Flutter入门疑难杂症：TextField 双击报错：No Media Query widget found._OverlayEntryWidget widgets require a Media

原因：使用了FlutterEasyLoading，但是没有正确使用导致的。

正确的使用方法：
Flutter Easy Loading 要包括在Material App内，直接贴代码：

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter EasyLoading',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      builder: (BuildContext context, Widget child) {
        return FlutterEasyLoading(
            child: GestureDetector(
          onTap: () {
            FocusScopeNode currentFocus = FocusScope.of(context);
            if (!currentFocus.hasPrimaryFocus) {
              currentFocus.unfocus();
            }
          },
          child: child,
        ));
      },
      home: StartPage(),
    );
  }
}