I am setting a wake lock using wl.acquire(). This works fine. I need that wake lock as long as my application lives, so calling release() can only be done when the application is left.
Do I have to call release() somewhere? For example in onStop()? I would say no, but I am not sure.
Beside the others useful answers you already received, I just found this interesting answer about how to force screen on, maybe you'll find it useful too, if you don't really need a wake lock.