Трептене на потребителския интерфейс за качване на изображения
Примерен код
зареждане в хранилището firebase flutter
Future<String> uploadFile(File _image) async { StorageReference storageReference = FirebaseStorage.instance .ref() .child('sightings/${Path.basename(_image.path)}'); StorageUploadTask uploadTask = storageReference.putFile(_image); await uploadTask.onComplete; print('File Uploaded'); String returnURL; await storageReference.getDownloadURL().then((fileURL) { returnURL = fileURL; }); return returnURL;}потребителски интерфейс flutter зарежда няколко изображения
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 = 'Selectionner une image';
@override
void initState() {
super.initState();
}
Widget buildGridView() {
return GridView.count(
crossAxisCount: 3,
children: List.generate(images.length, (index) {
Asset asset = images[index];
return AssetThumb(
asset: asset,
width: 300,
height: 300,
);
}),
);
}
Future<void> loadAssets() async {
List<Asset> resultList = List<Asset>();
String error = 'No Error Dectected';
try {
resultList = await MultiImagePicker.pickImages(
maxImages: 4,
enableCamera: true,
selectedAssets: images,
cupertinoOptions: CupertinoOptions(takePhotoIcon: "chat"),
materialOptions: MaterialOptions(
actionBarColor: "#abcdef",
actionBarTitle: "Example App",
allViewTitle: "All Photos",
useDetailsView: false,
selectCircleStrokeColor: "#000000",
),
);
} 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;
_error = error;
});
}
@override
Widget build(BuildContext context) {
return new MaterialApp(
home: new Scaffold(
appBar: new AppBar(
title: const Text('Image Upload'),
centerTitle: true,
),
body: Column(
children: <Widget>[
//Center(child: Text('Error: $_error')),
Text('Ajouter image du produit'),
RaisedButton(
child: Text("Selectionner "),
onPressed: loadAssets,
),
Expanded(
child: buildGridView(),
)
],
),
),
);
}
}Подобни страници
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