Android NDK使用第三库的 Android.mk文件
方式一，直接在Android.mk中构建，但缺陷是重用性不高
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := my-init
LOCAL_SRC_FILES := libinit.so //注意，该文件放在jni目录下
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := hello-jni
LOCAL_SHARED_LIBRARIES := my-init
LOCAL_SRC_FILES := hello-jni.c
include $(BUILD_SHARED_LIBRARY)</span>方式一，将Prebuilt库提前构建，然后在编入Android.mk
参考博客：
http://songyingjian2009.blog.163.com/blog/static/1318302422013327104940727/
http://www.cnblogs.com/satng/archive/2012/06/04/2534934.html
1.在project/jni目录下创建prebuilt子目录(目录名可自定义).
2.将第三方.so放到prebuilt中,并创建Android.mk, 内容如下:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := my_prebuilt
LOCAL_SRC_FILES := libxxx.so
include $(PREBUILT_SHARED_LIBRARY)
3.在project/jni/Android.mk中加入
LOCAL_SHARED_LIBRARIES := my_prebuilt
4.在project/jni/android.mk的最后加入
include $(LOCAL_PATH)/prebuilt/Android.mk
