공공 데이터 포털의 시도별 실시간 측정정보 조회 API를 이용해 실시간측정정보 XML을 Parsing 하여 아래와 같이 <stationName>과 <pm10Value>를 출력하는 프로그램

# 실행 화면

# AndroidManifest.xml

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

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

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
    <uses-permission android:name="android.permission.INTERNET"/>
</manifest>

# 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"
    android:gravity="center"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/data"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

# MainActivity.java  

package kr.ac.skuniv.air_parsing;

import androidx.appcompat.app.AppCompatActivity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.TextView;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends AppCompatActivity {
    TextView tv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("2018305065_전유정");
        tv = (TextView) findViewById(R.id.data);

        String serviceUrl =
"http://openapi.airkorea.or.kr/openapi/services/rest/ArpltnInforInqireSvc/getCtprvnRltmMesureDnsty";
        String serviceKey = 
"BmggWicZAv3%2BOQxar9xrI6hNlsn9%2B%2B13cJPg0FRtn%2BBQ2HThaGn9qrYfb%2FTCSk%2FQGikZVrvxlWEvaamMaR%2FF9w%3D%3D";
        String sidoName = "서울";
        String pageNo = "1";
        String numOfRows = "10";
        String ver = "1.3";
        String strUrl = 
serviceUrl+"?sidoName="+sidoName+"&pageNo="+pageNo+"&numOfRows="+numOfRows+"&ServiceKey="+serviceKey+"&ver="+ver;

        new DownloadWebpageTask().execute(strUrl);
    }

    private class DownloadWebpageTask extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... urls) {
            try {
                return (String)downloadUrl((String)urls[0]);
            } catch (IOException e) {
                return "다운로드 실패";
            }
        }

        protected void onPostExecute(String result) {
            try {
                XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
                factory.setNamespaceAware(true);
                XmlPullParser xpp = factory.newPullParser();

                xpp.setInput(new StringReader(result));
                int eventType = xpp.getEventType();

                String resultCode = "";
                String stationName = "";
                String pm10Value = "";

                boolean bSet_resultCode = false;
                boolean bSet_stationName = false;
                boolean bSet_pm10Value = false;

                while (eventType != XmlPullParser.END_DOCUMENT) {
                    if(eventType == XmlPullParser.START_DOCUMENT) {
                        ;
                    } else if(eventType == XmlPullParser.START_TAG) {
                        String tag_name = xpp.getName();
                        if (tag_name.equals("resultCode"))
                            bSet_resultCode = true;
                        if (tag_name.equals("stationName"))
                            bSet_stationName = true;
                        if (tag_name.equals("pm10Value"))
                            bSet_pm10Value = true;
                    } else if(eventType == XmlPullParser.TEXT) {
                        if (bSet_resultCode) {
                            resultCode = xpp.getText();
                            tv.append("resultCode: " + resultCode + "\n");
                            bSet_resultCode = false;
                        }

                        if (resultCode.equals("00")) {
                            if (bSet_stationName) {
                                stationName = xpp.getText();
                                tv.append("stationName: " + stationName + "\n");
                                bSet_stationName = false;
                            }
                            if (bSet_pm10Value) {
                                pm10Value = xpp.getText();
                                tv.append("pm10Value; " + pm10Value + "\n");
                                bSet_pm10Value = false;
                            }
                        }
                    } else if(eventType == XmlPullParser.END_TAG) {
                        ;
                    }
                    eventType = xpp.next();
                }
            } catch (Exception e) {
                tv.setText(e.getMessage());
            }
        }

        private String downloadUrl(String myurl) throws IOException {

            HttpURLConnection conn = null;
            try {
                URL url = new URL(myurl);
                conn = (HttpURLConnection) url.openConnection();
                BufferedInputStream buf = new BufferedInputStream(conn.getInputStream());
                BufferedReader bufreader = new BufferedReader(new InputStreamReader(buf, "utf-8"));
                String line = null;
                String page = "";
                while((line = bufreader.readLine()) != null) {
                    page += line;
                }

                return page;
            } finally {
                conn.disconnect();
            }
        }
    }
}