详解分别用Kotlin和java写RecyclerView的示例
本文介绍了分别用Kotlin和java写RecyclerView的示例，分享给大家，具体如下：
java：跟一般的写法一样，增加了按钮响应
MainActivity：
publicclassMainActivityextendsAppCompatActivityimplementsRecyclerAdapter.OnItemClickListener{
privateRecyclerViewmRecyclerView;
privateRecyclerView.LayoutManagermLayoutManager;
privateRecyclerAdaptermRecyclerAdapter;
privateArrayListlist;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecyclerItemitem;
list=newArrayList<>();
item=newRecyclerItem();
item.setName("No."+0);
list.add(item);
mRecyclerView=findViewById(R.id.recyclerView);
mRecyclerAdapter=newRecyclerAdapter(this,list);
mRecyclerAdapter.setOnItemClickListener(this);
//竖直方向的网格样式，每行一个Item
mLayoutManager=newGridLayoutManager(this,3,OrientationHelper.VERTICAL,false);
//设置布局管理器
mRecyclerView.setLayoutManager(mLayoutManager);
//设置adapter
mRecyclerView.setAdapter(mRecyclerAdapter);
//设置Item添加和移除的动画
mRecyclerView.setItemAnimator(newDefaultItemAnimator());
}
//adapter的按钮点击事件
@Override
publicvoidonItemContentClick(Viewview,intposition){
//点击最后一个按钮增加一个item
if(position==list.size()-1){
RecyclerItemitem=newRecyclerItem();
item.setName("No."+(position+1));
list.add(0,item);
//更新RecyclerView
mRecyclerAdapter.updateData(list);
}else{
Toast.makeText(this,"No."+position,Toast.LENGTH_SHORT).show();
}
}
}
Adapter：
publicclassRecyclerAdapterextendsRecyclerView.Adapter{
privateArrayListmData;
privateContextmContext;
privateOnItemClickListeneronItemClickListener;
publicvoidsetOnItemClickListener(OnItemClickListenerlistener){
this.onItemClickListener=listener;
}
publicRecyclerAdapter(ContextmContext,ArrayListmData){
this.mData=mData;
this.mContext=mContext;
}
//刷新整个list
publicvoidupdateData(ArrayListdata){
this.mData=data;
notifyDataSetChanged();
}
//刷新局部list
publicvoidupdateDataItem(ArrayListdata,intitemnm){
this.mData=data;
notifyItemChanged(itemnm);
}
@Override
publicViewHolderonCreateViewHolder(ViewGroupparent,intviewType){
Viewv=LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_item,parent,false);
ViewHolderviewHolder=newViewHolder(v);
returnviewHolder;
}
@Override
publicvoidonBindViewHolder(finalViewHolderholder,intposition){
holder.btn.setText(mData.get(position).getName());
holder.btn.setOnClickListener(newView.OnClickListener(){
@Override
publicvoidonClick(Viewv){
if(onItemClickListener!=null){
intpos=holder.getLayoutPosition();
onItemClickListener.onItemContentClick(holder.itemView,pos);
}
}
});
}
@Override
publicintgetItemCount(){
returnmData==null?0:mData.size();
}
publicstaticclassViewHolderextendsRecyclerView.ViewHolder{
Buttonbtn;
publicViewHolder(ViewitemView){
super(itemView);
btn=itemView.findViewById(R.id.recycle_name);
}
}
publicinterfaceOnItemClickListener{
voidonItemContentClick(Viewview,intposition);
}
}
RecyclerItem:
publicclassRecyclerItem{
Stringname;
publicStringgetName(){
returnname;
}
publicvoidsetName(Stringname){
this.name=name;
}
activity_main:
recycler_item:
Kotlin:语法略有不同，recyclerview调用类似
MainActivity：
classMainActivity:AppCompatActivity(),MainAdapter.ItemClick{
valitems:MutableList=ArrayList()
varmainAdapter:MainAdapter?=null
overridefunonCreate(savedInstanceState:Bundle?){
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
//添加一个item
varitem:RecyclerItem
item=RecyclerItem()
item.name="No."+0
items.add(item)
valrecyclerView=findViewById(R.id.recyclerView)asRecyclerView
recyclerView.layoutManager=GridLayoutManager(this,3,OrientationHelper.VERTICAL,false)
mainAdapter=MainAdapter(items,this)
mainAdapter!!.setItemClickListener(this)
recyclerView.adapter=mainAdapter
recyclerView.itemAnimator=DefaultItemAnimator()
}
//adapter的按钮点击事件
overridefunOnItemClick(v:View,position:Int){
if(position==items.size-1){
valitem=RecyclerItem()
item.name="No."+(position+1)
items.add(0,item)
//更新数据
mainAdapter!!.updateData(items)
}else{
Toast.makeText(this,items.get(position).name,Toast.LENGTH_SHORT).show()
}
}
}
MainAdapter：
classMainAdapter:RecyclerView.Adapter{
varitems:List?=null
varcontext:Context?=null
varitemClick:ItemClick?=null
constructor(items:List,context:Context){
this.items=items
this.context=context
}
funsetItemClickListener(itemClick:ItemClick){
this.itemClick=itemClick
}
funupdateData(items:List){
this.items=items
notifyDataSetChanged()
}
overridefunonBindViewHolder(holder:ViewHolder?,position:Int){
varname=items!!.get(position).name
if(holder!=null){
holder.textName.setText(name)
holder.textName.setOnClickListener(View.OnClickListener{
if(itemClick!=null){
itemClick!!.OnItemClick(holder.itemView,position)
}
})
}
}
overridefungetItemCount():Int{
returnitems!!.size
}
overridefunonCreateViewHolder(parent:ViewGroup?,viewType:Int):ViewHolder{
valv=LayoutInflater.from(parent!!.context).inflate(R.layout.recycler_item,parent,false)asRelativeLayout
valholder=ViewHolder(v)
returnholder
}
classViewHolder(itemView:View?):RecyclerView.ViewHolder(itemView){
vartextName:TextView=itemView!!.findViewById(R.id.recycle_name)asTextView
}
interfaceItemClick{
funOnItemClick(v:View,position:Int);
}
}
RecyclerItem：
classRecyclerItem{
varname:String=""
get
set
}
activity_main:
recycler_item:
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="100dp" android:layout_height="100dp">
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。