# ObservableLong

Summary:[Inherited Constants](https://developer.android.com/reference/android/databinding/ObservableLong#inhconstants)\|[Fields](https://developer.android.com/reference/android/databinding/ObservableLong#lfields)\|[Ctors](https://developer.android.com/reference/android/databinding/ObservableLong#pubctors)\|[Methods](https://developer.android.com/reference/android/databinding/ObservableLong#pubmethods)\|[Inherited Methods](https://developer.android.com/reference/android/databinding/ObservableLong#inhmethods)\|[\[Expand All\]](https://developer.android.com/reference/android/databinding/ObservableLong#)  

# ObservableLong

`
public


class
ObservableLong
`  
`


``

extends `[BaseObservable](https://developer.android.com/reference/android/databinding/BaseObservable)`


``


implements

`[Parcelable](http://developer.android.com/reference/android/os/Parcelable.html)`,

`[Serializable](http://developer.android.com/reference/java/io/Serializable.html)`


`

|---|---|------------------------------------|
| [java.lang.Object](http://developer.android.com/reference/java/lang/Object.html) |||
| ↳ | [android.databinding.BaseObservable](https://developer.android.com/reference/android/databinding/BaseObservable) ||
|   | ↳ | android.databinding.ObservableLong |

<br />

*** ** * ** ***

An observable class that holds a primitive long.

Observable field classes may be used instead of creating an Observable object. It can also create a calculated field, depending on other fields:  

    public class MyDataObject {
         public final ObservableLong friendCount = new ObservableLong();
         public final ObservableLong familyCount = new ObservableLong();
         public final ObservableLong knownCount = new ObservableLong(friendCount, familyCount) {
             @Override
             public long get() { return friendCount.get() + familyCount.get(); }
         };
     }

Fields of this type should be declared final because bindings only detect changes in the field's value, not of the field itself.

This class is parcelable and serializable but callbacks are ignored when the object is parcelled / serialized. Unless you add custom callbacks, this will not be an issue because data binding framework always re-registers callbacks when the view is bound. A parceled ObservableLong will lose its dependencies.

## Summary

|                                                                                                                                                                      ### Inherited constants                                                                                                                                                                      |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [![](https://developer.android.com/static/assets/images/styles/disclosure_down.png)](https://developer.android.com/reference/android/databinding/ObservableLong#)From interface` android.os.Parcelable ` |-------|----------------------------------------| | `int` | `CONTENTS_FILE_DESCRIPTOR` <br />      | | `int` | `PARCELABLE_WRITE_RETURN_VALUE` <br /> | |

|                                                                                                                                                     ### Fields                                                                                                                                                      ||
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------|
| ` public static final `[Creator](http://developer.android.com/reference/android/os/Parcelable.Creator.html)`<`[ObservableLong](https://developer.android.com/reference/android/databinding/ObservableLong)`>` | [CREATOR](https://developer.android.com/reference/android/databinding/ObservableLong#CREATOR) <br /> |

|                                                                                                                                                 ### Public constructors                                                                                                                                                  ||
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---|
| ` `[ObservableLong](https://developer.android.com/reference/android/databinding/ObservableLong#ObservableLong(long))`(long value) ` Creates an ObservableLong with the given initial value.                                                                                                                           |
| ` `[ObservableLong](https://developer.android.com/reference/android/databinding/ObservableLong#ObservableLong())`() ` Creates an ObservableLong with the initial value of`0L`.                                                                                                                                        |
| ` `[ObservableLong](https://developer.android.com/reference/android/databinding/ObservableLong#ObservableLong(android.databinding.Observable...))`(`[Observable...](https://developer.android.com/reference/android/databinding/Observable)` dependencies) ` Creates an ObservableLong that depends on`dependencies`. |

|                                                                                                             ### Public methods                                                                                                              ||
|---------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` int`  | ` `[describeContents](https://developer.android.com/reference/android/databinding/ObservableLong#describeContents())`() `                                                                                                          |
| ` long` | ` `[get](https://developer.android.com/reference/android/databinding/ObservableLong#get())`() `                                                                                                                                    |
| ` void` | ` `[set](https://developer.android.com/reference/android/databinding/ObservableLong#set(long))`(long value) ` Set the stored value.                                                                                                |
| ` void` | ` `[writeToParcel](https://developer.android.com/reference/android/databinding/ObservableLong#writeToParcel(android.os.Parcel, int))`(`[Parcel](http://developer.android.com/reference/android/os/Parcel.html)` dest, int flags) ` |

