[안드로이드]빗썸 api를 사용해서 현재가 정보 가져오기

빗썸거래소에서는 외부 개발자 및 사용자들이  쉽게 이용하여 

서비스 및 애플리케이션을 개발할 수 있도록 api를 제공합니다. 

이번 시간에는 해당 코인을 조회해서 현재가 정보를 가져오는 

어플리케이션을 만들어 보려고 합니다. 

현재가 정보를 어떻게 가져오고 어떻게 화면에  보여주는지에 대해서 알아보려고 합니다. 

1. 환경설정

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.kwon.coin">

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        android:usesCleartextTraffic="true"
        >
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <uses-library
            android:name="org.apache.http.legacy"
            android:required="false" />

    </application>
</manifest>

2. 라이브러리 추가

build.gradle(Module:app)

implementation 'com.android.volley:dc-volley:1.1.0'
implementation 'com.google.code.gson:gson:2.8.6'

3. 클래스 추가

import java.util.HashMap;

public class CoinList {

    HashMap<String , String> data = new HashMap<String, String>();
    String status;
}

4. 화면구성(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" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/coin_nm"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:inputType="text"
            />

        <Button
            android:id="@+id/btn_search"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="현재가 조회" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="시가:"
            />
        <TextView
            android:id="@+id/opening_price"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="종가:"
            />
        <TextView
            android:id="@+id/closing_price"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="저가:"
            />
        <TextView
            android:id="@+id/min_price"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="고가:"
            />
        <TextView
            android:id="@+id/max_price"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="거래량:"
            />
        <TextView
            android:id="@+id/units_traded"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="거래금액:"
            />
        <TextView
            android:id="@+id/acc_trade_value"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="전일종가:"
            />
        <TextView
            android:id="@+id/prev_closing_price"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="최근24시간 거래량:"
            />
        <TextView
            android:id="@+id/units_traded_24H"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="최근 24시간 거래금액:"
            />
        <TextView
            android:id="@+id/acc_trade_value_24H"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="최근24시간 변동가:"
            />
        <TextView
            android:id="@+id/fluctate_24H"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="최근24시간 변동율:"
            />
        <TextView
            android:id="@+id/fluctate_rate_24H"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

</LinearLayout>

5. 기능구현(MainActivity.java)

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.google.gson.Gson;

import java.text.DecimalFormat;
import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

    private RequestQueue requestQueue; //호가

    private TextView opening_price;
    private TextView closing_price;
    private TextView min_price;
    private TextView max_price;
    private TextView units_traded;
    private TextView acc_trade_value;
    private TextView prev_closing_price;
    private TextView units_traded_24H;
    private TextView acc_trade_value_24H;
    private TextView fluctate_24H;
    private TextView fluctate_rate_24H;


    private EditText coinNm;

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

        opening_price       = findViewById(R.id.opening_price);
        closing_price       = findViewById(R.id.closing_price);
        min_price           = findViewById(R.id.min_price);
        max_price           = findViewById(R.id.max_price);
        units_traded        = findViewById(R.id.units_traded);
        acc_trade_value     = findViewById(R.id.acc_trade_value);
        prev_closing_price  = findViewById(R.id.prev_closing_price);
        units_traded_24H    = findViewById(R.id.units_traded_24H);
        acc_trade_value_24H = findViewById(R.id.acc_trade_value_24H);
        fluctate_24H        = findViewById(R.id.fluctate_24H);
        fluctate_rate_24H   = findViewById(R.id.fluctate_rate_24H);


        coinNm = findViewById(R.id.coin_nm);

        Button btnSearch = findViewById(R.id.btn_search);
        btnSearch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                //입력값 변수에 담기
                String nm = coinNm.getText().toString();

                //입력값 체크
                if(nm.equals("") || nm == null){
                    Toast.makeText(getApplication(), "코인이름을 입력해주세요", Toast.LENGTH_SHORT).show();
//                    println("없다");
                }else{
                    //코인값 대문자처리
                    orderbookSelect(nm.toUpperCase());
                }
            }
        });


        if (requestQueue == null) { //호가
            requestQueue = Volley.newRequestQueue(getApplicationContext());
        }
    }


