Question

I think I understand how loaders are supposed to work, etc, but I’m not quite sure how a Loader would signal to the LoaderManager, or to the application, that it did not complete successfully. What is the best way to do this?

Answer 1

There is no built-in way. Catch all exceptions, and return some class that has an optional Exception error field. Check if the exception is null to see if the call succeeded. Something like:

public class LoaderResult<T> {

    private T data;
    private Exception error;

    private LoaderResult(T data, Exception error) {
        this.data = data;
        this.error = error;
    }
}