LoadShader

C++ func which calls a Java method (JNI)
char* loadAsset(const char* path)
{
 jstring _path = (*GET_JAVA_ENV())->NewStringUTF(GET_JAVA_ENV(), path);
 jbyteArray result = (jbyteArray) (*GET_JAVA_ENV())->CallStaticObjectMethod(GET_JAVA_ENV(), GET_ACTIVITY_CLASS(), GET_STATIC_METHOD_ID("getAssetContents","(Ljava/lang/String;)[B"), _path);
 jsize size = (*GET_JAVA_ENV())->GetArrayLength(GET_JAVA_ENV(), result);
 char* data = (char*)calloc((size_t)size, sizeof(char));
 (*GET_JAVA_ENV())->GetByteArrayRegion(GET_JAVA_ENV(), result, (jsize)0, size, (jbyte*)data);
 return data; //data is returned as shader source
}

Java Function which loads shader from android assets
 public byte[] getAssetContents(String path) throws IOException
 {
  InputStream is = assetManager.open(path, AssetManager.ACCESS_BUFFER);
  byte buffer[] = new byte[is.available()];
  is.read(buffer);
  return buffer;
 }