[Android NDK] The way to compile C++ code (JNI) from the command line (common to windows and linux)

1. Suppose the project name is ProjTest, first create a ProjTest folder, and then create two new directories in the ProjTest directory: jni and lib, the final result is as follows:

ProjTest

        |----jni

        |----libs

 

2. Add your C/C++ code to the jni directory. The C code used for the test here is as follows:

test.c 

#include <stdio.h>
#include <stdlib.h>
intmain()
{
     printf("Hello World\n");
     return 0;
}

 

3. Create and edit the Android.mk file in the jni directory. There is only one c code file: test.c, and the corresponding Android.mk is as follows: 

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
# give module name
LOCAL_MODULE    := hello_world  
# list your C files to compile
LOCAL_SRC_FILES := test.c
# this option will build executables instead of building library for android application.
include $(BUILD_EXECUTABLE)

 Because our C code here is an executable program, the configuration is BUILD_EXECUTABLE ,

 

If it is a static library *.a file, use BUILD_STATIC_LIBRARY

If it is a dynamic link library *.so file, use BUILD_SHARED_LIBRARY

For detailed configuration of Android.mk, see: http://aigo.iteye.com/blog/2288694

 

4. Finally, switch the command line to the ProjTest/jni directory, assuming you have set the ndk environment variables, and then execute the command: ndk-build

 

Reference from: https://rathodpratik.wordpress.com/2013/03/24/build-cc-executables-for-android-using-ndk/