Flutter: how to pass an image file to another screen - flutter-animation

Question

Hi I need some help with passing an image that is selected from my gallery to another screen.
When I go to the 'Pick Image' screen through the grid-tiled screen, I can select an image from my gallery app. As soon as I pick one, the image pops up on the 'Pick Image' screen and it should be passed to the previous screen(grid tiled) so the image can be displayed in a grid tile.
Anyone could handle this?
The relevant part of the code is right below.
Grid Tile screen
Widget build(BuildContext context) {
return GridView.count(crossAxisCount: 4,
children: List.generate(lastDay, (index){
return GridTile(
child: Card(
child: Column(
children: <Widget>[
Text('Day ' '$index'),
SizedBox(height: 20.0,),
IconButton(
icon: Icon(Icons.add),
onPressed: (){
Navigator.push(context,
MaterialPageRoute(builder: (context) => PickImage()));
},),
],
),
),
);
}),
);
}
Pick Image Screen
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'dart:io';
class PickImage extends StatefulWidget {
PickImage() : super();
final String title = "Pick Image";
#override
_PickImageState createState() => _PickImageState();
}
class _PickImageState extends State<PickImage> {
Future<File> imageFile;
pickImageFromGallery(ImageSource source) {
setState(() {
imageFile = ImagePicker.pickImage(source: source);
});
}
Widget showImage() {
return FutureBuilder<File>(
future: imageFile,
builder: (BuildContext context, AsyncSnapshot<File> snapshot) {
if (snapshot.connectionState == ConnectionState.done &&
snapshot.data != null) {
return Image.file(
snapshot.data,
width: 400,
height: 400,
);
} else if (snapshot.error != null) {
return const Text(
'Error Picking Image',
textAlign: TextAlign.center,
);
} else {
return const Text(
'No Image Selected',
textAlign: TextAlign.center,
);
}
},
);
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
showImage(),
RaisedButton(
child: Text("Select Image from Gallery"),
onPressed: () {
pickImageFromGallery(ImageSource.gallery);
},
),
],
),
),
);
}
}

Answer 1

You can copy paste run full code below
Step 1: Use Navigator.pop to return image
RaisedButton(
onPressed: () {
Navigator.pop(context, imageFileReturn);
},
child: Text('Selecct Finish, Go back '),
),
Step 2: Use Map<int, File> keep related index and image
Map<int, File> imageFileMap = {};
IconButton(
icon: Icon(Icons.add),
onPressed: () async {
imageFile = await Navigator.push(context,
MaterialPageRoute(builder: (context) => PickImage()));
imageFileMap[index] = imageFile;
setState(() {});
},
Step 3: Show image in Map
SizedBox(
height: 20.0,
child: imageFileMap[index] != null
? Image.file(
imageFileMap[index],
)
: Container()),
working demo
full code
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'dart:io';
class PickImage extends StatefulWidget {
PickImage() : super();
final String title = "Pick Image";
#override
_PickImageState createState() => _PickImageState();
}
class _PickImageState extends State<PickImage> {
Future<File> imageFile;
File imageFileReturn;
pickImageFromGallery(ImageSource source) {
setState(() {
imageFile = ImagePicker.pickImage(source: source);
});
}
Widget showImage() {
return FutureBuilder<File>(
future: imageFile,
builder: (BuildContext context, AsyncSnapshot<File> snapshot) {
imageFileReturn = snapshot.data;
if (snapshot.connectionState == ConnectionState.done &&
snapshot.data != null) {
return Image.file(
snapshot.data,
width: 400,
height: 400,
);
} else if (snapshot.error != null) {
return const Text(
'Error Picking Image',
textAlign: TextAlign.center,
);
} else {
return const Text(
'No Image Selected',
textAlign: TextAlign.center,
);
}
},
);
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
showImage(),
RaisedButton(
child: Text("Select Image from Gallery"),
onPressed: () {
pickImageFromGallery(ImageSource.gallery);
},
),
RaisedButton(
onPressed: () {
Navigator.pop(context, imageFileReturn);
},
child: Text('Selecct Finish, Go back '),
),
],
),
),
);
}
}
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> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Test(),
);
}
}
class Test extends StatefulWidget {
#override
_TestState createState() => _TestState();
}
class _TestState extends State<Test> {
int lastDay = 30;
Map<int, File> imageFileMap = {};
File imageFile;
#override
Widget build(BuildContext context) {
return GridView.count(
crossAxisCount: 4,
children: List.generate(lastDay, (index) {
return GridTile(
child: Card(
child: Column(
children: <Widget>[
Text('Day ' '$index'),
SizedBox(
height: 20.0,
child: imageFileMap[index] != null
? Image.file(
imageFileMap[index],
)
: Container()),
IconButton(
icon: Icon(Icons.add),
onPressed: () async {
imageFile = await Navigator.push(context,
MaterialPageRoute(builder: (context) => PickImage()));
imageFileMap[index] = imageFile;
setState(() {});
},
),
],
),
),
);
}),
);
}
}