I want to Pick a image and then display the picked Image. So I tried doing this->
class ImageUploadChoice extends StatefulWidget {
#override
_ImageUploadChoiceState createState() => _ImageUploadChoiceState();
}
class _ImageUploadChoiceState extends State<ImageUploadChoice> {
File imageFile;
Future getImage(int type) async {
PickedFile pickedImage = await ImagePicker().getImage(
source: type == 1 ? ImageSource.camera : ImageSource.gallery,
imageQuality: 50
);
return pickedImage;
}
For Displaying Image
Expanded(
child: Container(
child: imageFile != null
? Image.file(
imageFile,
height: MediaQuery.of(context).size.height / 5,
)
: Text("Pick up the image"),
),
),
For Calling Function->
new ListTile(
leading: new Icon(
Icons.photo_library,
color: Colors.black,),
title: new Text(
'Photo Library',
style: getTextStyle(MediaQuery.of(context).size.height, "heading2"),
),
onTap: () async {
final tmpFile = await getImage(2);
setState(() {
imageFile = tmpFile;
});
Navigator.pop(context);
Navigator.of(context).pop();
}),
But It's not Working. The Selected Image is not been displayed. What else I need to do?
Made a sample code and it's working fine. Remove following lines
Navigator.pop(context);
Navigator.of(context).pop();
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Test(),
);
}
}
class Test extends StatefulWidget {
#override
_Test createState() => _Test();
}
class _Test extends State<Test> {
File imageFile;
Future getImage() async {
final pickedFile = await ImagePicker().getImage(source: ImageSource.gallery);
setState(() {
if (pickedFile != null) {
imageFile = File(pickedFile.path);
} else {
print('No image selected.');
}
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
floatingActionButton: InkWell(
onTap: (){
getImage();
},
child: Icon(
Icons.add
),
),
body: Center(
child: root(),
),
);
}
Widget root() {
return Container(
child: imageFile != null
? Image.file(
imageFile,
height: MediaQuery
.of(context)
.size
.height / 5,
)
: Text("Pick up the image"),
);
}
}
Related
I'm trying to create a basic Hero animation between a gallery grid view page (using photo manager plugin) and a detail page. When the hero animation is done both back and forward, the picture is flickering .
Here is the example I've made :
The full code runnable :
import 'dart:io';
import 'dart:typed_data';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:photo_manager/photo_manager.dart';
void main() {
runApp(const TestApp());
}
class TestApp extends StatefulWidget {
const TestApp({Key? key}) : super(key: key);
#override
State<TestApp> createState() => _TestAppState();
}
class _TestAppState extends State<TestApp> {
final List<AssetEntity> assetsList = [];
bool granted = false;
void loadAssets() async {
granted = await PhotoManager.requestPermission();
if (granted) {
FilterOptionGroup option = FilterOptionGroup()
..addOrderOption(const OrderOption(
type: OrderOptionType.createDate,
asc: false,
));
final albums = await PhotoManager.getAssetPathList(filterOption: option, type: RequestType.image);
print("albums : $albums");
if (albums.isNotEmpty) {
var alb = albums.where((element) {
return element.name == 'Test';
});
var album = alb.first;
// Now that we got the album, fetch all the assets it contains
List<AssetEntity> currentList =
await album.getAssetListRange(start: 0, end: 200);
// Update the state and notify UI
assetsList.clear();
assetsList.addAll(currentList);
}
setState(() {});
}
}
#override
void initState() {
loadAssets();
super.initState();
}
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: granted
? _gridView()
: Center(
child: Container(
color: Colors.blue,
width: 200,
height: 200,
child: TextButton(
onPressed: () async {
granted = await PhotoManager.requestPermission();
setState(() {});
},
child: const Text(
"Ask permission",
style: TextStyle(color: Colors.white),
),
)),
)),
);
}
Widget _gridView() {
return GridView.builder(
itemCount: assetsList.length,
gridDelegate:
const SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 3),
itemBuilder: (context, index) {
