android RecycleView实现下拉刷新和上拉加载

2023-07-22 16:00:07 69

android的下拉刷新，上拉加载功能，翻页时显示从第1页开始到当前页面的内容，并且当前显示的是当前页的内容；

1.PullRefreshRecyclerView.java:翻页控件

publicclassPullRefreshRecyclerViewextendsLinearLayoutimplementsSwipeRefreshLayout.OnRefreshListener,View.OnTouchListener{
privateSwipeRefreshLayoutswipeRefreshLayout;
privateRecyclerViewrecyclerView;
privateLinearLayoutfooterView;
privateOnPullRefreshListenerlistener;
//是否正在刷新
privatebooleanisRefreshing=false;
//是否正在加载
privatebooleanisLoading=false;

//是否有更多数据
privatebooleanhasMore=false;

publicPullRefreshRecyclerView(Contextcontext){
this(context,null);
}

publicPullRefreshRecyclerView(Contextcontext,AttributeSetattrs){
super(context,attrs);
initView(context);
initListener();
init();
}

privatevoidinitView(Contextcontext){
LayoutInflater.from(context).inflate(R.layout.pull_recycler_layout,this,true);
swipeRefreshLayout=findViewById(R.id.swipeRefreshLayout);
recyclerView=findViewById(R.id.recyclerView);
footerView=findViewById(R.id.footerView);

}

privatevoidinitListener(){
swipeRefreshLayout.setOnRefreshListener(this);
recyclerView.addOnScrollListener(newPullableScroll());
//防止滚动的时候，滑动View
recyclerView.setOnTouchListener(this);
}

privatevoidinit(){
swipeRefreshLayout.setColorSchemeResources(android.R.color.holo_green_dark,
android.R.color.holo_blue_dark,
android.R.color.holo_orange_dark);
//隐藏垂直滚动条
recyclerView.setVerticalScrollBarEnabled(true);
//item高度固定时，设置该选项提高性能
recyclerView.setHasFixedSize(true);
//设置item动画效果
recyclerView.setItemAnimator(newDefaultItemAnimator());
}

publicvoidsetHasFixedSize(booleanhasFixedSize){
recyclerView.setHasFixedSize(hasFixedSize);
}

publicvoidsetItemAnimator(RecyclerView.ItemAnimatoranimator){
recyclerView.setItemAnimator(animator);
}

publicvoidsetLayoutManager(RecyclerView.LayoutManagerlayout){
recyclerView.setLayoutManager(layout);
}

publicvoidsetVerticalScrollBarEnabled(booleanverticalScrollBarEnabled){
recyclerView.setVerticalScrollBarEnabled(verticalScrollBarEnabled);
}

publicvoidaddItemDecoration(RecyclerView.ItemDecorationdecor){
recyclerView.addItemDecoration(decor);

}

publicvoidsetAdapter(RecyclerView.Adapteradapter){
recyclerView.setAdapter(adapter);
}

/**
*设置监听下拉或上拉的事件
*
*@paramlistener
*/
publicvoidsetOnPullRefreshListener(OnPullRefreshListenerlistener){
this.listener=listener;
}

/**
*设置是否有更多数据
*
*@paramhasMore
*/
publicvoidsetHasMore(booleanhasMore){
this.hasMore=hasMore;
}

/**
*滚动到顶部
*/
publicvoidscrollToTop(){
recyclerView.scrollToPosition(0);
}

/**
*正在刷新
*/
@Override
publicvoidonRefresh(){
isRefreshing=true;
if(listener!=null){
listener.onRefresh();
}

}

/**
*设置是否允许下拉
*
*@paramenable
*/
publicvoidsetRefreshEnable(booleanenable){
swipeRefreshLayout.setEnabled(enable);
}

/**
*滚动时判断能否能刷新
*
*@return
*/
privatebooleanisRefreshEnable(){
return!isRefreshing&&!isLoading;
}

