两个不同的设备可以有相同的GCM注册ID吗?-CantwodifferentdeviceshavesameGCMRegistrationID?

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a registration ID is tied to a particular Android application running on a particular device.

注册ID与运行在特定设备上的特定Android应用程序绑定。

(from GCM Overview)

(从GCM概述)

Two different devices would always have a different registration id. Even different apps on the same device have different registration ids.

两个不同的设备都有不同的注册id，即使是同一设备上不同的应用程序也有不同的注册id。

Functionally it is safe to keep a UNIQUE_KEY constraint on the Registration ID, but since the Registration ID can be long (up to 4096 bytes, though in practice it's usually much shorter), some databases may prevent you from defining an index or constraint on such a large column. You might want to use a one way hash function that would map the Registration ID to a smaller value, store that value in a smaller column and have the constraint/index on that column.

在功能上，在注册ID上保留UNIQUE_KEY约束是安全的，但是由于注册ID可以很长(最多4096字节，虽然实际上它通常要短得多)，一些数据库可能会阻止您在这么大的列上定义索引或约束。您可能希望使用单向散列函数，该函数将注册ID映射到较小的值，将该值存储在较小的列中，并在该列上具有约束/索引。

When you get NotRegistered error, you should indeed delete that registration ID from your DB (or at least mark it with a status that says it is inactive, and stop sending messages to it). But if the app will be re-installed on a device from which it was earlier uninstalled, the app may get the same registration ID when it registers again to GCM, so your server should allow registration IDs that at one point gave NotRegistered to become active again.

当您获得notregi注册错误时，您确实应该从您的DB中删除注册ID(或者至少将它标记为一个状态，表明它是不活动的，并停止向它发送消息)。但是，如果应用程序将被重新安装到之前卸载的设备上，那么当应用程序再次注册到GCM时，它可能会获得相同的注册ID，因此服务器应该允许注册ID，而在某个时刻，注册ID不会重新激活。

You should update the old registration ID when you get canonical registration ID in the response from Google.

当您在谷歌响应中获得规范注册ID时，您应该更新旧的注册ID。

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It depends. In some cases, I have proved that Two or more devices can have identical Registration IDs. I have a push enabled phonegap app, that is made to run in several devices, all the same kind (brand, model, specs...). For saving time reasons, I decided to make a nandroid backup of one device and then copy that into the others. The result: many devices, the same Reg ID. Hope this helps.

视情况而定。在某些情况下，我已经证明了两个或多个设备可以具有相同的注册id。我有一个支持push的phonegap应用，它可以在不同的设备上运行，所有的设备都是一样的(品牌、型号、规格……)为了节省时间，我决定对一个设备进行nandroid备份，然后将其复制到其他设备中。结果是:许多设备，相同的Reg ID。希望这能有所帮助。

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I am also confused regarding this due to following region, But i am not getting same registration Id as i Creates two demo also.

由于下面的区域，我也很困惑，但是我并没有得到相同的注册Id，因为我也创建了两个demo。

1) But one region, There is Particular sender id for Particular Application and according to that sender id there is a unique Registration id

1)但在一个区域，特定应用程序有特定的发送方id，根据发送方id有唯一的注册id

Check for the Bold Line.As according to this Registration id always different for different application{Copy this line from http://developer.android.com/google/gcm/gcm.html}

检查粗体行。根据这个注册id对于不同的应用总是不同的{从http://developer.android.com/google/gcm/gcm.html}复制这行

Registration ID An ID issued by the GCM servers to the Android application that allows it to receive messages. Once the Android application has the registration ID, it sends it to the 3rd-party application server, which uses it to identify each device that has registered to receive messages for a given Android application. In other words, a registration ID is tied to a particular Android application running on a particular device.

注册ID: GCM服务器向允许它接收消息的Android应用程序发出的ID。一旦Android应用程序有了注册ID，它就会将其发送到第三方应用程序服务器，后者将使用注册ID来识别每个设备，这些设备已经为给定的Android应用程序接收消息。换句话说，注册ID与运行在特定设备上的特定Android应用程序绑定。

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The registration id is unique, what happens sometimes, is that your application changes. If you change the package name, or a whatever key used to be publish, debug or release key, then your registration id changes.

注册id是唯一的，有时发生的是，您的应用程序发生了变化。如果您更改了包名，或者使用了发布、调试或发布键的任何键，那么您的注册id就会更改。