return Hero(
createRectTween: (Rect? begin, Rect? end) {
RectTween _rectTween = RectTween(begin: begin, end: end);
return _rectTween;
},
tag: assetsList[index].id,
child: GalleryThumbnail(
asset: assetsList[index],
onTap: (bytes) {
Navigator.push(context, MaterialPageRoute(builder: (context) {
return DetailsPage(asset: assetsList[index], bytes: bytes);
}));
},
));
});
}
}
class GalleryThumbnail extends StatelessWidget {
final AssetEntity asset;
final ValueChanged<Uint8List> onTap;
const GalleryThumbnail({Key? key, required this.asset, required this.onTap})
: super(key: key);
#override
Widget build(BuildContext context) {
return FutureBuilder<Uint8List?>(
future: Platform.isIOS
? asset.thumbDataWithOption(
ThumbOption.ios(
width: 500,
height: 500,
deliveryMode: DeliveryMode.opportunistic,
resizeMode: ResizeMode.fast,
resizeContentMode: ResizeContentMode.fit,
quality: 100
// resizeContentMode: ResizeContentMode.fill,
),
)
: asset.thumbDataWithSize(250, 250),
builder: (_, snapshot) {
final bytes = snapshot.data;
if (snapshot.hasError) {
return Container();
}
// If we have no data
if (bytes == null) return Container();
// If there's data, display it as an image
return GestureDetector(
onTap: () {
onTap(bytes);
},
child: Image.memory(bytes, fit: BoxFit.cover,gaplessPlayback: true,));
},
);
}
}
class DetailsPage extends StatefulWidget {
final AssetEntity asset;
final Uint8List bytes;
const DetailsPage({Key? key, required this.asset, required this.bytes})
: super(key: key);
#override
_DetailsPageState createState() => _DetailsPageState();
}
class _DetailsPageState extends State<DetailsPage> {
late ImageProvider _imageProvider;
Future<void> loadFile() async {
try {
File? file = await widget.asset.file;
if (file == null) return;
_imageProvider = Image.file(file).image;
setState(() {});
} catch (e) {
print("error to load file : " + e.toString());
}
}
#override
void initState() {
_imageProvider = Image.memory(widget.bytes).image;
loadFile();
super.initState();
}
#override
Widget build(BuildContext context) {
double ratio = widget.asset.height / widget.asset.width;
return Scaffold(
body: Stack(
children: [
Hero(
createRectTween: (Rect? begin, Rect? end) {
RectTween _rectTween = RectTween(begin: begin, end: end);
return _rectTween;
},
tag: widget.asset.id,
child: Center(
child: Image(image: _imageProvider,
width: MediaQuery.of(context).size.width,
height: MediaQuery.of(context).size.height*ratio,
gaplessPlayback: true),
),
),
const SafeArea(
child: Padding(
padding: EdgeInsets.all(8.0),
child: BackButton(),
)),
],
),
);
}
}
I've implemented hero animation somewhere else in my project and I'm not getting this behavior where as here I do.
Why this is happening and how to correct this ?
Add
transitionOnUserGestures: true,
to Hero() widget in current & next page
This happens because the Hero of the image thumbail wraps the FutureBuilder, and then the future triggers again during the animation, wraps the Image instead of the FutureBuilder.
I have this following Flutter / dart code which let me open the camera / gallery to select a picture. But i don't want to show the image immediately on the screen (as it is here). I want the Image to deal with it, so saving it maybe or getting the image like 'Image.asset("")'. Main thing i can do something with the image after choosing it.
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
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: 300,
height: 300,
);
}
else {
return Text("error");
}
},
);
}
bildmachen(ImageSource quelle) {
pickImageFromGallery(quelle);
Widget bildAusgabe = showImage();
Navigator.of(context).push(MaterialPageRoute(
builder: (BuildContext context) => Bildzeige(bildAusgabe)));
}
#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("gehtschon?"),
onPressed: () {
bildmachen(ImageSource.gallery);
},
),
],
),
),
backgroundColor: Colors.yellowAccent,
);
}
}
Thanks
If you want to save the selected image from the ImagePicker in a File object
you may do it like this
File _imageFile;
final picker = ImagePicker();
.
