Excerpt from Google Official Documents
Android Develop API Guides
Principle of Least Privilege
Each app has access only to the components that it requires to do its work and no more. This creates a very secure environment in which an app cannot access parts of the system for which it is not given permission.
Ways for App to Share Data with Other Apps
- arrange for two apps to share the same Linux user ID
- an app can request permission to access device data
