## How to Stop Your Android App from Draining the Battery with Wake Locks A wake lock is one of the simplest APIs in Android and one of the easiest to misuse. Acquiring one takes a single line of code. Forgetting to release it can keep a phone's CPU awake for hours, drain the battery overnight, and earn your app a warning label on Google Play. Most wake lock bugs aren't caused by a misunderstanding of the API itself. They come from ordinary control flow problems: an exception thrown between acquire() and release(), an early return, a callback that never fires, or a reference count that drifts…