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详解分别用Kotlin和java写RecyclerView的示例

转载 作者：qq735679552 更新时间：2022-09-27 22:32:09 25 4
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这篇CFSDN的博客文章详解分别用Kotlin和java写RecyclerView的示例由作者收集整理，如果你对这篇文章有兴趣，记得点赞哟.

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:

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public class MainActivity extends AppCompatActivity implements RecyclerAdapter.OnItemClickListener{
     private RecyclerView mRecyclerView;
     private RecyclerView.LayoutManager mLayoutManager;
     private RecyclerAdapter mRecyclerAdapter;
     private ArrayListlist;
 
     @Override
     protected void onCreate(Bundlesaved InstanceState) {
         super .onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         RecyclerItem item;
         list = new ArrayList<>();
         item = new RecyclerItem();
         item.setName( "No." + 0 );
         list.add(item);
         mRecyclerView = findViewById(R.id.recyclerView);
         mRecyclerAdapter = new RecyclerAdapter( this ,list);
         mRecyclerAdapter.setOnItemClickListener( this );
         // 竖直方向的网格样式，每行一个Item
         mLayoutManager= new GridLayoutManager( 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
     public void onItemContentClick(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:

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public class RecyclerAdapter extends RecyclerView.Adapter{
   private ArrayList mData;
   private Context mContext;
   private OnItemClickListener onItemClickListener;
   public void setOnItemClickListener(OnItemClickListener listener) {
     this .onItemClickListener = listener;
   }
   public RecyclerAdapter(Context mContext,ArrayList mData){
     this .mData = mData;
     this .mContext = mContext;
   }
 
   //刷新整个list
   public void updateData(ArrayList data) {
     this .mData = data;
     notifyDataSetChanged();
   }
 
   //刷新局部list
   public void updateDataItem(ArrayList data, int itemnm) {
     this .mData = data;
     notifyItemChanged(itemnm);
   }
 
   @Override
   public View Holder onCreateViewHolder(ViewGroup parent, int viewType) {
     View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_item, parent, false );
     ViewHolder viewHolder = new ViewHolder(v);
     return viewHolder;
   }
 
   @Override
   public void onBindViewHolder( final ViewHolder holder, int position) {
     holder.btn.setText(mData.get(position).getName());
     holder.btn.setOnClickListener(newView.OnClickListener() {
       @Override
       public void onClick(View v) {
         if (onItemClickListener != null ) {
           int pos = holder.getLayoutPosition();
           onItemClickListener.onItemContentClick(holder.itemView, pos);
         }
       }
     });
   }
 
   @Override
   public int getItemCount() {
     return mData == null ? 0 : mData.size();
   }
 
   public static class ViewHolder extends RecyclerView.ViewHolder{
     Button btn;
     public ViewHolder(View itemView) {
       super (itemView);
       btn = itemView.findViewById(R.id.recycle_name);
     }
   }
 
   public interface OnItemClickListener{
     void onItemContentClick(View view, int position);
   }
}

RecyclerItem

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public class RecyclerItem{
   String name;
   public String getName() {
     return name;
   }
   public void setName(String name) {
     this .name = name;
   }

activity_main

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< android.support.v7.widget.RecyclerView
   xmlns:app = "http://schemas.android.com/apk/res-auto"
   xmlns:tools = "http://schemas.android.com/tools"
   android:layout_width = "match_parent"
   android:layout_height = "match_parent"
   tools:context = "com.tudou.recycleviewdemo.MainActivity" >
 
   < android.support.v7.widget.RecyclerView
     android:id = "@+id/recyclerView"
     android:layout_width = "match_parent"
     android:layout_height = "match_parent"
     android:background = "#00000000"
     android:paddingBottom = "5dip" >
   </ android.support.v7.widget.RecyclerView >
</ android.support.constraint.ConstraintLayout >

recycler_item

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< RelativeLayout
   xmlns:android = "http://schemas.android.com/apk/res/android"
   android:layout_width = "100dp"
   android:layout_height = "100dp" >
   < Button
     android:id = "@+id/recycle_name"
     android:layout_width = "wrap_content"
     android:layout_height = "wrap_content"
     android:layout_centerInParent = "true"
     android:text = "No.1" />
</ RelativeLayout >

Kotlin:语法略有不同，recyclerview调用类似 。

MainActivity:

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class MainActivity : AppCompatActivity(), MainAdapter.ItemClick{
   val items : MutableList = ArrayList()
   var mainAdapter : MainAdapter ?= null
   override fun onCreate(savedInstanceState:Bundle?) {
     super .onCreate(savedInstanceState)
     setContentView(R.layout.activity_main)
     //添加一个item
     var item : RecyclerItem
     item = RecyclerItem()
     item.name = "No." + 0
     items.add(item)
     val recyclerView = findViewById(R.id.recyclerView) as RecyclerView
     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
   override fun OnItemClick(v : View, position : Int) {
     if (position == items.size - 1 ) {
       val item = 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:

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class MainAdapter : RecyclerView.Adapter{
   var items : List? = null
   var context : Context ?= null
   var itemClick : ItemClick ?= null
   constructor(items : List, context : Context){
     this .items = items
     this .context = context
   }
   fun setItemClickListener(itemClick : ItemClick){
     this .itemClick = itemClick
   }
   fun updateData(items : List){
     this .items = items
     notifyDataSetChanged()
   }
   override fun onBindViewHolder(holder : ViewHolder?, position : Int) {
     var name=items!!.get(position).name
     if (holder != null ) {
       holder.textName.setText(name)
       holder.textName.setOnClickListener(View.OnClickListener{
         if (itemClick != null ) {
           itemClick!!.OnItemClick(holder.itemView, position)
         }
       })
     }
   }
   override fun getItemCount():Int{
     return items!!.size
   }
   override fun onCreateViewHolder(parent : ViewGroup?, viewType : Int) : ViewHolder{
     val v = LayoutInflater.from(parent!!.context).inflate(R.layout.recycler_item, parent, false ) as RelativeLayout
     val holder = ViewHolder(v)
     return holder
   }
 
   class ViewHolder(itemView : View?) : RecyclerView.ViewHolder(itemView) {
     var textName : TextView = itemView!!.findViewById(R.id.recycle_name) as TextView
   }
 
   interface ItemClick{
     fun OnItemClick(v : View, position : Int);
   }
}

RecyclerItem:

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class RecyclerItem{
   var name : String = ""
     get
     set
}

activity_main

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< android.support.constraint.ConstraintLayout
   xmlns:app = "http://schemas.android.com/apk/res-auto"
   xmlns:tools = "http://schemas.android.com/tools"
   android:layout_width = "match_parent"
   android:layout_height = "match_parent"
   tools:context = "com.tudo.kotlintdemo.MainActivity" >
   < android.support.v7.widget.RecyclerView
     android:id = "@+id/recyclerView"
     android:layout_width = "match_parent"
     android:layout_height = "match_parent"
     android:background = "#00000000"
     android:paddingBottom = "5dip" >
   </ android.support.v7.widget.RecyclerView >
</ android.support.constraint.ConstraintLayout >

recycler_item

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< RelativeLayout >
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="100dp"
   android:layout_height="100dp">
   < Button
     android:id = "@+id/recycle_name"
     android:layout_width = "wrap_content"
     android:layout_height = "wrap_content"
     android:layout_centerInParent = "true"
     android:text = "No.1" />
</ RelativeLayout >

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我.

原文链接：https://www.jianshu.com/p/a255bd3d5da6 。

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