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Android RecyclerView 上拉加載更多及下拉刷新功能的實(shí)現(xiàn)方法

 更新時(shí)間：2016年09月17日 10:32:49   作者：清淺歲月  
這篇文章主要介紹了Android RecyclerView 上拉加載更多及下拉刷新的相關(guān)資料,非常不錯(cuò)，具有參考借鑒價(jià)值，需要的朋友可以參考下

RecyclerView 已經(jīng)出來很久了，但是在項(xiàng)目中之前都使用的是ListView，最近新的項(xiàng)目上了都大量的使用了RecycleView.尤其是瀑布流的下拉刷新，網(wǎng)上吧啦吧啦沒有合適的自己總結(jié)了一哈。

先貼圖上來看看：

這里寫圖片描述 

 
這里寫圖片描述

使用RecyclerView實(shí)現(xiàn)上拉加載更多和下拉刷新的功能我自己有兩種方式：

1.使用系統(tǒng)自帶的Android.support.v4.widget.SwipeRefreshLayout這個(gè)控價(jià)來實(shí)現(xiàn)。

2.自定義的里面帶有RecyleView的控件。

使用RecycleView很不好添加頭部，之前在使用listview當(dāng)中自己可以添加header和bootm，但是RecycleView好像不是那么的好操作。對(duì)于第一種使用系統(tǒng)自帶的Android.support.v4.widget.SwipeRefreshLayout來實(shí)現(xiàn)的，也很好用，但是產(chǎn)品一般不要這種下拉刷新，為了讓自己顯得牛逼，他一般會(huì)搞一個(gè)自己的帶有動(dòng)畫，這就比較扯淡了。。。所以就只能用方法2了。

大致說一哈方法2的實(shí)現(xiàn)方式，父布局為ViewGroup,里面添加View第一個(gè)為控件為header第二個(gè)控件為RecycleView，至于最底部的下拉加載更多試圖，通過RecycleViw的Adapter來添加。

有了思路就搞起來：

package com.krain.srecyclerview.fruitview;
import android.content.Context;
import android.graphics.drawable.AnimationDrawable;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;
import com.krain.srecyclerview.R;
/**
* Created by dafuShao on 2016/9/9 0009.
*
*/
public class ElizabethView extends FrameLayout {
private ImageView imageView;
private AnimationDrawable animationDrawable;
public ElizabethView(Context context) {
super(context);
initview(context);
}
public ElizabethView(Context context, AttributeSet attrs) {
super(context, attrs);
initview(context);
}
public ElizabethView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initview(context);
}
private void initview(Context context){
View view= LayoutInflater.from(context).inflate(R.layout.elizabeth_item,null);
imageView=(ImageView) view.findViewById(R.id.elizabeth_im);
animationDrawable= (AnimationDrawable) imageView.getBackground();
addView(view);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
//開始動(dòng)畫
public void startAnim(){
animationDrawable.start();
}
//停止動(dòng)畫
public void stopAnim(){
animationDrawable.stop();
}
}