.
.
Future getImage() async {
final pickedFile = await picker.getImage(source: ImageSource.gallery);
setState(() {
if (pickedFile != null) {
_imageFile = File(pickedFile.path);
}
});
}
// the getImage() method will opens the ImagePicker and the selected image will be stored in _imageFile
I hope this solution helps
I tried to find how to select and upload multiple images in flutter but most of the plugins are not working or I did not understand them well. I found little application but it selects and upload only one picture. How to change this code that user can select and upload multiple pictures or is there any other alternatives. Please write in details, i am freshman in coding. Thanks in advance.
import 'package:flutter/material.dart';
import 'dart:io';
import 'package:http/http.dart' as http;
import 'package:image_picker/image_picker.dart';
import 'package:mime/mime.dart';
import 'dart:convert';
import 'package:http_parser/http_parser.dart';
import 'package:toast/toast.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Image Upload Demo',
theme: ThemeData(primarySwatch: Colors.pink),
home: ImageInput());
}
}
class ImageInput extends StatefulWidget {
#override
State<StatefulWidget> createState() {
return _ImageInput();
}
}
class _ImageInput extends State<ImageInput> {
// To store the file provided by the image_picker
File _imageFile;
// To track the file uploading state
bool _isUploading = false;
String baseUrl = 'http://YOUR_IPV4_ADDRESS/flutterdemoapi/api.php';
void _getImage(BuildContext context, ImageSource source) async {
File image = await ImagePicker.pickImage(source: source);
setState(() {
_imageFile = image;
});
// Closes the bottom sheet
Navigator.pop(context);
}
Future<Map<String, dynamic>> _uploadImage(File image) async {
setState(() {
_isUploading = true;
});
// Find the mime type of the selected file by looking at the header bytes of the file
final mimeTypeData =
lookupMimeType(image.path, headerBytes: [0xFF, 0xD8]).split('/');
// Intilize the multipart request
final imageUploadRequest =
http.MultipartRequest('POST', Uri.parse(baseUrl));
// Attach the file in the request
final file = await http.MultipartFile.fromPath('image', image.path,
contentType: MediaType(mimeTypeData[0], mimeTypeData[1]));
// Explicitly pass the extension of the image with request body
// Since image_picker has some bugs due which it mixes up
// image extension with file name like this filenamejpge
// Which creates some problem at the server side to manage
// or verify the file extension
imageUploadRequest.fields['ext'] = mimeTypeData[1];
imageUploadRequest.files.add(file);
try {
final streamedResponse = await imageUploadRequest.send();
final response = await http.Response.fromStream(streamedResponse);
if (response.statusCode != 200) {
return null;
}
final Map<String, dynamic> responseData = json.decode(response.body);
_resetState();
return responseData;
} catch (e) {
print(e);
return null;
}
}
void _startUploading() async {
final Map<String, dynamic> response = await _uploadImage(_imageFile);
print(response);
// Check if any error occured
if (response == null || response.containsKey("error")) {
Toast.show("Image Upload Failed!!!", context,
duration: Toast.LENGTH_LONG, gravity: Toast.BOTTOM);
} else {
Toast.show("Image Uploaded Successfully!!!", context,
duration: Toast.LENGTH_LONG, gravity: Toast.BOTTOM);
}
}
void _resetState() {
setState(() {
_isUploading = false;
_imageFile = null;
});
}
void _openImagePickerModal(BuildContext context) {
final flatButtonColor = Theme.of(context).primaryColor;
print('Image Picker Modal Called');
showModalBottomSheet(
context: context,
builder: (BuildContext context) {
return Container(
height: 150.0,
padding: EdgeInsets.all(10.0),
child: Column(
children: <Widget>[
Text(
'Pick an image',
style: TextStyle(fontWeight: FontWeight.bold),
),
SizedBox(
height: 10.0,
),
FlatButton(
textColor: flatButtonColor,
child: Text('Use Camera'),
onPressed: () {
_getImage(context, ImageSource.camera);
},
),
FlatButton(
textColor: flatButtonColor,
child: Text('Use Gallery'),
onPressed: () {
