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我正在搜索很多关于条形码和二维码的图书馆,但我找不到两者都好的图书馆。我需要可以用于二维码和条形码的库。我找到 zxing 但是当平板电脑没有焦点代码时不会扫描。你喜欢哪个或哪些图书馆?我可以使用另外两个库。