Android HTML, 외부주소에서 JSON 파싱해 가져오기

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=".List_Main">

    <TextView
        android:id="@+id/tvString"
        android:layout_width="match_parent"
        android:layout_height="120dp"
        android:background="@drawable/bg"
        android:gravity="center"
        android:textColor="#ffffff"
        android:textSize="30sp"
        app:fontFamily="sans-serif-condensed-light" />
        
</LinearLayout>

 

MainActivity.java

public class MainActivity extends AppCompatActivity {
    private static String IP_ADDRESS = "PHP서버주소";
    private static String TAG = "그룹명";
    private static String filename = "파일명.php";
    private String mJsonString;
    private TextView tvString;
    
  	MainActivity.GetData task;

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

		tvString = (TextView) findViewById(R.id.tvString);

        //처음 시작될 때 AsyncTask 시작
        task = new GetData();
        task.execute("http://" + IP_ADDRESS + "/" + filename, "");

    }
   
   //PHP주소로부터 데이터를 받아오는 함수
   private class GetData extends AsyncTask<String, Void, String> {

        ProgressDialog progressDialog;
        String errorString = null;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

            progressDialog = ProgressDialog.show(List_Main.this,
                    "Please Wait", null, true, true);
        }

        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);
            progressDialog.dismiss();
            Log.d(TAG, "response - " + result);

            mJsonString = result;
            showResult();

        }


        @Override
        protected String doInBackground(String... params) {

            String serverURL = params[0];
            String postParameters = params[1];


            try {

                URL url = new URL(serverURL);
                HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();


                httpURLConnection.setReadTimeout(5000);
                httpURLConnection.setConnectTimeout(5000);
                httpURLConnection.setRequestMethod("POST");
                httpURLConnection.setDoInput(true);
                httpURLConnection.connect();


                OutputStream outputStream = httpURLConnection.getOutputStream();
                outputStream.write(postParameters.getBytes("UTF-8"));
                outputStream.flush();
                outputStream.close();


                int responseStatusCode = httpURLConnection.getResponseCode();
                Log.d(TAG, "response code - " + responseStatusCode);

                InputStream inputStream;
                if (responseStatusCode == HttpURLConnection.HTTP_OK) {
                    inputStream = httpURLConnection.getInputStream();
                } else {
                    inputStream = httpURLConnection.getErrorStream();
                }


                InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "UTF-8");
                BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

                StringBuilder sb = new StringBuilder();
                String line;

                while ((line = bufferedReader.readLine()) != null) {
                    sb.append(line);
                }

                bufferedReader.close();

                return sb.toString().trim();


            } catch (Exception e) {

                Log.d(TAG, "GetData : Error ", e);
                errorString = e.toString();

                return null;
            }

        }
    }


    private void showResult() {

        String TAG_JSON = "그룹명";
        String TAG_INDEX_NO = "field1";
        String TAG_S_DATE = "field2";
        String TAG_STIME = "field3";
        String TAG_ETIME = "field4";
       
        try {
            JSONObject jsonObject = new JSONObject(mJsonString);
            JSONArray jsonArray = jsonObject.getJSONArray(TAG_JSON);


            LastInt = jsonArray.length();

            for (int i = 0; i < jsonArray.length(); i++) {

                JSONObject item = jsonArray.getJSONObject(i);

				mJsonString = item.getString(TAG_INDEX_NO) +", "+ item.getString(TAG_S_DATE)
                +", "+item.getString(TAG_STIME)+", "+item.getString(TAG_ETIME);

            }
			tvString.setText(mJsonString);

        } catch (JSONException e) {

            Log.d(TAG, "showResult : ", e);
        }


    }