# CastPlayer.TransferCallback

Artifact: [androidx.media3:media3-cast](https://developer.android.com/jetpack/androidx/releases/media3) [View Source](https://cs.android.com/search?q=file:androidx/media3/cast/CastPlayer.java+class:androidx.media3.cast.CastPlayer.TransferCallback)

*** ** * ** ***


```
public interface CastPlayer.TransferCallback
```

<br />

Known direct subclasses [DefaultCastPlayerTransferCallback](https://developer.android.com/reference/androidx/media3/cast/DefaultCastPlayerTransferCallback)

|---|---|
| `https://developer.android.com/reference/androidx/media3/cast/DefaultCastPlayerTransferCallback` | The default `https://developer.android.com/reference/androidx/media3/cast/CastPlayer.TransferCallback` implementation. |

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Callback for moving state across players when transferring playback upon Cast session availability changes.

## Summary

| ### Constants |
|---|---|
| `default static final https://developer.android.com/reference/androidx/media3/cast/CastPlayer.TransferCallback` | `https://developer.android.com/reference/androidx/media3/cast/CastPlayer.TransferCallback#DEFAULT()` |

| ### Public methods |
|---|---|
| `abstract void` | `https://developer.android.com/reference/androidx/media3/cast/CastPlayer.TransferCallback#transferState(androidx.media3.common.Player,androidx.media3.common.Player)(https://developer.android.com/reference/androidx/media3/common/Player sourcePlayer, https://developer.android.com/reference/androidx/media3/common/Player targetPlayer)` Called immediately before changing the active `https://developer.android.com/reference/androidx/media3/common/Player`, with the intended use of transferring playback state. |

## Constants

### DEFAULT

```
default static final CastPlayer.TransferCallback DEFAULT
```

## Public methods

### transferState

```
abstract void transferState(Player sourcePlayer, Player targetPlayer)
```

Called immediately before changing the active `https://developer.android.com/reference/androidx/media3/common/Player`, with the intended use of transferring playback state.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/media3/common/Player sourcePlayer` | The `https://developer.android.com/reference/androidx/media3/common/Player` from which playback is transferring, from which to fetch the state. |
| `https://developer.android.com/reference/androidx/media3/common/Player targetPlayer` | The `https://developer.android.com/reference/androidx/media3/common/Player` to which playback is transferring, to populate with state. |

| See also |
|---|---|
| `https://developer.android.com/reference/androidx/media3/common/PlayerTransferState` |   |