 The easiest way to use a SaveCallback is through an anonymous inner class. Override the
 <code>done</code> function to specify what the callback should do after the save is complete. The
 <code>done</code> function will be run in the UI thread, while the save happens in a background
 thread. This ensures that the UI does not freeze while the save happens.
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 For example, this sample code saves the object <code>myObject</code> and calls a different
 function depending on whether the save succeeded or not