Flutter Program ver 3.7.6 and Android Studio Eel ver 2022.1.1 Patch 1

Just fixed the previous issue forgot to turn it on Developer setting for this question -

Now when I run the flutter program - Program listed below

I get the error msg - HiveError: Box not found. Did you forget to call Hive.openBox()? See screenshot below the flutter program How to resolve this hiveError what command to type in for this so-called box?

import 'package:flutter/material.dart';
import 'package:hive_flutter/hive_flutter.dart';
import 'pages/home_page.dart';

void main() async {
// init the hive
await Hive.initFlutter();

// open a box
var box = await Hive.openBox('mbox');

runApp(const MyApp());
}

class MyApp extends StatelessWidget {
const MyApp({super.key});

@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: const HomePage(),
theme: ThemeData(primarySwatch: Colors.yellow),
);
}
}

Flutter Program ver 3.7.6 and Android Studio Eel ver 2022.1.1 Patch 1

How to fix this line Invalid use of private type in public api

Flutter Program ver 3.7.6 and Android Studio Eel ver 2022.1.1 Patch 1

Resolved -Invalid use of private type in public api

_TodoListState createState() => _TodoListState();

By following someone suggestion with line below

But what should I put in for the implementation code. See screenshot

My full code

Thanks to everyone for there help on my previous question.

Using Flutter ver 3.3.8 and Android Studio Dolphin | 2021.3.1 Patch 1 (This is the latest version that i'm using. Since the book is using an older version.)

Modified the Widget with this code see below

Still having issues with this line of code -

if (inValue?.isEmpty) {
return "Please enter username";
}

Flutter shows this msg - A nullable expression can't be used as a condition. Try checking that the value isn't 'null' before using it as a condition. See screenshot of the message listed below. A;so put the full code below the screenshot.

import 'package:flutter/material.dart';

void main() {

runApp(const MyApp());

}



class MyApp extends StatefulWidget {

const MyApp({super.key});

@override

_MyApp createState() => _MyApp();

}


class LoginData {

String username = "";

String password = "";



}



class _MyApp extends State {



LoginData loginData = LoginData();

final GlobalKey<FormState> _formkey = GlobalKey<FormState>();



@override

Widget build(BuildContext inContext) {

return MaterialApp(home: Scaffold(

body : Container(

padding : const EdgeInsets.all(50.0),

child : Form(

key: _formkey,

child: Column(

children: [

TextFormField(

keyboardType: TextInputType.emailAddress,

validator: (String? inValue) {

if (inValue?.isEmpty) {
return "Please enter username";
}

return null;

},
onSaved: (String inValue) {
loginData.username = inValue;
},

decoration: const InputDecoration(
hintText: "[email protected]",
labelText: "Username (eMail address)"
),
),

TextFormField(

obscureText: true,

validator: (String inValue) {
if (inValue.length < 10) {
return "Password must be >=10 in length";
}
return null;
},

onSaved: (String inValue) {
this.loginData.password = inValue;
},

decoration: InputDecoration(
hintText : "Password",
labelText : "Password"
),
),

ElevatedButton(

child : Text("Log In!"),

onPressed: (){

if (_formkey.currentState.validate()){

_formkey.currentState.save();

print ("Username: ${_loginData.username}");

print ("Password: ${_loginData.password}");

}

},

),

]

),

),

),

));

}

}