差异页面上的Texfield触发StreamBuilder

Question

我在第1页上有这个StreamBuilder：

Widget _myFirebaseUser(BuildContext context) {
    return StreamBuilder<FirebaseUser>(
      stream: FirebaseAuth.instance.onAuthStateChanged,
      builder: (context, snapshot) {
        if (snapshot.hasData &&
            snapshot.connectionState == ConnectionState.active) {
          print('-loading user2-');
          FirebaseUser user = snapshot.data;
          if (user == null) {
            return Text('not logged in');
          }
          return ListTile(
            leading: CircleAvatar(
              backgroundImage: NetworkImage(
                user.photoUrl,
              ),
            ),
            title: Text(user.displayName),
            subtitle: Text(user.email),
            trailing: new IconButton(
                icon: new Icon(Icons.exit_to_app),
                highlightColor: Colors.pink,
                onPressed: () {
                   Navigator.of(context).pushNamed('/my-set');
                }),
          );
        }
        return Text("loading");
      },
    );
  }

在Page2上我有这个：

TextField(
 controller: inputNewElement,
 decoration: InputDecoration(labelText: "Add Elements"),
 onSubmitted: (elem) {
  print("Changed textfield");
 },
),

当我移至Page2并编辑TextField时，可以看到上一页的日志。我试过StreamBuilder和FutureBuilder的结果相同。

如何避免这种行为？