This article introduces an example of writing RecyclerView using Kotlin and Java respectively. It is shared with you. The details are as follows:
java: Just like the general writing method, button response has been added
MainActivity:
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); // Vertical grid style, one Item per line mLayoutManager=new GridLayoutManager(this,3,OrientationHelper.VERTICAL,false); // Set layout manager mRecyclerView.setLayoutManager(mLayoutManager); // Set adapter mRecyclerView.setAdapter(mRecyclerAdapter); // Set the animation for Item addition and removal mRecyclerView.setItemAnimator(newDefaultItemAnimator()); } // Adapter's button click event @Override public void onItemContentClick(Viewview,intposition) { // Click the last button to add an item if(position == list.size()-1) { RecyclerItemitem=newRecyclerItem(); item.setName("No."+(position+1)); list.add(0,item); //Update RecyclerView mRecyclerAdapter.updateData(list); }else{ Toast.makeText(this,"No."+position,Toast.LENGTH_SHORT).show(); } }}Adapter:
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; } //Refresh the entire list public void updateData(ArrayList data) { this.mData = data; notifyDataSetChanged(); } //Refresh local 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:
public class RecyclerItem{ String name; public String getName() { return name; } public void setName(String name) { this.name = name; }activity_main:
<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:
<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: The syntax is slightly different, the recyclerview call is similar
MainActivity:
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) //Add an 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's button click event override fun OnItemClick(v: View, position : Int) { if(position == items.size - 1) { val item = RecyclerItem() item.name = "No." + (position + 1) items.add(0, item) //Update data mainAdapter!!.updateData(items) }else{ Toast.makeText(this,items.get(position).name, Toast.LENGTH_SHORT).show() } }}MainAdapter:
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:
class RecyclerItem{ var name : String = "" get set}activity_main:
<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:
<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>
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