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[程序员] Android、iOS 的手写笔记软件用的 API,存储的数据结构是什么样的?

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不知道这种手写笔记软件用的是什么 API ?就是很自然的笔触,一条笔画有粗有细。

然后像这类软件一般用什么数据结构存储呢?可以加载的很快,而且只加载视窗显示范围内的数据,还能很好的存储跨平台的额外信息,也有很好的压缩。不过我还没发现跨平台( Android 、iOS )的手写笔记软件,可能都是根据各自平台的 SDK 提供的 API 因其而异来设置存储文件的数据结构?

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