Some Basic Knowledge on NDK

How to generate wrapper files using swig :

1)Install Swig using the following link
http://www.swig.org/download.html

2)Copy in your folder and from cmd prompt go the location and type the following command
swig -c++ -java path

Where path indicates location of .i file[which is mandatory to generate wrapper classes]

3)Corresponding wrapper classes will be generated and then build using eclipse before building in eclipse  follow the below steps

4)Set Ndk path in window--->preferences --->Android--->Ndk

5)Go to project properties c/c++ build --->Tool chain Editor and there set CurrentBuilder as Android Builder.

6)Navigate to C/C++ build there in Builder Settings following should be mentioned

Build Directory should be : ${workspace_loc:/Project Name}/
Build Command : ndk - build

7)Build will be successful refer make file for any directory mismatch


One of the reason why I faced UnsatisfiedLinkError while trying to call native function is:

I have build JNIWrapper using the followinh Swig command

C:\swig\swigwin-2.0.11\swigwin-2.0.11>swig -c++ -java -package com.sampel D:\Pro
j-workspace\All_Projects\nativecodeproject\jni\API.i

All the wrappers got generated with the above package name.

I had a file with .cxx extension[which serves as a linkage between the Java and the Cpp code]
which plays a primary  role while invoking native functions.
This .cxx file is also generated by swig when I run the above command.

As per the make file Android makefile I shoul copy it and paste it in the target folder.
I missed out the above step and this lead to Error.

Note android make file instructions should be folloed carefully and .cxx file should be placed in their appropriate positions