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관리 메뉴

웹개발자의 기지개

[안드로이드] RecyclerView 실전예제1 - json 내용을 읽어오기 본문

안드로이드

[안드로이드] RecyclerView 실전예제1 - json 내용을 읽어오기

http://portfolio.wonpaper.net 2020. 4. 16. 02:52

위의 json 리스트내역 내용을 ReRecyclerView 를 이용하여 아래의 결과 화면 처럼 안드로이드 화면으로 만들어 보자.

최종 결과물

우선 json 형태로 리스트 내용을 뽑아오자. 

필자는 php 를 이용하여 임의의 json2.php 파일을 아래와 같이 만들어 보았다.

이러한 php 파일로 json 형태의 리스트를 만드는 방법에 관하여 별도의 포스팅 글을 만들어 두었다.

꼭 참고하도록 하자. ( https://wonpaper.tistory.com/213 )

 

[ json2.php ]

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<?
header("Content-Type:application/json");
// DB연결설정파일
include "../inc/config.php";
 
 
$query = "select * from book_list order by a.goods_no desc limit 20";
$res   = mysql_query($query) or die("selecting error!");
if ($res) {
 
    $arr2 = array();
 
        $arr = array();
        while ($row = mysql_fetch_object($res)) {
            
            $t = new stdClass();
            $t->goods_no = $row->goods_no;
            $t->goods_name = $row->goods_name;
            $t->sell_price = $row->sell_price;
            $t->goods_writer = $row->goods_writer;
            $t->goods_detail1 = $row->goods_detail1;
            $t->goods_pic1 = $row->goods_pic1;
 
            $arr[] = $t;
            unset($t);
        }
 
    $arr2['book'] = $arr;
 
} else {
    $arr2 = array(0 => 'empty');
}
 
 
echo json_encode($arr2,JSON_PRETTY_PRINT+JSON_UNESCAPED_UNICODE);
?>
 cs

위의 소스를 만들었으면 http://각자도메인/json2.php 으로 확인해 보자.

 

[ Book.java ]

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public class Book implements Serializable {
    public int goods_no;
    public String goods_name;
    public int sell_price;
    public String goods_writer;
    public String goods_detail1;
    public String goods_detail2;
    public String goods_detail3;
    public String goods_pic1;
 
    public String goods_pan;
 
 
    public Book() { }
 
    public int getGoods_no() {
        return goods_no;
    }
 
    public void setGoods_no(int goods_no) {
        this.goods_no = goods_no;
    }
 
    public String getGoods_name() {
        return goods_name;
    }
 
    public void setGoods_name(String goods_name) {
        this.goods_name = goods_name;
    }
 
    public int getSell_price() {
        return sell_price;
    }
 
    public void setSell_price(int sell_price) {
        this.sell_price = sell_price;
    }
 
    public String getGoods_writer() {
        return goods_writer;
    }
 
    public void setGoods_writer(String goods_writer) {
        this.goods_writer = goods_writer;
    }
 
    public String getGoods_detail1() {
        return goods_detail1;
    }
 
    public void setGoods_detail1(String goods_detail1) {
        this.goods_detail1 = goods_detail1;
    }
 
    public String getGoods_detail2() {
        return goods_detail2;
    }
 
    public void setGoods_detail2(String goods_detail2) {
        this.goods_detail2 = goods_detail2;
    }
 
    public String getGoods_detail3() {
        return goods_detail3;
    }
 
    public void setGoods_detail3(String goods_detail3) {
        this.goods_detail3 = goods_detail3;
    }
 
    public String getGoods_pic1() { return goods_pic1;}
 
    public void setGoods_pic1(String goods_pic1) {this.goods_pic1 = goods_pic1;}
}
 cs

[ activity_book_list01.xml ] - 기본 xml 레이아웃

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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".BookList01Activity">
 
    <TextView
        android:id="@+id/tv1"
        android:text="도서목록"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
 