這是頭部控價(jià)很簡單里面有一個(gè)小的臭蛋眼睛左右擠一哈的效果就不貼圖了。

下面是自定義的包含RecyclerView的控件代碼如下：

package com.krain.srecyclerview.srecyclerview;
import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.MotionEventCompat;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.Scroller;
import android.widget.TextView;
import com.krain.srecyclerview.R;
import com.krain.srecyclerview.fruitview.ElizabethView;
public class SRecyclerView extends ViewGroup {
Context context;
RecyclerView mRecyclerView;
ElizabethView mHeaderView;
TextView mFootViewTips;//footview的文字顯示
AdapterWrapper mAdapter;
boolean mIsTop = true;//是否滑動(dòng)到了最頂部
RecyclerView.LayoutManager mLayoutManager;
int mLastVisibleItem;
int mFirstVisibleItem;
OnRecyclerStatusChangeListener mRecyclerChangeListener;
int mStatus;//當(dāng)前狀態(tài)
int mHeadviewHeight;//headview的高度
Scroller mScroller;
int mFristScollerY;//最開始的getscrolly
boolean mHasFooter;//是否有上拉加載的功能
boolean mShowFootVisible;//是否顯示FOOTERview在mHasFooter為true的時(shí)候生效
boolean mHasRefresh = true;//是否支持下拉刷新
private final int DEFAULT_MIN_PAGEINDEX = 1;//默認(rèn)最小的頁數(shù)
int mMaxPage = DEFAULT_MIN_PAGEINDEX;//分頁的總頁數(shù)
int mCurrentPage = DEFAULT_MIN_PAGEINDEX;//當(dāng)前的頁數(shù)，從1開始
private final int STATUS_NORMAL = 0, STATUS_REFRESH = 1, STATUS_LOAD = 2;
private final int MSG_LOAD_COMPLETE = 1, MSG_REFRESH_COMPLETE = 0;//handle的常量
private final int DELAY_LOAD_COMPLETE = 1000, DELAY_REFRESH_COMPLETE = 1000;//加載完成延時(shí)回收的時(shí)間
public SRecyclerView(Context context) {
super(context);
init(context);
}
public SRecyclerView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public SRecyclerView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
/**
* 設(shè)置最大頁數(shù)
*
* @param maxPage
*/
public void setMaxPage(int maxPage) {
this.mMaxPage = maxPage;
}
/**
* 是否支持上拉加載
*
* @param hasLoadmore
*/
public void setLoadmore(boolean hasLoadmore) {
mHasFooter = hasLoadmore;
}
public void setRecyclerViewLayoutManage(RecyclerView.LayoutManager mLayoutManage){
this.mLayoutManager=mLayoutManage;
}
/**
* 關(guān)閉下拉刷新功能
*/
public void disableRefresh() {
mHasRefresh = false;
}
public void setAdapter(BaseRecyclerViewAdapter adapter) {
int height = 0;
if (mMaxPage == DEFAULT_MIN_PAGEINDEX) {
mHasFooter = false;
}
mAdapter = new AdapterWrapper(context, adapter);
mRecyclerView.setAdapter(mAdapter);
}
private int getViewHeight(View view) {
int measure = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
view.measure(measure, measure);
return view.getMeasuredHeight();
}
/**
* 獲取viewgroup里面的recyclerview
*
* @return
*/
public RecyclerView getRecyclerView() {
return mRecyclerView;
}
public void setOnRecyclerChangeListener(OnRecyclerStatusChangeListener listener) {
mRecyclerChangeListener = listener;
}
/**
* 設(shè)置RecyclerView添加、刪除Item的動(dòng)畫
*
* @param animator
*/
public void setItemAnimator(RecyclerView.ItemAnimator animator) {
mRecyclerView.setItemAnimator(animator);
}
public void notifyDataSetChanged() {
mStatus = STATUS_NORMAL;//重新set數(shù)據(jù)代表loadmore結(jié)束了，此時(shí)恢復(fù)成普通狀態(tài)
mAdapter.notifyDataSetChanged();
}
public void notifyDataInsert(int positionStart, int itemCount) {
mStatus = STATUS_NORMAL;//重新set數(shù)據(jù)代表loadmore結(jié)束了，此時(shí)恢復(fù)成普通狀態(tài)
mAdapter.notifyItemRangeInserted(positionStart, itemCount);
}
public void notifyDataRemove(int position) {
mStatus = STATUS_NORMAL;//重新set數(shù)據(jù)代表loadmore結(jié)束了，此時(shí)恢復(fù)成普通狀態(tài)
mAdapter.notifyItemRemoved(position);
}
/**
* 初始化操作
*
* @param context
*/
void init(Context context) {
this.context = context;
mScroller = new Scroller(context);
// if (mLayoutManager!=null){
// addChildView(context,mLayoutManager);
// }else{
// addChildView(context, new LinearLayoutManager(context));
// }
addChildView(context);
}
@Override
public void computeScroll() {
if (mScroller.computeScrollOffset()) {
scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
postInvalidate();
}
}
/**
* 增加子View
*
* @param context
*/
void addChildView(Context context, RecyclerView.LayoutManager mLayoutManager) {
ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
mHeaderView = new ElizabethView(context);
mRecyclerView = new RecyclerView(context);
addView(mHeaderView);
addView(mRecyclerView);
//mLayoutManager = new LinearLayoutManager(context);
// mLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(mLayoutManager);
// 設(shè)置Item增加、移除默認(rèn)動(dòng)畫
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
mRecyclerView.addOnScrollListener(onScrollListener);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutParams(params);
}
void addChildView(Context contex) {
ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
mHeaderView = new ElizabethView(context);
mRecyclerView = new RecyclerView(context);
addView(mHeaderView);
addView(mRecyclerView);
//mLayoutManager = new LinearLayoutManager(context);
mLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(mLayoutManager);
// 設(shè)置Item增加、移除默認(rèn)動(dòng)畫
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
mRecyclerView.addOnScrollListener(onScrollListener);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutParams(params);
}
/**
* 屏蔽Recyclerview的觸摸事件（下拉刷新的時(shí)候）
*/
float lastY;
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
final int action = MotionEventCompat.getActionMasked(ev);
switch (action) {
case MotionEvent.ACTION_DOWN:
lastY = ev.getRawY();
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
return false;
case MotionEvent.ACTION_MOVE:
if (mHasRefresh && mIsTop && ev.getRawY() > lastY)
return true;
break;
}
return false;
}
float offsetY = 0;
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE:
offsetY = Math.abs(event.getRawY() - lastY); //Y差值絕對(duì)值
if (offsetY > 0)
scrollToOffset(offsetY);
else {
mIsTop = false;
}
break;
case MotionEvent.ACTION_UP:
if (getScrollY() <= 0) {
doRefresh();
mHeaderView.stopAnim();
mHeaderView.startAnim();
} else complete();
break;
}
return super.onTouchEvent(event);
}
/**
* 滾動(dòng)這個(gè)view到手滑動(dòng)的位置
*
* @param offsetY Y軸偏移量
*/
void scrollToOffset(float offsetY) {
//假如正在刷新并且現(xiàn)在的scrolly和初始值一樣的時(shí)候，代表準(zhǔn)備下拉開始刷新，并執(zhí)行一次only
if (getScrollY() == mFristScollerY && mRecyclerChangeListener != null)
mRecyclerChangeListener.startRefresh();
int value = Math.round(offsetY / 2.0F);
value = mFristScollerY - value;
scrollTo(0, value);
}
/**
* 執(zhí)行刷新操作,移動(dòng)到header剛出來的位置
*/
void doRefresh() {
mStatus = STATUS_REFRESH;
int currentY = getScrollY();
mScroller.startScroll(0, currentY, 0, (mFristScollerY - mHeadviewHeight) - currentY);
invalidate();
if (mRecyclerChangeListener != null) mRecyclerChangeListener.onRefresh();
handler.sendEmptyMessageDelayed(MSG_REFRESH_COMPLETE, DELAY_REFRESH_COMPLETE);
}
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what == MSG_LOAD_COMPLETE) {
View footview = mAdapter.getFootView();
if (footview != null)
mRecyclerView.smoothScrollBy(0, -footview.getMeasuredHeight());
} else if (msg.what == MSG_REFRESH_COMPLETE)
complete();
}
};
/**
* header返回原處完全隱藏
*/
public void complete() {
mCurrentPage = DEFAULT_MIN_PAGEINDEX;//完成之后當(dāng)前的page恢復(fù)默認(rèn)值
if (mFootViewTips != null)
mFootViewTips.setText(context.getString(R.string.loading));//更改foot提示為正在加載中
if (mRecyclerChangeListener != null) mRecyclerChangeListener.refreshComplete();
mStatus = STATUS_NORMAL;
int currentY = getScrollY();
mScroller.startScroll(0, currentY, 0, mFristScollerY - currentY);
mHeaderView.stopAnim();
invalidate();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = 0;
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
measureChild(child, widthMeasureSpec, heightMeasureSpec);
height += child.getMeasuredHeight();
}
setMeasuredDimension(width, height);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
int left = getPaddingLeft();
int top = getPaddingTop();
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
if (i == 0) {//當(dāng)是header的時(shí)候居中顯示
int headerLeft = getMeasuredWidth() / 2 - child.getMeasuredWidth() / 2;
child.layout(headerLeft, top, headerLeft + child.getMeasuredWidth(), top + child.getMeasuredHeight());
} else
child.layout(left, top, left + child.getMeasuredWidth(), top + child.getMeasuredHeight());
top += child.getMeasuredHeight();
}
mHeadviewHeight = getPaddingTop() + mHeaderView.getMeasuredHeight();
scrollTo(0, mHeadviewHeight);//移動(dòng)到header下方以顯示recyleview
mFristScollerY = getScrollY();
}
/**
* RecyclerView的滑動(dòng)監(jiān)聽事件
*/
RecyclerView.OnScrollListener onScrollListener = new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == RecyclerView.SCROLL_STATE_IDLE) {
