3秒钟不懂你砍我：RecyclerView下拉刷新和上拉加载更多

借鉴自：http://blog.csdn.net/jerrywu145/article/details/52225898

先直接写可以拿去用的东西。

1.下拉刷新 SwipeRefreshLayout

2.上拉加载更多 RecyclerView.OnScrolListener

下拉刷新

布局

<android.support.v4.widget.SwipeRefreshLayout    android:id="@+id/swipeRefreshLayout"    android:layout_width="match_parent"    android:layout_height="wrap_content">    <android.support.v7.widget.RecyclerView        android:id="@+id/recyclerView"        android:layout_width="match_parent"        android:layout_height="match_parent" /></android.support.v4.widget.SwipeRefreshLayout>

使用

@BindView(R.id.recyclerView)RecyclerView mRecyclerView;@BindView(R.id.swipeRefreshLayout)SwipeRefreshLayout mSwipeRefreshLayout;

mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {    @Override    public void onRefresh() {        //这里写你请求最新数据的操作    }});

上拉加载更多

先增加一个类，重写onScrolled方法，直接拷贝即可，不用修改

public abstract class EndlessRecyclerOnScrollListener extends        RecyclerView.OnScrollListener {    private int previousTotal = 0;    private boolean loading = true;    int firstVisibleItem, visibleItemCount, totalItemCount;    private int currentPage = 1;    private LinearLayoutManager mLinearLayoutManager;    public EndlessRecyclerOnScrollListener(            LinearLayoutManager linearLayoutManager) {        this.mLinearLayoutManager = linearLayoutManager;    }    @Override    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {        super.onScrolled(recyclerView, dx, dy);        visibleItemCount = recyclerView.getChildCount();        totalItemCount = mLinearLayoutManager.getItemCount();        firstVisibleItem = mLinearLayoutManager.findFirstVisibleItemPosition();        if (loading) {            if (totalItemCount > previousTotal) {                loading = false;                previousTotal = totalItemCount;            }        }        if (!loading                && (totalItemCount - visibleItemCount) <= firstVisibleItem) {            currentPage++;            onLoadMore(currentPage);            loading = true;        }    }    public abstract void onLoadMore(int currentPage);}

使用

mRecyclerView.addOnScrollListener(new EndlessRecyclerOnScrollListener(linearLayoutManager) {    @Override    public void onLoadMore(int currentPage) {        //这里是你请求历史数据的操作    }});

至于真正的请求数据的业务，我放在了下一篇文章中，下一篇才是重中之重，我会拿开源中国的开源资讯举例，带你了解真实的业务流程。