| ### Inherited methods |
|-----------------------|---|
| [![](https://developer.android.com/static/assets/images/styles/disclosure_down.png)](https://developer.android.com/reference/android/databinding/ObservableLong#)From class` `[android.databinding.BaseObservable](https://developer.android.com/reference/android/databinding/BaseObservable)` ` |---------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` void` | ` `[addOnPropertyChangedCallback](https://developer.android.com/reference/android/databinding/BaseObservable#addOnPropertyChangedCallback(android.databinding.Observable.OnPropertyChangedCallback))`(`[Observable.OnPropertyChangedCallback](https://developer.android.com/reference/android/databinding/Observable.OnPropertyChangedCallback)` callback) ` Adds a callback to listen for changes to the Observable.   | | ` void` | ` `[notifyChange](https://developer.android.com/reference/android/databinding/BaseObservable#notifyChange())`() ` Notifies listeners that all properties of this instance have changed.                                                                                                                                                                                                                                 | | ` void` | ` `[notifyPropertyChanged](https://developer.android.com/reference/android/databinding/BaseObservable#notifyPropertyChanged(int))`(int fieldId) ` Notifies listeners that a specific property has changed.                                                                                                                                                                                                              | | ` void` | ` `[removeOnPropertyChangedCallback](https://developer.android.com/reference/android/databinding/BaseObservable#removeOnPropertyChangedCallback(android.databinding.Observable.OnPropertyChangedCallback))`(`[Observable.OnPropertyChangedCallback](https://developer.android.com/reference/android/databinding/Observable.OnPropertyChangedCallback)` callback) ` Removes a callback from those listening for changes. | ||
| [![](https://developer.android.com/static/assets/images/styles/disclosure_down.png)](https://developer.android.com/reference/android/databinding/ObservableLong#)From class` `[java.lang.Object](http://developer.android.com/reference/java/lang/Object.html)` ` |------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------| | ` `[Object](http://developer.android.com/reference/java/lang/Object.html)          | ` clone() `                                                                               | | ` boolean`                                                                         | ` equals(`[Object](http://developer.android.com/reference/java/lang/Object.html)` arg0) ` | | ` void`                                                                            | ` finalize() `                                                                            | | ` final `[Class](http://developer.android.com/reference/java/lang/Class.html)`<?>` | ` getClass() `                                                                            | | ` int`                                                                             | ` hashCode() `                                                                            | | ` final void`                                                                      | ` notify() `                                                                              | | ` final void`                                                                      | ` notifyAll() `                                                                           | | ` `[String](http://developer.android.com/reference/java/lang/String.html)          | ` toString() `                                                                            | | ` final void`                                                                      | ` wait(long arg0, int arg1) `                                                             | | ` final void`                                                                      | ` wait(long arg0) `                                                                       | | ` final void`                                                                      | ` wait() `                                                                                | ||
| [![](https://developer.android.com/static/assets/images/styles/disclosure_down.png)](https://developer.android.com/reference/android/databinding/ObservableLong#)From interface` `[android.databinding.Observable](https://developer.android.com/reference/android/databinding/Observable)` ` |------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` abstract void` | ` `[addOnPropertyChangedCallback](https://developer.android.com/reference/android/databinding/Observable#addOnPropertyChangedCallback(android.databinding.Observable.OnPropertyChangedCallback))`(`[Observable.OnPropertyChangedCallback](https://developer.android.com/reference/android/databinding/Observable.OnPropertyChangedCallback)` callback) ` Adds a callback to listen for changes to the Observable.   | | ` abstract void` | ` `[removeOnPropertyChangedCallback](https://developer.android.com/reference/android/databinding/Observable#removeOnPropertyChangedCallback(android.databinding.Observable.OnPropertyChangedCallback))`(`[Observable.OnPropertyChangedCallback](https://developer.android.com/reference/android/databinding/Observable.OnPropertyChangedCallback)` callback) ` Removes a callback from those listening for changes. | ||
| [![](https://developer.android.com/static/assets/images/styles/disclosure_down.png)](https://developer.android.com/reference/android/databinding/ObservableLong#)From interface` `[android.os.Parcelable](http://developer.android.com/reference/android/os/Parcelable.html)` ` |------------------|-------------------------------------------------------------------------------------------------------------| | ` abstract int`  | ` describeContents() `                                                                                      | | ` abstract void` | ` writeToParcel(`[Parcel](http://developer.android.com/reference/android/os/Parcel.html)` arg0, int arg1) ` | ||

## Fields

### CREATOR

```
Creator<ObservableLong> CREATOR
```

<br />

<br />

## Public constructors

### ObservableLong

```
ObservableLong (long value)
```

Creates an ObservableLong with the given initial value.

<br />

|                            Parameters                            ||
|---------|---------------------------------------------------------|
| `value` | `long`: the initial value for the ObservableLong <br /> |

### ObservableLong

```
ObservableLong ()
```

Creates an ObservableLong with the initial value of`0L`.

<br />

### ObservableLong

```
ObservableLong (Observable... dependencies)
```

Creates an ObservableLong that depends on`dependencies`. Typically,[ObservableField](https://developer.android.com/reference/android/databinding/ObservableField)s are passed as dependencies. When any dependency notifies changes, this ObservableLong also notifies a change.

