GetImageAsyncTask.java

/*
    Copyright (C) 2014 Prasanna Thirumalai
    
    This file is part of StackX.

    StackX is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    StackX is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with StackX.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.prasanna.android.task;

import android.graphics.Bitmap;
import android.os.AsyncTask;

import com.prasanna.android.cache.BitmapCache;
import com.prasanna.android.http.ClientException;
import com.prasanna.android.http.SecureHttpHelper;

public class GetImageAsyncTask extends AsyncTask<String, Void, Bitmap> {
  private final AsyncTaskCompletionNotifier<Bitmap> imageFetchAsyncTaskCompleteNotiferImpl;

  /**
   * 
   * @param imageFetchAsyncTaskCompleteNotiferImpl
   *          Completion notifier to be invoked. Will be invoked from the UI
   *          thread.
   */
  public GetImageAsyncTask(AsyncTaskCompletionNotifier<Bitmap> imageFetchAsyncTaskCompleteNotiferImpl) {
    this.imageFetchAsyncTaskCompleteNotiferImpl = imageFetchAsyncTaskCompleteNotiferImpl;
  }

  @Override
  protected Bitmap doInBackground(String... urls) {
    if (urls != null && urls.length == 1) {
      String url = urls[0];
      if (urls[0].startsWith("//")) url = "http:" + url;

      Bitmap bitmap = BitmapCache.getInstance().get(urls[0]);

      if (bitmap == null) {
        try {
          bitmap = SecureHttpHelper.getInstance().getImage(url);
          BitmapCache.getInstance().add(urls[0], bitmap);
        } catch (ClientException e) {
        }
      }

      return bitmap;
    }

    return null;
  }

  @Override
  protected void onPostExecute(Bitmap bitmap) {
    if (imageFetchAsyncTaskCompleteNotiferImpl != null)
      imageFetchAsyncTaskCompleteNotiferImpl.notifyOnCompletion(bitmap);
  }

}