Accessing C++ library in android without JNI

It's not possible to use C++ without JNI - the point is that JNI *IS* native code, i.e. the very fact that you want to use C++ (or C) means that you are using a native library, within a Java environment => JNI.

Remember that you only need to provide the JNI wrapper code for your API between the two domains: Java and native (C++). Therefore although you might have several tens (even hundreds) of C++ classes/methods, it's most unlikely that all of these need to be exposed at your JNI interface.

Consider this.. somehow you're going to have to transfer those Java method arguments into the C++ world and similarly return results from C++ to Java. You cannot escape from the need to handle this.

Having said all that, if for example you have a large number of required method calls from Java to JNI that have similar method signatures, then you may be able to generalise these. For example you could pass a String identifying the required JNI method along with a variable-length array of objects (or ints, floats, doubles, whatever..). A single JNI method could parse such an argument list and "farm-out" the call to the appropriate C++ class/method, and similarly provide a generic set of return results. This would require more up-front investment to set-up the interface, but once done you could add method calls easily. I would recommend this approach only if you have many JNI interfaces that lend themselves well to such a generalisation. If not, you have no choice other than to start typing!