如何在未经身份验证的Firebase应用程序中添加书签选项？

I'm creating a news application using firebase and I'm fetching data in recyclerView and I want to add bookmark option like when I click on ImageButton or a Button of item of recyclerView then that item will show in activity or Fragment

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我在应用程序中未使用任何类型的身份验证，并且我没有一个主意要执行此操作

提前致谢