DownloadImage from web

ListAdapter.java

public class ListAdapter extends BaseAdapter {

private ArrayList listData;

private LayoutInflater layoutInflater;

public ListAdapter(Context context, ArrayList listData) {

this.listData = listData;

layoutInflater = LayoutInflater.from(context);

}

@Override

public int getCount() {

return listData.size();

}

@Override

public Object getItem(int position) {

return listData.get(position);

}

@Override

public long getItemId(int position) {

return position;

}

public View getView(int position, View convertView, ViewGroup parent) {

ViewHolder holder;

if (convertView == null) {

convertView = layoutInflater.inflate(R.layout.list_row_layout, null);

holder = new ViewHolder();

holder.headlineView = (TextView) convertView.findViewById(R.id.title);

holder.reporterNameView = (TextView) convertView.findViewById(R.id.reporter);

holder.reportedDateView = (TextView) convertView.findViewById(R.id.date);

holder.imageView = (ImageView) convertView.findViewById(R.id.thumbImage);

convertView.setTag(holder);

} else {

holder = (ViewHolder) convertView.getTag();

}

MyItem myItem = (MyItem) listData.get(position);

holder.headlineView.setText(myItem.getHeadline());

holder.reporterNameView.setText("By, " + myItem.getReporterName());

holder.reportedDateView.setText(myItem.getDate());

if (holder.imageView != null) {

new ImageDownloaderTask(holder.imageView).execute(myItem.getUrl());

}

return convertView;

}

static class ViewHolder {

TextView headlineView;

TextView reporterNameView;

TextView reportedDateView;

ImageView imageView;

}

}

ImageDownloaderTask.java 

class ImageDownloaderTask extends AsyncTask<String, Void, Bitmap> {

    private final WeakReference<ImageView> imageViewReference;

    public ImageDownloaderTask(ImageView imageView) {

        imageViewReference = new WeakReference<ImageView>(imageView);

    }

    @Override

    protected Bitmap doInBackground(String... params) {

        return downloadBitmap(params[0]);

    }

    @Override

    protected void onPostExecute(Bitmap bitmap) {

        if (isCancelled()) {

            bitmap = null;

        }

        if (imageViewReference != null) {

            ImageView imageView = imageViewReference.get();

            if (imageView != null) {

                if (bitmap != null) {

                    imageView.setImageBitmap(bitmap);

                } else {

                    Drawable placeholder = imageView.getContext().getResources().getDrawable(R.drawable.placeholder);

                    imageView.setImageDrawable(placeholder);

                }

            }

        }

    }

}

private Bitmap downloadBitmap(String url) {

    HttpURLConnection urlConnection = null;

    try {

        URL uri = new URL(url);

        urlConnection = (HttpURLConnection) uri.openConnection();

        int statusCode = urlConnection.getResponseCode();

        if (statusCode != HttpStatus.SC_OK) {

            return null;

        }

        InputStream inputStream = urlConnection.getInputStream();

        if (inputStream != null) {

            Bitmap bitmap = BitmapFactory.decodeStream(inputStream);

            return bitmap;

        }

    } catch (Exception e) {

        urlConnection.disconnect();

        Log.w("ImageDownloader", "Error downloading image from " + url);

    } finally {

        if (urlConnection != null) {

            urlConnection.disconnect();

        }

    }

    return null;

}