PROTOCOLS
Listener
Defined in fuchsia.ui.activity/provider.fidl
The Listener protocol subscribes to changes in the system's activity state. Clients which care about the activity state of the system are expected to implement this protocol and subscribe via Provider.WatchState.
OnStateChanged
Callback that is invoked whenever the system state changes. The Listener is expected to acknowledge each call explicitly and will not receive new state until this acknowledgement is done.
Request
| Name | Type |
|---|---|
state |
State
|
transition_time |
zx/Time
|
Response
<EMPTY>
Provider
Defined in fuchsia.ui.activity/provider.fidl
The Provider protocol offers a subscription interface through which clients can watch for changes in the system's activity state.
WatchState
Subscribe to changes in the system's state. The server will always invoke listener.OnStateChanged at least once with the initial state, and after that invoke listener.OnStateChanged whenever the system's state changes.
Request
| Name | Type |
|---|---|
listener |
client_end:Listener
|
ENUMS
State strict
Type: uint32
Defined in fuchsia.ui.activity/state.fidl
State is an enumeration of the activity states the system may be in.
| Name | Value | Description |
|---|---|---|
UNKNOWN |
0 |
|
IDLE |
1 |
IDLE implies that the system is not currently being used by a user. In other words, the system is not ACTIVE. |
ACTIVE |
2 |
ACTIVE implies that a user has recently or is currently using the system. Activity can be signalled by discrete interactions (cursor, keyboard, touchscreen), or by ongoing activities (video playback). The specific meaning of "recently" is an implementation detail of the Activity Service, but a typical value is 15 minutes. |
TABLES
GenericActivity
Defined in fuchsia.ui.activity/activity.fidl
GenericActivity is a user or system activity of unspecified type, e.g. a keyboard press or an alarm going off.
| Ordinal | Field | Type | Description |
|---|---|---|---|
1 |
label |
string
|
Brief human-readable label for the activity, for logging/debugging. e.g. "cursor", "key", "video" |
UNIONS
DiscreteActivity flexible
Defined in fuchsia.ui.activity/activity.fidl
DiscreteActivity is an activity which occurs at a point in time.
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 |
generic |
GenericActivity
|
Activities that require no special handling. |
OngoingActivity flexible
Defined in fuchsia.ui.activity/activity.fidl
OngoingActivity is an activity which has a definite start and end time.
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 |
generic |
GenericActivity
|
Activities that require no special handling. |
ALIASES
| Name | Value | Description |
|---|---|---|
| OngoingActivityId |
uint32 |