# ItemBridgeAdapter

Artifact: [androidx.leanback:leanback](https://developer.android.com/jetpack/androidx/releases/leanback) [View Source](https://cs.android.com/search?q=file:androidx/leanback/widget/ItemBridgeAdapter.java+class:androidx.leanback.widget.ItemBridgeAdapter) Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

*** ** * ** ***


```
public class ItemBridgeAdapter extends RecyclerView.Adapter implements FacetProviderAdapter
```

<br />

|---|---|---|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object.html) |||
| ↳ | [androidx.recyclerview.widget.RecyclerView.Adapter](https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter) ||
|   | ↳ | [androidx.leanback.widget.ItemBridgeAdapter](https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter) |

*** ** * ** ***

Bridge from `https://developer.android.com/reference/androidx/leanback/widget/Presenter` to `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter`. Public to allow use by third party Presenters.

## Summary

| ### Nested types |
|---|
| `public class https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter.AdapterListener` Interface for listening to ViewHolder operations. |
| `public class https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter.ViewHolder extends https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder implements https://developer.android.com/reference/androidx/leanback/widget/FacetProvider` ViewHolder for the ItemBridgeAdapter. |
| `public abstract class https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter.Wrapper` Interface for wrapping a view created by a Presenter into another view. |

| ### Public constructors |
|---|
| `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#ItemBridgeAdapter()()` |
| `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#ItemBridgeAdapter(androidx.leanback.widget.ObjectAdapter)(https://developer.android.com/reference/androidx/leanback/widget/ObjectAdapter adapter)` |
| `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#ItemBridgeAdapter(androidx.leanback.widget.ObjectAdapter,androidx.leanback.widget.PresenterSelector)( https://developer.android.com/reference/androidx/leanback/widget/ObjectAdapter adapter, https://developer.android.com/reference/androidx/leanback/widget/PresenterSelector presenterSelector )` |

| ### Public methods |
|---|---|
| `void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#clear()()` Clears the adapter. |
| `https://developer.android.com/reference/androidx/leanback/widget/FacetProvider` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#getFacetProvider(int)(int type)` Queries `https://developer.android.com/reference/androidx/leanback/widget/FacetProvider` for a given type within Adapter. |
| `int` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#getItemCount()()` Returns the total number of items in the data set held by the adapter. |
| `long` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#getItemId(int)(int position)` Return the stable ID for the item at `position`. |
| `int` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#getItemViewType(int)(int position)` Return the view type of the item at `position` for the purposes of view recycling. |
| `https://developer.android.com/reference/java/util/ArrayList.html<https://developer.android.com/reference/androidx/leanback/widget/Presenter>` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#getPresenterMapper()()` Returns the presenter mapper array. |
| `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter.Wrapper` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#getWrapper()()` Returns the `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter.Wrapper`. |
| `final void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#onBindViewHolder(androidx.recyclerview.widget.RecyclerView.ViewHolder,int)(https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder holder, int position)` Called by RecyclerView to display the data at the specified position. |
| `final void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#onBindViewHolder(androidx.recyclerview.widget.RecyclerView.ViewHolder,int,java.util.List)( https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder holder, int position, https://developer.android.com/reference/java/util/List.html payloads )` Called by RecyclerView to display the data at the specified position. |
| `final https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#onCreateViewHolder(android.view.ViewGroup,int)(https://developer.android.com/reference/android/view/ViewGroup.html parent, int viewType)` `https://developer.android.com/reference/android/view/View.OnFocusChangeListener.html` that assigned in `https://developer.android.com/reference/androidx/leanback/widget/Presenter#onCreateViewHolder(android.view.ViewGroup)` may be chained, user should never change `https://developer.android.com/reference/android/view/View.OnFocusChangeListener.html` after that. |
| `final boolean` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#onFailedToRecycleView(androidx.recyclerview.widget.RecyclerView.ViewHolder)(https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder holder)` Called by the RecyclerView if a ViewHolder created by this Adapter cannot be recycled due to its transient state. |
| `final void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#onViewAttachedToWindow(androidx.recyclerview.widget.RecyclerView.ViewHolder)(https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder holder)` Called when a view created by this adapter has been attached to a window. |
| `final void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#onViewDetachedFromWindow(androidx.recyclerview.widget.RecyclerView.ViewHolder)(https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder holder)` Called when a view created by this adapter has been detached from its window. |
| `final void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#onViewRecycled(androidx.recyclerview.widget.RecyclerView.ViewHolder)(https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder holder)` Called when a view created by this adapter has been recycled. |
| `void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#setAdapter(androidx.leanback.widget.ObjectAdapter)(https://developer.android.com/reference/androidx/leanback/widget/ObjectAdapter adapter)` Sets the `https://developer.android.com/reference/androidx/leanback/widget/ObjectAdapter`. |
| `void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#setAdapterListener(androidx.leanback.widget.ItemBridgeAdapter.AdapterListener)(https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter.AdapterListener listener)` Sets the AdapterListener. |
| `void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#setPresenter(androidx.leanback.widget.PresenterSelector)(https://developer.android.com/reference/androidx/leanback/widget/PresenterSelector presenterSelector)` Changes Presenter that creates and binds the view. |
| `void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#setPresenterMapper(java.util.ArrayList<androidx.leanback.widget.Presenter>)(https://developer.android.com/reference/java/util/ArrayList.html<https://developer.android.com/reference/androidx/leanback/widget/Presenter> presenters)` Sets the presenter mapper array. |
| `void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#setWrapper(androidx.leanback.widget.ItemBridgeAdapter.Wrapper)(https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter.Wrapper wrapper)` Sets the `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter.Wrapper`. |

