自己封装的工具类，使用原生SwipeRefreshLayout+RecycleView实现下拉刷新和加载更多

Posted 2020-08-09

实现SwipeRefreshLayout+RecycleView实现刷新

在你的xml文件里写上如下代码：

<android.support.v4.widget.SwipeRefreshLayout
            android:id="@+id/SwipeRefreshLayout"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <android.support.v7.widget.RecyclerView
                android:id="@+id/recyclerView"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:cacheColorHint="#00000000"
                android:overScrollMode="never"
                android:scrollbars="none"/>
        </android.support.v4.widget.SwipeRefreshLayout>

在你的Activity或Fragment实现RecyclerViewLoadMoreUtil.RefreshDataListener刷新接口并调用以下代码初始化：

这里的init()方法中的
参数一：content
参数二：SwipeRefreshLayout控件
参数三：RecyclerView控件
参数四：继承RecyclerView.Adapter的adapter，这里可以使用我另外写的一篇关于adapter的封装 
参数五：刷新接口，这里如果在Activity或Fragment实现RecyclerViewLoadMoreUtil.RefreshDataListener就可以在此处填this了

recyclerViewLoadMoreUtil = new RecyclerViewLoadMoreUtil();
        recyclerViewLoadMoreUtil.init(mContext, mSwipeRefreshLayout, mRecyclerView, mAdapter, this);
        recyclerViewLoadMoreUtil.setColorSchemeResources(R.color.yellow_press, R.color.green, R.color.red);
        recyclerViewLoadMoreUtil.autoRefreshing();//第一次自动加载一次
        ....
 @Override
    public void onRefresh() {
        recyclerViewLoadMoreUtil.endRefreshing();
        //Do the things you want to do
    }    
 @Override
    public boolean loadMore() {
        recyclerViewLoadMoreUtil.endLoading();
        //Do the things you want to do
        return true;
    }

以下是该刷新工具类的全部代码

/**
 * Created by xiongxuesong-pc on 2016/6/17.
 * 配合原生RecyclerVew和SwipeRefreshLayout加载更多
 */
public class RecyclerViewLoadMoreUtil {
    protected Context mContext;
    protected SwipeRefreshLayout mSwipeRefreshLayout;
    protected RecyclerView mRecyclerView;
    protected RecyclerView.Adapter mAdapter;
    protected RefreshDataListener mRefreshDataListener;
    private boolean mIsRefresh = true;//是否禁止下拉刷新，默认是不禁止下拉刷新
    private boolean mIsLoadMore = true;//是否禁止上拉刷新，默认是不禁止上拉刷新
    private boolean isSlidingToScreenBottom = false;//用来标记是否正在向最后一个滑动，既是否向右滑动或向下滑动

    public RecyclerViewLoadMoreUtil() {

    }

    public void init(final Context context, final SwipeRefreshLayout swipeRefreshLayout, RecyclerView recyclerView, final RecyclerView.Adapter adapter, final RefreshDataListener refreshDataListener) {
        initConfig(context, swipeRefreshLayout, recyclerView, adapter, refreshDataListener);
        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                boolean isRefreshing = swipeRefreshLayout.isRefreshing();
                if (isRefreshing) {
                    refreshDataListener.onRefresh();
                }
            }
        });

        final LinearLayoutManager layoutManager = new LinearLayoutManager(context);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {

            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                LinearLayoutManager manager = (LinearLayoutManager) recyclerView.getLayoutManager();
                // 当不滚动时
                boolean idleFlag = newState == RecyclerView.SCROLL_STATE_IDLE;
                if (idleFlag) {
                    //获取最后一个完全显示的ItemPosition
                    int lastVisibleItem = manager.findLastCompletelyVisibleItemPosition();
                    int totalItemCount = mAdapter.getItemCount();

                    // 判断是否滚动到屏幕底部，并且是向右滚动
                    if (lastVisibleItem == (totalItemCount - 1) && isSlidingToScreenBottom) {
                        if (mScrolledBottomListener != null) {
                            mScrolledBottomListener.ScrolledBottom(recyclerView);
                        }

