NDK之对例子two-libs的学习
two-libs:两个库的使用,first为静态库,second为动态库,并且second库调用first库。
Android.mk文件:
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := libtwolib-first
LOCAL_SRC_FILES := first.c
include $(BUILD_STATIC_LIBRARY) //表示编译成静态库
# second lib, which will depend on and include the first one
include $(CLEAR_VARS)
LOCAL_MODULE := libtwolib-second
LOCAL_SRC_FILES := second.c
#引用外部库,这里是引用上面的 libtwolib-first
LOCAL_STATIC_LIBRARIES := libtwolib-first
include $(BUILD_SHARED_LIBRARY) //表示编译成动态库
first.h文件:这文件需要手动生成
#define FIRST_H
extern int first(int x, int y); //表示外部引用此头文件就可以间接获得该头文件对于该方法的实现
#endif
first.c文件:
#include "first.h"
int first(int x, int y)
{
return x + y;
}
second.c文件:
#include "first.h"
#include <jni.h>
jint
Java_com_example_twolibs_TwoLibs_add( JNIEnv* env , jobject this, jint x, jint y )
{
return first(x, y);
}