[Java] RecyclerView + ItemClickListener + ItemLongClickListener

RecyclerView  +  ItemClickListener  +  ItemLongClickListener

---

 

build.gradle (Module: app)

dependencies {
    // RecyclerView
    implementation 'androidx.recyclerview:recyclerview:1.1.0'
    // CardView
    implementation 'androidx.cardview:cardview:1.0.0'
}

 

 

 

 

 

 

 

cardview_item.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:layout_margin="10dp"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical"
        android:background="#BBBBBB"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent">

        <TextView
            android:text="혀가 길지 않은 개발자"
            android:textSize="26dp"
            android:textStyle="bold|italic"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />


        <TextView
            android:id="@+id/tvPosition"
            android:text="1"
            android:textSize="22dp"
            android:textStyle="bold|italic"
            android:layout_marginTop="5dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

cardview_item.xml

 

 

 

 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:listitem="@layout/cardview_item" />

</LinearLayout>

activity_main.xml

 

 

 

 

 

MyAdapter.java

package com.jwsoft.javaproject;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;
import java.util.List;

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

    List<Integer> mData;

    public interface ItemClickInterface {
        void onClick(View view, int position);
    }
    public interface ItemLongClickInterface {
        void onLongClick(View view, int position);
    }

    public ItemClickInterface itemClickInterface;
    public ItemLongClickInterface itemLongClickInterface;

    public MyAdapter(ArrayList<Integer> data,
                     ItemClickInterface clickInterface,
                     ItemLongClickInterface longClickInterface
    ) {
        this.mData = data;
        this.itemClickInterface = clickInterface;
        this.itemLongClickInterface = longClickInterface;
    }

    class MyViewHolder extends RecyclerView.ViewHolder {
        TextView tvPosition;
        View itemView;

        public MyViewHolder(View itemView) {
            super(itemView);
            this.itemView = itemView;
            tvPosition = itemView.findViewById(R.id.tvPosition);
        }

        public void bind(final int position) {
            tvPosition.setText(Integer.toString(position));
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    itemClickInterface.onClick(itemView, position);
                }
            });
            itemView.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    itemLongClickInterface.onLongClick(itemView, position);
                    return true;
                }
            });
        }
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        Context context = parent.getContext();
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.cardview_item, parent, false);

        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        holder.bind(position);
    }

    @Override
    public int getItemCount() {
        return mData.size();
    }
}

 

 

 

 

 

 

 

MainActivity.java

package com.jwsoft.javaproject;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        recyclerView = findViewById(R.id.recyclerView);

        MyAdapter.ItemClickInterface itemClickInterface = new MyAdapter.ItemClickInterface() {
            @Override
            public void onClick(View view, int position) {
                Toast.makeText(getApplicationContext(), "Short Click " + position, Toast.LENGTH_SHORT).show();
            }
        };

        MyAdapter.ItemLongClickInterface itemLongClickInterface = new MyAdapter.ItemLongClickInterface() {
            @Override
            public void onLongClick(View view, int position) {
                Toast.makeText(getApplicationContext(), "Long Click " + position, Toast.LENGTH_SHORT).show();
            }
        };

        ArrayList<Integer> data = new ArrayList<>();
        for (int i=0; i<10; i++) {
            data.add(i);
        }

        MyAdapter adapter = new MyAdapter(data, itemClickInterface, itemLongClickInterface);
        recyclerView.setHasFixedSize(true);
        recyclerView.setAdapter(adapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(this, RecyclerView.VERTICAL, false));

    }
}

실행 결과