blocks|key|3081665|text|我也有兴趣知道这件事。我的注册码大小是183个字符。我怀疑它不会超过512个字符，更不用说4K了。想象一下，发送批量通知，4K+reg+id+x+1000+=+4MB消息大小！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3081666|最后，我只是在我的MySQL表中使用'text‘类型来存储注册id。因此，即使google发送给我一个1K、2K或4K+(非常不可能)的reg+id，我也能够处理它。|3081667|更新:我遇到了一个新的注册码大小:+205。|3081668|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I am interested in know about this also. My reg id size is 183 chars. I suspect it won't be longer than 512 chars though, let alone 4K. Imagine sending bulk notification, a 4K reg id x 1000 = 4MB message size! 

In the end, I just use the 'text' type in my MySQL table to store the registration id. So even if google send me a 1K, 2K, or 4K (very unlikely) reg id, I will be able to handle it.

Update: I have come across a new reg id size: 205.

blocks|key|221675|text|在android-gcm论坛上，谷歌的开发者confirms是4k|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|221676|entityMap|0|LINK|mutability|MUTABLE|url|https://groups.google.com/d/msg/android-gcm/q2PzJTP71TY/DNX4lvDu5X4J^0|M|8|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

On android-gcm forum a google's developer <a href="https://groups.google.com/d/msg/android-gcm/q2PzJTP71TY/DNX4lvDu5X4J" rel="noreferrer">confirms</a> it's 4k

blocks|key|3081681|text|这是在GCM文档中所说的，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3081682|一个JSON对象，其字段表示消息有效负载数据的键值对。如果存在，有效负载数据将作为应用程序数据包含在意图中，关键字是额外的名称。例如，"data":{"+score+":"+3x1+"}将产生一个意图额外命名的score，其值是字符串3x1。|3081683|虽然对消息的总大小(4kb)有限制，但对键/值对的数量没有限制。这些值可以是任何JSON对象，但我们建议使用字符串，因为这些值无论如何都会在GCM服务器中转换为字符串。|3081684|如果要包含对象或其他非字符串数据类型(如整数或布尔值)，则必须自己进行字符串转换。还要注意，键不能是保留字(来自或以google开头的任何单词)。|3081685|让事情稍微复杂一点的是，在有效负载数据中有一些技术上允许的保留字(比如collapse_key)。但是，如果请求中还包含该单词，则请求中的值将覆盖有效负载数据中的值。因此，不建议使用在此表中定义为字段名称的单词，即使在技术上允许的情况下也是如此。可选。|3081686|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

This is what has said in GCM doc,

A JSON object whose fields represents the key-value pairs of the message's payload data. If present, the payload data it will be included in the Intent as application data, with the key being the extra's name. For instance, "data":{"score":"3x1"} would result in an intent extra named score whose value is the string 3x1. 

There is no limit on the number of key/value pairs, though there is a limit on the total size of the message (4kb). The values could be any JSON object, but we recommend using strings, since the values will be converted to strings in the GCM server anyway. 

If you want to include objects or other non-string data types (such as integers or booleans), you have to do the conversion to string yourself. Also note that the key cannot be a reserved word (from or any word starting with google.). 

To complicate things slightly, there are some reserved words (such as collapse_key) that are technically allowed in payload data. However, if the request also contains the word, the value in the request will overwrite the value in the payload data. Hence using words that are defined as field names in this table is not recommended, even in cases where they are technically allowed. Optional.

<blockquote>
 Update: <a href="https://developers.google.com/cloud-messaging/" rel="nofollow noreferrer">GCM</a> is deprecated, use <a href="https://firebase.google.com/docs/cloud-messaging/" rel="nofollow noreferrer">FCM</a>
</blockquote>

What is the maximum length for a Registration ID issued by GCM servers? GCM documentation do not provide this info. Googling for this reveals that Registration ID is not fixed length in nature and can be up to 4K (4096 bytes) in length. But these are not official answers from Google. I am currently receiving Registration IDs which are 162 characters long. Can anybody help?

GCM - Max length for Registration ID

服务器

MySQL

JSON

 更新： 已弃用，请使用GCM服务器签发的注册ID的最大长度是多少？GCM文档不提供此信息。谷歌对此的搜索显示，注册ID本质上不是固定长度，长度可以高达4K (4096字节)。但这些都不是来自谷歌的官方答案。我目前收到的注册I长度为162个字符。有人能帮上忙吗？

问GCM -注册ID的最大长度
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