DART

image from assets in flutter

Widget build(BuildContext context) {
  return Image(image: AssetImage('graphics/background.png'));
}

image.file flutter

import 'package:flutter/material.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new Scaffold(
        resizeToAvoidBottomPadding: false,
        appBar: new AppBar(
          title: new Text("test"),
        ),
        body: new Container(
          decoration: new BoxDecoration(
            image: new DecorationImage(
              colorFilter: new ColorFilter.mode(Colors.black.withOpacity(0.6), BlendMode.dstATop),
              image: new AssetImage("assets/images/keyboard.jpg"),
              fit: BoxFit.cover,
            ),
          ),
        ),
      ),
    );
  }
}

flutter get image file from assets

import 'dart:async';
import 'dart:io';

import 'package:flutter/services.dart' show rootBundle;
import 'package:path_provider/path_provider.dart';

Future<File> getImageFileFromAssets(String path) async {
  final byteData = await rootBundle.load('assets/$path');

  final file = File('${(await getTemporaryDirectory()).path}/$path');
  await file.writeAsBytes(byteData.buffer.asUint8List(byteData.offsetInBytes, byteData.lengthInBytes));

  return file;
}

File f = await getImageFileFromAssets('images/myImage.jpg');

flutter image assets

  assets:
    - lib/assets/images/

flutter load image from assets

1. add the following codes to 【pubspec.yaml】
____________________________________________________________________________________
assets:
     - assets/xxx/xxx/xxx.jpg
____________________________________________________________________________________
2. call assets with the following code
 AssetImage('assets/xxx/xxx/xxx.jpg')
eg : CircleAvatar(
			radius: 50,
			backgroundImage: AssetImage('assets/images/app_logo/guest.jpg'),)
____________________________________________________________________________________

asset image in flutter

*Note:-
     Very important thing to note while using asset is that:
--> In "pubspec.yaml" file:-
	line with code "uses-material-design: true"
    and line with code "  assets:"
    should lie in same column 
    
--> example:-
  # the material Icons class.
  uses-material-design: true    //this line

  # To add assets to your application, add an assets section, like this:
  assets:                      // and this line (in same column)
     - assets/
--> Don't be oversmart and give your image name too in assets like this:-
  "  assets:
     - assets/onePiece"
     This will cause error....(Believe it)....

Flutter - Display Image From File (File.image & ImageFile) Examples

How to handle image in flutter