发送数据时，从 Android 应用中的 Firebase 检索 Se

问题描述

我想知道如何使用 Firebase 的 ServerValue.TIMESTAMP 方法，当我想在 Firebase 服务器上创建时间戳，然后将其检索到本地客户端.

I would like to know how to use Firebase's ServerValue.TIMESTAMP method, when I want to create a timestamp at the Firebase server, and then retrieve it to the local client.

在 Firebase 指南中，只有 javascript 对此案例有更详细的描述，但我很难弄清楚如何将其转换为我的 Android 应用程序.

In Firebase guides, only javascript has a more detailed description of this case, but I'm having a hard time figureing how to translate this in to my Android appliction.

提前致谢！

推荐答案

Firebase.ServerValue.TIMESTAMP 设置为 Map(包含 {.sv:"timestamp"}) 告诉 Firebase 用服务器的时间填充该字段.当该数据被读回时，它是实际的 unix 时间戳，它是一个 Long.

Firebase.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.

这样的事情会起作用:

Firebase ref = new Firebase("https://YOUR-FIREBASE.firebaseio.com");    

ref.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot snapshot) {
        Long timestamp = (Long) snapshot.getValue();
        System.out.println(timestamp);
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {

    }
});

ref.setValue(ServerValue.TIMESTAMP);

再举一个例子，你可以看看我对这个问题的回答:Android 聊天在 DataSnapshot.getValue() 上崩溃

For another example, you can see my answer to this question: Android chat crashes on DataSnapshot.getValue() for timestamp

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