#12 안드로이드 스튜디오 리사이클러뷰 (Recycler View) 예제 [ 홍드로이드 ]

[build.gradle (Module: app)]

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.example.recyclerviewexample"
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.android.support:recyclerview-v7:27.1.1'
}

[activity_main.xml]

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    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"
    android:orientation="vertical"
    tools:context=".MainActivity">
 
    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:scrollbarFadeDuration="0"
        android:scrollbarSize="5dp"
        android:scrollbarThumbVertical="@android:color/darker_gray"
        android:scrollbars="vertical">
    </android.support.v7.widget.RecyclerView>
 
 
    <Button
        android:id="@+id/btn_add"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="8"
        android:text="추가" />
 
 
</LinearLayout>

[item_list.xml]

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
 
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
 
        <ImageView
            android:id="@+id/iv_profile"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@mipmap/ic_launcher" />
 
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center_vertical"
            android:orientation="vertical">
 
            <TextView
                android:id="@+id/tv_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="홍드로이드" />
 
            <TextView
                android:id="@+id/tv_content"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="리사이클러뷰" />
 
 
        </LinearLayout>
 
 
    </LinearLayout>
 
</LinearLayout>

[MainData.java]

package com.example.recyclerviewexample;
 
public class MainData {
 
    private int iv_profile;
    private String tv_name;
    private String tv_content;
 
 
    public MainData(int iv_profile, String tv_name, String tv_content) {
        this.iv_profile = iv_profile;
        this.tv_name = tv_name;
        this.tv_content = tv_content;
    }
 
 
    public int getIv_profile() {
        return iv_profile;
    }
 
    public void setIv_profile(int iv_profile) {
        this.iv_profile = iv_profile;
    }
 
    public String getTv_name() {
        return tv_name;
    }
 
    public void setTv_name(String tv_name) {
        this.tv_name = tv_name;
    }
 
    public String getTv_content() {
        return tv_content;
    }
 
    public void setTv_content(String tv_content) {
        this.tv_content = tv_content;
    }
}
 

[MainAdapter.java]

package com.example.recyclerviewexample;
 
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
 
import java.util.ArrayList;
 
public class MainAdapter extends RecyclerView.Adapter<MainAdapter.CustomViewHolder> {
 
    private ArrayList<MainData> arrayList;
 
    public MainAdapter(ArrayList<MainData> arrayList) {
        this.arrayList = arrayList;
    }
 
    @NonNull
    @Override
    public MainAdapter.CustomViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
 
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_list, parent, false);
        CustomViewHolder holder = new CustomViewHolder(view);
 
 
        return holder;
    }
 
    @Override
    public void onBindViewHolder(@NonNull final MainAdapter.CustomViewHolder holder, int position) {
        holder.iv_profile.setImageResource(arrayList.get(position).getIv_profile());
        holder.tv_name.setText(arrayList.get(position).getTv_name());
        holder.tv_content.setText(arrayList.get(position).getTv_content());
 
        holder.itemView.setTag(position);
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String curName = holder.tv_name.getText().toString();
                Toast.makeText(v.getContext(), curName, Toast.LENGTH_SHORT).show();
            }
        });
 
        holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                remove(holder.getAdapterPosition());
                return true;
            }
        });
 
    }
 
    @Override
    public int getItemCount() {
        return (null != arrayList ? arrayList.size() : 0);
    }
 
    public void remove(int position) {
        try {
            arrayList.remove(position);
            notifyItemRemoved(position);
        } catch (IndexOutOfBoundsException ex) {
            ex.printStackTrace();
        }
    }
 
    public class CustomViewHolder extends RecyclerView.ViewHolder {
 
        protected ImageView iv_profile;
        protected TextView tv_name;
        protected TextView tv_content;
 
        public CustomViewHolder(View itemView) {
            super(itemView);
            this.iv_profile = (ImageView) itemView.findViewById(R.id.iv_profile);
            this.tv_name = (TextView) itemView.findViewById(R.id.tv_name);
            this.tv_content = (TextView) itemView.findViewById(R.id.tv_content);
        }
    }
}
 

[MainActivity.java]

package com.example.recyclerviewexample;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Button;
 
import java.util.ArrayList;
 
public class MainActivity extends AppCompatActivity {
 
    private ArrayList<MainData> arrayList;
    private MainAdapter mainAdapter;
    private RecyclerView recyclerView;
    private LinearLayoutManager linearLayoutManager;
 
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        recyclerView = (RecyclerView) findViewById(R.id.rv);
        linearLayoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(linearLayoutManager);
        arrayList = new ArrayList<>();
        mainAdapter = new MainAdapter(arrayList);
        recyclerView.setAdapter(mainAdapter);
        
        Button btn_add = (Button) findViewById(R.id.btn_add);
        btn_add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                MainData mainData = new MainData(R.mipmap.ic_launcher, "홍드로이드", "리사이클러뷰");
                arrayList.add(mainData);
                mainAdapter.notifyDataSetChanged();
            }
        });
    }
}