Android Open Source - comicsapp Download Task

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From Project

Back to project page comicsapp.

License

The source code is released under:

GNU General Public License

Java Source Code

/* Copyright 2012-2014, Robert Myers */
/*from  w  w w  .ja  va2 s  .  com*/
/*
 * This file is part of ComicsApp.

    ComicsApp is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Comics is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with ComicsApp.  If not, see <http://www.gnu.org/licenses/>
 */
package com.robandjen.comicsapp;

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

import android.os.AsyncTask;
import android.os.OperationCanceledException;

public class DownloadTask extends AsyncTask<Void,Void,Void>{

  public interface DownloadResults {
    void onDownloadComplete(String results);
    void onDownloadFailed(int code);
    void onDownloadFailed(Exception e);
  }
  
  URL mUrl;
  
  DownloadResults mResults;
  String mBody = null;
  int mCode = -1;
  Exception mException = null;
  
  public DownloadTask(URL url,DownloadResults results) {
    mResults=results;
    mUrl = url;
  }
  
  @Override
  protected Void doInBackground(Void... arg0) {
    HttpURLConnection conn = null;
    BufferedInputStream in = null;
    try {
      conn = (HttpURLConnection) mUrl.openConnection();
      mCode = conn.getResponseCode();
      in = new BufferedInputStream(conn.getInputStream());
      ByteArrayOutputStream out = new ByteArrayOutputStream();
      byte[] buffer = new byte[4096];
      int bytesRead;
      do {
        bytesRead = in.read(buffer);
        if (bytesRead > 0) {
          out.write(buffer,0,bytesRead);
        }
        if (isCancelled()) {
          throw new OperationCanceledException();
        }
      }
      while (bytesRead > 0);
      
      mBody = out.toString();
      
    } catch (Exception e) {
      mException = e;
      return null;
    }
    finally {
      if (in != null) {
        try {
          in.close();
        } catch (IOException e) {
        }
      }
      
      if (conn != null) {
        conn.disconnect();
      }
    }
    return null;
  }

  @Override
  protected void onPostExecute(Void result) {
    super.onPostExecute(result);
    if (mResults == null) {
      return;
    }
    
    if (mException != null) {
      mResults.onDownloadFailed(mException);
    } else if (mBody != null) {
      mResults.onDownloadComplete(mBody);
    } else {
      mResults.onDownloadFailed(mCode);
    }
  }
  
  @Override
  protected void onCancelled(Void result) {
    if (mResults == null) {
      return;
    }
    
    mResults.onDownloadFailed(new OperationCanceledException());
  }
}

Java Source Code List

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