copyed from http://51up.club/2015/10/13/SwipeRefreshLayout-RecyclerView-%E5%AE%9E%E7%8E%B0%E4%B8%8B%E6%8B%89%E5%88%B7%E6%96%B0%E5%92%8C%E4%B8%8A%E6%8B%89%E5%8A%A0%E8%BD%BD%E6%9B%B4%E5%A4%9A/

SwipeRefreshlayout上拉监听

mRecyclerView= (RecyclerView) findViewById(R.id.recyclerview);
layoutManager=new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(layoutManager);
mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST));
adapter=new SimpleAdapter(this,mDatas);
mRecyclerView.setAdapter(adapter);
mSwipeRefreshLayout= (SwipeRefreshLayout) findViewById(R.id.swiperefreshlayout);
mSwipeRefreshLayout.setColorSchemeResources(android.R.color.holo_blue_bright, android.R.color.holo_green_light,
        android.R.color.holo_orange_light, android.R.color.holo_red_light);
 //此处是android自带的只支持下拉刷新
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
    @Override
    public void onRefresh() {
        handler.sendEmptyMessageDelayed(MSG_COMPLETE, 3000);
    }
});
//此处我们是对recyclerview添加scrollListener ,监听滑倒最后一个可见的条目的时候，刷新加载数据
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        super.onScrollStateChanged(recyclerView, newState);
         //SCROLL_STATE_DRAGGING  和   SCROLL_STATE_IDLE 两种效果自己看着来
        if(newState == RecyclerView.SCROLL_STATE_IDLE && lastVisibleItem + 1 == adapter.getItemCount()){
            mSwipeRefreshLayout.setRefreshing(true);
            handler.sendEmptyMessageDelayed(MSG_COMPLETE,3000);
        }
    }

    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);
        lastVisibleItem=layoutManager.findLastVisibleItemPosition();
    }
});