[2019.01.30] AsyncTask, API 호출

RestAPIAsyncTask 

import android.content.ContentValues; import android.os.AsyncTask; import android.util.Log; import org.json.JSONObject; public class RestAPIAsyncTask extends AsyncTask<Void, Void, JSONObject>{     private String url;     private ContentValues values;     public RestAPIAsyncTask(String url, ContentValues values){         this.url = url;         this.values = values;     }     @Override     protected void onPreExecute() {         super.onPreExecute();     }     @Override     protected JSONObject doInBackground(Void... params) {         RestAPIConnection restAPIConnection = new RestAPIConnection();         return restAPIConnection.requestPost(url, values);     }     @Override     protected void onProgressUpdate(Void... progress) {     }     @Override     protected void onPostExecute(JSONObject result) {         Log.v("test", result.toString());     } }

RestAPIConnection

import android.content.ContentValues; import org.json.JSONException; import org.json.JSONObject; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.util.Map; public class RestAPIConnection {     private final int READ_TIMEOUT = 10;     private final int CONNECT_TIMEOUT = 10;     // ContentValues to JSON     private JSONObject ContentValuesToStringBuffer(ContentValues params) throws JSONException {         JSONObject jsonObject = new JSONObject();         if (params == null)             return jsonObject;         for (Map.Entry<String, Object> parameter : params.valueSet())             jsonObject.put(parameter.getKey(), parameter.getValue().toString());         return jsonObject;     }     public JSONObject requestPost(String requestURL, ContentValues params) {         HttpURLConnection urlConnection = null;         OutputStream outputStream = null;         InputStream inputStream = null;         ByteArrayOutputStream byteArrayOutputStream = null;         try {             URL url = new URL(requestURL);             JSONObject jsonObject = ContentValuesToStringBuffer(params);             urlConnection = (HttpURLConnection) url.openConnection();             urlConnection.setReadTimeout(READ_TIMEOUT * 1000);             urlConnection.setConnectTimeout(CONNECT_TIMEOUT * 1000);             urlConnection.setRequestMethod("POST");             urlConnection.setDoOutput(true);             urlConnection.setDoInput(true);             urlConnection.setRequestProperty("Accept-Charset", "utf-8"); // Accept-Charset 설정.             urlConnection.setRequestProperty("Cache-Control", "no-cache");             urlConnection.setRequestProperty("Content-Type", "application/json");             urlConnection.setRequestProperty("Accept", "application/json");             // Output stream으로 json을 보냄             outputStream = urlConnection.getOutputStream();             outputStream.write(jsonObject.toString().getBytes());             outputStream.flush();             // 실패할 경우 null return             int responseCode = urlConnection.getResponseCode();             if (responseCode != HttpURLConnection.HTTP_OK)                 return null;             // 성공할 경우             inputStream = urlConnection.getInputStream();             byteArrayOutputStream = new ByteArrayOutputStream();             byte[] byteBuffer = new byte[1024];             byte[] byteData = null;             int nLength = 0;             while((nLength = inputStream.read(byteBuffer, 0, byteBuffer.length)) != -1) {                 byteArrayOutputStream.write(byteBuffer, 0, nLength);             }             byteData = byteArrayOutputStream.toByteArray();             String response = new String(byteData);             JSONObject responseJSON = new JSONObject(response);             return responseJSON;         } catch(JSONException e){             e.printStackTrace();         } catch (MalformedURLException e) {             e.printStackTrace();         } catch (IOException e) {             e.printStackTrace();         } finally {             // 모든 connection, stream을 닫음             if (urlConnection != null)                 urlConnection.disconnect();             if (outputStream != null)                 try{outputStream.close();} catch(Exception e){e.printStackTrace();};             if (inputStream != null)                 try{inputStream.close();} catch(Exception e){e.printStackTrace();};             if (byteArrayOutputStream != null)                 try{byteArrayOutputStream.close();} catch(Exception e){e.printStackTrace();};         }         return null;     } }