Downloading a file programatically, from your Android application

I’m  lazy to redo work..So, presenting working code right infront of you :-).I think comments are sufficient to explain how the things are working....

package org.sample.example.download;

import java.io.DataInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.net.URL;

import java.net.URLConnection;

import android.content.Context;

import android.util.Log;

public class DownLoadManager {

      //MAKE SURE YOU HAVE SET INTERNET PERMISSION ....

     

public void startDownLoad(Context context, String sourceUrl,String destinationPath)

      {          

new DownLoadFileThread(context, sourceUrl, destinationPath).start();

      }

     

      private static class DownLoadFileThread extends Thread{

           

            Context context=null;

            String sourceUrl=null;

            String destinationPath=null;

           

            /*

             * Make sure sourceUrl ends with a file to download and not a folder!.

             *  Same with destinationPath.

             *  Ex:

             * 

             *  sourceUrl="http://www.tempurl.com/image1.jpg"

             *  destinationPath="data/data/<package-name>/files/image1.jpg"

             */

public DownLoadFileThread(Context context, String sourceUrl,String destinationPath)

            {

                  this.context=context;

                  this.sourceUrl=sourceUrl;

                  this.destinationPath=destinationPath;

            }

           

            @Override

            public void run()

            {

                  downLoadFileFromServer();

            }

           

            public boolean downLoadFileFromServer()

            {

                  Log.v("DEBUG", "sourceUrl: "+sourceUrl);

                  Log.v("DEBUG", "destinationPath: "+destinationPath);             

                 

                  InputStream urlInputStream=null;

                 

                  URLConnection urlConnection ;

                 

            try

              {

                  //Form a new URL

                  URL finalUrl =new URL(sourceUrl);

                 

                  urlConnection = finalUrl.openConnection();  

                  //Get the size of the (file) inputstream from server..

                  int contentLength=urlConnection.getContentLength();

                 

                  Log.d("1URL","Streaming from "+sourceUrl+ "....");               

      DataInputStream stream = new DataInputStream(finalUrl.openStream());

                 

      Log.d("2FILE","Buffering the received stream(size="+contentLength+") ...");

                  byte[] buffer = new byte[contentLength];

                  stream.readFully(buffer);

                  stream.close();

      Log.d("3FILE","Buffered successfully(Buffer.length="+buffer.length+")...."); 

                 

                  if (buffer.length>0)

                  {

                           try

                           {                   

                                 Log.d("4FILE","Creating the new file..");                                 

                                 FileOutputStream fos = context.openFileOutput(destinationPath, Context.MODE_PRIVATE);

Log.d("5FILE","Writing from buffer to the new file..");

                               fos.write(buffer);

                               fos.flush();

                               fos.close();

                               Log.d("6.1FILE","Created the new file & returning 'true'.."); 

                               return true;

                           }

                           catch (Exception e)

                           {

                                 // TODO Auto-generated catch block

                                 Log.e("7ERROR", "Could not create new file(Path="+destinationPath+") ! & returning 'false'.......");

                                 e.printStackTrace();

                                 return false;

                                 /*Toast.makeText(context, e.toString(), Toast.LENGTH_LONG).show();*/

                           }

                  }

                  else

                  {           

                        //Could not download the file...

Log.e("8ERROR", "Buffer size is zero ! & returning 'false'.......");

                        return false;

                  }

              }

            catch (Exception e)

              {

Log.e("9ERROR", "Failed to open urlConnection/Stream the connection(From catch block) & returning 'false'..");

                  System.out.println("Exception: " + e);

                  e.printStackTrace();

                  return false;

              }

              finally

              {

                  try

                  {

                        Log.d("10URL", "Closing urlInputStream... ");

                      if (urlInputStream != null) urlInputStream.close();

                     

                  }

                  catch (Exception e)

                  {

Log.e("11ERROR", "Failed to close urlInputStream(From finally block)..");

                  }

              }      

            }      

      }

             

}

Once done, you may find your file under DDMS>File Explorer>data/data/package_name/files/

I admit that this isn’t a better way to handle downloading files over internet! You should handle such things asynchronously.  I will be shortly posting the same over here...Till then keep visiting ;-)

Happy coding guys :-)