Flutter与原生交互

平台通道，消息和响应是异步传递的，以确保用户界面保持响应(不会挂起)

Flutter 代码


import 'package:flutter/services.dart';

...
class _MyHomePageState extends State<MyHomePage> {
  static const platform = const MethodChannel('samples.flutter.io/battery');

  // Get battery level.
  
   String _batteryLevel = 'Unknown battery level.';

  Future<Null> _getBatteryLevel() async {
    String batteryLevel;
    try {
      final int result = await platform.invokeMethod('getBatteryLevel');
      batteryLevel = 'Battery level at $result % .';
    } on PlatformException catch (e) {
      batteryLevel = "Failed to get battery level: '${e.message}'.";
    }

    setState(() {
      _batteryLevel = batteryLevel;
    });
  }
  
  
  @override
Widget build(BuildContext context) {
  return new Material(
    child: new Center(
      child: new Column(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: [
          new RaisedButton(
            child: new Text('Get Battery Level'),
            onPressed: _getBatteryLevel,
          ),
          new Text(_batteryLevel),
        ],
      ),
    ),
  );
  
}


2.iOS代码
#import <Flutter/Flutter.h>

@implementation AppDelegate
- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
  FlutterViewController* controller = (FlutterViewController*)self.window.rootViewController;

  FlutterMethodChannel* batteryChannel = [FlutterMethodChannel
                                          methodChannelWithName:@"samples.flutter.io/battery"
                                          binaryMessenger:controller];

  [batteryChannel setMethodCallHandler:^(FlutterMethodCall* call, FlutterResult result) {
    // TODO
    
    if ([@"getBatteryLevel" isEqualToString:call.method]) {
    int batteryLevel = [self getBatteryLevel];

    if (batteryLevel == -1) {
      result([FlutterError errorWithCode:@"UNAVAILABLE"
                                 message:@"Battery info unavailable"
                                 details:nil]);
    } else {
      result(@(batteryLevel));
    }
  } else {
    result(FlutterMethodNotImplemented);
  }
    
    
  }];

  return [super application:application didFinishLaunchingWithOptions:launchOptions];
}


//获取设备电量方法
- (int)getBatteryLevel {
  UIDevice* device = UIDevice.currentDevice;
  device.batteryMonitoringEnabled = YES;
  if (device.batteryState == UIDeviceBatteryStateUnknown) {
    return -1;
  } else {
    return (int)(device.batteryLevel * 100);
  }
}

参考官网

flutterchina.club/platform-ch…