This function will normally be called for you automatically by Android.App.LoaderManager when the associated fragment/activity is being stopped. When using a Loader with Android.App.LoaderManager, you must not call this method yourself, or you will conflict with its management of the Loader.
Stops delivery of updates until the next time Loader.StartLoading is called. Implementations should not invalidate their data at this point -- clients are still free to use the last data the loader reported. They will, however, typically stop reporting new data if the data changes; they can still monitor for changes, but must not report them to the client until and if Loader.StartLoading is later called.
This updates the Loader's internal state so that Loader.IsStarted will return the correct value, and then calls the implementation's Loader.OnStopLoading.
Must be called from the process's main thread.