title: Downloading Images with progress bar and displaying them in grid view
body: <p>I am new to Android and Java.
  I have URL of 36 images.
  I want to download all those images and display them in grid view.
  I'm referring the code below, So please if some one can edit this code to <strong>download multiple images.</strong> and <strong>display in grid view.</strong>
  The Below code is just taking one URL and downloading image from that
  URL.</p>
  
  <pre><code>package com.example.androidhive;
  
  import java.io.BufferedInputStream;
  import java.io.FileOutputStream;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.net.URL;
  import java.net.URLConnection;
  
  import android.app.Activity;
  import android.app.Dialog;
  import android.app.ProgressDialog;
  import android.graphics.drawable.Drawable;
  import android.os.AsyncTask;
  import android.os.Bundle;
  import android.os.Environment;
  import android.util.Log;
  import android.view.View;
  import android.widget.Button;
  import android.widget.ImageView;
  
  public class AndroidDownloadFileByProgressBarActivity extends Activity {
  
  // button to show progress dialog
  Button btnShowProgress;
  
  // Progress Dialog
  private ProgressDialog pDialog;
  ImageView my_image;
  // Progress dialog type (0 - for Horizontal progress bar)
  public static final int progress_bar_type = 0; 
  
  // File url to download
  private static String file_url = "http://api.androidhive.info/progressdialog/hive.jpg";
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
  
      // show progress bar button
      btnShowProgress = (Button) findViewById(R.id.btnProgressBar);
      // Image view to show image after downloading
      my_image = (ImageView) findViewById(R.id.my_image);
      /**
       * Show Progress bar click event
       * */
      btnShowProgress.setOnClickListener(new View.OnClickListener() {
  
          @Override
          public void onClick(View v) {
              // starting new Async Task
              new DownloadFileFromURL().execute(file_url);
          }
      });
  }
  
  /**
   * Showing Dialog
   * */
  @Override
  protected Dialog onCreateDialog(int id) {
      switch (id) {
      case progress_bar_type: // we set this to 0
          pDialog = new ProgressDialog(this);
          pDialog.setMessage("Downloading file. Please wait...");
          pDialog.setIndeterminate(false);
          pDialog.setMax(100);
          pDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
          pDialog.setCancelable(true);
          pDialog.show();
          return pDialog;
      default:
          return null;
      }
  }
  
  /**
   * Background Async Task to download file
   * */
  class DownloadFileFromURL extends AsyncTask&lt;String, String, String&gt; {
  
      /**
       * Before starting background thread
       * Show Progress Bar Dialog
       * */
      @Override
      protected void onPreExecute() {
          super.onPreExecute();
          showDialog(progress_bar_type);
      }
  
      /**
       * Downloading file in background thread
       * */
      @Override
      protected String doInBackground(String... f_url) {
          int count;
          try {
              URL url = new URL(f_url[0]);
              URLConnection conection = url.openConnection();
              conection.connect();
              // this will be useful so that you can show a tipical 0-100% progress bar
              int lenghtOfFile = conection.getContentLength();
  
              // download the file
              InputStream input = new BufferedInputStream(url.openStream(), 8192);
  
              // Output stream
              OutputStream output = new FileOutputStream("/sdcard/downloadedfile.jpg");
  
              byte data[] = new byte[1024];
  
              long total = 0;
  
              while ((count = input.read(data)) != -1) {
                  total += count;
                  // publishing the progress....
                  // After this onProgressUpdate will be called
                  publishProgress(""+(int)((total*100)/lenghtOfFile));
  
                  // writing data to file
                  output.write(data, 0, count);
              }
  
              // flushing output
              output.flush();
  
              // closing streams
              output.close();
              input.close();
  
          } catch (Exception e) {
              Log.e("Error: ", e.getMessage());
          }
  
          return null;
      }
  
      /**
       * Updating progress bar
       * */
      protected void onProgressUpdate(String... progress) {
          // setting progress percentage
          pDialog.setProgress(Integer.parseInt(progress[0]));
     }
  
      /**
       * After completing background task
       * Dismiss the progress dialog
       * **/
      @Override
      protected void onPostExecute(String file_url) {
          // dismiss the dialog after the file was downloaded
          dismissDialog(progress_bar_type);
  
          // Displaying downloaded image into image view
          // Reading image path from sdcard
          String imagePath = Environment.getExternalStorageDirectory().toString() + "/downloadedfile.jpg";
          // setting downloaded into image view
          my_image.setImageDrawable(Drawable.createFromPath(imagePath));
      }
  
  }
  }
  </code></pre>
  
  <p><strong>Please HELP</strong></p>