: Unable to resolve dependency for ':unityLibrary@debug/compileClasspath': Could not find :unity_android_bridge:.
Show Details
Affected Modules: unityLibrary

 

Hey, how's it going!

Trying to build the project using il2cpp. Hoping to build it in ARM64.

I'm getting a clang linker error both when building the project normally and when exporting the project:

Code (CSharp):

1. Failed running D:\Program Files\Unity Editors\2019.3.0a11\Editor\Data\il2cpp/build/il2cpp.exe --convert-to-cpp --emit-null-checks --enable-array-bounds-check --dotnetprofile="unityaot" --compile-cpp --libil2cpp-static --platform="Android" --architecture="ARMv7" --configuration="Release" --outputpath="D:\Users\TylerOBrien\Downloads\UnityProject\UnityProject\Temp\StagingArea\assets\bin\Data\Native\armeabi-v7a\libil2cpp.so" --cachedirectory="D:\Users\TylerOBrien\Downloads\UnityProject\UnityProject\Assets\..\Library\il2cpp_android_armeabi-v7a/il2cpp_cache" --additional-include-directories="D:/Program Files/Unity Editors/2019.3.0a11/Editor/Data/PlaybackEngines/AndroidPlayer/Tools\bdwgc/include" --additional-include-directories="D:/Program Files/Unity Editors/2019.3.0a11/Editor/Data/PlaybackEngines/AndroidPlayer/Tools\libil2cpp/include" --tool-chain-path="D:/Program Files/Unity Editors/2019.3.0a11/Editor/Data/PlaybackEngines/AndroidPlayer/NDK" --profiler-report --map-file-parser="D:/Program Files/Unity Editors/2019.3.0a11/Editor/Data/Tools/MapFileParser/MapFileParser.exe" --directory=D:/Users/TylerOBrien/Downloads/UnityProject/UnityProject/Temp/StagingArea/assets/bin/Data/Managed --generatedcppdir=D:/Users/TylerOBrien/Downloads/UnityProject/UnityProject/Temp/StagingArea/Il2Cpp/il2cppOutput
2.  
3. stdout:
4. Building libil2cpp.so with AndroidToolChain
5.     Output directory: D:\Users\TylerOBrien\Downloads\UnityProject\UnityProject\Temp\StagingArea\assets\bin\Data\Native\armeabi-v7a
6.     Cache directory: D:\Users\TylerOBrien\Downloads\UnityProject\UnityProject\Library\il2cpp_android_armeabi-v7a\il2cpp_cache
7. ObjectFiles: 132 of which compiled: 0
8. Total compilation time: 79 milliseconds.
9. il2cpp.exe didn't catch exception: Unity.IL2CPP.Building.BuilderFailedException: D:\Program Files\Unity Editors\2019.3.0a11\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++ @"C:\Users\tyler\AppData\Local\Temp\tmpF98D.tmp" -o "D:\Users\TylerOBrien\Downloads\UnityProject\UnityProject\Library\il2cpp_android_armeabi-v7a\il2cpp_cache\linkresult_2256FF963E93D278D258DA3E8A9F404D\libil2cpp.so" -shared -Wl,-soname,libil2cpp.so -Wl,--no-undefined -Wl,-z,noexecstack -Wl,--gc-sections -Wl,--build-id --sysroot "D:\Program Files\Unity Editors\2019.3.0a11\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\platforms\android-19\arch-arm" -gcc-toolchain "D:\Program Files\Unity Editors\2019.3.0a11\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64" -target armv7-none-linux-androideabi -Wl,--wrap,sigaction -nostdlib++ -L "D:\Program Files\Unity Editors\2019.3.0a11\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\sources\cxx-stl\llvm-libc++\libs\armeabi-v7a" -lc++_static -lc++abi -landroid_support -lunwind -latomic -llog -rdynamic -fuse-ld=bfd.exe
10.  
11. D:/Users/TylerOBrien/Downloads/UnityProject/UnityProject/Library/il2cpp_android_armeabi-v7a/il2cpp_cache/8303688318A74DF748FF32B5F88E6CAE.o: In function `NativeAPI_showHostMainWindow_m9D8062DCC54A7E64E4F087FCACBE68872F8D1497':
12. D:\Users\TylerOBrien\Downloads\UnityProject\UnityProject\Temp\StagingArea\Il2Cpp\il2cppOutput/Assembly-CSharp.cpp:1672: undefined reference to `showHostMainWindow'
13. clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
14.  
15.  
16.   at Unity.IL2CPP.Building.CppProgramBuilder.PostprocessObjectFiles(HashSet`1 objectFiles, CppToolChainContext toolChainContext)
17.   at Unity.IL2CPP.Building.CppProgramBuilder.Build(IBuildStatistics& statistics)
18.   at il2cpp.Program.DoRun(String[] args)
19.   at il2cpp.Program.Run(String[] args)
20.   at il2cpp.Program.Main(String[] args)
21. stderr:
22.  
23. Unhandled Exception: Unity.IL2CPP.Building.BuilderFailedException: D:\Program Files\Unity Editors\2019.3.0a11\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++ @"C:\Users\tyler\AppData\Local\Temp\tmpF98D.tmp" -o "D:\Users\TylerOBrien\Downloads\UnityProject\UnityProject\Library\il2cpp_android_armeabi-v7a\il2cpp_cache\linkresult_2256FF963E93D278D258DA3E8A9F404D\libil2cpp.so" -shared -Wl,-soname,libil2cpp.so -Wl,--no-undefined -Wl,-z,noexecstack -Wl,--gc-sections -Wl,--build-id --sysroot "D:\Program Files\Unity Editors\2019.3.0a11\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\platforms\android-19\arch-arm" -gcc-toolchain "D:\Program Files\Unity Editors\2019.3.0a11\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64" -target armv7-none-linux-androideabi -Wl,--wrap,sigaction -nostdlib++ -L "D:\Program Files\Unity Editors\2019.3.0a11\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\sources\cxx-stl\llvm-libc++\libs\armeabi-v7a" -lc++_static -lc++abi -landroid_support -lunwind -latomic -llog -rdynamic -fuse-ld=bfd.exe
24.  
25. D:/Users/TylerOBrien/Downloads/UnityProject/UnityProject/Library/il2cpp_android_armeabi-v7a/il2cpp_cache/8303688318A74DF748FF32B5F88E6CAE.o: In function `NativeAPI_showHostMainWindow_m9D8062DCC54A7E64E4F087FCACBE68872F8D1497':
26. D:\Users\TylerOBrien\Downloads\UnityProject\UnityProject\Temp\StagingArea\Il2Cpp\il2cppOutput/Assembly-CSharp.cpp:1672: undefined reference to `showHostMainWindow'
27. clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
28.  
29.  
30.   at Unity.IL2CPP.Building.CppProgramBuilder.PostprocessObjectFiles(HashSet`1 objectFiles, CppToolChainContext toolChainContext)
31.   at Unity.IL2CPP.Building.CppProgramBuilder.Build(IBuildStatistics& statistics)
32.   at il2cpp.Program.DoRun(String[] args)
33.   at il2cpp.Program.Run(String[] args)
34.   at il2cpp.Program.Main(String[] args)
35.  
36. UnityEngine.Debug:LogError(Object)
37. UnityEditorInternal.Runner:RunProgram(Program, String, String, String, CompilerOutputParserBase)
38. UnityEditorInternal.Runner:RunManagedProgram(String, String, String, CompilerOutputParserBase, Action`1)
39. UnityEditorInternal.IL2CPPBuilder:RunIl2CppWithArguments(List`1, Action`1, String)
40. UnityEditorInternal.IL2CPPBuilder:ConvertPlayerDlltoCpp(Il2CppBuildPipelineData, String, String, Boolean)
41. UnityEditorInternal.IL2CPPBuilder:Run()
42. UnityEditorInternal.IL2CPPUtils:RunIl2Cpp(String, String, IIl2CppPlatformProvider, Action`1, RuntimeClassRegistry)
43. UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
44.  

