Observable (Data Binding Base Library)

```
public interface Observable
```
Observable classes provide a way in which data bound UI can be notified of changes. ObservableList and ObservableMap also provide the ability to notify when changes occur. ObservableField, ObservableParcelable, ObservableBoolean, ObservableByte, ObservableShort, ObservableInt, ObservableLong, ObservableFloat, and ObservableDouble provide a means by which properties may be notified without implementing Observable.
An Observable object should notify the Observable.OnPropertyChangedCallback whenever an observed property of the class changes.
The getter for an observable property should be annotated with Bindable.
Convenience class BaseObservable implements this interface and PropertyChangeRegistry can help classes that don't extend BaseObservable to implement the listener registry.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static class Observable.OnPropertyChangedCallback
The callback that is called by Observable when an observable property has changed.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`addOnPropertyChangedCallback(Observable.OnPropertyChangedCallback callback)`	Adds a callback to listen for changes to the Observable.
`void`	`removeOnPropertyChangedCallback(Observable.OnPropertyChangedCallback callback)`	Removes a callback from those listening for changes.

- Method Detail
  - addOnPropertyChangedCallback
```
void addOnPropertyChangedCallback(Observable.OnPropertyChangedCallback callback)
```
    Adds a callback to listen for changes to the Observable.
    
    Parameters:
    
    callback - The callback to start listening.
  - removeOnPropertyChangedCallback
```
void removeOnPropertyChangedCallback(Observable.OnPropertyChangedCallback callback)
```
    Removes a callback from those listening for changes.
    
    Parameters:
    
    callback - The callback that should stop listening.