RecyclerView 기본 사용법 정리본

요런거 만들꺼임

RecyclerView 만들때 필요한것

-java

MainActivity.java (RecyclerView가 들어가는 부분)

TestItem.java

TestViewHolder.java

TestAdapter.java

-xml

activity_main.xml (RecyclerView가 들어가는 부분)

item_test.xml

-build.gradle(Module:app)

implementation 'com.android.support:recyclerview-v7:28.0.0'

( v7:28.0.0 버전 부분은 알아서 본인 버전에 맞게...)

(최신버전은 https://developer.android.com/guide/topics/ui/layout/recyclerview 여기로...)

-더미데이터(json형식)

[{"name":"마리오", "age":42, "gender":"남", "job":"배관공"},{"name":"피카츄", "age":5, "gender":"여", "job":"발전기"},{"name":"루이지", "age":38, "gender":"남", "job":"배관공"},{"name":"찌리리공", "age":1, "gender":"남", "job":"배터리"},{"name":"네이버", "age":20, "gender":"남", "job":"초록색"},{"name":"다음", "age":22, "gender":"남", "job":"파랑색"},{"name":"카카오", "age":5, "gender":"여", "job":"노란색"},{"name":"구글", "age":30, "gender":"남", "job":"빨노초파"},{"name":"야후", "age":42, "gender":"여", "job":"빨간색"},{"name":"라이코스", "age":15, "gender":"여", "job":"멍멍이"},{"name":"네이트", "age":38, "gender":"여", "job":"주작"}]

---

MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

import com.google.gson.Gson;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private RecyclerView rv_main;
    private String tempData =
                            "[" +
                                "{\"name\":\"마리오\", \"age\":42, \"gender\":\"남\", \"job\":\"배관공\"}," +
                                "{\"name\":\"피카츄\", \"age\":5, \"gender\":\"여\", \"job\":\"발전기\"}," +
                                "{\"name\":\"루이지\", \"age\":38, \"gender\":\"남\", \"job\":\"배관공\"}," +
                                "{\"name\":\"찌리리공\", \"age\":1, \"gender\":\"남\", \"job\":\"배터리\"}," +
                                "{\"name\":\"네이버\", \"age\":20, \"gender\":\"남\", \"job\":\"초록색\"}," +
                                "{\"name\":\"다음\", \"age\":22, \"gender\":\"남\", \"job\":\"파랑색\"}," +
                                "{\"name\":\"카카오\", \"age\":5, \"gender\":\"여\", \"job\":\"노란색\"}," +
                                "{\"name\":\"구글\", \"age\":30, \"gender\":\"남\", \"job\":\"빨노초파\"}," +
                                "{\"name\":\"야후\", \"age\":42, \"gender\":\"여\", \"job\":\"빨간색\"}," +
                                "{\"name\":\"라이코스\", \"age\":15, \"gender\":\"여\", \"job\":\"멍멍이\"}," +
                                "{\"name\":\"네이트\", \"age\":28, \"gender\":\"여\", \"job\":\"주작\"}" +
                            "]";

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

        init();
        setData();
    }

    private void init() {
        rv_main = findViewById(R.id.rv_main);
    }

    private void setData() {
        Gson gson = new Gson();
        ArrayList<TestItem> itemList = new ArrayList<>();

        TestItem[] items = gson.fromJson(tempData, TestItem[].class);

        for(TestItem item : items) {
            itemList.add(item);
        }

        TestAdapter adapter = new TestAdapter(getApplicationContext(), itemList);
        rv_main.setLayoutManager(new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.VERTICAL, false));
        rv_main.setAdapter(adapter);
    }
}

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_main"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

---

TestItem.java

public class TestItem {

    String name;
    int age;
    String gender;
    String job;

    public TestItem(String name, int age, String gender, String job) {
        this.name = name;
        this.age = age;
        this.gender = gender;
        this.job = job;
    }


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getJob() {
        return job;
    }

    public void setJob(String job) {
        this.job = job;
    }
}

item_test.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="match_parent"
    android:orientation="horizontal">


    <TextView
        android:id="@+id/tv_name"
        android:gravity="center"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:text="name"/>


    <TextView
        android:id="@+id/tv_age"
        android:gravity="center"
        android:layout_width="50dp"
        android:layout_height="wrap_content"
        android:text="age"/>


    <TextView
        android:id="@+id/tv_gender"
        android:gravity="center"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:text="gender"/>


    <TextView
        android:id="@+id/tv_job"
        android:gravity="center"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:text="job"/>


</LinearLayout>

---

TestViewHolder.java

import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;

public class TestViewHolder extends RecyclerView.ViewHolder {

    public TextView tv_name, tv_age, tv_gender, tv_job;
    public TestViewHolder(@NonNull View itemView) {
        super(itemView);

        tv_name = itemView.findViewById(R.id.tv_name);
        tv_age = itemView.findViewById(R.id.tv_age);
        tv_gender = itemView.findViewById(R.id.tv_gender);
        tv_job = itemView.findViewById(R.id.tv_job);
    }
}

---

TestAdapter.java

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;

import java.util.ArrayList;

public class TestAdapter extends RecyclerView.Adapter<TestViewHolder> {

    private Context mContext;
    private ArrayList<TestItem> itemList;

    public TestAdapter(Context mContext, ArrayList<TestItem> itemList) {
        this.mContext = mContext;
        this.itemList = itemList;
    }

    @NonNull
    @Override
    public TestViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View baseView = View.inflate(mContext, R.layout.item_test,null);
        TestViewHolder testViewHolder = new TestViewHolder(baseView);
        return testViewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull TestViewHolder testViewHolder, int position) {

        TestItem item = itemList.get(position);

        testViewHolder.tv_name.setText(item.getName());
        testViewHolder.tv_age.setText(item.getAge()+"");
        testViewHolder.tv_gender.setText(item.getGender());
        testViewHolder.tv_job.setText(item.getJob());
    }

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

---

build.gradle(Module:app)

dependencies {

    .
    .
    .


    implementation 'com.android.support:recyclerview-v7:28.0.0'
    implementation 'com.google.code.gson:gson:2.8.5'
}

---

전체코드가 없으니 헷깔리는거 같아서 다시 작성...