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copied!<p>public enum BitmapLoading { INSTANCE;</p> <pre><code>private final Map<String, SoftReference<Bitmap>> cache; private final ExecutorService pool; private Map<ImageView, String> imageViews = Collections.synchronizedMap(new WeakHashMap<ImageView, String>()); private Bitmap placeholder; BitmapLoading() { cache = new HashMap<String, SoftReference<Bitmap>>(); pool = Executors.newFixedThreadPool(5); } public void setPlaceholder(Bitmap bmp) { try { placeholder = bmp; } catch (OutOfMemoryError e) { placeholder.recycle(); bmp.recycle(); placeholder = null; bmp = null; } } public Bitmap getBitmapFromCache(String url) { if (cache.containsKey(url)) { return cache.get(url).get(); } return null; } public void queueJob(final String url, final ImageView imageView,final int width, final int height) { /* Create handler in UI thread. */ final Handler handler = new Handler() { @Override public void handleMessage(Message msg) { String tag = imageViews.get(imageView); if (tag != null && tag.equals(url)) { if (msg.obj != null) { imageView.setImageBitmap((Bitmap) msg.obj); } else { imageView.setImageBitmap(placeholder); Log.d(null, "fail " + url); } } } }; pool.submit(new Runnable() { @Override public void run() { Bitmap bmp = null; try{ bmp = downloadBitmap(url, width, height); Message message = Message.obtain(); message.obj = bmp; handler.sendMessage(message); }catch (OutOfMemoryError e) { bmp.recycle(); bmp = null; } } }); } public void loadBitmap(final String url, final ImageView imageView,final int width, final int height) { imageViews.put(imageView, url); Bitmap bitmap = null ; try { bitmap = getBitmapFromCache(url); if (bitmap != null) { imageView.setImageBitmap(bitmap); } else { imageView.setImageBitmap(placeholder); queueJob(url, imageView, width, height); } } catch (OutOfMemoryError e) { bitmap.recycle(); bitmap = null; System.gc(); } } private Bitmap downloadBitmap(String url, int width, int height) { Bitmap bitmap =null; try { bitmap = BitmapFactory.decodeStream((InputStream) new URL(url).getContent()); bitmap = Bitmap.createScaledBitmap(bitmap, width, height, true); cache.put(url, new SoftReference<Bitmap>(bitmap)); return bitmap; }catch (OutOfMemoryError e) { bitmap.recycle(); bitmap = null; System.gc(); } catch (MalformedURLException e) { } catch (IOException e) { } return null; } </code></pre> <p>}</p>

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