上拉加载 下拉刷新

SwipeRefreshLayout swipe = findViewById(R.id.swipe);

linearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);

//监听 swipe.setOnRefreshListener(this);

让activity实现 implements SwipeRefreshLayout.OnRefreshListener

 //上拉加载更多监听
        recycler.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
            }

            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);

                int childCount = recycler.getChildCount();
                int itemCount = linearLayoutManager.getItemCount();
                int firstVisibleItemPosition = linearLayoutManager.findFirstVisibleItemPosition();
                if (firstVisibleItemPosition + childCount == itemCount) {
                    initData();
                    adapter.notifyDataSetChanged();
                }
            }
        });

@Override
    public void onRefresh() {
        //延时刷新
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                //停止刷新
                swipe.setRefreshing(false);
            }
        },2000);
    }

@Override
    protected void initData() {
        String path = "https://www.zhaoapi.cn/ad/getAd";
        presenter.getData(path);
    }