You can't do that with flutter. You need an image editor to change the background color.
If you want to change the background color dynamically you will first have to make the background transparent by adding an alpha channel mask to the image (again using an image editor)
You will then be able to define a background color by putting the image inside a widget that has a background color.
Here is a complete example app. The background color changes at random when the widget is reloaded.
import 'dart:math';
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
Color randomColor() =>
Color((Random().nextDouble() * 0xFFFFFF).toInt() << 0).withOpacity(1.0);
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'MyApp',
home: Center(
child: Container(
decoration: BoxDecoration(
color: randomColor(),
),
child: Image.network(
'https://i.stack.imgur.com/O02Ip.png',
),
),
),
);
}
}
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…