CachedNetworkImage(
imageUrl: "http://via.placeholder.com/350x150",
placeholder: (context, url) => new CircularProgressIndicator(),
errorWidget: (context, url, error) => new Icon(Icons.error),
),
CachedNetworkImage 图片缓存
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转载自www.cnblogs.com/braveheart007/p/11038607.html
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