DeviceReference is an API abstraction that lets you supply a device
argument to a method using one of the following identifier types:
- A numeric API resource ID.
- Real-world hardware IDs, such as IMEI number, belonging to the manufactured device.
Methods that operate on devices take a
DeviceReference as a parameter type
because it's more flexible for the caller. To learn more about device
identifiers, read Identifiers.
) → Map< String, Object>
Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
) → String
Returns a string representation of this object.
dynamic other) → bool
The equality operator.