获取Firebase时间戳 [英] Get Firebase Timestamp

问题描述

我想知道如何从 ServerValue.TIMESTAMP 中直接从HashMap获取timeStamp的值。我知道，当将这个值发送到Firebase时，我会得到很长的值，但是我想在将它发送到Firebase之前得到这个值。

Okie所以经过一番研究，我发现在发送到数据库之前我们不能使用 ServerValue.TIMESTAMP ，因为

<设置为一个Map（包含{.sv：timestamp}），它告诉Firebase使用服务器的时间填充该字段。当这些数据被读回来的时候，它就是一个Long的实际的unix时间戳。

链接

顺便说一下可以使用android自己的时间戳记并将其存储在Firebase中。

 日历cc = Calendar.getInstance（）; 
日期日期= cc.getTime（）; 
 // SimpleDateFormat format1 = new SimpleDateFormat（dd MMM）; 
 SimpleDateFormat format2 = new SimpleDateFormat（yyyyMMddHHmmssSSS）; 
 timestamp = format2.format（date）; 
  

I want to know how can I get the value of the timeStamp from the ServerValue.TIMESTAMP, directly from the HashMap? I know that when that value is sent to Firebase I get the long value, but I want to get that long before send it to Firebase.

解决方案

Okie so after some research I found that we cannot use ServerValue.TIMESTAMP before sending it to database because

ServerValue.TIMESTAMP is set as a Map (containing {.sv: "timestamp"}) which tells Firebase to populate that field with the server's time. When that data is read back, it is the actual unix time stamp which is a Long.

Link

By the way you can use android own timestamp and store it in Firebase.

            Calendar cc = Calendar.getInstance();
            Date date = cc.getTime();
            // SimpleDateFormat format1 = new SimpleDateFormat("dd MMM");
            SimpleDateFormat format2 = new SimpleDateFormat("yyyyMMddHHmmssSSS");
            timestamp = format2.format(date);

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