<br />

|                                        Parameters                                         ||
|----------------|---------------------------------------------------------------------------|
| `dependencies` | `Observable`: The Observables that this ObservableLong depends on. <br /> |

## Public methods

### describeContents

```
int describeContents ()
```

<br />

<br />

|    Returns    ||
|-------|--------|
| `int` | <br /> |

### get

```
long get ()
```

<br />

<br />

|             Returns              ||
|--------|--------------------------|
| `long` | the stored value. <br /> |

### set

```
void set (long value)
```

Set the stored value.

<br />

|              Parameters               ||
|---------|------------------------------|
| `value` | `long`: The new value <br /> |

### writeToParcel

```
void writeToParcel (Parcel dest, 
                int flags)
```

<br />

<br />

|        Parameters        ||
|---------|-----------------|
| `dest`  | `Parcel` <br /> |
| `flags` | `int` <br />    |

-

  ## Annotations

  - [Bindable](https://developer.android.com/reference/android/databinding/Bindable)
  - [BindingAdapter](https://developer.android.com/reference/android/databinding/BindingAdapter)
  - [BindingConversion](https://developer.android.com/reference/android/databinding/BindingConversion)
  - [BindingMethod](https://developer.android.com/reference/android/databinding/BindingMethod)
  - [BindingMethods](https://developer.android.com/reference/android/databinding/BindingMethods)
  - [InverseBindingAdapter](https://developer.android.com/reference/android/databinding/InverseBindingAdapter)
  - [InverseBindingMethod](https://developer.android.com/reference/android/databinding/InverseBindingMethod)
  - [InverseBindingMethods](https://developer.android.com/reference/android/databinding/InverseBindingMethods)
  - [InverseMethod](https://developer.android.com/reference/android/databinding/InverseMethod)
-

  ## Interfaces

  - [DataBindingComponent](https://developer.android.com/reference/android/databinding/DataBindingComponent)
  - [InverseBindingListener](https://developer.android.com/reference/android/databinding/InverseBindingListener)
  - [Observable](https://developer.android.com/reference/android/databinding/Observable)
  - [ObservableList](https://developer.android.com/reference/android/databinding/ObservableList)
  - [ObservableMap](https://developer.android.com/reference/android/databinding/ObservableMap)
-

  ## Classes

  - [BaseObservable](https://developer.android.com/reference/android/databinding/BaseObservable)
  - [CallbackRegistry](https://developer.android.com/reference/android/databinding/CallbackRegistry)
  - [CallbackRegistry.NotifierCallback](https://developer.android.com/reference/android/databinding/CallbackRegistry.NotifierCallback)
  - [DataBindingUtil](https://developer.android.com/reference/android/databinding/DataBindingUtil)
  - [ListChangeRegistry](https://developer.android.com/reference/android/databinding/ListChangeRegistry)
  - [MapChangeRegistry](https://developer.android.com/reference/android/databinding/MapChangeRegistry)
  - [MergedDataBinderMapper](https://developer.android.com/reference/android/databinding/MergedDataBinderMapper)
  - [Observable.OnPropertyChangedCallback](https://developer.android.com/reference/android/databinding/Observable.OnPropertyChangedCallback)
  - [ObservableArrayList](https://developer.android.com/reference/android/databinding/ObservableArrayList)
  - [ObservableArrayMap](https://developer.android.com/reference/android/databinding/ObservableArrayMap)
  - [ObservableBoolean](https://developer.android.com/reference/android/databinding/ObservableBoolean)
  - [ObservableByte](https://developer.android.com/reference/android/databinding/ObservableByte)
  - [ObservableChar](https://developer.android.com/reference/android/databinding/ObservableChar)
  - [ObservableDouble](https://developer.android.com/reference/android/databinding/ObservableDouble)
  - [ObservableField](https://developer.android.com/reference/android/databinding/ObservableField)
  - [ObservableFloat](https://developer.android.com/reference/android/databinding/ObservableFloat)
  - [ObservableInt](https://developer.android.com/reference/android/databinding/ObservableInt)
  - [ObservableList.OnListChangedCallback](https://developer.android.com/reference/android/databinding/ObservableList.OnListChangedCallback)
  - [ObservableLong](https://developer.android.com/reference/android/databinding/ObservableLong)
  - [ObservableMap.OnMapChangedCallback](https://developer.android.com/reference/android/databinding/ObservableMap.OnMapChangedCallback)
  - [ObservableParcelable](https://developer.android.com/reference/android/databinding/ObservableParcelable)
  - [ObservableShort](https://developer.android.com/reference/android/databinding/ObservableShort)
  - [OnRebindCallback](https://developer.android.com/reference/android/databinding/OnRebindCallback)
  - [PropertyChangeRegistry](https://developer.android.com/reference/android/databinding/PropertyChangeRegistry)
  - [ViewDataBinding](https://developer.android.com/reference/android/databinding/ViewDataBinding)
  - [ViewStubProxy](https://developer.android.com/reference/android/databinding/ViewStubProxy)