//滑動(dòng)到了頂部
if (mFirstVisibleItem == 0) {
mIsTop = true;
} else {
mIsTop = false;
if (mStatus != STATUS_LOAD && mShowFootVisible && mLastVisibleItem + 1 == mAdapter.getItemCount()) {
if (mCurrentPage == mMaxPage) {
//當(dāng)前頁面是最后一頁的時(shí)候
mFootViewTips = (TextView) mAdapter.getFootView().findViewById(R.id.footer_tips);
mFootViewTips.setText(context.getString(R.string.last_page_tips));
handler.sendEmptyMessageDelayed(MSG_LOAD_COMPLETE, DELAY_LOAD_COMPLETE);
} else {
mStatus = STATUS_LOAD;
if (mRecyclerChangeListener != null) {
mRecyclerChangeListener.onLoadMore();
mCurrentPage++;
}
}
}
}
}
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (mLayoutManager instanceof LinearLayoutManager) {
mLastVisibleItem = ((LinearLayoutManager) mLayoutManager).findLastVisibleItemPosition();
mFirstVisibleItem = ((LinearLayoutManager) mLayoutManager).findFirstCompletelyVisibleItemPosition();
setFootviewVisible();
} else if (mLayoutManager instanceof GridLayoutManager) {
mLastVisibleItem = ((GridLayoutManager) mLayoutManager).findLastVisibleItemPosition();
mFirstVisibleItem = ((GridLayoutManager) mLayoutManager).findFirstCompletelyVisibleItemPosition();
setFootviewVisible();
} else if (mLayoutManager instanceof StaggeredGridLayoutManager) {
//因?yàn)镾taggeredGridLayoutManager的特殊性可能導(dǎo)致最后顯示的item存在多個(gè)，所以這里取到的是一個(gè)數(shù)組
//得到這個(gè)數(shù)組后再取到數(shù)組中position值最大的那個(gè)就是最后顯示的position值了
int[] lastPositions = new int[((StaggeredGridLayoutManager) mLayoutManager).getSpanCount()];
((StaggeredGridLayoutManager) mLayoutManager).findLastVisibleItemPositions(lastPositions);
mLastVisibleItem = findMax(lastPositions);
mFirstVisibleItem = ((StaggeredGridLayoutManager) mLayoutManager).findFirstVisibleItemPositions(lastPositions)[0];
setFootviewVisible();
}
}
};
void setFootviewVisible() {
//當(dāng)設(shè)置了擁有上拉加載功能但是第一頁的條目不足以盛滿Recyclerview的時(shí)候隱藏footer
if (mHasFooter && mFirstVisibleItem == 0) {
/**
* 這里加上一個(gè)mShowFootVisible在上拉加載功能啟用的情況下生效，從來控制item數(shù)量不足鋪滿
* recyclerview高度的時(shí)刻隱藏footview，在item數(shù)量超過view高度的情況下顯示
*/
if (mLastVisibleItem + 1 == mAdapter.getItemCount()) {
mShowFootVisible = false;
} else mShowFootVisible = true;
notifyDataSetChanged();
}
}
private int findMax(int[] positions) {
int max = positions[0];
for (int value : positions) {
if (value > max) {
max = value;
}
}
return max;
}
private class AdapterWrapper extends RecyclerView.Adapter {
private static final int TYPE_ITEM = 0;
private static final int TYPE_FOOTER = 1;
private RecyclerView.Adapter mAdapter;
private Context mContext;
View footer;
public AdapterWrapper(Context context, RecyclerView.Adapter wrappedAdapter) {
this.mContext = context;
this.mAdapter = wrappedAdapter;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
RecyclerView.ViewHolder holder = null;
switch (viewType) {
case TYPE_ITEM:
holder = mAdapter.onCreateViewHolder(parent, viewType);
break;
case TYPE_FOOTER:
footer = LayoutInflater.from(mContext).inflate(R.layout.lib_recyle_footview, null);
LinearLayout linearLayout= (LinearLayout) footer.findViewById(R.id.loading_layout);
StaggeredGridLayoutManager.LayoutParams layoutParams =
new StaggeredGridLayoutManager.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
layoutParams.setFullSpan(true);
linearLayout.setLayoutParams(layoutParams);
holder = new FooterViewHolder(footer);
break;
}
return holder;
}
public View getFootView() {
return footer;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (!mHasFooter || position + 1 != getItemCount()) {
mAdapter.onBindViewHolder(holder, position);
}
}
@Override
public int getItemCount() {
return mShowFootVisible ? mAdapter.getItemCount() + 1 : mAdapter.getItemCount();
}
@Override
public int getItemViewType(int position) {
if (mShowFootVisible && position + 1 == getItemCount()) {
return TYPE_FOOTER;
} else {
return TYPE_ITEM;
}
}
private class FooterViewHolder extends RecyclerView.ViewHolder {
public ProgressBar progressBar;
public TextView tvLoading;
public LinearLayout llyLoading;
public FooterViewHolder(View itemView) {
super(itemView);
progressBar = (ProgressBar) itemView.findViewById(R.id.progress_loading);
tvLoading = (TextView) itemView.findViewById(R.id.footer_tips);
llyLoading = (LinearLayout) itemView.findViewById(R.id.loading_layout);
}
}
}
}

