Android Open Source - HealthTube Image Downloader

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From Project

Back to project page HealthTube.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.healthtube;
/*from ww  w . j ava  2 s . c  om*/
import java.io.InputStream;
import java.lang.ref.WeakReference;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpGet;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.http.AndroidHttpClient;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.ImageView;

public class ImageDownloader {
  
  /**
     * Method to download an image given an url
     * @param url the image url to download
     * @param imageView the view where introduce the selected image
     */
  public void download(String url, ImageView imageView) {
    BitmapDownloaderTask task = new BitmapDownloaderTask(imageView);
    task.execute(url);
  }
}

class BitmapDownloaderTask extends AsyncTask<String, Void, Bitmap> {
  private String url;
  private final WeakReference<ImageView> imageViewReference;

  /**
     * Constructor. Create a new BitMapDownloader object.
     * @param imageView view where introduce the selected image
     */
  public BitmapDownloaderTask(ImageView imageView) {
    imageViewReference = new WeakReference<ImageView>(imageView);
  }

  @Override
  /**
     * Download method. Run in the task thread
     * @param params comes from the execute() call. params[0] is the url
     * @return a Bitmap with the image
     */
  protected Bitmap doInBackground(String... params) {
    return downloadBitmap(params[0]);
  }

  @Override
  /**
     * Method to associates the image to the imageView once is downloaded
     */
  protected void onPostExecute(Bitmap bitmap) {
    if (isCancelled()) {
      bitmap = null;
    }

    if (imageViewReference != null) {
      ImageView imageView = imageViewReference.get();
      if (imageView != null) {
        imageView.setImageBitmap(bitmap);
      }
    }
  }

  /**
     * Method to download the bitmap of the desired image
     * @param url the image url
     * @return a Bitmap of the desired image
     */
  static Bitmap downloadBitmap(String url) {
    final AndroidHttpClient client = AndroidHttpClient
        .newInstance("Android");
    final HttpGet getRequest = new HttpGet(url);

    try {
      HttpResponse response = client.execute(getRequest);
      final int statusCode = response.getStatusLine().getStatusCode();
      if (statusCode != HttpStatus.SC_OK) {
        Log.w("ImageDownloader", "Error " + statusCode + " while retrieving bitmap from " + url);
        return null;
      }

      final HttpEntity entity = response.getEntity();
      if (entity != null) {
        InputStream inputStream = null;
        try {
          inputStream = entity.getContent();
          final Bitmap bitmap = BitmapFactory
              .decodeStream(inputStream);
          return bitmap;
        } finally {
          if (inputStream != null) {
            inputStream.close();
          }
          entity.consumeContent();
        }
      }
    } catch (Exception e) {
      // Could provide a more explicit error message for IOException or
      // IllegalStateException
      getRequest.abort();
      Log.w("ImageDownloader", "Error while retrieving bitmap from "
          + url);
    } finally {
      if (client != null) {
        client.close();
      }
    }
    return null;
  }
}

Java Source Code List

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