# RoomDatabase.PrepackagedDatabaseCallback

Artifact: [androidx.room:room-runtime](https://developer.android.com/jetpack/androidx/releases/room) [View Source](https://cs.android.com/search?q=file:androidx/room/RoomDatabase.android.kt+class:androidx.room.RoomDatabase.PrepackagedDatabaseCallback) Added in [2.3.0](https://developer.android.com/jetpack/androidx/releases/room#2.3.0)

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```
public abstract class RoomDatabase.PrepackagedDatabaseCallback
```

<br />

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Callback for `https://developer.android.com/reference/androidx/room/RoomDatabase.Builder#createFromAsset(kotlin.String)`, `https://developer.android.com/reference/androidx/room/RoomDatabase.Builder#createFromFile(java.io.File)` and `https://developer.android.com/reference/androidx/room/RoomDatabase.Builder#createFromInputStream(java.util.concurrent.Callable)`

This callback will be invoked after the pre-package DB is copied but before Room had a chance to open it and therefore before the `https://developer.android.com/reference/androidx/room/RoomDatabase.Callback` methods are invoked. This callback can be useful for updating the pre-package DB schema to satisfy Room's schema validation.

## Summary

| ### Public constructors |
|---|
| `https://developer.android.com/reference/androidx/room/RoomDatabase.PrepackagedDatabaseCallback#PrepackagedDatabaseCallback()()` |

| ### Public methods |
|---|---|
| `void` | `https://developer.android.com/reference/androidx/room/RoomDatabase.PrepackagedDatabaseCallback#onOpenPrepackagedDatabase(androidx.sqlite.db.SupportSQLiteDatabase)(@https://developer.android.com/reference/androidx/annotation/NonNull https://developer.android.com/reference/androidx/sqlite/db/SupportSQLiteDatabase db)` Called when the pre-packaged database has been copied. |

## Public constructors

### PrepackagedDatabaseCallback

Added in [2.3.0](https://developer.android.com/jetpack/androidx/releases/room#2.3.0)

```
public PrepackagedDatabaseCallback()
```

## Public methods

### onOpenPrepackagedDatabase

Added in [2.3.0](https://developer.android.com/jetpack/androidx/releases/room#2.3.0)

```
public void onOpenPrepackagedDatabase(@NonNull SupportSQLiteDatabase db)
```

Called when the pre-packaged database has been copied.

| Parameters |
|---|---|
| `@https://developer.android.com/reference/androidx/annotation/NonNull https://developer.android.com/reference/androidx/sqlite/db/SupportSQLiteDatabase db` | The database. |