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## Pre-launch Checklist - [x] I read the [Flutter Style Guide] _recently_, and have followed its advice. - [x] I signed the [CLA]. - [x] I read the [Contributors Guide]. - [x] I updated/added relevant documentation (doc comments with `///`). - [ ] All existing and new tests are passing. --------- Co-authored-by: David Iglesias <ditman@gmail.com> Co-authored-by: Mark Thompson <2554588+MarkTechson@users.noreply.github.com> Co-authored-by: John Ryan <ryjohn@google.com>
52 lines
2.0 KiB
Dart
52 lines
2.0 KiB
Dart
// Copyright 2020 The Flutter team. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:platform_channels/src/accelerometer_event_channel.dart';
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/// Demonstrates how to use [EventChannel] to listen continuous values
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/// of Accelerometer Sensor from platform.
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///
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/// The widget uses a [StreamBuilder] to rebuild it's descendant whenever it
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/// listens a new value from the [Accelerometer.readings] stream. It has three
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/// [Text] widgets to display the value of [AccelerometerReadings.x],
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/// [AccelerometerReadings.y], and [AccelerometerReadings.z] respectively.
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class EventChannelDemo extends StatelessWidget {
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const EventChannelDemo({super.key});
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@override
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Widget build(BuildContext context) {
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final textStyle = Theme.of(context).textTheme.headlineSmall;
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return Scaffold(
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appBar: AppBar(
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title: const Text('EventChannel Demo'),
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),
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body: Center(
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child: StreamBuilder<AccelerometerReadings>(
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stream: Accelerometer.readings,
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builder: (context, snapshot) {
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return switch (snapshot) {
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AsyncSnapshot(hasError: true) =>
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Text((snapshot.error as PlatformException).message!),
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AsyncSnapshot(hasData: true) => Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Text('x axis: ${snapshot.data!.x.toStringAsFixed(3)}',
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style: textStyle),
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Text('y axis: ${snapshot.data!.y.toStringAsFixed(3)}',
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style: textStyle),
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Text('z axis: ${snapshot.data!.z.toStringAsFixed(3)}',
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style: textStyle)
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],
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),
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_ => Text('No Data Available', style: textStyle),
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};
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},
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),
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),
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);
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}
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}
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