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backgroun.dart:

//ignore_for_file: prefer_const_constructors
    import 'package:flutter/material.dart';
    class Background extends StatelessWidget {
      final Widget child;
      const Background({
        key? key,
        required this child,
      }) : super(key: key);
      @override
      Widget build(BuildContext context) {
        return Container(
          decoration: BoxDecoration(
            image:DecorationImage(
              image: AssetImage("assets/images/bg.jpg"),
              fit: BoxFit.cover,
            ),
          ),
          child: null
        );
      }
    }

body.dart

import 'package:flutter/material.dart';
    import 'package:flutter_app1/Screens/Welcome/components/background.dart';
    import 'package:flutter_svg/svg.dart';
    class Body extends StatelessWidget {
      @override
      Widget build(BuildContext context) {
        size= MediaQuery.of(context).size;
        //This size provide us total height and width of our screen
        return Background(
          child:SingleChildScrollView(
            child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  Text(
                    "Welcome!\n FREEBIE SIR",
                    style: TextStyle(
                        fontWeight: FontWeight.w500,
                        fontSize: 24.0
                        color:Colors.white),
                  ),
                  SvgPicture.asset("assets/icons/welcome.svg"),
                ]),
          ),
        );
      }
    }

pubspec.yaml

name: flutter_app1
    description: A new Flutter project.
    # The following line prevents the package from being accidentally published to
    # pub.dev using `flutter pub publish`. This is preferred for private packages.
    publish_to: 'none' # Remove this line if you wish to publish to pub.dev
    # The following defines the version and build number for your application.
    # A version number is three numbers separated by dots, like 1.2.43
    # followed by an optional build number separated by a +.
    # Both the version and the builder number may be overridden in flutter
    # build by specifying --build-name and --build-number, respectively.
    # In Android, build-name is used as versionName while build-number used as versionCode.
    # Read more about Android versioning at https://developer.android.com/studio/publish/versioning
    # In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
    # Read more about iOS versioning at
    # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
    version: 1.0.0+1
    environment:
      sdk: ">=2.15.1<3.0.0"
    # Dependencies specify other packages that your package needs in order to work.
    # To automatically upgrade your package dependencies to the latest versions
    # consider running `flutter pub upgrade --major-versions`. alternative,
    # dependencies can be manually updated by changing the version numbers below to
    # the latest version available on pub.dev. To see which dependencies have newer
    # versions available, run `flutter pub outdated`.
    dependencies:
      flutter:
        sdk: flutter
      # The following adds the Cupertino Icons font to your application.
      # Use with the CupertinoIcons class for iOS style icons.
      cupertino_icons: ^1.0.2
      flutter_svg: ^0.19.2+1
    dev_dependencies:
      flutter_test:
        sdk: flutter
      # The "flutter_lints" package below contains a set of recommended lints to
      # encourage good coding practices. The lint set provided by the package is
      # activated in the `analysis_options.yaml` file located at the root of your
      # package. See that file for information about deactivating specific lint
      # rules and activating additional ones.
      flutter_lints: ^1.0.0# For information on the generic Dart part of this file, see the # following page: https://dart.dev/tools/pub/pubspec
    # The following section is specific to Flutter.
    flutter:
      # The following line ensures that the Material Icons font is
      # included with your application, so that you can use the icons in
      # the material Icons class.
      uses-material-design: true
      # To add assets to your application, add an assets section, like this:
      assets:
        -assets/images/
        -assets/icons/
      # An image asset can refer to one or more resolution-specific "variants", see
      # https://flutter.dev/assets-and-images/#resolution-aware.
      # For details regarding adding assets from package dependencies, see
      # https://flutter.dev/assets-and-images/#from-packages
      # To add custom fonts to your application, add a fonts section here,
      # in this "flutter" section. Each entry in this list should have a
      # "family" key with the font family name, and a "fonts" key with a
      # list giving the asset and other descriptors for the font. For
      #example:
      # fonts:
      #-family: Schyler
      # fonts:
      # -asset: fonts/Schyler-Regular.ttf
      # -asset: fonts/Schyler-Italic.ttf
      # style: italic
      #-family: Trajan Pro
      # fonts:
      # -asset: fonts/TrajanPro.ttf
      # -asset: fonts/TrajanPro_Bold.ttf
      #weight: 700
      #
      # For details regarding fonts from package dependencies,
      # see https://flutter.dev/custom-fonts/#from-packages

welcome_screen.dart

import 'package:flutter/material.dart';
    import 'package:flutter_app1/Screens/Welcome/components/body.dart';
    class WelcomeScreen extends StatelessWidget {
      @override
      Widget build(BuildContext context) {
        return Scaffold(
          body: Body(),
        );
      }
    }

main.dart

import 'package:flutter/material.dart';
    import 'package:flutter_app1/Screens/Welcome/welcome_screen.dart';
    import 'package:flutter_app1/constants.dart';
    void main() {
      runApp(const MyApp());
    }
    class MyApp extends StatelessWidget {
      const MyApp({Key? key}) : super(key: key);
      //This widget is the root of your application.
      @override
      Widget build(BuildContext context) {
        return MaterialApp(
          debugShowCheckedModeBanner: false,
          title: 'Flutter Auth',
          theme: ThemeData(
            primaryColor: kPrimaryColor,
            scaffoldBackgroundColor: Colors.white,
          ),
          home: WelcomeScreen(),
        );
      }
    }

Error!

Launching lib\main.dart on Chrome in debug mode...
Error: Cannot run with sound null safety, because the following dependencies
don't support null safety:
 -package:flutter_svg
 -package:xml
 -package:path_drawing
 -package:petitparser
 -package:convert
 -package:path_parsing
For solutions, see https://dart.dev/go/unsound-null-safety
Unhandled exception:
Bad state: Unsupported Null Safety mode NonNullableByDefaultCompiledMode.Invalid, in null.
#0 ProgramCompiler.emitModule (package:dev_compiler/src/kernel/compiler.dart:472:9)
#1 JavaScriptBundler.compile(package:frontend_server/src/javascript_bundle.dart:152:33)
#2 FrontendCompiler.writeJavascriptBundle(package:frontend_server/frontend_server.dart:650:47)
<asynchronous suspension>#3 FrontendCompiler.compile (package:frontend_server/frontend_server.dart:558:9)
<asynchronous suspension>#4 listenAndCompile.<anonymous closure> (package:frontend_server/frontend_server.dart:1135:11)
<asynchronous suspension>the Dart compiler exited unexpectedly.
Failed to compile application.
Exited(sigterm)

only the background is displayed, there are no errors when trying to display the text. But the text is not visible. Error while trying to load svg image. a png image is displayed as a red square with a cross through it inside.

Try using Stack and put the pymer on DartPad.

nazarpunk2022-02-01 12:05:21

The picture is generally displayed, did you register it in pubspeck.yaml in the assets section?

nazarpunk2022-02-01 12:07:09

@nazarpunk pointed out in pubspeck.yaml, attached another screen with an error in the debug console in the description of the problem

Glowinner2022-02-01 12:35:26

Insert the error message as text.

Spatz2022-02-01 12:35:59

@Glowinner why don't you use 2.15.1 that it swears at null-safety?

nazarpunk2022-02-01 12:41:27