Flutter与Android通信的三种方式


一、 MethodChannel
主要是flutter端调用android方法。android调取flutter方法网上有一个博客说是可以，但是没找到相关的代码资料。MethodChannel通信方式我之前写过，可以查看如下链接，https://www.jianshu.com/p/6b677ff3350e

二、 BasicMessageChannel
它是可以双端通信的，flutter端可以给Android发送消息，Android也可以给Flutter发送消息。

  • Flutter 端创建一个通道
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 static var basicChannel = const BasicMessageChannel("com.flutter.guide.MyFlutterView", StandardMessageCodec());
  • Flutter端发送消息,并接收返回数据resullt
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 result =  await basicChannel.send({'name':'azy','age' : 19});

  • Android 端创建相同通道，并接收消息和发送消息
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 var basicMessageChannel = BasicMessageChannel(messager, "com.flutter.guide.MyFlutterView", StandardMessageCodec())
        basicMessageChannel.setMessageHandler { message, reply ->
            var map = message as Map<String, Any>
            text.text = "原生的textvieww : ${map["name"]}, ${map["age"]}"
            //被动回复 flutter 消息
          reply.reply("I get it")
            //主动给 flutter 发消息
            basicMessageChannel.send("我还可以主动告诉你，我是个男的")
        }
  • Flutter 端接收Android端主动发送的消息
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basicChannel.setMessageHandler((message) async {
     this.message = message;
   });

三、EventChannel
只能是原生发送消息给Flutter端，例如监听手机电量变化，网络变化，传感器等。

  • Android 创建通道并发送消息
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 EventChannel(messager,"com.flutter.guide.MyFlutterView").setStreamHandler(object : EventChannel.StreamHandler{
                override fun onListen(arguments: Any?, events: EventChannel.EventSink?) {
                    for (i in 0 .. 10){
                        events?.success(i)
                    }
                    events?.endOfStream()
                }

                override fun onCancel(arguments: Any?) {

                }

            })
  • Flutter 端创建通道
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 static var eventChannel = const EventChannel("com.flutter.guide.MyFlutterView");

  • Flutter端监听返回消息
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   eventChannel.receiveBroadcastStream().listen((event) {
      print("event "+event.toString());
    },onDone: (){
      print("done");
    },onError: (object){
      print("on error $object");
    });

打印结果如下：

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2020-10-08 16:12:29.578 14515-14594/com.example.flutter_demo I/flutter: event 0
2020-10-08 16:12:29.578 14515-14594/com.example.flutter_demo I/flutter: event 1
2020-10-08 16:12:29.578 14515-14594/com.example.flutter_demo I/flutter: event 2
2020-10-08 16:12:29.578 14515-14594/com.example.flutter_demo I/flutter: event 3
2020-10-08 16:12:29.579 14515-14594/com.example.flutter_demo I/flutter: event 4
2020-10-08 16:12:29.579 14515-14594/com.example.flutter_demo I/flutter: event 5
2020-10-08 16:12:29.579 14515-14594/com.example.flutter_demo I/flutter: event 6
2020-10-08 16:12:29.579 14515-14594/com.example.flutter_demo I/flutter: event 7
2020-10-08 16:12:29.579 14515-14594/com.example.flutter_demo I/flutter: event 8
2020-10-08 16:12:29.579 14515-14594/com.example.flutter_demo I/flutter: event 9
2020-10-08 16:12:29.580 14515-14594/com.example.flutter_demo I/flutter: event 10
2020-10-08 16:12:29.570 14515-14515/com.example.flutter_demo W/1.raster: type=1400 audit(0.0:2234682): avc: denied { read } for name="u:object_r:vendor_default_prop:s0" dev="tmpfs" ino=22601 scontext=u:r:untrusted_app:s0:c129,c256,c512,c768 tcontext=u:object_r:vendor_default_prop:s0 tclass=file permissive=0
2020-10-08 16:12:29.580 14515-14595/com.example.flutter_demo E/libc: Access denied finding property "vendor.debug.egl.swapinterval"
2020-10-08 16:12:29.580 14515-14594/com.example.flutter_demo I/flutter: done

总结一下：
MethodChannel是flutter调取原生方法的。
BasicMessageChannel是两个端相互发送数据，接收数据的。
EventChannel 是android频繁发送数据给Flutter端的。