如何隐式更新Android firebase中的节点

DatabaseReference databaseRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference usersRef = databaseRef.child("users");
DatabaseReference childRef = usersRef.child("childNode");

childRef.setValue("new value");

childRef.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        String updatedValue = dataSnapshot.getValue(String.class);
        // 处理更新后的节点值
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {
        // 处理取消操作的情况
    }
});