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Fresco SimpleDraweeView was not initialized! 问题

用Fresco进行图片处理，在fragment中报Fresco SimpleDraweeView was not initialized!。
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解决办法：
初次使用很强大的fresco框架，途中遇到很多问题，最大的就是listview中加载图片，，
经过2天时间的“研究”，发现一个可以极大优化内存的方法，
官方文档说“fresco:placeholderImage” 默认加载一张图片，，但后来发现这种方法耗内存极大，
突发奇想，将它换成单颜色，，推荐灰色
跑真机一看，内存下降很多，我的下降了一半，目前整个app维持在50M左右，fresco框架还可以自动释放内存

参考地址
http://bbs.csdn.net/topics/391039842

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