Flutter: Adding background image with image picker - flutter

Question

so I have a simple question that I can't seem to figure out after a lot of trying out different things. So I have this ImagePicker Flutter function that picks image from gallery. I want to be able to click button to change background of the whole screen. Here is the function for Image Picker and it works fine.
Future _getImage() async {
final pickedFile = await picker.getImage(source: ImageSource.gallery);
setState(() {
if (pickedFile != null) {
_image = File(pickedFile.path);
print('_image: $_image');
} else {
print('No image selected');
}
});
}
The issue is that I can't seem to add that picked image in the BoxDecoration in the Scaffold, there is always an error, something in the vein of: 'The argument type 'Image' can't be assigned to the parameter type 'ImageProvider'
body: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: Image(_image),
),
),
I tried converting to string, linking direct path, but nothing seems to work. Is there a workaround around this or is there some other simple solution? Thank you!

Answer 1

You can copy paste run full code below
You can check _image == null and to show TransparentImage or FileImage
code snippet
import 'package:transparent_image/transparent_image.dart';
...
body: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: _image == null
? MemoryImage(kTransparentImage)
: FileImage(_image),
),
)),
working demo
full code
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:transparent_image/transparent_image.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
File _image;
final picker = ImagePicker();
Future _getImage() async {
final pickedFile = await picker.getImage(source: ImageSource.gallery);
setState(() {
if (pickedFile != null) {
_image = File(pickedFile.path);
print('_image: $_image');
} else {
print('No image selected');
}
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: _image == null
? MemoryImage(kTransparentImage)
: FileImage(_image),
),
)),
floatingActionButton: FloatingActionButton(
onPressed: _getImage,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}

Answer 2

please try this ...
Container(
width: 100,
height: 200,
decoration: BoxDecoration(
image:DecorationImage(
image: new FileImage(file)
)
),
),