## Uses of Interface
com.google.gwt.core.client.Callback

- Packages that use Callback
  Package | Description
  --- | ---
  com.google.gwt.core.client | Fundamental classes used in client-side GWT code.
  com.google.gwt.geolocation.client | Support for the HTML5 Geolocation API.

- - ### Uses of Callback in com.google.gwt.core.client

    Methods in com.google.gwt.core.client with parameters of type Callback
    Modifier and Type | Method and Description
    --- | ---
    `void` | AsyncProvider.`get(Callback<? super T,? super F> callback)`
    `ScriptInjector.FromUrl` | ScriptInjector.FromUrl.`setCallback(Callback<java.lang.Void,java.lang.Exception> callback)` Specify a callback to be invoked when the script is loaded or loading encounters an error.

  - ### Uses of Callback in com.google.gwt.geolocation.client

    Methods in com.google.gwt.geolocation.client with parameters of type Callback
    Modifier and Type | Method and Description
    --- | ---
    `void` | Geolocation.`getCurrentPosition(Callback<Position,PositionError> callback)` Calls the callback with the user's current position.
    `void` | Geolocation.`getCurrentPosition(Callback<Position,PositionError> callback, Geolocation.PositionOptions options)` Calls the callback with the user's current position, with additional options.
    `int` | Geolocation.`watchPosition(Callback<Position,PositionError> callback)` Repeatedly calls the given callback with the user's position, as it changes.
    `int` | Geolocation.`watchPosition(Callback<Position,PositionError> callback, Geolocation.PositionOptions options)` Repeatedly calls the given callback with the user's position, as it changes, with additional options.