The callback that is invoked when the app is put into the background.
typedef void(* background_callback)(void *callback_data);
An app is put into the background whenever it no longer occupies the entire screen. An app is put into the background when:
- the user puts the app into a thumbnail
- the user switches to another app
- an idle timeout occurs causing the device to go into standby mode
Last modified: 2013-09-30