| CancellationSignal.OnCancelListener | Listens for cancellation. |
| Log.LogCallback | User defined logger interface. |
| CancellationSignal | Provides the ability to cancel an operation in progress. |
| Context | Wrapper class to implement database opening methods as android.content.Context does. |
| Log | API for WCDB log redirection. |
| LogPrinter | Implementation of a android.util.Printer that sends its output to the system log. |
| OperationCanceledException | An exception type that is thrown when an operation in progress is canceled. |