Android Open Source - retrowatch Http File Async Task

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2014 The Retro Watch - Open source smart watch project
 *//w w w .ja v  a 2  s . co m
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hardcopy.retrowatch.connectivity;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import com.hardcopy.retrowatch.utils.Logs;
import com.hardcopy.retrowatch.utils.Utils;

import android.os.AsyncTask;


public class HttpFileAsyncTask extends AsyncTask<Void, Integer, String> implements HttpInterface {
  // Global variables
  public static final String tag = "HttpFileAsyncTask";
  
  private int mType;
  private String mID = null;
  private String mURL = null;
  private String mDir = null;
  private String mFileName = null;
  private int mResultStatus = MSG_HTTP_RESULT_CODE_OK;
  
  private static final int CONNECTION_TIMEOUT = 5000;
  
  // Context, system
  private HttpListener mListener;
  

  // Constructor
  public HttpFileAsyncTask(HttpListener l, int type, String id, String url, String directory, String filename) {
    mListener = l;
    mType = type;      // Not used in async task. will be used in callback
    mID = id;        // Not used in async task. will be used in callback
    mURL = url;
    mDir = directory;
    mFileName = filename;
  }

  
  protected String doInBackground(Void... unused) 
  {
    if(mListener==null || mID==null || mURL==null || mDir==null || mFileName==null) { 
      //Logs.d(tag, "###### Error!!! : Parameter is null. Check parameter");
      return ""; 
    }
          
    URL url = null;
    try {
      url = new URL(mURL);
    } 
    catch (MalformedURLException e1) { 
      e1.printStackTrace();
      mResultStatus = MSG_HTTP_RESULT_CODE_ERROR_REQUEST_EXCEPTION;
      Logs.d(tag, "# URL = "+url);
      //Logs.d(tag, "###### Error!!! : MalformedURLException ");
      return null;
    }
    
    if(Utils.checkFileExists(mDir, mFileName))
      return null;
    String filePathAndName = new String(mDir+"/"+mFileName);

    try {
      // Set up connection
      HttpURLConnection conn= (HttpURLConnection)url.openConnection(); 
      conn.setConnectTimeout(CONNECTION_TIMEOUT);
      conn.setReadTimeout(CONNECTION_TIMEOUT);
      conn.connect(); 
      
      // Copy input stream (one is for calculate bitmap size and another is for decode bitmap)
      InputStream inputStream = conn.getInputStream();
      
      // Make file and output stream
      File file = new File(filePathAndName);
      OutputStream outStream = new FileOutputStream(file);
      
      byte[] buf = new byte[1024];
      int len = 0;
      
      while ((len = inputStream.read(buf)) > 0) {
        outStream.write(buf, 0, len);
      }
      outStream.close();
      inputStream.close();
       
      mResultStatus = MSG_HTTP_RESULT_CODE_OK;
       
    } catch (Exception e) {
      mResultStatus = MSG_HTTP_RESULT_CODE_ERROR_UNKNOWN;
      //Logs.d(tag, "###### Error!!! : Cannot download file... ");
      e.printStackTrace();
      return null; 
    }

    return filePathAndName;
  }

  protected void onProgressUpdate(Integer... progress) {
    // TODO: set progress percentage
    // This code runs on UI thread
  }

  protected void onPostExecute(String filename) {
    // This code runs on UI thread
    mListener.OnReceiveFileResponse(mType, mID, filename, mURL, mResultStatus);
  }
  
}

Java Source Code List

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