| ### Protected methods |
|---|---|
| `void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#onAddPresenter(androidx.leanback.widget.Presenter,int)(https://developer.android.com/reference/androidx/leanback/widget/Presenter presenter, int type)` Called when presenter is added to Adapter. |
| `void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#onAttachedToWindow(androidx.leanback.widget.ItemBridgeAdapter.ViewHolder)(https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter.ViewHolder viewHolder)` Called when ViewHolder has been attached to window. |
| `void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#onBind(androidx.leanback.widget.ItemBridgeAdapter.ViewHolder)(https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter.ViewHolder viewHolder)` Called when ViewHolder has been bound to data. |
| `void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#onCreate(androidx.leanback.widget.ItemBridgeAdapter.ViewHolder)(https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter.ViewHolder viewHolder)` Called when ViewHolder is created. |
| `void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#onDetachedFromWindow(androidx.leanback.widget.ItemBridgeAdapter.ViewHolder)(https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter.ViewHolder viewHolder)` Called when ViewHolder has been detached from window. |
| `void` | `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter#onUnbind(androidx.leanback.widget.ItemBridgeAdapter.ViewHolder)(https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter.ViewHolder viewHolder)` Called when ViewHolder has been unbound from data. |

| ### Inherited methods |
|---|
| From [androidx.recyclerview.widget.RecyclerView.Adapter](https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter) |---|---| | `final void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#bindViewHolder(VH,int)(@https://developer.android.com/reference/androidx/annotation/NonNull VH holder, int position)` This method internally calls `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#onBindViewHolder(VH,int)` to update the `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder` contents with the item at the given position and also sets up some private fields to be used by RecyclerView. | | `final @https://developer.android.com/reference/androidx/annotation/NonNull VH` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#createViewHolder(android.view.ViewGroup,int)(@https://developer.android.com/reference/androidx/annotation/NonNull https://developer.android.com/reference/android/view/ViewGroup.html parent, int viewType)` This method calls `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#onCreateViewHolder(android.view.ViewGroup,int)` to create a new `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder` and initializes some private fields to be used by RecyclerView. | | `int` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#findRelativeAdapterPositionIn(androidx.recyclerview.widget.RecyclerView.Adapter<? extends androidx.recyclerview.widget.RecyclerView.ViewHolder>,androidx.recyclerview.widget.RecyclerView.ViewHolder,int)( @https://developer.android.com/reference/androidx/annotation/NonNull https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter<https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder> adapter, @https://developer.android.com/reference/androidx/annotation/NonNull https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder viewHolder, int localPosition )` Returns the position of the given `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder` in the given `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter`. | | `final @https://developer.android.com/reference/androidx/annotation/NonNull https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter.StateRestorationPolicy` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#getStateRestorationPolicy()()` Returns when this Adapter wants to restore the state. | | `final boolean` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#hasObservers()()` Returns true if one or more observers are attached to this adapter. | | `final boolean` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#hasStableIds()()` Returns true if this adapter publishes a unique `long` value that can act as a key for the item at a given position in the data set. | | `final void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#notifyDataSetChanged()()` Notify any registered observers that the data set has changed. | | `final void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#notifyItemChanged(int)(int position)` Notify any registered observers that the item at `position` has changed. | | `final void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#notifyItemChanged(int,java.lang.Object)(int position, @https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/java/lang/Object.html payload)` Notify any registered observers that the item at `position` has changed with an optional payload object. | | `final void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#notifyItemInserted(int)(int position)` Notify any registered observers that the item reflected at `position` has been newly inserted. | | `final void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#notifyItemMoved(int,int)(int fromPosition, int toPosition)` Notify