如何从firebase数据库中获取子值？

I am trying to get values from Firebase Database and set them to text view. My database has multiple child like in image. I want to get the Phone and Address values from it. How can I get them? I am new to Android and I have tried multiple answers here, but failed. Can anyone help me with this?

我正在尝试从Firebase数据库获取值并将其设置为文本视图。我的数据库有多个像图像的孩子。我想从中获取电话和地址值。我怎么能得到它们？我是Android新手，我在这里尝试了多个答案，但都失败了。谁能帮我这个？

1 个解决方案

#1

To get that data, please use the following code:

要获取该数据，请使用以下代码：

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference usersRef = rootRef.child("Users");
ValueEventListener eventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for(DataSnapshot ds : dataSnapshot.getChildren()) {
            String address = ds.child("Address").getValue(String.class);
            String phone = ds.child("Phone").getValue(String.class);
            Log.d("TAG", address + " / " + phone);
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {}
};
usersRef.addListenerForSingleValueEvent(eventListener);

And this is the code to get the address from a single user:

这是从单个用户获取地址的代码：

String uid = firebaseAuth.getCurrentUser().getUid();
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference userRef = rootRef.child("Users").child(uid);
ValueEventListener eventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        String address = dataSnapshot.child("Address").getValue(String.class);
        Log.d("TAG", address);
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {}
};
userRef.addListenerForSingleValueEvent(eventListener);