So I'm creating an Android app that uses Unity ... I am getting some assetbundle from Unity but I do not know the url before Unity starts. Thus Unity needs to call a function on the Native (Android) side to get the url.

I have been lost for awhile on how to do this (the Unity documentation is quite terrible imho). I decided to use the NDK to help me out. Without Unity everything about my library file works out... now the issue is calling these C functions in Unity.

Here is my lib:

 #include <jni.h>  

include

include

define DEBUG_TAG "NDK_blahy"

 extern "C" {
     jstring Java_com_blah_blah_getURL(JNIEnv * env, jobject this);
     void Java_com_blah_blah_setURL(JNIEnv * env, jobject this, jstring URL);  
 }
 
 jstring url;
  

void Java_com_blah_blah_setURL(JNIEnv * env, jobject this, jstring URL)
{
url = URL;

 jboolean isCopy;  
 const char * szLogThis = (*env)->GetStringUTFChars(env, URL, &isCopy);  
  
 __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK:LC: [%s]", szLogThis);  
  
 (*env)->ReleaseStringUTFChars(env, URL, szLogThis);  

}

 jstring Java_com_lyfelotto_blah_blah_getURL(JNIEnv * env, jobject this)  

{
return url;
}

My unity code loads the library just fine (using [DllImport ("libname")]).

Now, if I load the function "correctly" like this private static extern jstring Java_com_lyfelotto_blah_blah_getURL(JNIEnv * env, jobject this) bad things happen

Have I gone about this the wrong way? (Like I said, all I need to do is get a string). Any ideas?