android email源码attachment布局文件找不到

在Email的Android.mk文件中

LOCAL_RESOURCE_DIR := $(addprefix $(LOCAL_PATH)/, $(res_dir))
res_dir := $(chips_dir) $(mail_common_dir) res
mail_common_dir := ../../../frameworks/opt/mailcommon/res

所以attachment文件应当在../../../frameworks/opt/mailcommon/res下