Android Open Source - abstract-art Thumbnail Adapter

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License

The source code is released under:

GNU General Public License

Java Source Code

package net.georgewhiteside.android.abstractart.settings;
//from w w  w  .  j  av  a2s  .c  om
import java.util.List;

import net.georgewhiteside.android.abstractart.ImageLoader;
import net.georgewhiteside.android.abstractart.ImageLoader.ImageLoadListener;
import net.georgewhiteside.android.abstractart.R;
import net.georgewhiteside.android.abstractart.GLOffscreenSurface;
import net.georgewhiteside.android.abstractart.Renderer;
import net.georgewhiteside.android.abstractart.Wallpaper;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.Handler;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.ViewSwitcher;

// TODO: add code path in Renderer to disregard frame limit when thumbnailing... otherwise it causes a silly slowdown :)

public class ThumbnailAdapter extends BaseAdapter implements ImageLoadListener
{
  private static final String TAG = "ThumbnailAdapter";
  private Context context;
  private LayoutInflater mInflater;
  private ImageLoader imageLoader;
  private Handler handler;
  
  private int thumbnailWidth, thumbnailHeight;
  private GLOffscreenSurface glOffscreenSurface;
  private Renderer renderer;
  
  private List<Integer> backgroundList;
  
  private static final int LOADING_VIEW = 0;
  private static final int THUMBNAIL_VIEW = 1;
  
  public ThumbnailAdapter(Context context, List<Integer> backgroundList, boolean renderEnemies)
  {
    this.context = context;
    
    this.backgroundList = backgroundList;
    thumbnailWidth = 128; thumbnailHeight = 112;
    
    renderer = new Renderer(context);
    
    glOffscreenSurface = new GLOffscreenSurface(thumbnailWidth, thumbnailHeight);
    glOffscreenSurface.setEGLContextClientVersion(2);
    
        mInflater = LayoutInflater.from(context); // Cache the LayoutInflater to avoid asking for a new one each time
        
        handler = new Handler();
        
        
        imageLoader = new ImageLoader(context, renderer, glOffscreenSurface, this, renderEnemies);
        imageLoader.start();
  }
  
  
  public int getCount()
  {
    return renderer.getBackgroundsTotal();
  }

  public Object getItem(int position)
  {
    return position;
  }

  public long getItemId(int position)
  {
    return position;
  }
  
  
  
  /**
     * Make a view to hold each row.
     *
     * http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/List14.html
     */
    public View getView(int position, View convertView, ViewGroup parent)
    {
        // A ViewHolder keeps references to children views to avoid unnecessary calls to findViewById() on each row
        ViewHolder holder;

        if (convertView == null) // Create a new view
        {
            convertView = mInflater.inflate(R.layout.thumbnail_layout, null);
            
            // Creates a ViewHolder and stores references to the children views we want to bind data to
            holder = new ViewHolder();
            holder.viewSwitcher = (ViewSwitcher) convertView.findViewById(R.id.thumbnail_view_switcher);
            holder.text = (TextView) convertView.findViewById(R.id.thumbnail_text);
            holder.thumbnail = (ImageView) convertView.findViewById(R.id.thumbnail_image);
            holder.thumbnailCheckmark = (ImageView) convertView.findViewById(R.id.thumbnail_checkmark);
            
            FrameLayout frameLayout = (FrameLayout) convertView.findViewById(R.id.loading_layout);
            frameLayout.setLayoutParams(new ViewSwitcher.LayoutParams(thumbnailWidth, thumbnailHeight));
            
            convertView.setTag(holder);
        }
        else // Recycle an old view
        {
            holder = (ViewHolder) convertView.getTag();
        }
     
     holder.index = position; // set the image index for the on-screen GridView element so onImageLoaded doesn't override it if it scrolls out of view
     holder.viewSwitcher.setDisplayedChild(LOADING_VIEW);
        imageLoader.queueImageLoad(position, holder);
        
        return convertView;
    }
    
    public void setBackgroundList(List<Integer> backgroundList)
    {
      this.backgroundList = backgroundList;
    }

    public static class ViewHolder
    {
      public int index;
      ViewSwitcher viewSwitcher;
        TextView text;
        ImageView thumbnail;
        ImageView thumbnailCheckmark;
    }
    
    public void updateCheckmark(ViewHolder viewHolder)
    {
      if(backgroundList.contains(new Integer(viewHolder.index)))
    {
      viewHolder.thumbnailCheckmark.setVisibility(ImageView.VISIBLE);
      }
    else
    {
        viewHolder.thumbnailCheckmark.setVisibility(ImageView.INVISIBLE);
      }
    }

  public void onImageLoaded(final ViewHolder viewHolder, final Bitmap bitmap, final int position)
  {
    handler.post(new Runnable()
    {
      public void run()
      {
        // set the grid item to the image thumbnail only if it hasn't scrolled off screen and been recycled
        if(viewHolder.index == position)
        {
          viewHolder.thumbnail.setImageBitmap(bitmap);
          viewHolder.text.setText(String.valueOf(renderer.getRomBackgroundIndex(position)));
          
          updateCheckmark(viewHolder);
          
          viewHolder.viewSwitcher.setDisplayedChild(THUMBNAIL_VIEW);
        }
      }
    });
  }
  
  public void cleanup() {
    Log.i("ThumbnailAdapter", "Cleaning up...");
    imageLoader.stopThread();
  }
}

Java Source Code List

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