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tv1" />
 
</androidx.constraintlayout.widget.ConstraintLayout>
 cs

[ item.xml ] - RecyclerView 의 한줄 아이템 xml 레이아웃 구성

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
 
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
 
        <ImageView
            android:id="@+id/imageView1"
            android:layout_width="80dp"
            android:layout_height="80dp"/>
 
        <LinearLayout
            android:orientation="vertical"
            android:layout_width="0dp"
            android:layout_weight="3"
            android:layout_height="wrap_content">
 
            <TextView
                android:id="@+id/textView1"
                android:textColor="@android:color/black"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"/>
            <TextView
                android:id="@+id/textView2"
                android:textColor="@android:color/black"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"/>
 
        </LinearLayout>
 
        <LinearLayout
            android:orientation="vertical"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:background="@drawable/badgegreen"
            android:layout_height="wrap_content">
            <TextView
                android:text="클릭"
                android:padding="4dp"
                android:layout_gravity="center|center_vertical"
                android:id="@+id/textView3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"/>
        </LinearLayout>
 
    </LinearLayout>
 
    <TextView
        android:id="@+id/textView4"
        android:textColor="@android:color/black"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>
 cs

[ BookRecyclerAdapter.java ] - RecyclerView 의 Adapter 클래스

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import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
 
import com.bumptech.glide.Glide;
 
import java.util.ArrayList;
 
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
 
public class BookRecyclerAdapter extends RecyclerView.Adapter<BookRecyclerAdapter.ItemViewHolder> {
 
    ArrayList<Book> bookList = new ArrayList<Book>();
 
    @NonNull
    @Override
    public ItemViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
 
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item,parent,false);
        return new ItemViewHolder(view);
    }
 
    @Override
    public void onBindViewHolder(@NonNull ItemViewHolder itemViewHolder, int position) {
        itemViewHolder.onBind(bookList.get(position));
    }
 
    @Override
    public int getItemCount() {
        return bookList.size();
    }
 
    public void addItem(Book book) {
        bookList.add(book);
    }
 
 
    class ItemViewHolder extends RecyclerView.ViewHolder {
 
        private TextView textView1;
        private TextView textView2;
        private TextView textView3;
        private TextView textView4;
        private ImageView imageView1;
 
        private String imgURL;
 
        public ItemViewHolder(@NonNull View itemView) {
            super(itemView);
 
            textView1 = itemView.findViewById(R.id.textView1);
            textView2 = itemView.findViewById(R.id.textView2);
            textView3 = itemView.findViewById(R.id.textView3);
            textView4 = itemView.findViewById(R.id.textView4);
            imageView1 = itemView.findViewById(R.id.imageView1);
        }
 
        // 실제 데이터를 1개의 객체마다 1:1 대응하여 바인딩시킨다.
        void onBind(Book book) {
            textView1.setText(book.getGoods_name());
            textView2.setText(book.getGoods_writer());
            textView3.setText(Integer.toString(book.getSell_price()));
            textView4.setText(book.getGoods_detail1());
            String imgURL = "http://도메인/pds/goods_data/" + book.getGoods_pic1();
 
            // Glide URL로 이미지 불러오기 오픈소스
            Glide.with(itemView).load(imgURL).into(imageView1);
        }
    }
}
 cs

위의 소스에서 이미지를 URL로 그대로 불러오기 위해 오픈소스 Glide 를 사용하였다.

이에 대한 별도의 포스팅을 참고하면 좋을듯하다. ( https://wonpaper.tistory.com/207 )

 

[ BookList01Activity.java ] - 실제 메인 Activity 

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import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
 
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.TextView;
 
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
 
public class BookList01Activity extends AppCompatActivity {
    private BookRecyclerAdapter adapter;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_book_list01);
        setTitle("json 도서목록 자료 불러오기");
 
        RecyclerView recyclerView1 = findViewById(R.id.recyclerView1);
 
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);
        recyclerView1.setLayoutManager(linearLayoutManager);
        recyclerView1.setHasFixedSize(true);
 
        adapter = new BookRecyclerAdapter();
        recyclerView1.setAdapter(adapter);
 
        ThreadProc();
 
