//最后显示的项

mLastVisibleItem = mLayoutManager.findLastCompletelyVisibleItemPosition();

int totalItemCount = mLayoutManager.getItemCount();

/**

• 只有在下拉，并且没有早加载更多，并且允许加载更多，并且在最后一个条目，才调用加载更多的接口

*/

if (mDy >= 0 && !isLoadMore && (mLastVisibleItem >= totalItemCount - 1) &&

enableLoadMore) {

loadMore();

}

}

2 下面给出源码

public class PulltoRefreshRecyclerView extends LinearLayout {

String Tag = “xujun”;

/**

• 内容控件

*/

private RecyclerView mRecyclerView;

/**

• 刷新布局控件

*/

private SwipeRefreshLayout mSwipeRfl;

private LinearLayoutManager mLayoutManager;

/*

• 刷新布局的监听

*/

private OnRefreshListener mRefreshListener;

/**

• 内容控件滚动监听

*/

private RecyclerView.OnScrollListener mScrollListener;

/*

• 刷新加载监听事件

*/

private onRefreshListener mRefreshLoadMoreListner;

/**

• 是否正在刷新

*/

private boolean isRefresh = false;

/**

• 是否正在加载更多

*/

private boolean isLoadMore = false;

private FrameLayout mFootView;

// 是否允许加载更多

private boolean enableLoadMore = true;

private int mMeasuredHeight;

public PulltoRefreshRecyclerView(Context context) {

this(context, null);

}

@SuppressWarnings(“deprecation”)

public PulltoRefreshRecyclerView(Context context, AttributeSet attrs) {

super(context, attrs);

// 导入布局

initView(context);

/**

• 监听上拉至底部滚动监听

*/

initListener();

mRecyclerView.setHasFixedSize(true);

mLayoutManager = new LinearLayoutManager(context);

mRecyclerView.setLayoutManager(mLayoutManager);

mRecyclerView.setOnScrollListener(mScrollListener);

}

private void setFootViewHeight(int height) {

ViewGroup.LayoutParams layoutParams = mFootView.getLayoutParams();

layoutParams.height = height;

mFootView.setLayoutParams(layoutParams);

}

private void initListener() {

mScrollListener = new RecyclerView.OnScrollListener() {

private int mLastVisibleItem;

private int mDy;

@Override

public void onScrollStateChanged(RecyclerView recyclerView, int newState) {

super.onScrollStateChanged(recyclerView, newState);

if (newState != RecyclerView.SCROLL_STATE_IDLE) {

return;

}

//最后显示的项

mLastVisibleItem = mLayoutManager.findLastCompletelyVisibleItemPosition();

int totalItemCount = mLayoutManager.getItemCount();

/**

• 只有在下拉，并且没有早加载更多，并且允许加载更多，并且在最后一个条目，才调用加载更多的接口

*/

if (mDy >= 0 && !isLoadMore && (mLastVisibleItem >= totalItemCount - 1) &&

enableLoadMore) {

loadMore();

}

}

@Override

public void onScrolled(RecyclerView recyclerView, int dx, int dy) {

super.onScrolled(recyclerView, dx, dy);

mDy = dy;

}

};

/**

• 下拉至顶部刷新监听

*/

mRefreshListener = new OnRefreshListener() {

@Override

public void onRefresh() {

/* Log.i(“Tag”, “onRefresh1”);

Log.i(“Tag”, isRefresh + “”);

Log.i(“Tag”, isRefresh + “”);

Log.i(“Tag”, isLoadMore + “”);*/

LUtils.i(“isLoadMore=” + isLoadMore);

if (!isRefresh && !isLoadMore) {//没有正在刷新或者正在加载更多

isRefresh = true;

refresh();

}

}

};

mSwipeRfl.setOnRefreshListener(mRefreshListener);

}

private void initView(Context context) {

View.inflate(context, R.layout.pulltorefreshrecyclerview,this);

mSwipeRfl = (SwipeRefreshLayout) findViewById(R.id.all_swipe);

mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);

initFootView();

}

private void initFootView() {

mFootView = (FrameLayout) findViewById(R.id.ll_load_more);

LUtils.i(“mFootView=” +(mFootView==null));

mFootView.measure(0, 0);

mMeasuredHeight = mFootView.getMeasuredHeight();

setFootViewHeight(0);

}

public void setFooterView(View view) {

if (getFooterView() != null) {

getFooterView().removeAllViews();

mFootView.addView(view);

}

}

public FrameLayout getFooterView() {

return mFootView;

}

public RecyclerView getRecyclerView() {

return mRecyclerView;

}

public void setLayoutManager(LayoutManager layoutManager) {

if (mRecyclerView != null) {

mRecyclerView.setLayoutManager(layoutManager);

}

}

/**

• 设置是否允许下拉刷新

• @param enable

*/

public void setPullRefreshEnable(boolean enable) {

setRefreshEnabled(enable);

}

public boolean getPullRefreshEnable() {

return mSwipeRfl.isEnabled();

}

public void setLoadMoreListener() {

mRecyclerView.setOnScrollListener(mScrollListener);

}

public void loadMore() {

if (mRefreshLoadMoreListner != null) {

isLoadMore = true;

//设置在加载更多的时候swipeLayout不允许加载更多，同时需要设置在加载更多完毕的时候允许swipeLayout加载更多

setRefreshEnabled(false);

mLayoutManager.scrollToPosition(mLayoutManager.findLastVisibleItemPosition());

showFootView();

mRefreshLoadMoreListner.onLoadMore(mRecyclerView);

}

}

public void setRefreshEnabled(boolean enabled) {

mSwipeRfl.setEnabled(enabled);

}

private void showFootView() {

setFootViewHeight(mMeasuredHeight);

}

public void OnRefreshCompleted() {

if (isRefresh) {//如果是正在刷新，就调用这个方法

stopRefresh();

} else if (isLoadMore) {//如果是正在加载更多，就调用这个方法

setLoadMoreCompleted();

}

}

/**

• 加载更多完毕,为防止频繁网络请求,isLoadMore为false才可再次请求更多数据

*/

private void setLoadMoreCompleted() {

//因为在加载更多的时候设置swipeLayout不允刷新，

// 所以加载更多完毕的时候需要设置允许swipeLayout允许刷新

setRefreshEnabled(true);

最后

本文在开源项目GitHub中已收录，里面包含不同方向的自学编程路线、面试题集合/面经、及系列技术文章等，资源持续更新中…

目前已经更新的部分资料，需要的自己取：

完毕的时候需要设置允许swipeLayout允许刷新

setRefreshEnabled(true);

最后

本文在开源项目GitHub中已收录，里面包含不同方向的自学编程路线、面试题集合/面经、及系列技术文章等，资源持续更新中…

目前已经更新的部分资料，需要的自己取：

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[外链图片转存中…(img-hw0Dft32-1644043372658)]
[外链图片转存中…(img-bETjWgVv-1644043372658)]