Android - 如何在整个应用程序生命周期中使用ORMLite dbhelper

I'd like to use ORMLite, but I don't like I have manage 1 database helper for each activity. Wouldn't be better to have one for whole app lifecycle? Until now I've used greendao and it has not this issue.I'd like to use ORMLite, but I don't like I hav