Android/folioreader/src/main/java/com/folioreader/ui/base/DictionaryTask.java

   1 package com.folioreader.ui.base;
   2
   3 import android.os.AsyncTask;
   4 import android.util.Log;
   5
   6 import com.fasterxml.jackson.databind.DeserializationFeature;
   7 import com.fasterxml.jackson.databind.ObjectMapper;
   8 import com.folioreader.model.dictionary.Dictionary;
   9 import com.folioreader.util.AppUtil;
  10
  11 import java.io.BufferedReader;
  12 import java.io.IOException;
  13 import java.io.InputStream;
  14 import java.io.InputStreamReader;
  15 import java.net.URL;
  16 import java.net.URLConnection;
  17
  18 /**
  19  * @author gautam chibde on 4/7/17.
  20  */
  21
  22 public class DictionaryTask extends AsyncTask<String, Void, Dictionary> {
  23
  24     private static final String TAG = "DictionaryTask";
  25
  26     private DictionaryCallBack callBack;
  27
  28     public DictionaryTask(DictionaryCallBack callBack) {
  29         this.callBack = callBack;
  30     }
  31
  32     @Override
  33     protected Dictionary doInBackground(String... strings) {
  34         String strUrl = strings[0];
  35         try {
  36             URL url = new URL(strUrl);
  37             URLConnection urlConnection = url.openConnection();
  38             InputStream inputStream = urlConnection.getInputStream();
  39             BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, AppUtil.charsetNameForURLConnection(urlConnection)));
  40             StringBuilder stringBuilder = new StringBuilder();
  41             String line;
  42             while ((line = bufferedReader.readLine()) != null) {
  43                 stringBuilder.append(line);
  44             }
  45
  46             ObjectMapper objectMapper = new ObjectMapper();
  47             objectMapper.enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY);
  48             return objectMapper.readValue(stringBuilder.toString(), Dictionary.class);
  49         } catch (IOException e) {
  50             Log.e(TAG, "DictionaryTask failed", e);
  51         }
  52         return null;
  53     }
  54
  55     @Override
  56     protected void onPostExecute(Dictionary dictionary) {
  57         super.onPostExecute(dictionary);
  58         if (dictionary != null) {
  59             callBack.onDictionaryDataReceived(dictionary);
  60         } else {
  61             callBack.onError();
  62         }
  63         cancel(true);
  64     }
  65 }