any registered observers that the item reflected at `fromPosition` has been moved to `toPosition`. | | `final void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#notifyItemRangeChanged(int,int)(int positionStart, int itemCount)` Notify any registered observers that the `itemCount` items starting at position `positionStart` have changed. | | `final void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#notifyItemRangeChanged(int,int,java.lang.Object)( int positionStart, int itemCount, @https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/java/lang/Object.html payload )` Notify any registered observers that the `itemCount` items starting at position `positionStart` have changed. | | `final void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#notifyItemRangeInserted(int,int)(int positionStart, int itemCount)` Notify any registered observers that the currently reflected `itemCount` items starting at `positionStart` have been newly inserted. | | `final void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#notifyItemRangeRemoved(int,int)(int positionStart, int itemCount)` Notify any registered observers that the `itemCount` items previously located at `positionStart` have been removed from the data set. | | `final void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#notifyItemRemoved(int)(int position)` Notify any registered observers that the item previously located at `position` has been removed from the data set. | | `void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#onAttachedToRecyclerView(androidx.recyclerview.widget.RecyclerView)(@https://developer.android.com/reference/androidx/annotation/NonNull https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView recyclerView)` Called by RecyclerView when it starts observing this Adapter. | | `void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#onDetachedFromRecyclerView(androidx.recyclerview.widget.RecyclerView)(@https://developer.android.com/reference/androidx/annotation/NonNull https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView recyclerView)` Called by RecyclerView when it stops observing this Adapter. | | `void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#registerAdapterDataObserver(androidx.recyclerview.widget.RecyclerView.AdapterDataObserver)( @https://developer.android.com/reference/androidx/annotation/NonNull https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.AdapterDataObserver observer )` Register a new observer to listen for data changes. | | `void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#setHasStableIds(boolean)(boolean hasStableIds)` Indicates whether each item in the data set can be represented with a unique identifier of type `https://developer.android.com/reference/java/lang/Long.html`. | | `void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#setStateRestorationPolicy(androidx.recyclerview.widget.RecyclerView.Adapter.StateRestorationPolicy)( @https://developer.android.com/reference/androidx/annotation/NonNull https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter.StateRestorationPolicy strategy )` Sets the state restoration strategy for the Adapter. | | `void` | `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#unregisterAdapterDataObserver(androidx.recyclerview.widget.RecyclerView.AdapterDataObserver)( @https://developer.android.com/reference/androidx/annotation/NonNull https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.AdapterDataObserver observer )` Unregister an observer currently listening for data changes. | |

## Public constructors

### ItemBridgeAdapter

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public ItemBridgeAdapter()
```

### ItemBridgeAdapter

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public ItemBridgeAdapter(ObjectAdapter adapter)
```

### ItemBridgeAdapter

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public ItemBridgeAdapter(
    ObjectAdapter adapter,
    PresenterSelector presenterSelector
)
```

## Public methods

### clear

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public void clear()
```

Clears the adapter.

### getFacetProvider

```
public FacetProvider getFacetProvider(int type)
```

Queries `https://developer.android.com/reference/androidx/leanback/widget/FacetProvider` for a given type within Adapter.

| Parameters |
|---|---|
| `int type` | type of the item. |

| Returns |
|---|---|
| `https://developer.android.com/reference/androidx/leanback/widget/FacetProvider` | Facet provider for the type. |

### getItemCount

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public int getItemCount()
```

Returns the total number of items in the data set held by the adapter.

| Returns |
|---|---|
| `int` | The total number of items in this adapter. |

### getItemId

```
public long getItemId(int position)
```

Return the stable ID for the item at `position`. If `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#hasStableIds()` would return false this method should return `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView#NO_ID()`. The default implementation of this method returns `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView#NO_ID()`.

| Parameters |
|---|---|
| `int position` | Adapter position to query |

| Returns |
|---|---|
| `long` | the stable ID of the item at position |

### getItemViewType

