Android一点 RecyclerView上拉刷新

SwipeRefreshLayout只有下拉刷新的功能，和RecyclerView一起使用的时候，我们需要上拉加载更多，这里RecyclerView有个addOnScrollListener的监听，我们在这个监听可以监听是否滑动到底部，但是这里我们做了一个限制，需要数据满一屏幕才加载更多数据

package com.test.activity;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.RecyclerView.OnScrollListener;import android.support.v7.widget.StaggeredGridLayoutManager;/** * 滚动监听器 *  * @author Flyjun * */public class LoadScrollListener extends OnScrollListener implements        onLoadListener {    private String TAG = getClass().getSimpleName();    // 定义RecyclerView类型枚举    public static enum LAYOUT_MANAGER_YTPE {        LINEAR, GRID, STAGGERED_GRID    }    // layoutManager的类型（枚举）    protected LAYOUT_MANAGER_YTPE layoutManagerType;    // 最后一个位置    private int[] lastPositions;    // 最后一个可见Item的位置    private int lastVisibleItemPosition;    // 是否正在加载    public boolean isLoadingMore = false;    // 当前滑动的状态    private int currentScrollState = 0;    @Override    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {        // TODO Auto-generated method stub        super.onScrolled(recyclerView, dx, dy);        RecyclerView.LayoutManager layoutManager = recyclerView                .getLayoutManager();        if (layoutManagerType == null) {            // 判断RecyclerView的类型            if (layoutManager instanceof LinearLayoutManager) {                layoutManagerType = LAYOUT_MANAGER_YTPE.LINEAR;            } else if (layoutManager instanceof GridLayoutManager) {                layoutManagerType = LAYOUT_MANAGER_YTPE.GRID;            } else if (layoutManager instanceof StaggeredGridLayoutManager) {                layoutManagerType = LAYOUT_MANAGER_YTPE.STAGGERED_GRID;            } else {                throw new RuntimeException(                        "Unsupported LayoutManager used. Valid ones are LinearLayoutManager, GridLayoutManager and StaggeredGridLayoutManager");            }        }        switch (layoutManagerType) {        case LINEAR:            lastVisibleItemPosition = ((LinearLayoutManager) layoutManager)                    .findLastVisibleItemPosition();            break;        case GRID:            lastVisibleItemPosition = ((GridLayoutManager) layoutManager)                    .findLastVisibleItemPosition();            break;        case STAGGERED_GRID:            StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;            if (lastPositions == null) {                lastPositions = new int[staggeredGridLayoutManager                        .getSpanCount()];            }            staggeredGridLayoutManager                    .findLastVisibleItemPositions(lastPositions);            lastVisibleItemPosition = findMax(lastPositions);            break;        default:            break;        }    }    @Override    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {        // TODO Auto-generated method stub        super.onScrollStateChanged(recyclerView, newState);        currentScrollState = newState;        RecyclerView.LayoutManager layoutManager = recyclerView                .getLayoutManager();        // 返回附着于母RecyclerView子视图当前数量。(可以看见RecyclerView中视图的数量)        int visibleItemCount = layoutManager.getChildCount();        // 返回结合到母体RecyclerView适配器的项数。(RecyclerView中视图的总数量)        int totalItemCount = layoutManager.getItemCount();        // 条件：当前可见视图数量 > 0 &&满一屏幕 && RecyclerView的状态为静止(没有滑动) && 滑动到视图的底部        if (visibleItemCount > 0 && totalItemCount>visibleItemCount                && currentScrollState == RecyclerView.SCROLL_STATE_IDLE                && (lastVisibleItemPosition) >= totalItemCount - 1) {            onLoad();        }// 条件： 当前可见视图数量 > 0 && RecyclerView的状态为静止        else if (visibleItemCount > 0                && currentScrollState == RecyclerView.SCROLL_STATE_IDLE) {            // loadImage();        }    }    private int findMax(int[] lastPositions) {        int max = lastPositions[0];        for (int value : lastPositions) {            if (value > max) {                max = value;            }        }        return max;    }    @Override    public void onLoad() {        // TODO Auto-generated method stub    }    // @Override    // public void loadImage() {    // // TODO Auto-generated method stub    //    // }}

/** * 加载更多回调 */public interface onLoadListener{    public void onLoad();}

加入监听

recyclerView.addOnScrollListener(new LoadScrollListener() {        @Override        public void onLoad() {            // TODO Auto-generated method stub            super.onLoad();            /**             * 如果不是正在刷新，则加载更多             */            if(!swipeRefreshLayout.isRefreshing()){               Logger.debug("-----onLoad------");            }        }    });