# AsyncDifferConfig.Builder

added in[version 27.1.0](https://developer.android.com/topic/libraries/support-library/revisions)  
belongs to Maven artifact com.android.support:recyclerview-v7:28.0.0-alpha1  
Summary:[Ctors](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncDifferConfig.Builder#pubctors)\|[Methods](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncDifferConfig.Builder#pubmethods)\|[Inherited Methods](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncDifferConfig.Builder#inhmethods)\|[\[Expand All\]](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncDifferConfig.Builder#)  

# AsyncDifferConfig.Builder

| This package is part of the Android[support library](https://developer.android.com/topic/libraries/support-library)which is no longer maintained. The support library has been superseded by[AndroidX](https://developer.android.com/jetpack/androidx)which is part of[Jetpack](https://developer.android.com/jetpack). We recommend using the AndroidX libraries in all new projects. You should also consider[migrating](https://developer.android.com/jetpack/androidx/migrate)existing projects to AndroidX. To find the AndroidX class that maps to this deprecated class, see the AndroidX support library[class mappings](https://developer.android.com/jetpack/androidx/migrate/class-mappings).

`
public
static
final

class
AsyncDifferConfig.Builder
`  
`

extends Object


``


`

|---|---------------------------------------------------------------------------|
| java.lang.Object                                                             ||
| ↳ | android.support.v7.recyclerview.extensions.AsyncDifferConfig.Builder\<T\> |

<br />

*** ** * ** ***

Builder class for[AsyncDifferConfig](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncDifferConfig).

## Summary

|                                                                                                                                                                 ### Public constructors                                                                                                                                                                 ||
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---|
| ` `[AsyncDifferConfig.Builder](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncDifferConfig.Builder#AsyncDifferConfig.Builder(android.support.v7.util.DiffUtil.ItemCallback<T>))`(`[ItemCallback](https://developer.android.com/reference/android/support/v7/util/DiffUtil.ItemCallback)`<T> diffCallback) ` |

|                                                                                                                                                                                                                            ### Public methods                                                                                                                                                                                                                             ||
|-----------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` `[AsyncDifferConfig](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncDifferConfig)`<T>` | ` `[build](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncDifferConfig.Builder#build())`() ` Creates a[AsyncListDiffer](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncListDiffer)with the given parameters.                                         |
| ` `[Builder](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncDifferConfig.Builder)`<T>`   | ` `[setBackgroundThreadExecutor](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncDifferConfig.Builder#setBackgroundThreadExecutor(java.util.concurrent.Executor))`(Executor executor) ` If provided, defines the background executor used to calculate the diff between an old and a new list. |

| ### Inherited methods |
|-----------------------|---|
| [![](https://developer.android.com/static/assets/images/styles/disclosure_down.png)](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncDifferConfig.Builder#)From class` java.lang.Object ` |-------------------|-------------------------------| | ` Object`         | ` clone() `                   | | ` boolean`        | ` equals(Object arg0) `       | | ` void`           | ` finalize() `                | | ` final Class<?>` | ` getClass() `                | | ` int`            | ` hashCode() `                | | ` final void`     | ` notify() `                  | | ` final void`     | ` notifyAll() `               | | ` String`         | ` toString() `                | | ` final void`     | ` wait(long arg0, int arg1) ` | | ` final void`     | ` wait(long arg0) `           | | ` final void`     | ` wait() `                    | ||

## Public constructors

### AsyncDifferConfig.Builder

added in[version 27.1.0](https://developer.android.com/topic/libraries/support-library/revisions)  

```
AsyncDifferConfig.Builder (ItemCallback<T> diffCallback)
```

<br />

<br />

|              Parameters               ||
|----------------|-----------------------|
| `diffCallback` | `ItemCallback` <br /> |

## Public methods

### build

added in[version 27.1.0](https://developer.android.com/topic/libraries/support-library/revisions)  

```
AsyncDifferConfig<T> build ()
```

Creates a[AsyncListDiffer](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncListDiffer)with the given parameters.

<br />

|                                                                             Returns                                                                             ||
|--------------------------------------------------------------------------------------------------------------------------------|---------------------------------|
| [AsyncDifferConfig](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncDifferConfig)`<T>` | A new AsyncDifferConfig. <br /> |

### setBackgroundThreadExecutor

added in[version 27.1.0](https://developer.android.com/topic/libraries/support-library/revisions)  

```
Builder<T> setBackgroundThreadExecutor (Executor executor)
```

If provided, defines the background executor used to calculate the diff between an old and a new list.

If not provided, defaults to two thread pool executor, shared by all ListAdapterConfigs.

<br />

|                                 Parameters                                  ||
|------------|-----------------------------------------------------------------|
| `executor` | `Executor`: The background executor to run list diffing. <br /> |

|                                                                  Returns                                                                  ||
|------------------------------------------------------------------------------------------------------------------------------|-------------|
| [Builder](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncDifferConfig.Builder)`<T>` | this <br /> |

-

  ## Classes

  - [AsyncDifferConfig](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncDifferConfig)
  - [AsyncDifferConfig.Builder](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncDifferConfig.Builder)
  - [AsyncListDiffer](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/AsyncListDiffer)
  - [ListAdapter](https://developer.android.com/reference/android/support/v7/recyclerview/extensions/ListAdapter)