mirror of
https://github.com/flutter/flutter
synced 2024-10-13 19:52:53 +00:00
85 lines
2.3 KiB
Dart
85 lines
2.3 KiB
Dart
// Copyright 2017 The Chromium Authors. 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 'dart:async';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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class PlatformChannel extends StatefulWidget {
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@override
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_PlatformChannelState createState() => new _PlatformChannelState();
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}
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class _PlatformChannelState extends State<PlatformChannel> {
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static const MethodChannel methodChannel =
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const MethodChannel('samples.flutter.io/battery');
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static const EventChannel eventChannel =
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const EventChannel('samples.flutter.io/charging');
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String _batteryLevel = 'Battery level: unknown.';
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String _chargingStatus = 'Battery status: unknown.';
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Future<Null> _getBatteryLevel() async {
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String batteryLevel;
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try {
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final int result = await methodChannel.invokeMethod('getBatteryLevel');
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batteryLevel = 'Battery level: $result%.';
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} on PlatformException {
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batteryLevel = 'Failed to get battery level.';
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}
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setState(() {
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_batteryLevel = batteryLevel;
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});
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}
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@override
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void initState() {
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super.initState();
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eventChannel.receiveBroadcastStream().listen(_onEvent, onError: _onError);
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}
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void _onEvent(String event) {
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setState(() {
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_chargingStatus =
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"Battery status: ${event == 'charging' ? '' : 'dis'}charging.";
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});
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}
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void _onError(PlatformException error) {
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setState(() {
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_chargingStatus = 'Battery status: unknown.';
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});
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}
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@override
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Widget build(BuildContext context) {
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return new Material(
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child: new Column(
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mainAxisAlignment: MainAxisAlignment.spaceEvenly,
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children: <Widget>[
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new Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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new Text(_batteryLevel, key: const Key('Battery level label')),
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new Padding(
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padding: const EdgeInsets.all(16.0),
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child: new RaisedButton(
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child: const Text('Refresh'),
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onPressed: _getBatteryLevel,
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),
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),
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],
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),
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new Text(_chargingStatus),
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],
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),
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);
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}
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}
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void main() {
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runApp(new MaterialApp(home: new PlatformChannel()));
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}
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