On android this Is done using LRU cache for background app. If your app has a cached process and it retains memory that it currently does not need, then your a

On android this Is done using LRU cache for background app. If your app has a cached process and it retains memory that it currently does not need, then your app—even while the user is not using it— affects the system's overall performance. As the system runs low on memory, it kills processes in the LRU cache beginning with the process least recently used. The system also accounts for processes that hold onto the most memory and can terminate them to free up RAM.