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
