protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.activity_style_classics);

            mToolbar = FindViewById <Toolbar>(Resource.Id.toolbar);
            mToolbar.NavigationClick += (sender, e) => { Finish(); };

            mRefreshLayout = FindViewById(Resource.Id.refreshLayout) as IRefreshLayout;

            int deta = new System.Random().Next(7 * 24 * 60 * 60 * 1000);

            mClassicsHeader = (ClassicsHeader)mRefreshLayout.RefreshHeader;
            mClassicsHeader.SetLastUpdateTime(new Date(Java.Lang.JavaSystem.CurrentTimeMillis() - deta));
            mClassicsHeader.SetTimeFormat(new SimpleDateFormat("更新于 MM-dd HH:mm", Locale.China));
            mClassicsHeader.SetTimeFormat(new DynamicTimeFormat("更新于 %s"));

            var recyclerView = FindViewById <RecyclerView>(Resource.Id.recyclerView);

            recyclerView.SetItemAnimator(new DefaultItemAnimator());
            recyclerView.SetLayoutManager(new LinearLayoutManager(this));
            recyclerView.AddItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.Vertical));
            recyclerView.SetAdapter(new CustomBaseRecyclerAdapter(Item.List, Android.Resource.Layout.SimpleListItem2, this));

            if (isFirstEnter)
            {
                isFirstEnter = false;
                //触发上啦加载
                mRefreshLayout.AutoLoadmore();
                //通过多功能监听接口实现 在第一次加载完成之后 自动刷新
                mRefreshLayout.SetOnMultiPurposeListener(new CustomSimpleMultiPurposeListener());
            }
        }
            public IRefreshHeader CreateRefreshHeader(Context context, IRefreshLayout layout)
            {
                ClassicsHeader header = new ClassicsHeader(context).SetSpinnerStyle(SpinnerStyle.FixedBehind);

                header.SetPrimaryColors(ContextCompat.GetColor(context, Resource.Color.colorPrimary), ContextCompat.GetColor(context, Android.Resource.Color.White));
                return(header);//指定为经典Header,默认是 贝塞尔雷达Header
            }