How to read file from file to flutter? - flutter

Question

I have code that I use to write data to a file (such as global settings for an application). I write down the data and see. But the problem is that I do not understand how to take these mini data from another page. For example I wrote the word "Test" and I want and I want to assign that word to some variable in another page. I will be grateful for your help. Here is my code:
import 'dart:io';
import 'dart:async';
import 'package:path_provider/path_provider.dart';
import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: "Reading and Writing to Storage",
home: Home(
storage: Storage(),
),
);
}
}
class Home extends StatefulWidget {
final Storage storage;
Home({Key key, #required this.storage}) : super(key: key);
#override
HomeState createState() => HomeState();
}
class HomeState extends State<Home> {
TextEditingController controller = TextEditingController();
String state;
Future<Directory> _appDocDir;
#override
void initState() {
super.initState();
widget.storage.readData().then((String value) {
setState(() {
state = value;
});
});
}
Future<File> writeData() async {
setState(() {
state = controller.text;
controller.text = '';
});
return widget.storage.writeData(state);
}
void getAppDirectory() {
setState(() {
_appDocDir = getApplicationDocumentsDirectory();
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Reading and Writing Files'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Text('${state ?? "File is Empty"}'),
TextField(
controller: controller,
),
RaisedButton(
onPressed: writeData,
child: Text('Write to File'),
),
RaisedButton(
child: Text("Get DIR path"),
onPressed: getAppDirectory,
),
FutureBuilder<Directory>(
future: _appDocDir,
builder:
(BuildContext context, AsyncSnapshot<Directory> snapshot) {
Text text = Text('');
if (snapshot.connectionState == ConnectionState.done) {
if (snapshot.hasError) {
text = Text('Error: ${snapshot.error}');
} else if (snapshot.hasData) {
text = Text('Path: ${snapshot.data.path}');
} else {
text = Text('Unavailable');
}
}
return new Container(
child: text,
);
},
)
],
),
),
);
}
}
class Storage {
Future<String> get localPath async {
final dir = await getApplicationDocumentsDirectory();
return dir.path;
}
Future<File> get localFile async {
final path = await localPath;
return File('$path/db.txt');
}
Future<String> readData() async {
try {
final file = await localFile;
String body = await file.readAsString();
return body;
} catch (e) {
return e.toString();
}
}
Future<File> writeData(String data) async {
final file = await localFile;
return file.writeAsString("$data");
}
}
And scrin:

Answer 1

You can pass the value to other page using Navigator and parameter.
class NewScreen extends StatelessWidget {
final String data;
NewScreen({this.data});
...
}
When you move to 'NewScreen' by using Navigator at your 'Home' page,
pass the data what you transfer.
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => NewScreen(data: 'Test'),
),
);