ObservableWatchData

Kotlin |Java

open class ObservableWatchData<T : Any>

kotlin.Any
↳	androidx.wear.watchface.ObservableWatchData

Known Direct Subclasses

MutableObservableWatchData

ObservableWatchData which publicly exposes setValueT method.

An observable UI thread only data holder class (see Observer).

Summary

Public methods
Unit	`addObserver(observer: Observer<T>)` Adds the given Observer to the observers list.
T	`getValueOr(default: T)` Returns the value contained within this ObservableWatchData or default if there isn't one.
Boolean	`hasValue()` Whether or not this ObservableWatchData contains a value.
Unit	`removeObserver(observer: Observer<T>)` Removes an observer previously added by addObserver.
open String	`toString()`

Properties
open T	`value` The observable value.

Public methods

addObserver

@UiThread fun addObserver(observer: Observer<T>): Unit

Adds the given Observer to the observers list. If hasValue would return true then Observer.onChanged will be called. Subsequently Observer.onChanged will also be called any time value changes. All of these callbacks are assumed to occur on the UI thread.

getValueOr

@UiThread fun getValueOr(default: T): T

Returns the value contained within this ObservableWatchData or default if there isn't one.

hasValue

@UiThread fun hasValue(): Boolean

Whether or not this ObservableWatchData contains a value.

removeObserver

@UiThread fun removeObserver(observer: Observer<T>): Unit

Removes an observer previously added by addObserver.

toString

open fun toString(): String

Properties

value

open var value: T

The observable value.