/**
*正在加载更多
*/
publicvoiddoLoadMore(){
if(!isLoading&&hasMore&&!isRefreshing){
footerView.setVisibility(View.VISIBLE);
isLoading=true;
//禁止下拉
setRefreshEnable(false);
if(listener!=null){
listener.onLoadMore();
}
}
}

/**
*刷新或加载完成
*/
publicvoidrefreshOrLoadComplete(){
isRefreshing=false;
swipeRefreshLayout.setRefreshing(false);
isLoading=false;
footerView.setVisibility(View.GONE);
//允许下拉
this.setEnabled(true);
}

@Override
publicbooleanonTouch(Viewv,MotionEventevent){
returnisRefreshing||isLoading;
}

publicinterfaceOnPullRefreshListener{
/**
*刷新操作
*/
voidonRefresh();

/**
*加载操作
*/
voidonLoadMore();
}

/**
*监听RecycleView滑动底部或顶部
*/
classPullableScrollextendsRecyclerView.OnScrollListener{
@Override
publicvoidonScrolled(RecyclerViewrecyclerView,intdx,intdy){
super.onScrolled(recyclerView,dx,dy);
intlastVisibleItem=0;
intfirstVisibleItem=0;
RecyclerView.LayoutManagerlayoutManager=recyclerView.getLayoutManager();
inttotalItemCount=layoutManager.getItemCount();
if(layoutManagerinstanceofLinearLayoutManager){
LinearLayoutManagerlinearLayoutManager=(LinearLayoutManager)layoutManager;
lastVisibleItem=linearLayoutManager.findLastVisibleItemPosition();
firstVisibleItem=linearLayoutManager.findFirstCompletelyVisibleItemPosition();
}elseif(layoutManagerinstanceofStaggeredGridLayoutManager){
StaggeredGridLayoutManagerstaggeredGridLayoutManager=(StaggeredGridLayoutManager)layoutManager;
//sincemayleadtothefinalitemhasmorethanoneStaggeredGridLayoutManagertheparticularityofthesoherethatisanarray
//thisarrayintoanarrayofpositionandthentakethemaximumvaluethatisthelastshowthepositionvalue
int[]lastPositions=newint[((StaggeredGridLayoutManager)layoutManager).getSpanCount()];
staggeredGridLayoutManager.findLastVisibleItemPositions(lastPositions);
lastVisibleItem=findMax(lastPositions);
firstVisibleItem=staggeredGridLayoutManager.findFirstVisibleItemPositions(lastPositions)[0];
}

pullRefreshEnable(firstVisibleItem,totalItemCount);
if(isSlideToBottom(recyclerView)){
loadMore(dx,dy,lastVisibleItem,totalItemCount);
}

}

privateintfindMax(int[]lastPositions){
intmax=lastPositions[0];
for(intvalue:lastPositions){
if(value>max){
max=value;
}
}
returnmax;
}
}

/**
*判断是否滑动到底部
*
*@paramrecyclerView
*@return
*/
publicbooleanisSlideToBottom(RecyclerViewrecyclerView){
if(recyclerView==null){
returnfalse;
}
if(recyclerView.computeVerticalScrollExtent()+recyclerView.computeVerticalScrollOffset()
>=recyclerView.computeVerticalScrollRange()){
returntrue;
}
returnfalse;
}

privatevoidloadMore(intdx,intdy,intlastVisibleItem,inttotalItemCount){
//滚动到底部时且有更多数据能够上拉加载
if(lastVisibleItem>=totalItemCount-1&&(dx>0||dy>0)){
doLoadMore();
}
}

privatevoidpullRefreshEnable(intfirstVisibleItem,inttotalItemCount){
//滚动到顶部时能够下拉刷新
if(firstVisibleItem==0||totalItemCount==0){
if(isRefreshEnable()){
//允许下拉
setRefreshEnable(true);
}
}else{
//禁止下拉
setRefreshEnable(false);
}
}

