Bixby Developer Center

Definition and Implementation

You might have instances in your capsule where you need to poll your content provider with updated information, for example if you need to update the contents displayed to your user about some information. In these cases, you can use the refresh reference key in a result-view, input-view, or confirmation-view file to accomplish this.

For example, you might want to create a ride-sharing capsule. In order for users to get live updates of when their ride will arrive, you can update the views with refresh.

refresh {
  if (!exists(this.receipt)) {
    spec {
      delay-seconds (5)
      with-request {
        intent {
          goal: CheckRideShareStatus
          value {$expr(this)}
        }
      }
    }
  }
}

Examples

You can find an example of using refresh in the reference page.

To further expand on the ride-sharing capsule, the refresh key is declared in a result-view file:

//Activity.view.bxb
result-view {
  match {
    Activity (this)
  }
  refresh {
    if (!exists(this.receipt)) {
      spec {
        delay-seconds (5)
        with-request {
          intent {
            goal: CheckRideShareStatus
            value {$expr(this)}
          }
        }
      }
    }
  }
  conversation-drivers {
    if ("this.status == 'Requested' || this.status == 'Confirmed'") {
      conversation-driver {
        template ("Cancel my Uber ride")
      }
    }
  }
  render {
    layout-match (this) {
      mode (Details)
    }
  }
}

The capsule uses a transactional workflow. This Activity.view.bxb file displays to users the details of the ride-share status. After showing the initial results, if the transaction has moved to the activity state, then the view will refresh. Once the ride is over, which is checked with the condition by the existence of a receipt, then the refresh will stop. Otherwise, if the condition is met, then every 5 seconds, the view is updated. The delay handles how often the view is refreshed. The on-refresh has an intent to execute during each refresh interval. It calls the CheckRideShareStatus, which is of the RefreshActivity type.

action (CheckRideShareStatus) {

  type (RefreshActivity)

  collect {
    input(activity){
      type (Activity)
      min (Optional)
    }
    input(imaginary) {
      type (Imaginary)
      min (Optional)
    }
  }

  output (Activity) {
    throws {
      error (NoCurrentTrip) {
        on-catch {
          halt {
            dialog { 
              template ("You don't seem to be on a ride.")
            }
          }
        }
      }
    }
  }
}

Once the ride is over, which is checked with the condition by the existence of a receipt, the refresh will stop.

To learn more about how to use Activity Cards to update users during Refresh Activity, see Giving Updates with Activity Cards.