```
public int getItemViewType(int position)
```

Return the view type of the item at `position` for the purposes of view recycling.

The default implementation of this method returns 0, making the assumption of a single view type for the adapter. Unlike ListView adapters, types need not be contiguous. Consider using id resources to uniquely identify item view types.

| Parameters |
|---|---|
| `int position` | position to query |

| Returns |
|---|---|
| `int` | integer value identifying the type of the view needed to represent the item at `position`. Type codes need not be contiguous. |

### getPresenterMapper

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public ArrayList<Presenter> getPresenterMapper()
```

Returns the presenter mapper array.

### getWrapper

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public ItemBridgeAdapter.Wrapper getWrapper()
```

Returns the `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter.Wrapper`.

### onBindViewHolder

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public final void onBindViewHolder(RecyclerView.ViewHolder holder, int position)
```

Called by RecyclerView to display the data at the specified position. This method should update the contents of the `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder#itemView()` to reflect the item at the given position.

Note that unlike `https://developer.android.com/reference/android/widget/ListView.html`, RecyclerView will not call this method again if the position of the item changes in the data set unless the item itself is invalidated or the new position cannot be determined. For this reason, you should only use the `position` parameter while acquiring the related data item inside this method and should not keep a copy of it. If you need the position of an item later on (e.g. in a click listener), use `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder#getBindingAdapterPosition()` which will have the updated adapter position. Override `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#onBindViewHolder(VH,int,java.util.List<java.lang.Object>)` instead if Adapter can handle efficient partial bind.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder holder` | The ViewHolder which should be updated to represent the contents of the item at the given position in the data set. |
| `int position` | The position of the item within the adapter's data set. |

### onBindViewHolder

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public final void onBindViewHolder(
    RecyclerView.ViewHolder holder,
    int position,
    List payloads
)
```

Called by RecyclerView to display the data at the specified position. This method should update the contents of the `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder#itemView()` to reflect the item at the given position.

Note that unlike `https://developer.android.com/reference/android/widget/ListView.html`, RecyclerView will not call this method again if the position of the item changes in the data set unless the item itself is invalidated or the new position cannot be determined. For this reason, you should only use the `position` parameter while acquiring the related data item inside this method and should not keep a copy of it. If you need the position of an item later on (e.g. in a click listener), use `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder#getBindingAdapterPosition()` which will have the updated adapter position.

Partial bind vs full bind:

The payloads parameter is a merge list from `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#notifyItemChanged(int,java.lang.Object)` or `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#notifyItemRangeChanged(int,int,java.lang.Object)`. If the payloads list is not empty, the ViewHolder is currently bound to old data and Adapter may run an efficient partial update using the payload info. If the payload is empty, Adapter must run a full bind. Adapter should not assume that the payload passed in notify methods will be received by onBindViewHolder(). For example when the view is not attached to the screen, the payload in notifyItemChange() will be simply dropped.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder holder` | The ViewHolder which should be updated to represent the contents of the item at the given position in the data set. |
| `int position` | The position of the item within the adapter's data set. |
| `https://developer.android.com/reference/java/util/List.html payloads` | A non-null list of merged payloads. Can be empty list if requires full update. |

### onCreateViewHolder

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public final RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
```

`https://developer.android.com/reference/android/view/View.OnFocusChangeListener.html` that assigned in `https://developer.android.com/reference/androidx/leanback/widget/Presenter#onCreateViewHolder(android.view.ViewGroup)` may be chained, user should never change `https://developer.android.com/reference/android/view/View.OnFocusChangeListener.html` after that.

