Podcast #128: We chat with Kent C Dodds about why he loves React and discuss what life was like in the dark days before Git. Listen now.
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On Android, the notion of a home directory is not visible to the user, and it is designed for only one owner.

But users and groups are used. Each application has its own userid, and it is the job of the application to appropriately secure the data, which may be in the cloud or stored locally,

Security and Permissions | Android Developers