PROSAGA码农传奇-flutter-行内的TextField导致布局异常：无法计算大小

我收到了一个渲染异常，我不知道如何解决。我正在尝试创建具有3行的列。行[图片]行[TextField]行[按钮]这是我构建容器的代码：
<pre><code>Container buildEnterAppContainer(BuildContext context) {
 var container = new Container(
 padding: const EdgeInsets.all(8.0),
 child: new Column(
 mainAxisAlignment: MainAxisAlignment.start,
 children: <Widget>[
 buildImageRow(context),
 buildAppEntryRow(context),
 buildButtonRow(context)
 ],
 ),
 );
 return container;
 }
</code></pre>和文本容器的buildAppEntryRow代码
<pre><code>Widget buildAppEntryRow(BuildContext context) {
 return new Row(
 children: <Widget>[
 new TextField(
 decoration: const InputDecoration(helperText: "Enter App ID"),
 style: Theme.of(context).textTheme.body1,
 )
 ],
 );
 }
</code></pre>运行时，出现以下异常：
<pre><code>I/flutter ( 7674): BoxConstraints forces an infinite width.
I/flutter ( 7674): These invalid constraints were provided to RenderStack's layout() function by the following
I/flutter ( 7674): function, which probably computed the invalid constraints in question:
I/flutter ( 7674): RenderConstrainedBox.performLayout (package:flutter/src/rendering/proxy_box.dart:256:13)
I/flutter ( 7674): The offending constraints were:
I/flutter ( 7674): BoxConstraints(w=Infinity, 0.0<=h<=Infinity)
</code></pre>如果我将buildAppEntryRow更改为一个TextField而不是这样
<pre><code> Widget buildAppEntryRow2(BuildContext context) {
 return new TextField(
 decoration: const InputDecoration(helperText: "Enter App ID"),
 style: Theme.of(context).textTheme.body1,
 );
 }
</code></pre>我不再例外。行实现导致我无法计算该行的大小，我缺少什么？镖 扑