### onFailedToRecycleView

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public final boolean onFailedToRecycleView(RecyclerView.ViewHolder holder)
```

Called by the RecyclerView if a ViewHolder created by this Adapter cannot be recycled due to its transient state. Upon receiving this callback, Adapter can clear the animation(s) that effect the View's transient state and return `true` so that the View can be recycled. Keep in mind that the View in question is already removed from the RecyclerView.

In some cases, it is acceptable to recycle a View although it has transient state. Most of the time, this is a case where the transient state will be cleared in `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#onBindViewHolder(VH,int)` call when View is rebound to a new position. For this reason, RecyclerView leaves the decision to the Adapter and uses the return value of this method to decide whether the View should be recycled or not.

Note that when all animations are created by `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ItemAnimator`, you should never receive this callback because RecyclerView keeps those Views as children until their animations are complete. This callback is useful when children of the item views create animations which may not be easy to implement using an `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ItemAnimator`.

You should *never* fix this issue by calling `holder.itemView.setHasTransientState(false);` unless you've previously called `holder.itemView.setHasTransientState(true);`. Each `View.setHasTransientState(true)` call must be matched by a `View.setHasTransientState(false)` call, otherwise, the state of the View may become inconsistent. You should always prefer to end or cancel animations that are triggering the transient state instead of handling it manually.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder holder` | The ViewHolder containing the View that could not be recycled due to its transient state. |

| Returns |
|---|---|
| `boolean` | True if the View should be recycled, false otherwise. Note that if this method returns `true`, RecyclerView *will ignore* the transient state of the View and recycle it regardless. If this method returns `false`, RecyclerView will check the View's transient state again before giving a final decision. Default implementation returns false. |

### onViewAttachedToWindow

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public final void onViewAttachedToWindow(RecyclerView.ViewHolder holder)
```

Called when a view created by this adapter has been attached to a window.

This can be used as a reasonable signal that the view is about to be seen by the user. If the adapter previously freed any resources in `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter#onViewDetachedFromWindow(VH)` those resources should be restored here.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder holder` | Holder of the view being attached |

### onViewDetachedFromWindow

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public final void onViewDetachedFromWindow(RecyclerView.ViewHolder holder)
```

Called when a view created by this adapter has been detached from its window.

Becoming detached from the window is not necessarily a permanent condition; the consumer of an Adapter's views may choose to cache views offscreen while they are not visible, attaching and detaching them as appropriate.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder holder` | Holder of the view being detached |

### onViewRecycled

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public final void onViewRecycled(RecyclerView.ViewHolder holder)
```

Called when a view created by this adapter has been recycled.

A view is recycled when a `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.LayoutManager` decides that it no longer needs to be attached to its parent `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView`. This can be because it has fallen out of visibility or a set of cached views represented by views still attached to the parent RecyclerView. If an item view has large or expensive data bound to it such as large bitmaps, this may be a good place to release those resources.

RecyclerView calls this method right before clearing ViewHolder's internal data and sending it to RecycledViewPool. This way, if ViewHolder was holding valid information before being recycled, you can call `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder#getBindingAdapterPosition()` to get its adapter position.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder holder` | The ViewHolder for the view being recycled |

### setAdapter

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public void setAdapter(ObjectAdapter adapter)
```

Sets the `https://developer.android.com/reference/androidx/leanback/widget/ObjectAdapter`.

### setAdapterListener

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public void setAdapterListener(ItemBridgeAdapter.AdapterListener listener)
```

Sets the AdapterListener.

### setPresenter

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public void setPresenter(PresenterSelector presenterSelector)
```

Changes Presenter that creates and binds the view.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/leanback/widget/PresenterSelector presenterSelector` | Presenter that creates and binds the view. |

### setPresenterMapper

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public void setPresenterMapper(ArrayList<Presenter> presenters)
```

Sets the presenter mapper array.

### setWrapper

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
public void setWrapper(ItemBridgeAdapter.Wrapper wrapper)
```

Sets the `https://developer.android.com/reference/androidx/leanback/widget/ItemBridgeAdapter.Wrapper`.

## Protected methods

### onAddPresenter

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
protected void onAddPresenter(Presenter presenter, int type)
```

Called when presenter is added to Adapter.

### onAttachedToWindow

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
protected void onAttachedToWindow(ItemBridgeAdapter.ViewHolder viewHolder)
```

Called when ViewHolder has been attached to window.

### onBind

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
protected void onBind(ItemBridgeAdapter.ViewHolder viewHolder)
```

Called when ViewHolder has been bound to data.

### onCreate

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
protected void onCreate(ItemBridgeAdapter.ViewHolder viewHolder)
```

Called when ViewHolder is created.

### onDetachedFromWindow

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
protected void onDetachedFromWindow(ItemBridgeAdapter.ViewHolder viewHolder)
```

Called when ViewHolder has been detached from window.

### onUnbind

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)

```
protected void onUnbind(ItemBridgeAdapter.ViewHolder viewHolder)
```

Called when ViewHolder has been unbound from data.