flutter Material示例與MediaQuery.of(context) called with a context that does not contain a MediaQuery.

報錯： flutter MediaQuery.of(context) called with a context that does not contain a MediaQuery. 原因： Scaffold必須放在MaterialApp裏面，否則會報錯 正確示例： import 'package:flutter/material.dart'; main() => runApp(MyApp()

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