AudioFocus

A FocusManager takes requests to acquire and release Channels and updates the focuses of other Channels based on their priorities so that the invariant that there can only be one Foreground Channel is held.

An delegate that appllication can extend to register to observe focus changes.

FocusChannelDelegate may be capability agent whose needs to be registered with the ContextManager.

The priority of the channel used by the FocusManager to create Channel objects.

Use a initializer if you want to create priorities directly in application. The predetermined focus channel includes recognition(priority = 300), information(priority = 200) and content(priority = 100).

An enum class used to specify the levels of focus that a Channel can have.