 

I filed a bug report with the project: fogbugz.unity3d.com/default.asp?1174809_ebr3sj4eac6ar72r.

 

Can we send data/message from Unity Activity to Android Activity and vice-versa..
use case : I have created a product selection page in Unity and when user clicks on a submit button, send the details to Android Activity class?

 

Fresh project on MacOS High Sierra and hitting

Invalid build path

with

UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Note: iOS plugin works flawless. Have never run into this issue before. I'm building with the unchange Unity project provided. Similar thread without resolution: https://forum.unity.com/threads/unityengine-guiutility-processevent-int32-intptr.514797/

Update: I'm able to export to an external drive, but still interested in why my main drive doesn't support the export (I've tried exporting to many locations, including the top level "/"). Permissions _shouldn't_ be a problem since I've never had trouble with Unity writing to my drive before. Perhaps it's a case-sensitivity issue? Using Apple's apfs as the filesystem type.

 

The problem is in the Cube.cs script. Comment out the contents of the NativeAPI class when building to Android:

//[DllImport("__Internal")]
//public static extern void showHostMainWindow(string lastStringColor);

Better yet, pop some compile guards around it for IOS only. (See further down in the same script for an example of how to do the compile guard for iOS)

 

EDIT:

Switching to IL2CCP, and turning off Instant Run in Android Studio resolves all error and lets me use launch the AR Core example, very nice.[/QUOTE]

----------------
Hello @aStrangeLoop ,

Would you be able to share your working ARCore/Unity/NativeAndroid project? I am still getting the "No implementation found for void com.unity3d.player.UnityPlayer.nativeRestartActivityIndicator()" error even after switching to IL2CPP and turning off Instatnt Run