1.9.3 beta#60

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QianJiah wants to merge 9 commits intodonkingliang:masterfrom

QianJiah:1.9.3-beta

Commits on Sep 27, 2019

预览页优化
teach
committed

Commits on Nov 1, 2019

图片剪裁优化，设置图片剪裁宽高比。
teach
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Commits on Nov 20, 2019

提供图片预加载并缓存功能，手机图片搜索加载优化。
teach
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Commits on Dec 5, 2019

由于在Android Q用uri判断图片是否有效的方法耗时，所以去掉判断。
teach
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Commits on Dec 6, 2019

剪裁图片命名添加后缀
teach
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处理图片时间记录不一致的问题
teach
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Commits on May 14, 2020

同步主分支的修改
teach
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Commits on Jul 31, 2020