I just run the basic flutter code. I want to make stateful widget, only containing Text("hi") so I write my code like below

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return Container(child: Text("hi");
  }
}

but I got error No Directionality widget found. RichText widgets require a Directionality widget ancestor

I can fix my error to add textDirection attribute, but I wonder when I use Text I didn't get that error even if I don't use that attribute. I just want to use only Text, Container

CodePudding user response：

i think its because you dont have MaterialApp

try it like this will work

void main() {
  runApp(const MyApp1());
}
class MyApp1 extends StatelessWidget {
  const MyApp1({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
     home: MyApp(),
    );
  }
}
class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return Container(child: Text("hi"));
  }
}

CodePudding user response：

Text needs a Directionality widget to provide information on whether the text is "left-to-right" or "right-to-left". Usually this is done (behind the scene) by MaterialApp widget. If you don't want to use that, you could provide one yourself, and specify the text direction.

Minimal code for a hello world:

import 'package:flutter/material.dart';

void main() {
  runApp(
    Directionality(
      textDirection: TextDirection.ltr,
      child: Text("Hello world."),
    ),
  );
}