Android Open Source - Music-Share-Android Image Loader

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.paperairplane.music.share.cache;
/*from   w  ww.  j ava2 s . c o m*/
import java.util.Collections;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import com.paperairplane.music.share.MusicData;
import com.paperairplane.music.share.utils.Utilities;


import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.widget.ImageView;

public class ImageLoader {

  private MemoryCache memoryCache = new MemoryCache();
  private Map<ImageView, String> imageViews = Collections
      .synchronizedMap(new WeakHashMap<ImageView, String>());
  private ExecutorService executorService;
    private MusicData mMusicData[];
  private Context mContext;

  public ImageLoader(Context context, MusicData[] musicData) {
    mContext = context;
    executorService = Executors.newFixedThreadPool(5);
    mMusicData = musicData;
  }

  public void DisplayImage(String id, ImageView imageView, boolean isLoadOnlyFromCache) {
    imageViews.put(imageView, id);

    Bitmap bitmap = memoryCache.get(id);
    if (bitmap != null)
      imageView.setImageBitmap(bitmap);
    else if (!isLoadOnlyFromCache){
      queuePhoto(id, imageView);
    }
  }

  private void queuePhoto(String id, ImageView imageView) {
    PhotoToLoad p = new PhotoToLoad(id, imageView);
    executorService.submit(new PhotosLoader(p));
  }

  private Bitmap getBitmap(long id) {
    return Utilities.getLocalArtwork(mContext, id, 48, 48);
  }

  // Task for the queue
  private class PhotoToLoad {
    public String url;
    public ImageView imageView;

    public PhotoToLoad(String u, ImageView i) {
      url = u;
      imageView = i;
    }
  }

  class PhotosLoader implements Runnable {
    PhotoToLoad photoToLoad;

    PhotosLoader(PhotoToLoad photoToLoad) {
      this.photoToLoad = photoToLoad;
    }

    @Override
    public void run() {
      if (imageViewReused(photoToLoad))
        return;
      Bitmap bmp = getBitmap(Long.parseLong(photoToLoad.url));
      memoryCache.put("" + Long.parseLong(photoToLoad.url), bmp);
      if (imageViewReused(photoToLoad))
        return;
      BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad);
      Activity a = (Activity) photoToLoad.imageView.getContext();
      a.runOnUiThread(bd);
    }
  }

  /**
   * 
   * @param photoToLoad
   * @return
   */
  boolean imageViewReused(PhotoToLoad photoToLoad) {
    String tag = imageViews.get(photoToLoad.imageView);
    if (tag == null || !tag.equals(photoToLoad.url))
      return true;
    return false;
  }

  class BitmapDisplayer implements Runnable {
    Bitmap bitmap;
    PhotoToLoad photoToLoad;

    public BitmapDisplayer(Bitmap b, PhotoToLoad p) {
      bitmap = b;
      photoToLoad = p;
    }

    public void run() {
      if (imageViewReused(photoToLoad))
        return;
      if (bitmap != null)
        photoToLoad.imageView.setImageBitmap(bitmap);
  
    }
  }
}

Java Source Code List

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