它演示了如何有效地加载大位图在非主UI线程，缓存位图（无论是在内存和磁盘），管理内存位图和UI元素，如ViewPager和ListView/ GridView控件显示位图。-It demonstrates how to load large bitmaps efficiently off the main UI thread, caching bitmaps (both in memory and on disk), managing bitmap memory and displaying b