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shared by Vincent Tsao on 25 Jun 10 - Cached

shared by Vincent Tsao on 27 Mar 10 - Cached

But in practice, you will notice that the AsyncTask is limited to 10 threads. This number is hardcoded somewhere in the Android SDK so we cannot change this. In this case it’s a limitation we cannot live with, because often more than 10 images are loaded at the same time.
- Vincent Tsao on 27 Mar 10
  
  使用AsyncTask类开辟的线程还有数量限制？必须小于10，这个倒是以前没有注意到的，要看看源代码怎么实现的
  
  <div class="cArrow"> </div><div class="cContentInner">使用AsyncTask类开辟的线程还有数量限制？必须小于10，这个倒是以前没有注意到的，要看看源代码怎么实现的</div>
  
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I’ve shown you how to improve performance of a ListView in three different ways: By loading images in a seperate thread By reusing rows in the list By caching views within a row
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Notice that I used a SoftReference for caching images, to allow the garbage collector to clean the images from the cache when needed. How it works: Call loadDrawable(imageUrl, imageCallback) providing an anonymous implementation of the ImageCallback interface If the image doesn’t exist in the cache yet, the image is downloaded in a separate thread and the ImageCallback is called as soon as the download is complete. If the image DOES exist in the cache, it is immediately returned and the ImageCallback is never called.
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