I am Created a 3D model and exported the file in the extension .GLB I like to use that file in flutter is there any way to use.
And I have tried with this dependencies model_viewer_plus: ^1.5.0, babylon_dart 1.1.2 and babylonjs_viewer 1.2.1 this and not working.
Try to use model_viewer package inorder to display 3D model in your app.
Try my code to give you an idea:
import 'package:flutter/material.dart';
import 'package:model_viewer/model_viewer.dart';
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: ModelViewer(
src: 'assets/model.glb',
alt: 'A 3D model',
ar: true,
autoPlay: true,
preferredDevicePixelRatio: 1.0,
),
),
);
}
}
A flutter newbie, I'm trying to get my app to take values from a local json file and render them on-screen.
The logic isn't waiting for the class constructor to populate the relevant string variable before rendering the app on screen.
Here's the code that illustrates my problem.
First, my main.dart file:
import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'sampleDataClass.dart';
import 'package:provider/provider.dart';
String assetFilePath = 'assets/basicData.json';
void main() async {
WidgetsFlutterBinding.ensureInitialized();
FlutterError.onError = (details) {
FlutterError.presentError(details);
if (kReleaseMode) exit(1);
};
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({super.key});
#override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
#override
Widget build(BuildContext context) {
return ChangeNotifierProvider(
create: (context) => MyAppState(),
child: const MaterialApp(
title: "Sample screen",
home: MyHomePage(),
)
);
}
}
class MyAppState extends ChangeNotifier {
SampleDataClass current = SampleDataClass(assetFilePath);
}
class MyHomePage extends StatelessWidget {
const MyHomePage({super.key});
#override
Widget build(BuildContext context) {
var myAppState = context.watch<MyAppState>();
var myAppBasicData = myAppState.current;
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.indigo,
foregroundColor: Colors.amberAccent,
title: const Text("This is the App Bar"),
elevation: 10,
),
body: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(children: [
Expanded(
child: Container(
color: Colors.blueGrey,
padding: const EdgeInsets.all(10),
child: (
Text(myAppBasicData.language,
style: const TextStyle(
color: Colors.white,
))))),
]),
]
),
);
}
}
Here is my SampleDataClass.dart file:
import 'dart:core';
import 'dart:convert';
import 'package:flutter/services.dart' show rootBundle;
class SampleDataClass {
String classFilePath = "";
String language = "not populated";
String batteryName = "not populated";
SampleDataClass(filePath) {
rootBundle.loadString(filePath).then((jsonDataString) {
Map classDataMap = jsonDecode(jsonDataString);
language = classDataMap['language'];
print(language);
batteryName = classDataMap['batteryName'];
print(batteryName);
});
}
Map<String, dynamic> toJson() => {
'language': language,
'batteryName': batteryName,
};
}
And here's my pubspec.yaml file:
name: samples
description: A new Flutter project.
environment:
sdk: '>=2.18.6 <3.0.0'
flutter:
sdk: flutter
cupertino_icons: ^1.0.2
provider: ^4.1.1
dev_dependencies:
flutter_test:
sdk: flutter
flutter_lints: ^2.0.0
flutter:
uses-material-design: true
assets:
- assets/basicData.json
Finally, my basicData.json file looks like this:
{
"language": "English",
"batteryName": "Exercise 32"
}
The print statements in the sampleDataClass class work fine but as you can see if you run the code (from the command line using "flutter run --no-sound-null-safety"), the app renders the initial values of the variables before the class constructor assigns the json values to them.
What I expected was the class constructor to complete writing the relevant json values to the class members before handing back the class instance to the build widget in main.dart to render the app on-screen.
I realise that this is a very elementary question, but it is a key pending learning task for me!
Thank you all very much in advance!
it looks like rootBundle is an async function, you have to wait till it finishes then you notify the UI to render with new data,
How to handle this :
you should have 3 states loading state , error state , loaded state ,
create an init(path) function in SampleDataClass class that returns SampleDataClass instance.
Also, in the init() function at the beginning you have to change the state to loading state then when you get the data you set the state to loaded state, then notify listeners this will help the screen to know which state the page is in.
in the screen , call didChangeDependencies() and inside it, call your Provider => init function ( current = contecxt.read<YPUR_PROVIDER>().init(path); )
therefore the current object is being initialized, the page is showing a loader, and once the initialization is done, the provider will notify the page and it will change the loading view to the loaded view (your current view).
Another Tip::
your app will close whenever there is an error, it is not a good practice, since flutter will through non-fatal exception
FlutterError.onError = (details) {
FlutterError.presentError(details);
if (kReleaseMode) exit(1);
There is a choice of two excellent solutions to my problem with very little effort and no need for any change management (yet).
Indeed, so similar is the problem described that I probably should have found it before I posted this query here. As a newbie in this discipline, I clearly didn't conduct my search with the appropriate key words; for that I apologise!
Thanks very much to everyone for your patience.
The two solution options (which even I was able to follow) can be found here:
Calling an async method from a constructor in Dart
Tried to use both NetworkImage and Image.network() methods to load jpg image from the Web, in both cases it says that there is "ImageCodecException" and it's "Fialed to load network image". Tried in DartPad.
This code:
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body:
// Load image from network
new Image.network(
'https://www.nasa.gov/images/content/162056main_PIA08329.jpg'),
),
);
}
}
At first try to wrap your Image.network to Center or something to align Image and the second one is check your url that you provide, you need to provide actual path for that just click to image and simply select "copy image adress" and put it in url. You can also check how to do it here - https://youtu.be/Ln2xvLs6dc4
When removing system overlays with SystemChrome.setEnabledSystemUIOverlays([]) the app does not expand to fill the screen.
Complete main.dart file:
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() {
WidgetsFlutterBinding.ensureInitialized();
SystemChrome.setEnabledSystemUIOverlays([]);
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Container(
color: Colors.red,
),
);
}
}
Without SystemChrome.setEnabledSystemUIOverlays([]):
Flutter version: 1.22.2
I'm unable to reproduce with Flutter 1.22(stable) but in https://github.com/flutter/flutter/issues/14432 people seem to have had good results with
setting Scaffold.resizeToAvoidBottomPadding to true.
You can also try to update Flutter and/or changing channels. Perhaps even trying on a physical device.
I want to implement a App in Flutter that allows the user to view PDF-files and select and copy the text thereinin so that I can proceed using the copied text from the Clipboard.
To be more precise I want want my Code to be somewhat like the following but with a package that allows to copy from the displayed PDF file.
import 'package:flutter/material.dart';
import 'dart:io';
import 'package:pdf_viewer_plugin/pdf_viewer_plugin.dart';
import 'package:flutter/services.dart';
class PDFPage extends StatefulWidget {
final File file;
final Function onPressed;
const PDFPage(this.file,this.onPressed);
#override
_PDFPageState createState() => _PDFPageState();
}
class _PDFPageState extends State<PDFPage> {
#override
void initState() {
Clipboard.setData(ClipboardData(text: ''));
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: PdfViewer(
filePath: widget.file.path,
),
floatingActionButton: FloatingActionButton(
child: Icon(Icons.beach_access),
onPressed: ()async{
ClipboardData data = await Clipboard.getData('text/plain');
widget.onPressed(data);
},
),
);
}
}
The package I am using here is
pdf_viewer_plugin: ^1.0.0+2
That seems not to work. It does display the PDF file but I can't select text or copy from it. I have also tried
flutter_full_pdf_viewer: ^1.0.6
advance_pdf_viewer: ^1.1.6
and some more I can't remind the name of.
Is there a package that allows me to do so, or a modest way to either modify or create such a package?
Thanks a lot.