各个方法可以实现Asynctask吗？

Question

Even if the class they reside in doesn't implement it?

Answer 1

No. Nor can the containing class implement AsyncTask. AsyncTask is an abstract superclass, not an interface, so you extend it rather than implement it.

But regardless, a method cannot extend a class or implement an interface. However, you might be able to use an anonymous class to provide an AsyncTask implementation that just calls your method at the appropriate place.