在Android.mk自動檢查某檔案是否存在後加入

define prebuilt-app-file-exist
$(shell test -f $(1) && echo "true")
endef

prebuilt_app_exist := $(call prebuilt-app-file-exist, $(LOCAL_PATH)/your_app.apk)

ifeq ($(strip $(prebuilt_app_exist)),true)

$(info Found prebuilt app, appended)

prebuild_apps_list += your_app_module_name

else

$(info Not found prebuilt app)

endif