$ vim ~/.bashrc
//----------------- add the following text ----------------------
export NDK_HOME=/home/linx/Software/Android/ndk
export PATH=${NDK_HOME}:$PATH
//------------------------------------------------------------------------
$ source ~/.bashrc

　　4、test the ndk

$ pwd
~/Software/Android/ndk/samples/hello-gl2

$ ndk
 
-build
Compile++ thumb  : gl2jni <= gl_code.cpp
StaticLibrary  : libstdc++.a
SharedLibrary  : libgl2jni.so
Install        : libgl2jni.so => libs/armeabi/libgl2jni.so    

　　the object file is "libs/armeabi/libgl2jni.so"

　　the ndk install success.

　　then add the ndk to IDE.

　　Eclipse :

　　1、download CDT

　　1) offline

http://www.eclipse.org/cdt/downloads.php

　　2) online

Help -> Install New Software

　　add the URL

http://download.eclipse.org/tools/cdt/releases/juno/

　　then the CDT install automatic.

　　2、run ndk-build in the project exist

$ pwd
~/Software/Android/ndk/samples/hello-jni

$ ndk-build

　　3、Import the project first

File -> New -> Project.. -> Android Project from Existing Code

　　browse form the project root directory.

　　4、config the NDK in IDE

　　1) File -> Properties

　　2) builders -> New -> Program -> OK

　　3)in Edit Configuration

Name : hellojni (the project you want to build)

　　Table Main :

Location :
/bin/bash
Working Directory :
/bin
Arguments :
-c "cd ~/Software/Android/ndk/samples/hello-jni/ && ndk-build"

　　Table Refresh :

click on "Refresh resources upon completion."

then choose the "Specific resources"

finally choose the "libs" in "Specific resources" and Finish it 

　　Table Build Options :

click on everything in "Run in builder"

then choose the "Specify Resources"

finally choose the "jni"  in "Specify Resources"

　　Finish.