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platform_image_demo.dart
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platform_image_demo.dart
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// Copyright 2020 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:platform_channels/src/image_basic_message_channel.dart';
/// Demonstrates how to use [BasicMessageChannel] to get an image from platform.
///
/// The widget uses [Image.memory] to display the image obtained from the
/// platform.
class PlatformImageDemo extends StatefulWidget {
@override
_PlatformImageDemoState createState() => _PlatformImageDemoState();
}
class _PlatformImageDemoState extends State<PlatformImageDemo> {
Future<Uint8List> imageData;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Platform Image Demo'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Flexible(
child: FractionallySizedBox(
widthFactor: 1,
heightFactor: 0.6,
child: FutureBuilder<Uint8List>(
future: imageData,
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.none) {
return Placeholder();
} else if (snapshot.hasError) {
return Center(
child: Text(snapshot.error.toString()),
);
} else if (snapshot.connectionState ==
ConnectionState.done) {
return Image.memory(
snapshot.data,
fit: BoxFit.fill,
);
}
return CircularProgressIndicator();
},
),
),
),
SizedBox(
height: 16,
),
ElevatedButton(
onPressed: imageData != null
? null
: () {
setState(() {
imageData = PlatformImageFetcher.getImage();
});
},
child: Text('Get Image'),
)
],
),
),
);
}
}