_getImage(context, ImageSource.gallery);
},
),
],
),
);
});
}
Widget _buildUploadBtn() {
Widget btnWidget = Container();
if (_isUploading) {
// File is being uploaded then show a progress indicator
btnWidget = Container(
margin: EdgeInsets.only(top: 10.0),
child: CircularProgressIndicator());
} else if (!_isUploading && _imageFile != null) {
// If image is picked by the user then show a upload btn
btnWidget = Container(
margin: EdgeInsets.only(top: 10.0),
child: RaisedButton(
child: Text('Upload'),
onPressed: () {
_startUploading();
},
color: Colors.pinkAccent,
textColor: Colors.white,
),
);
}
return btnWidget;
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Image Upload Demo'),
),
body: Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.only(top: 40.0, left: 10.0, right: 10.0),
child: OutlineButton(
onPressed: () => _openImagePickerModal(context),
borderSide:
BorderSide(color: Theme.of(context).accentColor, width: 1.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Icon(Icons.camera_alt),
SizedBox(
width: 5.0,
),
Text('Add Image'),
],
),
),
),
_imageFile == null
? Text('Please pick an image')
: Image.file(
_imageFile,
fit: BoxFit.cover,
height: 300.0,
alignment: Alignment.topCenter,
width: MediaQuery.of(context).size.width,
),
_buildUploadBtn(),
],
),
);
}
}
I used that package:
dependencies:
multi_image_picker: ^4.6.7
Ex:
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:multi_image_picker/multi_image_picker.dart';
void main() => runApp(new MyApp());
class MyApp extends StatefulWidget {
#override
_MyAppState createState() => new _MyAppState();
}
class _MyAppState extends State<MyApp> {
List<Asset> images = List<Asset>();
String _error;
#override
void initState() {
super.initState();
}
Widget buildGridView() {
if (images != null)
return GridView.count(
crossAxisCount: 3,
children: List.generate(images.length, (index) {
Asset asset = images[index];
return AssetThumb(
asset: asset,
width: 300,
height: 300,
);
}),
);
else
return Container(color: Colors.white);
}
Future<void> loadAssets() async {
setState(() {
images = List<Asset>();
});
List<Asset> resultList;
String error;
try {
resultList = await MultiImagePicker.pickImages(
maxImages: 300,
);
} on Exception catch (e) {
error = e.toString();
}
// If the widget was removed from the tree while the asynchronous platform
// message was in flight, we want to discard the reply rather than calling
// setState to update our non-existent appearance.
if (!mounted) return;
setState(() {
images = resultList;
if (error == null) _error = 'No Error Dectected';
});
}
#override
Widget build(BuildContext context) {
return new MaterialApp(
home: new Scaffold(
appBar: new AppBar(
title: const Text('Plugin example app'),
),
body: Column(
children: <Widget>[
Center(child: Text('Error: $_error')),
RaisedButton(
child: Text("Pick images"),
onPressed: loadAssets,
),
Expanded(
child: buildGridView(),
)
],
),
),
);
}
}
Add dependecy of image_picker:
image_picker: ^0.8.4+3
Then make a method for selectImages():
final ImagePicker imagePicker = ImagePicker();
List<XFile>? imageFileList = [];
void selectImages() async {
final List<XFile>? selectedImages = await
imagePicker.pickMultiImage();
if (selectedImages!.isNotEmpty) {
imageFileList!.addAll(selectedImages);
}
print("Image List Length:" + imageFileList!.length.toString());
setState((){});
}
Create a builder for showing selected Images:
return Scaffold(
appBar: AppBar(
title: Text('Multiple Images'),
),
body: SafeArea(
child: Column(
children: [
ElevatedButton(
onPressed: () {
selectImages();
},
child: Text('Select Images'),
),
Expanded(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: GridView.builder(
itemCount: imageFileList!.length,
gridDelegate:
SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 3),
itemBuilder: (BuildContext context, int index) {
return Image.file(File(imageFileList![index].path),
fit: BoxFit.cover,);
}),
),
),
],
),
));
Complete Source code available in github link...
https://github.com/NishaJain24/multi_image_picker
I want to add a simple image over an image from the gallery/camera. The behavior should be like it.
