Android design pattern for background operation with UI and non-UI modes

Question

I have a background operation that I\'d like to be able to run in two modes:

• UI mode, which is launched by the user and provides the user preci

Answer 1

At the moment, I am leaning towards the following solution. Define MyAsyncTask without UI and MyUIAsyncTask extends MyAsyncTask with UI; this achieves UI mode. Define MyService which has an instance of MyAsyncTask (see [Is it possible to use AsyncTask in a Service class?); which achieves non-UI mode. I'm not convinced that this is the best solution, moreover, it violates the following threading rules:

• The AsyncTask class must be loaded on the UI thread.
• The task instance must be created on the UI thread.
• execute(Params...) must be invoked on the UI thread.