Hello NDK

Source Code Link: https://github.com/JohnnyIqbal/NDKHello
Please add appcompat library to run this project

This is my First NDKHello Demo project for newbies

Create Simple Android Application Project.
then

1. Create NativeLib.java file

2. Open terminal and head to project directory

 cd bin/classes and  

generate header files of NativeLib.java using this command

  javah -jni com.iqbal.ndkhello.ndk.NativeLib  

3. Copy NativeLib.h file in jni folder (Create if not exist in project root)
or you can use this command

  javah -jni -o ../../jni/NativeLib.h com.iqbal.ndkhello.ndk.NativeLib  

4. Create NativeLib.c file and copy method signature in NativeLib.c
and don't foreget to include NativeLib.h

Method Signature eg:

 JNIEXPORT jstring JNICALL Java_com_iqbal_ndkhello_ndk_NativeLib_getHello  
 (JNIEnv *, jclass);  

this is the declared method in header files and change to method defination

  #include"NativeLib.h"  
 JNIEXPORT jstring JNICALL Java_com_iqbal_ndkhello_ndk_NativeLib_getHello  
  (JNIEnv *env, jclass clz){  
  return (*env)->NewStringUTF(env,"Hello World");  
 }  

Note:NewStringUTF sometimes this function shows error means red line to suppress this error please update your CDT.

5.Now create Android.mk file and write these lines

 LOCAL_PATH := $(call my-dir)  
 include $(CLEAR_VARS)  
 LOCAL_MODULE := hello  
 LOCAL_SRC_FILES := NativeLib.c  
 include $(BUILD_SHARED_LIBRARY)  

6.Create Application.mk to suppress the Warnning or error android-19 is larger than minsdkversion 8....
and write this lines

 APP_PLATFORM:=android-8  

Note:android-8 is my minsdkversion so be sure about this change according to minsdkversion in AndroidManifest.xml

7.Open terminal head to project root and fire this command

 ndk-build  

8. Now run your Android NDKHello Project.

Reference:
http://www.ntu.edu.sg/home/ehchua/programming/android/Android_NDK.html