问题描述
我想为我的应用程序生成一个uuid我尝试了许多东西，如wifi mac地址，获取android id，序列号，从设备创建伪uuid android.os.Build 属性。
我也知道java本身有Uuid创建者类
java.util.UUID / p>
通过浏览几篇文章和博客，我对此并不感到困惑。我想知道，如果两个android设备正在使用这个java类（ java.util.UUID ）创建uuid将会是唯一的还是有复制的机会？ p>
在某些设备中，我无法使用 android.os.Build.SERIAL 找到序列号。是否有替代方法获取设备的序列号
解决方案假设您正在使用java.util.UUID的 randomUUID（）函数有一个理论上的复制机会，但它是非常遥远的。生成的ID是 version-4 ids，它们随机设置了122位。这意味着有5.32 x 10 ^^ 36个可能的值。对于一些观点，如果你有十亿个设备，每秒产生十亿个ID，那么他们将完成大约1680亿年的时间（约10倍的宇宙年龄）。
所以，是的，复制是可能的，但是（假设Java正在使用高质量随机数生成器），其实际发生的几率是非常遥远的，没有意义。
I want to generate a uuid for my app i tried many things like wifi mac address , getting android id, serial number , creating pseudo uuid from device android.os.Build properties .
i also came to know that java itself got Uuid creator class java.util.UUID
by going through several articles and blogs i am little confused about this . i want to know that if two android device are creating uuid using this java class(java.util.UUID) will that be unique or is there any chance for duplication?
Also in some devices i was not able to find serial number using android.os.Build.SERIAL . is there alternative way to get serial number of device
解决方案 Assuming you're using the java.util.UUID's randomUUID() function there's a theoretical chance of duplication, but it's incredibly remote. The ids generated are RFC4122 version-4 ids, which have 122 bits randomly set. That means there are 5.32 x 10^^36 possible values. For some perspective on that, if you had a billion devices, each generating a billion IDs per second, it would take roughly 168 billion years for them to finish (~10X the age of the universe).
So, yes, duplication is possible, but (assuming Java is using a high quality random number generator), the odds of it actually happening are so remote as to be meaningless.
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