    }
    
   // 쓰레드 처리
    private void ThreadProc() {
 
        new Thread() {
            @Override
            public void run() {
                //super.run();
                String str,receiveMsg = "";
 
                String urlStr = "http://각자도메인/json2.php";
                try {
                    URL url = new URL(urlStr);
                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                    conn.setRequestProperty("Content-Type", "application/json;charset=UTF-8");
                    //conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
                    //conn.setRequestProperty("x-waple-authorization", clientKey);
                    if (conn.getResponseCode() == conn.HTTP_OK) {
                        InputStreamReader tmp = new InputStreamReader(conn.getInputStream(), "UTF-8");
                        BufferedReader reader = new BufferedReader(tmp);
                        StringBuffer buffer = new StringBuffer();
                        while ((str = reader.readLine()) != null) {
                            buffer.append(str);
                        }
                        receiveMsg = buffer.toString();
                        //Log.i("receiveMsg : ", receiveMsg);
                        reader.close();
 
                        Bundle bun = new Bundle();
                        bun.putString("jsonGap",receiveMsg);
                        Message msg = handler.obtainMessage();
                        msg.setData(bun);
                        handler.sendMessage(msg);
 
                    } else {
                        Log.i("통신 결과", conn.getResponseCode() + "에러");
                    }
 
                } catch (MalformedURLException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }.start();
    }
 
    private void jsonParsing(String json) {
 
        try {
            JSONObject jsonObject = new JSONObject(json);
            JSONArray bookArr = jsonObject.getJSONArray("book");
 
            for (int i=0;i<bookArr.length();i++) {
                JSONObject bookObj = bookArr.getJSONObject(i);
 
                Book book = new Book();
                book.setGoods_no(Integer.parseInt(bookObj.getString("goods_no")));
                book.setGoods_name(bookObj.getString("goods_name"));
                book.setSell_price(Integer.parseInt(bookObj.getString("sell_price")));
                book.setGoods_writer(bookObj.getString("goods_writer"));
                book.setGoods_detail1(bookObj.getString("goods_detail1"));
                book.setGoods_pic1(bookObj.getString("goods_pic1"));
                
                // BookRecyclerAdapter에 Book 
                adapter.addItem(book);
            }
 
            adapter.notifyDataSetChanged();
 
 
        } catch (JSONException e) {
            e.printStackTrace();
            Log.e("JSON Parsing Error",e.getMessage());
        }
    }
 
    /*
    Handler handler = new Handler() {
        @Override
        public void handleMessage(@NonNull Message msg) {
            //super.handleMessage(msg);
            Bundle bun = msg.getData();
            String str = bun.getString("jsonGap");
 
            jsonParsing(str);
        }
    };
     */
    Handler handler = new Handler(new Handler.Callback() {
        @Override
        public boolean handleMessage(@NonNull Message msg) {
            Bundle bun = msg.getData();
            String str = bun.getString("jsonGap");
 
            jsonParsing(str);
            return true;
        }
    });
}
 cs

위의 메인 Activity 소소를 보면, 46라인의 내용처럼 http 형태의 json 파일을 직접 읽어서 91라인에서 parsing 하여 RecyclerView 형태로 리스트를 보여주는 실제 소스이다. 

이때 http 주소를 그 내용을 직접 읽어 올때에는 쓰레드 형태로 그 항목들을 각각 읽어 와야 한다. 그리고 이 쓰레드를 돌릴때 onCreate함수의 메인쓰레드에서 직접 UI  처리를 할 수가 없다. 이에 그 쓰레드내용 부분에 Handler 라는 놈이 실제 데이터를 처리를 하도록 도와준다.

이러한 쓰레드와 Handler 처리에 대하여 다른 예제 포스팅도 참고하면 좋을듯 하다. 

( https://wonpaper.tistory.com/111 )

 

 

끝으로 AndroidManifest.xml 에 아래의 소스를 한줄 꼭 추가하도록 하자.

1
<uses-permission android:name="android.permission.INTERNET" />
 cs

 

 

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