    /**
     * 호가정보 api호출
     * @param coinNm 코인명
     */
    private void orderbookSelect(String coinNm)
    {
        final String coinName = coinNm;

        String url = "https://api.bithumb.com/public/ticker/"+coinNm;
        StringRequest request = new StringRequest(Request.Method.GET, url,
                new Response.Listener<String>()
                {
                    @Override
                    public void onResponse(String response) {
//                        println("응답->" + response);
                        orderBookResponse(response);
                    }
                },
                new Response.ErrorListener()
                {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        println("에러->" + error.getMessage());
                        customToastView("에러!!!");
                    }
                }
        ) {
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                Map<String, String> params = new HashMap<String, String>();
                return params;
            }
        };
        request.setShouldCache(false);
        requestQueue.add(request);
    }

    /**
     * 호가 데이터 정렬
     * @param response 호가정보
     */
    private void orderBookResponse(String response) {

        Gson gson = new Gson();
        CoinList coinInfo = gson.fromJson(response, CoinList.class);

        //상태값이 성공일때만 데이터 뿌려주기
        if(coinInfo.status.equals("0000"))
        {
            String openingPrice     = coinInfo.data.get("opening_price");
            String closingPrice     = coinInfo.data.get("closing_price");
            String minPrice         = coinInfo.data.get("min_price");
            String maxPrice         = coinInfo.data.get("max_price");
            String unitsTraded      = coinInfo.data.get("units_traded");
            String accTradeValue    = coinInfo.data.get("acc_trade_value");
            String prevClosingPrice = coinInfo.data.get("prev_closing_price");
            String unitsTraded24h   = coinInfo.data.get("units_traded_24H");
            String accTradeValue24h = coinInfo.data.get("acc_trade_value_24H");
            String fluctate24h      = coinInfo.data.get("fluctate_24H");
            String fluctateRate24h  = coinInfo.data.get("fluctate_rate_24H");

            //텍스트에 데이터 담기
            opening_price.setText(toDoubleFormat(Double.parseDouble(openingPrice))+"원");
            closing_price.setText(toDoubleFormat(Double.parseDouble(closingPrice))+"원");
            min_price.setText(toDoubleFormat(Double.parseDouble(minPrice))+"원");
            max_price.setText(toDoubleFormat(Double.parseDouble(maxPrice))+"원");
            units_traded.setText(toDoubleFormat(Double.parseDouble(unitsTraded))+"개");
            acc_trade_value.setText(toDoubleFormat(Double.parseDouble(accTradeValue))+"개");
            prev_closing_price.setText(toDoubleFormat(Double.parseDouble(prevClosingPrice))+"원");
            units_traded_24H.setText(toDoubleFormat(Double.parseDouble(unitsTraded24h))+"개");
            acc_trade_value_24H.setText(toDoubleFormat(Double.parseDouble(accTradeValue24h))+"원");
            fluctate_24H.setText(toDoubleFormat(Double.parseDouble(fluctate24h))+"원");
            fluctate_rate_24H.setText(toDoubleFormat(Double.parseDouble(fluctateRate24h))+"%");
        }
    }

    /**
     * 로그 표시
     * @param data 로그
     */
    private void println( String data)
    {
        Log.d("MainActivity" , data);
    }

    /**
     * 커스터마이징 메시지
     * @param text
     */
    private void customToastView(String text){
        Toast toastView = Toast.makeText(getApplication(),text, Toast.LENGTH_SHORT);
        toastView.setGravity(Gravity.CENTER,0,0);
        toastView.show();
    }

    /**
     * 1000자리 콤마
     * @param num
     * @return
     */
    public  String toDoubleFormat(Double num) {

        DecimalFormat df = null;

        if(num >= 100 && num <= 999.9){
            df = new DecimalFormat("000.0");
        }else if(num >= 10 && num <= 99.99){
            df = new DecimalFormat("00.00");
        }else if(num >= 1 && num <= 9.9999){
            df = new DecimalFormat("0.000");
        }else if(num < 1){
            df = new DecimalFormat("0.0000");
        }else{
            df = new DecimalFormat("###,###,###");
        }

        return df.format(num);
    }
}

6. 구동화면

코인명을 입력하고 현재가 조회버튼을 누르면 현재가 정보를 가져옵니다.