Open the application, choose a photo or make one with the floating buttons, then show the image and over put our logo on the bottom left. All it is working now.
Then I would like to save it both images in a single one, but I don't know how this process is called or how to achieve it.
import 'package:share/share.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Image Picker Demo',
home: MyHomePage(title: 'Image Picker Example'),
);
}
}
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 _imageFile;
dynamic _pickImageError;
String _retrieveDataError;
void _onImageButtonPressed(ImageSource source) async {
try {
_imageFile = await ImagePicker.pickImage(source: source);
} catch (e) {
_pickImageError = e;
}
setState(() {});
}
Widget _previewImage() {
final Text retrieveError = _getRetrieveErrorWidget();
if (retrieveError != null) {
return retrieveError;
}
if (_imageFile != null) {
print('La imagen ha sido puesta en la pantalla?');
return Image.file(_imageFile);
} else if (_pickImageError != null) {
return Text(
'Pick image error: $_pickImageError',
textAlign: TextAlign.center,
);
} else {
return const Text(
'You have not yet picked an image.',
textAlign: TextAlign.center,
);
}
}
Future<void> retrieveLostData() async {
final LostDataResponse response = await ImagePicker.retrieveLostData();
if (response.isEmpty) {
return;
}
if (response.file != null) {
setState(() {
_imageFile = response.file;
});
} else {
_retrieveDataError = response.exception.code;
}
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Center(
child: Stack(children: <Widget>[
Container(
color: Colors.amber,
child: Platform.isAndroid
? FutureBuilder<void>(
future: retrieveLostData(),
builder:
(BuildContext context, AsyncSnapshot<void> snapshot) {
switch (snapshot.connectionState) {
case ConnectionState.none:
case ConnectionState.waiting:
return const Text(
'You have not yet picked an image.',
textAlign: TextAlign.center,
);
case ConnectionState.done:
return _previewImage();
default:
if (snapshot.hasError) {
return Text(
'Pick image/video error: ${snapshot.error}}',
textAlign: TextAlign.center,
);
} else {
return const Text(
'You have not yet picked an image.',
textAlign: TextAlign.center,
);
}
}
},
)
: (_previewImage())), //
Positioned(
bottom: 16,
left: 16,
width: 100,
height: 100,
child: Image.network(
'http://father-home.ru/wp-content/uploads/2018/05/cropped-logo8.png'))
]))),
floatingActionButton: Column(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
FloatingActionButton(
onPressed: () {
_onImageButtonPressed(ImageSource.gallery);
},
heroTag: 'image0',
tooltip: 'Pick Image from gallery',
child: const Icon(Icons.photo_library),
),
Padding(
padding: const EdgeInsets.only(top: 16.0),
child: FloatingActionButton(
onPressed: () {
_onImageButtonPressed(ImageSource.camera);
},
heroTag: 'image1',
tooltip: 'Take a Photo',
child: const Icon(Icons.camera_alt),
),
),
Padding(
padding: const EdgeInsets.only(top: 16.0),
child: FloatingActionButton(
onPressed: () {
_onShare();
},
tooltip: 'Share',
child: const Icon(Icons.share),
),
),
],
),
);
}
void _onShare(){
//TODO: save the two images into one and share
}
Text _getRetrieveErrorWidget() {
if (_retrieveDataError != null) {
final Text result = Text(_retrieveDataError);
_retrieveDataError = null;
return result;
}
return null;
}
}
the widget with this code looks like it:
You can use RepaintBoundary widget to export a specific widget to image.
I believe that you will need to work with Bitmap.
Load 2 bitmaps, one is the background, one is your logo.
Apply transformation as you like.
Save output bitmap to file.
