this is what worked for me:
FILE_LIST := $(wildcard $(LOCAL_PATH)/../../../Classes/*.cpp)
LOCAL_SRC_FILES := hellocpp/main.cpp \
LOCAL_SRC_FILES += $(FILE_LIST:$(LOCAL_PATH)/%=%)
this is what worked for me:
FILE_LIST := $(wildcard $(LOCAL_PATH)/../../../Classes/*.cpp)
LOCAL_SRC_FILES := hellocpp/main.cpp \
LOCAL_SRC_FILES += $(FILE_LIST:$(LOCAL_PATH)/%=%)