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

   1 package com.folioreader.ui.base;
   2
   3 import android.os.AsyncTask;
   4 import android.util.Log;
   5
   6 import com.folioreader.util.AppUtil;
   7
   8 import java.io.BufferedReader;
   9 import java.io.IOException;
  10 import java.io.InputStream;
  11 import java.io.InputStreamReader;
  12 import java.net.URL;
  13 import java.net.URLConnection;
  14
  15 /**
  16  * Background async task which downloads the html content of a web page
  17  * from server
  18  *
  19  * @author by gautam on 12/6/17.
  20  */
  21
  22 public class HtmlTask extends AsyncTask<String, Void, String> {
  23
  24     private static final String TAG = "HtmlTask";
  25
  26     private HtmlTaskCallback callback;
  27
  28     public HtmlTask(HtmlTaskCallback callback) {
  29         this.callback = callback;
  30     }
  31
  32     @Override
  33     protected String doInBackground(String... urls) {
  34         String strUrl = urls[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             return stringBuilder.toString();
  46         } catch (IOException e) {
  47             Log.e(TAG, "HtmlTask failed", e);
  48         }
  49         return null;
  50     }
  51
  52     @Override
  53     protected void onPostExecute(String htmlString) {
  54         if (htmlString != null) {
  55             callback.onReceiveHtml(htmlString);
  56         } else {
  57             callback.onError();
  58         }
  59         cancel(true);
  60     }
  61 }