How to kill a 3rd-party application?

Question

My program needs to kill a specific application. Is it possible on a stock, unrooted device? If yes - how? I know its process name and PID.

Answer 1

standing at the doc:

Kill the process with the given PID. Note that, though this API allows us to request to kill any process based on its PID, the kernel will still impose standard restrictions on which PIDs you are actually able to kill. Typically this means only the process running the caller's packages/application and any additional processes created by that app; packages sharing a common UID will also be able to kill each other's processes.

so you can kill your own process..

see the Process documentation. I tried to run adb shell kill pid but it requires super user permission