Access FJavaWrapper in Android Runtime Plugin

Development Pipeline & Plugins Plugins
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1

Hi all,

I’m working on a plugin for android and want to access the FJavaWrapper class from my code.

So I inlcude

#include "Android/AndroidJNI.h"

to my cpp file. In the normal compile setting “Development Editor/Win64” all is fine couse the plugin is whitelisted for Android.

But if I try to launch on Android, my plugin is compiled for android again and I got a

fatal error: 'Android/AndroidJNI.h' file not found

And it drives me crazy. I saw the GearVR PlugIn uses the file too, and it looks like that it works. I take a look in there plugin build settings and saw nothing which points to the AndroidJNI.h, or added it to the include dependencies.

What should I do to use the AndroidJNI in specially the FJavaWrapper in my Plugin?

regards

2

Okay I found the issue.

Should add the Privateinclude:

/Source/Runtime/Launch/Private"

3

Hi Hessling,

I’m having the same issue right now. Can you be more specific about your fix?

What did you add exactly to make it work?

A code sample would be great!

Thanks
Robel

4

Hi Robel,

I had to add “/Source/Runtime/Launch/Private” in the private include section of my plugin c# config file. Each source project/plugin has one. But I worked on a plugin which worked on the engine source base and not a precompiled engine from the Epic Game Laucher.

Regard,
Ingo Hessling

5
  1. in the XXX.uplugin file add WhitelistPlatforms": [ “Android”, “Win64” ] to Modules
  2. in the cpp file, add following including files.
    #if PLATFORM_ANDROID
    #include “AndroidPlatform.h”
    #include “Android/AndroidApplication.h”
    #include “Android/AndroidJNI.h”
    #include “Android/AndroidJava.h”
    #endif
  3. in the c++ code, use PLATFORM_ANDROID MACRO to distinguish the java code and C++ platform code
6

Hello. I have the same issue and i didn’t understand your solution. Can you share exactly the include field. I tried include “Android/AndroidJNI.h/Source/Runtime/Launch/Private” but it was wrong

7

Hey, probably the problem is that your code does not see the “Launch” module, which contains the code for calling JNI. You can do it this way:

if (Target.Platform == UnrealTargetPlatform.Android)
{
	PrivateDependencyModuleNames.Add("Launch");
}

You can look at my plugin to see how I did it: Android Native