Android Open Source - filemanager Card Previewer

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License

The source code is released under:

MIT License

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Java Source Code

/*******************************************************************************
 * Copyright (c) 2014 Michal Dabski/*from w  w w. j av a 2  s  .com*/
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 ******************************************************************************/
package com.michaldabski.filemanager.folders;

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

import com.michaldabski.filemanager.R;
import com.michaldabski.utils.FilePreviewCache;
import com.michaldabski.utils.FileUtils;

import java.io.File;

public class CardPreviewer extends AsyncTask<File, Void, Bitmap>
{
  ImageView imageView;
  final FilePreviewCache thumbCache;
  File file;
  
  public CardPreviewer(ImageView imageView, FilePreviewCache thumbCache) 
  {
    this.imageView = imageView;
    this.thumbCache = thumbCache;
  }
  
  public void setImageView(ImageView imageView)
  {
    this.imageView = imageView;
    if (imageView != null) imageView.setImageResource(R.drawable.card_image_placeholder);
  }
  
  @Override
  protected Bitmap doInBackground(File... params)
  {
    file = params[0];
    try
    {
      Bitmap bitmap = thumbCache.get(file);
      if (bitmap == null) bitmap = FileUtils.getPreview(file);
      return bitmap;
    }
    catch (Exception e)
    {
      e.printStackTrace();
      return null;
    }
    
  }
  
  @Override
  protected void onPreExecute()
  {
    super.onPreExecute();
    if (imageView != null) imageView.setImageResource(R.drawable.card_image_placeholder);
  }
  
  @Override
  protected void onCancelled(Bitmap result)
  {
    if (result != null)
    {
      thumbCache.put(file, result);
    }
    super.onCancelled(result);
  }
  
  @Override
  protected void onPostExecute(Bitmap result)
  {
    super.onPostExecute(result);
    if (result == null)
    {
      if (imageView != null) imageView.setImageResource(R.drawable.card_image_error);
    }
    else
    {
      thumbCache.put(file, result);
      if (imageView != null) imageView.setImageBitmap(result);
    }
  }

}

Java Source Code List