Take a look at: https://pub.dev/packages/bitmap
I am trying to display all the phone gallery images myself by reading the external files directory and possibly every image that ends with jpg or png. I achieved that, but could not display all of them in a grid as due to their sizes or the no. of images, the app crashes. Code looks bit like this..
new GridView.count(
shrinkWrap: true,
physics: new ClampingScrollPhysics(),
crossAxisCount: 2,
// children: new List<Widget>.generate(_images.length, (index) {
// children: new List<Widget>.generate(allImages.length, (index) {
children: new List<Widget>.generate(_PhoneImages.length, (index) {
File imgFile = _phoneImageFiles[index];
thumbBytes = _phoneThumbBytes[index]; // assuming it got created!!!
// print('thumbbytes $thumbBytes');
print('phone image index: $index');
return new GridTile(
child: new GestureDetector(
child: new Stack(
children: [
new Card(
// color: Colors.blue.shade200,
color: Colors.white70,
child: new Center(
// child: new Text('tile $index'),
// child: new Image.asset(_images[index]),
/*
child: new CachedNetworkImage(
imageUrl: allImages[index].path,
// placeholder: new CircularProgressIndicator(),
errorWidget: new Icon(Icons.error),
)
*/
child: new Image.file(imgFile,
// child: new Image.memory(thumbBytes,
So I tried the imageresize library which tells me to do a heavy operation of resizing, that takes almost 20 minutes before I can show the thumbnails.
All I need is to read thumbnails from gallery like how the phone gallery displays. I don't need categorization. I need all and a link to their full version so that I can do something with them later on.
I think this might help multi_image_picker
e.g
import 'package:flutter/material.dart';
import 'package:multi_image_picker/asset.dart';
class AssetView extends StatefulWidget {
final int _index;
final Asset _asset;
AssetView(this._index, this._asset);
#override
State<StatefulWidget> createState() => AssetState(this._index, this._asset);
}
class AssetState extends State<AssetView> {
int _index = 0;
Asset _asset;
AssetState(this._index, this._asset);
#override
void initState() {
super.initState();
_loadImage();
}
void _loadImage() async {
await this._asset.requestThumbnail(300, 300); // here requesting thumbnail
setState(() {});
}
#override
Widget build(BuildContext context) {
if (null != this._asset.thumbData) {
return Image.memory(
this._asset.thumbData.buffer.asUint8List(),
fit: BoxFit.cover,
);
}
return Text(
'${this._index}',
style: Theme.of(context).textTheme.headline,
);
}
}
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter/services.dart';
import 'package:multi_image_picker/asset.dart';
import 'package:multi_image_picker/multi_image_picker.dart';
import 'asset_view.dart';
void main() => runApp(new MyApp());
class MyApp extends StatefulWidget {
#override
_MyAppState createState() => new _MyAppState();
}
class _MyAppState extends State<MyApp> {
List<Asset> images = List<Asset>();
String _error;
#override
void initState() {
super.initState();
}
Widget buildGridView() {
return GridView.count(
crossAxisCount: 3,
children: List.generate(images.length, (index) {
return AssetView(index, images[index]);
}),
);
}
Future<void> loadAssets() async {
setState(() {
images = List<Asset>();
});
List resultList;
String error;
try {
resultList = await MultiImagePicker.pickImages(
maxImages: 300,
);
} on PlatformException catch (e) {
error = e.message;
}
// If the widget was removed from the tree while the asynchronous platform
// message was in flight, we want to discard the reply rather than calling
// setState to update our non-existent appearance.
if (!mounted) return;
setState(() {
images = resultList;
if (error == null) _error = 'No Error Dectected';
});
}
#override
Widget build(BuildContext context) {
return new MaterialApp(
home: new Scaffold(
appBar: new AppBar(
title: const Text('Plugin example app'),
),
body: Column(
children: <Widget>[
Center(child: Text('Error: $_error')),
RaisedButton(
child: Text("Pick images"),
onPressed: loadAssets,
),
Expanded(
child: buildGridView(),
)
],
),
),
);
}
}