flutter No material widget found textfield widgets require a material widget ancestor

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flutter No material widget found textfield widgets require a material widget ancestor

Error states that TextField widgets require a Material widget ancestor. Simply wrapping your whole loginWidget into Scaffold will solve the problem. Widget LoginPage() { return new Scaffold(body: *your whole code*) }…

TextField widgets require a Material widget ancestor

TextField widget需要被包裹在Scaffold widget中,否则会报错…

Flutter 即学即用系列博客——06 超实用 Widget 集锦

本篇文章我们来讲讲一些比较常用的 Widget. 大家验证的时候使用下面的代码替换 main.dart 代码,然后在 //TODO 语句返回下面常用 Widget 示例的代码. import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { retu…

【译】flutter中如何较好地实现隐藏和显示widget

通常情况下,显示有四种情况: 1.(visible)显示 2.(invisible)隐藏: 这种隐藏是指在屏幕中占据空间,只是没有显示.这种情况出现场景如:用带有背景色的Container Widget去包含一个不可见的Image,当从网络中加载图片后才让它显示,这是为了避免图片显示后让页面布局改变发生跳动. 3.(Offscreen)超出屏幕,同样占据空间 4.(Gone)消失: 这种是指Widget没有被rendered,不存在于wedget tree中考虑到显示隐藏带来的代价,所以我们在…

Widget only supports Widgets as children

Widget only supports Widgets as children https://www.baidu.com/s?wd=Widget%20only%20supports%20Widgets%20as%20children&rsv_spt=1&rsv_iqid=0xc473b15e0012e4a4&issp=1&f=8&rsv_bp=1&rsv_idx=2&ie=utf-8&tn=baiduhome_pg&rsv_ent…

java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.TextView

最近在学习drawerLayout时,遇到这个bug.如下示: java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.TextView 原因: 可能是没有在适配器参数内加入TextView的id. 解决方案: 将原来的适配器参数代码 mDrawerList.setAdapter(new ArrayAdapter<String>(this,R.layout.list…

加载程序到android虚拟机报错： android.widget.RelativeLayout cannot be cast to android.widget.Button

05-23 02:53:48.416: E/Trace(875): error opening trace file: No such file or directory (2) 05-23 02:53:52.545: E/AndroidRuntime(875): FATAL EXCEPTION: main 05-23 02:53:52.545: E/AndroidRuntime(875): java.lang.RuntimeException: Unable to start activity…