ScreenOnBlockerpublic interface ScreenOnBlocker
|Low-level screen on blocker mechanism which is used to keep the screen off
or the contents of the screen hidden until the window manager is ready to show new content.|
Acquires the screen on blocker.
Prevents the screen from turning on.
Calls to acquire() nest and must be matched by the same number
of calls to release().
Releases the screen on blocker.
Allows the screen to turn on.
It is an error to call release() if the screen on blocker has not been acquired.
The system may crash.