리사이클러뷰-full

build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.3"

    defaultConfig {
        applicationId "com.example.recyclerviewex2"
        minSdkVersion 23
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    implementation 'androidx.recyclerview:recyclerview:1.1.0'

}

activity_main.xml

 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:background="#F0F0F0"
        >

    </androidx.recyclerview.widget.RecyclerView>

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button" />
</LinearLayout>

list_item.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="8dp"
    android:gravity="center_vertical"
    android:layout_marginBottom="8dp"
    android:background="@android:color/white">

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical"
        android:gravity="center_vertical">

        <TextView
            android:id="@+id/title_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:includeFontPadding="false"
            android:text="TITLE"
            android:textSize="18sp"
            android:textColor="@android:color/black"
            android:textStyle="bold"/>

        <TextView
            android:id="@+id/contents_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:includeFontPadding="false"
            android:text="content"
            android:textSize="13sp"
            android:textColor="@android:color/darker_gray"/>
    </LinearLayout>

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:scaleType="centerCrop"
        app:srcCompat="@mipmap/ic_launcher"/>
</LinearLayout>

ItemData.java

package com.example.recyclerviewex2;

public class ItemData {
    int image;
    String title;
    String contents;

    public ItemData(int image, String title, String contents) {
        this.image = image;
        this.title = title;
        this.contents = contents;
    }

    public int getImage() {
        return image;
    }

    public void setImage(int image) {
        this.image = image;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getContents() {
        return contents;
    }

    public void setContents(String contents) {
        this.contents = contents;
    }
}

MyRecyclerAdapter.java

package com.example.recyclerviewex2;

import android.graphics.drawable.GradientDrawable;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.OvalShape;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

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

import java.util.ArrayList;

public class MyRecyclerAdapter  extends  RecyclerView.Adapter<MyRecyclerAdapter.ViewHolder>{

    private ArrayList<ItemData> itemData;

    public interface MyRecyclerViewClickListener{
        void onItemClicked(int position);
        void onImageViewClicked(int position);
    }
    private MyRecyclerViewClickListener mListener;
    public void setOnClickListener(MyRecyclerViewClickListener listener){
        this.mListener = listener;
    }

    public MyRecyclerAdapter(ArrayList<ItemData> itemData) {
        this.itemData = itemData;
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        TextView title;
        TextView contents;
        ImageView imageView;
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            title = itemView.findViewById(R.id.title_text);
            contents = itemView.findViewById(R.id.contents_text);
            imageView = itemView.findViewById(R.id.imageView);
            imageView.setBackground(new ShapeDrawable(new OvalShape()));
            imageView.setClipToOutline(true);

        }
    }

    @NonNull
    @Override
    public MyRecyclerAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.list_item, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyRecyclerAdapter.ViewHolder holder, int position) {
        ItemData item = itemData.get(position);
        holder.title.setText(item.getTitle());
        holder.contents.setText(item.getContents());
        holder.imageView.setImageResource(item.getImage());

        if(mListener != null){
            final  int pos = position;
            holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    mListener.onItemClicked(pos);
                }
            });
            holder.imageView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    mListener.onImageViewClicked(pos);
                }
            });
        }

    }

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

}

MainActivity.java

public class MainActivity extends AppCompatActivity implements MyRecyclerAdapter.MyRecyclerViewClickListener {

    private int[] cat;
    private String[] catName;
    private ArrayList<ItemData> dataList = new ArrayList<>();

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

        RecyclerView recyclerView = findViewById(R.id.recyclerView);
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);

        cat = new int[]{R.drawable.pic_001, R.drawable.pic_002,R.drawable.pic_003,R.drawable.pic_004,R.drawable.pic_005,
                R.drawable.pic_006,R.drawable.pic_007,R.drawable.pic_008,R.drawable.pic_009,R.drawable.pic_010};
        catName = new String[]{"R.drawable.pic_001", "R.drawable.pic_002","R.drawable.pic_003",
                "R.drawable.pic_004","R.drawable.pic_005", "R.drawable.pic_006",
                "R.drawable.pic_007","R.drawable.pic_008","R.drawable.pic_009","R.drawable.pic_010"};

        final MyRecyclerAdapter adapter = new MyRecyclerAdapter(dataList);
        recyclerView.setAdapter(adapter);

        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            int i=0;
            @Override
            public void onClick(View v) {
                dataList.add(new ItemData(cat[i],"고양이 "+i,String.format("고양이리뷰 %03d",i)));
                adapter.notifyDataSetChanged();
                i++;
            }
        });
        adapter.setOnClickListener(this);
    }

    @Override
    public void onItemClicked(int position) {
        Toast.makeText(getApplicationContext(),""+position,Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onImageViewClicked(int position) {
        Toast.makeText(getApplicationContext(),""+catName[position],Toast.LENGTH_SHORT).show();
    }
}