}

2.PunishListActivity.java:调用

@Route(path=Page.ACTIVITY_PUNISH_LIST)
publicclassPunishListActivityextendsBaseActivityimplementsView.OnClickListener,PullRefreshRecyclerView.OnPullRefreshListener{
privatestaticfinalStringTAG="PunishListActivity";
privateListpunishBeans=newArrayList<>();
privateContextmContext;
privateEditTextet_punish_searchName;
privateImageViewiv_search;
privatePullRefreshRecyclerViewprr_punish;
privateStringofficeName="";
privateintpageNo=1;
privatebooleanisLastPage=false;
privatePunishAdapterpunishAdapter;

@Override
publicvoidonBeforeSetContentView(){
StatusBarUtil.translucent(this,ContextCompat.getColor(this,R.color.color_0a5fb6));
}

@Override
publicintgetLayoutResID(){
returnR.layout.activity_punish_list;
}

@Override
protectedCharSequencesetActionBarTitle(){
return"行政处罚";
}
@Nullable
@Override
publicAppBarConfiggetAppBarConfig(){
returnmAppBarCompat;
}

@Override
publicintsetActionBarRightVisibility(){
returnView.VISIBLE;
}

@Override
publicCharSequencesetActionBarRightText(){
return"添加";
}

publicvoidonResume(){
super.onResume();
getPunishList("");
}

@Override
publicvoidinitContentView(@NullableBundlesavedInstanceState){
mContext=PunishListActivity.this;
et_punish_searchName=findViewById(R.id.et_punish_searchName);
iv_search=findViewById(R.id.iv_search);
iv_search.setOnClickListener(this);
prr_punish=findViewById(R.id.prr_punish);
prr_punish.setOnPullRefreshListener(this);
prr_punish.setHasMore(true);
}

@Override
publicvoidinitData(@NullableBundlesavedInstanceState){
punishAdapter=newPunishAdapter(mContext,punishBeans);
LinearLayoutManagermanager=newLinearLayoutManager(mContext);
manager.setOrientation(RecyclerView.VERTICAL);
prr_punish.setLayoutManager(manager);
prr_punish.setAdapter(punishAdapter);
//getPunishList();
}

privatevoidgetPunishList(StringofficeName){
HashMapbaseParam=WebFrontUtil.getBaseParam();
baseParam.put("pageNo",pageNo);
baseParam.put("pageSize",10);

baseParam.put("officeName",officeName);
OkHttpUtil.post(TAG,WebApi.PUNISH_LIST_URL,baseParam,newStringCallback(){
@Override
publicvoidonError(Callcall,Exceptione,intid){
hideWaitDialog();
Log.d(TAG,""+e);
}

@Override
publicvoidonResponse(Stringresponse,intid){
Log.d(TAG,"response==="+response);
try{
JSONObjectobject=newJSONObject(response);
hideWaitDialog();
if((int)object.get("code")==200){
JSONObjectobject1=object.getJSONObject("data");
PunishBeanListpunishBeanList=newGson().fromJson(object1.toString(),PunishBeanList.class);
Log.d(TAG,"response==="+punishBeanList.getList().size());
if(pageNo==1){
punishBeans.clear();
}
if(punishBeanList.getList()!=null&&punishBeanList.getList().size()!=0){
ListaddPunishs=newArrayList<>();
addPunishs=punishBeanList.getList();
if(punishBeans.size()>0){
punishBeans.addAll(addPunishs);
punishAdapter.addMoreData(addPunishs);
}else{
punishBeans=addPunishs;
punishAdapter.setData(addPunishs);
}

if(punishBeanList.isLastPage()){
isLastPage=true;
Log.e(TAG,"isLastPage=true");
}else{
isLastPage=false;
Log.e(TAG,"isLastPage=false");
}
}
}else{
Toast.makeText(mContext,object.get("message").toString(),Toast.LENGTH_SHORT).show();
}
}catch(JSONExceptione){
e.printStackTrace();
}
}
});
}

