Android.mk 和Android.bp 设置头文件的命令
1. Android.mk
LOCAL_C_INCLUDES += \
$(call include-path-for, audio-utils) \
$(call include-path-for, audio-route) \
$(call include-path-for, speex) \
$(LOCAL_PATH)/include 本地目录下包含文件<user_mixer.h>引用
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include 添加头文件到模块的公开API
例：
则user_mixer.h可以直接供user_mixer.c引用，也可以供其它引用此模块的其它文件使作
2.Android.bp
export_include_dirs: ["include"], #有外部包含文件输出 local_include_dirs: ["include"], #本地路径