Android Open Source - SimpleReader Image Loader

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License

The source code is released under:

Apache License

Java Source Code

package com.dreamteam.app.utils;
//from w ww.j a  va2  s  .c om
import java.io.File;
import java.io.InputStream;
import java.lang.ref.SoftReference;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.widget.ImageView;

import com.dreamteam.app.commons.AppContext;

/**
 * ???????
 * @author Administrator
 */
public class ImageLoader {
  private static HashMap<String, SoftReference<Bitmap>> cache;
  private static Map<ImageView, String> imageViews;
  private static ExecutorService pool;
  private Bitmap defBitmap;
  private OnImageLoadFinishListener imageLoadListener; 
  
  public ImageLoader(OnImageLoadFinishListener imageLoadListener) {
    this.imageLoadListener = imageLoadListener;
  }

  static {
    cache = new HashMap<String, SoftReference<Bitmap>>();
    pool = Executors.newFixedThreadPool(5);
    imageViews = Collections
        .synchronizedMap(new WeakHashMap<ImageView, String>());
  }

  public Bitmap getCacheImage(String url) {
    Bitmap bmp = null;

    if (cache.containsKey(url)) {
      bmp = cache.get(url).get();
    }
    return bmp;
  }

  public void loadImage(String url, ImageView imageView, int width, int height) {
    Logger.warn("tangl", "load image:" + url);
    imageViews.put(imageView, url);
    Bitmap bmp = getCacheImage(url);

    if (bmp != null) {
      Logger.warn("tangl", "load from cache");
      imageView.setImageBitmap(bmp);
    } else {
      File file = AppContext.getSdImgCache(url);
      if (file.exists()) {
        try {
          bmp = BitmapFactory.decodeFile(file.getAbsolutePath());
          imageView.setImageBitmap(bmp);
        } catch (OutOfMemoryError e) {
          e.printStackTrace();
        }
      } else {
        // ??????
        Logger.warn("tangl", "load from network");
        imageView.setImageBitmap(defBitmap);
        loadNetImage(url, imageView, width, height);
      }
    }
  }

  private void loadNetImage(final String url, final ImageView imageView,
      final int width, final int height) {
//    final Handler handler = new Handler() {
//      @Override
//      public void handleMessage(Message msg) {
//        String tag = imageViews.get(imageViews);
//        if (tag != null && tag.equals(url)) {
//          if (msg.obj != null) {
//            imageView.setImageBitmap((Bitmap) msg.obj);
//          }
//        }
//      }
//    };

    pool.execute(new Runnable() {
      @Override
      public void run() {
        try {
          InputStream is = HttpUtils.getInputStream(url);
          Bitmap bmp = BitmapFactory.decodeStream(is);
          bmp = Bitmap.createScaledBitmap(bmp, width, height, true);
          cache.put(url, new SoftReference<Bitmap>(bmp));

//          Message msg = handler.obtainMessage();
//          msg.obj = bmp;
//          handler.sendMessage(msg);
          imageLoadListener.onLoadFinish(bmp);
          ImageUtils.saveImageToSD(bmp, url);
          Logger.warn("tangl", "load finish");
        } catch (Exception e) {
          e.printStackTrace();
        }
      }
    });
  }

  public void setDefBitmap(Bitmap defBitmap) {
    this.defBitmap = defBitmap;
  }
  
  public interface OnImageLoadFinishListener {
    public void onLoadFinish(Bitmap bitmap);
  }
}

Java Source Code List

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