很多時候項目裏面會用到aidl，爲了能編譯到系統必然會用到Android.mk。
編譯包含aidl文件的需要加入下面兩句，否則編譯通過導入也會報錯。
=====================================Android.mk===================================================
#<Gen Software>
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_PACKAGE_NAME := RtcServerDemo
LOCAL_MODULE_TAGS := optional
LOCAL_CERTIFICATE := platform
LOCAL_SRC_FILES := \
$(call all-java-files-under, src)
LOCAL_SRC_FILES := $(call all-subdir-java-files)
LOCAL_SRC_FILES += $(call all-Iaidl-files-under, src/com/gunti/supply)
include $(BUILD_PACKAGE)
=====================================Android.mk===================================================