@Override
protectedvoidactionBarRightOnClick(){
ARouter.getInstance().build(Page.ACTIVITY_PUNISH_ADD).navigation();
}

@Override
publicvoidonClick(Viewview){
switch(view.getId()){
caseR.id.iv_search:
showWaitDialog();
officeName=et_punish_searchName.getText().toString();
pageNo=1;
isLastPage=false;
getPunishList(officeName);
break;
}
}

@Override
publicvoidonRefresh(){
prr_punish.refreshOrLoadComplete();
pageNo=1;
getPunishList(officeName);
prr_punish.setRefreshEnable(true);
}

@Override
publicvoidonLoadMore(){
Log.d(TAG,"onLoadMore===================");
prr_punish.refreshOrLoadComplete();
if(isLastPage){
prr_punish.setRefreshEnable(false);
}else{
pageNo+=1;
getPunishList(officeName);
}
}
}

3.PunishAdapter.java

publicclassPunishAdapterextendsRecyclerView.Adapter{
privateContextmContext;
privateListpunishList;

publicPunishAdapter(ContextmContext,ListpunishList){
this.mContext=mContext;
this.punishList=punishList;
}

@NonNull
@Override
publicRecyclerView.ViewHolderonCreateViewHolder(@NonNullViewGroupparent,intviewType){
Viewview=LayoutInflater.from(mContext).inflate(R.layout.punish_item,parent,false);
PunishHolderpunishHolder=newPunishHolder(view);
returnpunishHolder;
}

@Override
publicvoidonBindViewHolder(@NonNullRecyclerView.ViewHolderholder,intposition){
PunishBeanpunishBean=punishList.get(position);
PunishHolderpunishHolder=(PunishHolder)holder;
punishHolder.tv_punishName.setText(punishBean.getOfficeName());
punishHolder.tv_faren.setText(punishBean.getLegalPerson());
punishHolder.tv_punishMode.setText(punishBean.getPunishWay());
punishHolder.tv_punishReason.setText(punishBean.getReason());
punishHolder.tv_punishTime.setText(punishBean.getUpdateTime());
punishHolder.tv_punishDesc.setText(punishBean.getRemarks());
punishHolder.itemView.setOnClickListener(newView.OnClickListener(){
@Override
publicvoidonClick(Viewview){
Bundlebundle=newBundle();
bundle.putSerializable("punishDetail",punishBean);
ARouter.getInstance().build(Page.ACTIVITY_PUNISH_DETAIL).with(bundle).navigation();
}
});
}

/*
*向列表尾部添加数据
**/
publicvoidaddMoreData(Listlist){
intoldSize=punishList.size();
if(list!=null&&list.size()>0){
punishList.addAll(punishList.size(),list);
notifyItemRangeInserted(oldSize,list.size());
}
}

/*
*填充新数据
**/
publicvoidsetData(Listdata){
if(data!=null&&data.size()>0){
punishList.clear();
punishList.addAll(data);
notifyDataSetChanged();
}
}

@Override
publicintgetItemCount(){
returnpunishList==null?0:punishList.size();
}

classPunishHolderextendsRecyclerView.ViewHolder{
privateTextViewtv_punishName,tv_faren,tv_punishMode,tv_punishReason,tv_punishTime,tv_punishDesc;

publicPunishHolder(@NonNullViewitemView){
super(itemView);
tv_punishName=itemView.findViewById(R.id.tv_punishName);
tv_faren=itemView.findViewById(R.id.tv_faren);
tv_punishMode=itemView.findViewById(R.id.tv_punishMode);
tv_punishReason=itemView.findViewById(R.id.tv_punishReason);
tv_punishTime=itemView.findViewById(R.id.tv_punishTime);
tv_punishDesc=itemView.findViewById(R.id.tv_punishDesc);

}
}
}

4.布局文件：

本文已经被整理到《Android下拉刷新上拉加载效果》，欢迎大家学习研究。

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android RecycleView实现下拉刷新和上拉加载

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