最后還有一個(gè)就是Adapter的代碼：

package com.krain.srecyclerview.srecyclerview;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
public abstract class BaseRecyclerViewAdapter<VH extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<VH> {
private OnItemClickLisener mItemListener;
@Override
public VH onCreateViewHolder(ViewGroup parent, int viewType) {
View view = getItemView(viewType, parent);
VH vh = getViewHolder(view);
view.setOnClickListener(new OnRecyclerAdapterclickListener(vh, viewType));
view.setOnLongClickListener(new OnRecyclerAdapterclickListener(vh, viewType));
return vh;
}
public abstract VH getViewHolder(View itemView);
/**
* 返回item的view
*
* @return
*/
public abstract View getItemView(int viewType, ViewGroup parent);
/**
* 返回Adapter每個(gè)itemn的數(shù)據(jù) 可選
*/
public Object getItem(int position) {
return null;
}
/**
* item點(diǎn)擊事件接口
*
* @param mItemListener
*/
public void setOnItemListener(OnItemClickLisener mItemListener) {
this.mItemListener = mItemListener;
}
@Override
public abstract void onBindViewHolder(VH holder, int position);
@Override
public abstract int getItemCount();
class OnRecyclerAdapterclickListener implements View.OnClickListener, View.OnLongClickListener {
VH viewholder;
int viewType;
public OnRecyclerAdapterclickListener(VH viewholder, int viewType) {
this.viewholder = viewholder;
this.viewType = viewType;
}
@Override
public void onClick(View v) {
if (mItemListener != null && viewholder.getAdapterPosition() != RecyclerView.NO_POSITION) {
mItemListener.onItemClick(viewholder.getAdapterPosition(), viewType, viewholder, v);
}
}
@Override
public boolean onLongClick(View v) {
if (mItemListener != null && viewholder.getAdapterPosition() != RecyclerView.NO_POSITION) {
mItemListener.onItemLongClick(viewholder.getAdapterPosition(), viewType, viewholder, v);
}
return false;
}
}
}

需要注意一哈：

如果想改變Reciview的布局方式在這個(gè)修改

void addChildView(Context contex) {
ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
mHeaderView = new ElizabethView(context);
mRecyclerView = new RecyclerView(context);
addView(mHeaderView);
addView(mRecyclerView);
//mLayoutManager = new LinearLayoutManager(context);
mLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(mLayoutManager);
// 設(shè)置Item增加、移除默認(rèn)動(dòng)畫
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
mRecyclerView.addOnScrollListener(onScrollListener);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutParams(params);
}

mLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);這一行就是了改成對(duì)應(yīng)的就可以了，這兒沒有封裝過幾天封裝一個(gè)出來。

還需要注意一哈就是在滑動(dòng)判斷是不是最后一行，如果是瀑布流就要注意哈判斷的方式和其他的不一樣，

if (mLayoutManager instanceof StaggeredGridLayoutManager) {
//因?yàn)镾taggeredGridLayoutManager的特殊性可能導(dǎo)致最后顯示的item存在多個(gè)，所以這里取到的是一個(gè)數(shù)組
//得到這個(gè)數(shù)組后再取到數(shù)組中position值最大的那個(gè)就是最后顯示的position值了
int[] lastPositions = new int[((StaggeredGridLayoutManager) mLayoutManager).getSpanCount()];
((StaggeredGridLayoutManager) mLayoutManager).findLastVisibleItemPositions(lastPositions);
mLastVisibleItem = findMax(lastPositions);
mFirstVisibleItem = ((StaggeredGridLayoutManager) mLayoutManager).findFirstVisibleItemPositions(lastPositions)[0];
setFootviewVisible();
}

因?yàn)镾taggeredGridLayoutManager的特殊性可能導(dǎo)致最后顯示的item存在多個(gè)，所以這里取到的是一個(gè)數(shù)組，得到這個(gè)數(shù)組后再取到數(shù)組中position值最大的那個(gè)就是最后顯示的position值了再去設(shè)置最后一行加載更多的顯示。

以上所述是小編給大家介紹的Android RecyclerView 上拉加載更多及下拉刷新功能的實(shí)現(xiàn)方法，希望對(duì)大家有所幫助，如果大家有任何疑問歡迎給我留言，小編會(huì)及時(shí)回復(fù)大家的，在此也非常感謝大家對(duì)腳本之家網(wǎng)址的支持！

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