我正在学习如何连接flutter
和原生安卓。我正在尝试一个有关获取电池电量的示例。以下是我的代码和错误信息,它很简单但无法得到我想要的结果。
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/services.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: 'battery level',
home: MyHomePage(title: 'battery level'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
static const platform = const MethodChannel('samples.fltter.io/battery');
String _batteryLevel = 'Unknow battery level';
Future<Null> getBatteryLevel() async {
String batteryLevel = '';
try {
int res = await platform.invokeMethod('getBatteryLevel');
batteryLevel = 'battery level is: $res';
} on PlatformException catch(e) {
batteryLevel = 'caught an error';
}
setState(() {
_batteryLevel = batteryLevel;
});
print(_batteryLevel);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
children: <Widget>[
RaisedButton(
child: Text('click'),
onPressed: (){getBatteryLevel();},
),
Text(_batteryLevel),
],
),
)
);
}
}
E/flutter (11202): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method getBatteryLevel on channel samples.fltter.io/battery)
E/flutter (11202): #0 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:154:7)
E/flutter (11202): <asynchronous suspension>
E/flutter (11202): #1 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:329:12)
E/flutter (11202): #2 _MyHomePageState._getBatteryLevel (package:batterylevel/main.dart:54:41)
E/flutter (11202): #3 _MyHomePageState.build.<anonymous closure> (package:batterylevel/main.dart:75:29)
E/flutter (11202): #4 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:779:19)
E/flutter (11202): #5 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:862:36)
E/flutter (11202): #6 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)
E/flutter (11202): #7 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:504:11)
E/flutter (11202): #8 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:282:5)
E/flutter (11202): #9 BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:217:7)
E/flutter (11202): #10 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:475:9)
E/flutter (11202): #11 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:76:12)
E/flutter (11202): #12 PointerRouter._dispatchEventToRoutes.<anonymous closure> (package:flutter/src/gestures/pointer_router.dart:122:9)
E/flutter (11202): #13 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:379:8)
E/flutter (11202): #14 PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:120:18)
E/flutter (11202): #15 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:106:7)
E/flutter (11202): #16 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:218:19)
E/flutter (11202): #17 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:198:22)
E/flutter (11202): #18 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:156:7)
E/flutter (11202): #19 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:102:7)
E/flutter (11202): #20 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:86:7)
E/flutter (11202): #21 _rootRunUnary (dart:async/zone.dart:1196:13)
E/flutter (11202): #22 _CustomZone.runUnary (dart:async/zone.dart:1085:19)
E/flutter (11202): #23 _CustomZone.runUnaryGuarded (dart:async/zone.dart:987:7)
E/flutter (11202): #24 _invoke1 (dart:ui/hooks.dart:275:10)
E/flutter (11202): #25 _dispatchPointerDataPacket (dart:ui/hooks.dart:184:5)
getBatteryLevel
方法调用。请上传原生安卓代码片段好吗? - yusufpats