在下面的代码中,我以两种不同的方式放置了两个FloatingActionButton,但是在两个键盘都上升,这阻碍了字段填充,因为FAB与TextField在同一行,根据下面的gif.

有什么方法可以解决这个问题吗？

import 'package:flutter/material.dart';
import 'dart:ui' as ui;

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(      
      home: new MyHomePage(),);
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    final ui.Size logicalSize = MediaQuery.of(context).size;
    final double _width = logicalSize.width;
    return new Scaffold(
      appBar: new AppBar(backgroundColor: new Color(0xFF26C6DA)),body: new Stack(
        children: <Widget>[
          new ListView(
            children: <Widget>[
              new TextField(
                decoration: const InputDecoration(
                  labelText: "Description",),style: Theme.of(context).textTheme.title,new TextField(
                decoration: const InputDecoration(
                  labelText: "Description",],new Positioned(
            bottom: 16.0,left: (_width / 2) - 28,child: new FloatingActionButton(
              backgroundColor: new Color(0xFFE57373),child: new Icon(Icons.check),onPressed: (){}
            ),)
        ],floatingActionButton: new FloatingActionButton(
        backgroundColor: new Color(0xFFE57373),);
  }
}