ImageLoader.java

package org.shadowsocks;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.HashMap;
import java.util.Stack;

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

public class ImageLoader {

	// Used to display bitmap in the UI thread
	class BitmapDisplayer implements Runnable {
		Bitmap bitmap;
		ImageView imageView;

		public BitmapDisplayer(Bitmap b, ImageView i) {
			bitmap = b;
			imageView = i;
		}

		@Override
		public void run() {
			if (bitmap != null)
				imageView.setImageBitmap(bitmap);
			else
				imageView.setImageResource(stub_id);
		}
	}

	class PhotosLoader extends Thread {
		@Override
		public void run() {
			try {
				while (true) {
					// thread waits until there are any images to load in the
					// queue
					if (photosQueue.photosToLoad.size() == 0)
						synchronized (photosQueue.photosToLoad) {
							photosQueue.photosToLoad.wait();
						}
					if (photosQueue.photosToLoad.size() != 0) {
						PhotoToLoad photoToLoad;
						synchronized (photosQueue.photosToLoad) {
							photoToLoad = photosQueue.photosToLoad.pop();
						}
						Bitmap bmp = getBitmap(photoToLoad.uid);
						cache.put(photoToLoad.uid, bmp);
						Object tag = photoToLoad.imageView.getTag();
						if (tag != null && ((Integer) tag) == photoToLoad.uid) {
							BitmapDisplayer bd = new BitmapDisplayer(bmp,
									photoToLoad.imageView);
							Activity a = (Activity) photoToLoad.imageView
									.getContext();
							a.runOnUiThread(bd);
						}
					}
					if (Thread.interrupted())
						break;
				}
			} catch (InterruptedException e) {
				// allow thread to exit
			}
		}
	}

	// stores list of photos to download
	class PhotosQueue {
		private Stack<PhotoToLoad> photosToLoad = new Stack<PhotoToLoad>();

		// removes all instances of this ImageView
		public void Clean(ImageView image) {
			for (int j = 0; j < photosToLoad.size();) {
				if (photosToLoad.get(j).imageView == image)
					photosToLoad.remove(j);
				else
					++j;
			}
		}
	}

	// Task for the queue
	private class PhotoToLoad {
		public int uid;
		public ImageView imageView;

		public PhotoToLoad(int u, ImageView i) {
			uid = u;
			imageView = i;
		}
	}

	// the simplest in-memory cache implementation. This should be replaced with
	// something like SoftReference or BitmapOptions.inPurgeable(since 1.6)
	private HashMap<Integer, Bitmap> cache = new HashMap<Integer, Bitmap>();

	private File cacheDir;

	private Context context;

	final int stub_id = R.drawable.sym_def_app_icon;

	PhotosQueue photosQueue = new PhotosQueue();

	PhotosLoader photoLoaderThread = new PhotosLoader();

	public ImageLoader(Context c) {
		// Make the background thead low priority. This way it will not affect
		// the UI performance
		photoLoaderThread.setPriority(Thread.NORM_PRIORITY - 1);

		context = c;

		// Find the dir to save cached images
		cacheDir = context.getCacheDir();

	}

	public void clearCache() {
		// clear memory cache
		cache.clear();

		// clear SD cache
		File[] files = cacheDir.listFiles();
		for (File f : files)
			f.delete();
	}

	// decodes image and scales it to reduce memory consumption
	private Bitmap decodeFile(File f) {
		try {
			// decode image size
			BitmapFactory.Options o = new BitmapFactory.Options();
			o.inJustDecodeBounds = true;
			BitmapFactory.decodeStream(new FileInputStream(f), null, o);

			// Find the correct scale value. It should be the power of 2.
			final int REQUIRED_SIZE = 70;
			int width_tmp = o.outWidth, height_tmp = o.outHeight;
			int scale = 1;
			while (true) {
				if (width_tmp / 2 < REQUIRED_SIZE
						|| height_tmp / 2 < REQUIRED_SIZE)
					break;
				width_tmp /= 2;
				height_tmp /= 2;
				scale *= 2;
			}

			// decode with inSampleSize
			BitmapFactory.Options o2 = new BitmapFactory.Options();
			o2.inSampleSize = scale;
			return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
		} catch (FileNotFoundException e) {
		}
		return null;
	}

	public void DisplayImage(int uid, Activity activity, ImageView imageView) {
		if (cache.containsKey(uid))
			imageView.setImageBitmap(cache.get(uid));
		else {
			queuePhoto(uid, activity, imageView);
			imageView.setImageResource(stub_id);
		}
	}

	private Bitmap getBitmap(int uid) {
		// I identify images by hashcode. Not a perfect solution, good for the
		// demo.
		String filename = String.valueOf(uid);
		File f = new File(cacheDir, filename);

		// from SD cache
		Bitmap b = decodeFile(f);
		if (b != null)
			return b;

		// from web
		try {
			BitmapDrawable icon = (BitmapDrawable) Utils.getAppIcon(context,
					uid);
			return icon.getBitmap();
		} catch (Exception ex) {
			return null;
		}
	}

	private void queuePhoto(int uid, Activity activity, ImageView imageView) {
		// This ImageView may be used for other images before. So there may be
		// some old tasks in the queue. We need to discard them.
		photosQueue.Clean(imageView);
		PhotoToLoad p = new PhotoToLoad(uid, imageView);
		synchronized (photosQueue.photosToLoad) {
			photosQueue.photosToLoad.push(p);
			photosQueue.photosToLoad.notifyAll();
		}

		// start thread if it's not started yet
		if (photoLoaderThread.getState() == Thread.State.NEW)
			photoLoaderThread.start();
	}

	public void stopThread() {
		photoLoaderThread.interrupt();
	}

}