package com.example.qyh.joe.theme.callback; public interface ISkinChangingCallback { void onStart(); void onError(Exception e); void onComplete(); public static DefaultSkinChangingCallback DEFAULT_SKIN_CHANGING_CALLBACK = new DefaultSkinChangingCallback(); public class DefaultSkinChangingCallback implements ISkinChangingCallback { @Override public void onStart() { } @Override public void onError(Exception e) { } @Override public void onComplete() { } } }