问题描述
我正在使用Flutter开发一个应用程序.如果我选择MaterialApp作为应用程序的父窗口小部件，则应用程序中的所有Text小部件都带有黄色下划线.另一方面，如果我仅使用Material作为父窗口小部件，则Text小部件下不会显示黄线.
I am developing an app using Flutter. If I choose MaterialApp as the parent widget of my app, all Text widgets in my app are underlined yellow. On the other hand, if I just use Material as the parent widget, no yellow lines are shown under the Text widgets.
Material和MaterialApp有什么区别?
推荐答案
MaterialApp是一个小部件，其中引入了许多有趣的工具，例如Navigator或Theme来帮助您开发应用程序.
MaterialApp is a widget that introduces many interesting tools such as Navigator or Theme to help you develop your app.
Material是一个小部件，用于定义遵循Material规则的UI元素.它定义了什么是海拔，形状和东西.然后被许多重要的小部件(例如Appbar或Card或FloatingButton)重用.
Material is, on the other hand, a widget used to define a UI element respecting Material rules. It defines what elevation is, shape, and stuff. Then reused by many material widgets such as Appbar or Card or FloatingButton.
在Text中可以找到的黄色下划线由MaterialApp引入，作为后备Theme.此处是出于调试目的，警告您需要在Text上方的某个地方使用Material.
The yellow underlines you can find in Text is introduced by MaterialApp as a fallback Theme. It is here for debug purpose, to warn you that you need to use Material somewhere above your Text.
简而言之，请同时使用两者.您的应用程序根目录附近应该有一个MaterialApp.然后，当您要使用Text或InkWell时，请使用引入Material实例(例如Scaffold，Appbar，Dialog等)的小部件.
In short, use both. You should have a MaterialApp near the root of your app. And then use widgets that introduce a Material instance (Such a Scaffold, Appbar, Dialog, ...) when you want to use Text or InkWell.
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