The Android operating system has been locked down so that applications have limited capability to adversely affect operations outside their process space. Instead, Android applications run within the bubble of their own virtual machine, with their own Linux user account (and related permissions).
Android applications have no permissions by default. Instead, any permissions for shared resources or privileged access—whether it's shared data, such as the Contacts database, or access to underlying hardware, such as the built-in camera—must be explicitly registered within the Android manifest file. These permissions are granted when the application is installed.
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