I'd like to ask you a simple question about the sensor at the end of Android.

Android systems attempt to maintain application processes internally for as long as possible. The reason why there are callback functions related to the life cycle in the components provided by Android also means that the Android system directly manages their life. Therefore, it is best practice for developers to delegate this to Android and write predictable code using the callback function rather than directly terminating the process. I think you'll have to rethink why you have to shut down the process yourself and whether this is the only solution.

Apart from that, registerListener/unregisterListener to receive sensor values always calling in pairs can prevent memory leaks and create flawless code.