如何将设备连接到我的Android Firebase数据库 [英] How can I connect a device to my Android firebase database

问题描述

我是Android开发的新手.我正在开发一个已连接到Firebase数据库的应用程序，并且一切正常.现在，我正在尝试连接一个设备，当每个用户在该设备上登录Firebase数据库时，该设备将向每个用户发送出勤信息.我需要http接口来执行此操作还是需要API

I am fairly new to Android development. I am working on an app which I have connected to a firebase database and everything works fine. Now I am trying to connect a device which will send a like an attendance details of each users when they clock in on that device to the firebase database. Do I need a http interface to do this or an API

推荐答案

尝试一下

声明一些变量:

private FirebaseUser user;
private FirebaseDatabase database;
private DatabaseReference mRef;

在onCreate或其他地方初始化它们:

Initialise them inside onCreate or somewhere:

    user = FirebaseAuth.getInstance().getCurrentUser();
    database = FirebaseDatabase.getInstance();
    mRef = database.getReference("users").child(user.getUid()).child("attendance"); //different path for each user

添加值事件监听器

mRef.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {

                Integer attendance = dataSnapshot.getValue(Integer.class);
                attendance++;
                myRef.setValue(attendance);
                }
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });

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