原文链接：http://blog.csdn.net/xiangzilv1987/article/details/16805983
在编写 android.mk 的过程中，免不了要修改 LOCAL_C_INCLUDES 来设置头文件的 include 目录，一般写成这样
LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../Classes \
$(LOCAL_PATH)/../../Classes/game \
$(LOCAL_PATH)/../../Classes/logic \
$(LOCAL_PATH)/../../Classes/view
有一个目录就要写一行，实在繁琐，有没有写法可以把源码目录下的所有子目录都引入呢，看下面
LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../Classes
LOCAL_C_INCLUDES += $(shell ls -FR $(LOCAL_C_INCLUDES) | grep $(LOCAL_PATH)/$ )
LOCAL_C_INCLUDES := $(LOCAL_C_INCLUDES:$(LOCAL_PATH)/%:=$(LOCAL_PATH)/%)
即可把 $(LOCAL_PATH)/../../Classes 目录和子目录全部包含进来
还有一种写法，就是使用 sed 命令，效果是一样的，我对 sed 不是很熟悉，简单写了一下
LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../Classes
LOCAL_C_INCLUDES += $(shell ls -FR $(LOCAL_C_INCLUDES) | grep $(LOCAL_PATH)/$ | sed "s/:/ /g" )
这两行和上面三行的结果是一样的
如果要方便的引入源文件到 android.mk 文件里，可以参考我的这篇 post：
编写Android.mk中的LOCAL_SRC_FILES的终极技巧
以上代码在 mac + NDK r8e 下测试通过