The ability to lock a device to a single application, introduced in Android 9, restricts user access to other apps and system functions without specific authorization. For instance, if an individual needs to temporarily lend their device for a single task, such as displaying a boarding pass, this functionality ensures the recipient cannot access other data or applications.
This feature enhances device security and user privacy in various scenarios. It proves particularly useful for shared devices in educational or enterprise settings, where limiting app access is desirable. Historically, such granular control over application access required third-party applications, but this built-in Android capability simplifies the process and improves overall system security. Its presence avoids unintentional exposure of sensitive information and promotes focused device usage.