                        if (mIsLoadMore) {//可以加载更多
                            mSwipeRefreshLayout.setEnabled(false);//禁止使用下拉刷新
                            mRefreshDataListener.loadMore();
                            Log.d("TAG", "howes right=" + manager.findLastCompletelyVisibleItemPosition());
//                                Toast.makeText(mContext, "加载更多", Toast.LENGTH_SHORT).show();
                        } else {
//                            Toast.makeText(mContext, "不能加载更多", Toast.LENGTH_SHORT).show();
                        }
                    }
                }
            }

            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                Log.d("TAG", "dy=" + dy);
                //dx用来判断横向滑动方向，dy用来判断纵向滑动方向
                //当列表项的总高度小于屏幕，即不会滚动列表时，dx、dy都等于0
                if (dy > 0) {
                    //大于0表示，正在向右滚动，向上滚动
                    isSlidingToScreenBottom = true;
                } else {
                    //小于等于0 表示停止或向左滚动，向下滚动
                    isSlidingToScreenBottom = false;
                }
                if (mScrollingListener != null) {
                    mScrollingListener.scroll(isSlidingToScreenBottom);
                }
            }
        });
    }

    private void initConfig(Context context, SwipeRefreshLayout swipeRefreshLayout, RecyclerView recyclerView, RecyclerView.Adapter adapter, RefreshDataListener refreshDataListener) {
        this.mContext = context;
        this.mSwipeRefreshLayout = swipeRefreshLayout;
        this.mRecyclerView = recyclerView;
        this.mAdapter = adapter;
        this.mRefreshDataListener = refreshDataListener;
    }

    /**
     * 首次进入页面可以自动加载，要使用必须在{@link #init(Context, SwipeRefreshLayout, RecyclerView, RecyclerView.Adapter, RefreshDataListener)}
     * 之后调用
     */
    public void autoRefreshing() {
        mSwipeRefreshLayout.post(new Runnable() {
            @Override
            public void run() {
                mSwipeRefreshLayout.setRefreshing(true);
                mRefreshDataListener.onRefresh();
            }
        });
    }

    /**
     * 要使用必须在{@link #init(Context, SwipeRefreshLayout, RecyclerView, RecyclerView.Adapter, RefreshDataListener)}
     * 之后调用
     *
     * @param colorResIds
     */
    public void setColorSchemeResources(@ColorRes int... colorResIds) {
        mSwipeRefreshLayout.setColorSchemeResources(colorResIds);
    }

    public void endRefreshing() {
        mSwipeRefreshLayout.setRefreshing(false);
    }

    public void endLoading() {
        if (mIsRefresh) {//如果之前已经设置过禁止下拉刷新，此时不应该在设置成可下拉刷新
            setPullDownRefreshEnable(true);//可以使用下拉刷新
        } else {//如果之前已经设置过禁止下拉刷新，此时不应该在设置成可下拉刷新
            setPullDownRefreshEnable(false);//不可以使用下拉刷新
        }
    }

    /**
     * 设置列表是否禁止下拉刷新，是否显示下拉刷新动画只能通过该方法设置
     *
     * @param isRefresh true 可以使用下拉刷新；false 不可以使用下拉刷新
     */
    public void setPullDownRefreshEnable(boolean isRefresh) {
        mIsRefresh = isRefresh;
        mSwipeRefreshLayout.setEnabled(isRefresh);
    }

    /**
     * 设置列表是否禁止上拉刷新
     *
     * @param isLoadMore true 可以使用上拉刷新；false 不可以使用上拉刷新
     */
    public void setPullUpRefreshEnable(boolean isLoadMore) {
        mIsLoadMore = isLoadMore;
    }

    public interface RefreshDataListener {
        void onRefresh();

        boolean loadMore();
    }

    private ScrollingListener mScrollingListener;

    public interface ScrollingListener {
        /**
         * true 向上滚动；false 向下滚动
         *
         * @param scrollState
         */
        void scroll(boolean scrollState);
    }

    public void setScrollingListener(ScrollingListener listener) {
        mScrollingListener = listener;
    }

    private ScrolledBottomListener mScrolledBottomListener;

    public interface ScrolledBottomListener {
        /**
         * 列表滚动到屏幕底部时调用
         *
         * @param recyclerView
         */
        void ScrolledBottom(RecyclerView recyclerView);
    }

    public void setScrollingListener(ScrolledBottomListener listener) {
        mScrolledBottomListener = listener;
    }

}

这是本人从项目中抽取出来的，暂时没在项目中出现问题，希望能帮助到你。

转载请注明出处，谢谢！