class BasicMessageChannelDemo(messenger: BinaryMessenger) : BasicMessageChannel.MessageHandler {
private var channel: BasicMessageChannel
init {
channel = BasicMessageChannel(messenger, “com.example.androidflutter.BasicMessageChannelDemo”, StandardMessageCodec())
channel.setMessageHandler(this)
}
override fun onMessage(message: Any?, reply: BasicMessageChannel.Reply) {
val name = (message as Map<
String, Any>)[“name”]
val age = (message as Map
var map = mapOf(“name” to “hello,$name”,
“age” to “$age”
)
reply.reply(map)
}
}
2.3 调用处class MainActivity : FlutterActivity() {
override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
super.configureFlutterEngine(flutterEngine)
BasicMessageChannelDemo(flutterEngine.dartExecutor.binaryMessenger)
}
}
2.4 效果图三 原生端主动发送消息给Flutter
3.1 Flutter端
void main() => runApp(BasicMessageChannelDemo());
class BasicMessageChannelDemo extends StatefulWidget {
@override
_BasicMessageChannelDemoState createState() => _BasicMessageChannelDemoState();
}
class _BasicMessageChannelDemoState extends State {
var channel = BasicMessageChannel(‘com.example.androidflutter.BasicMessageChannelDemo’,StandardMessageCodec());
var _data;
var _nativeData;
@override
void initState() {
super.initState();
channel.setMessageHandler((message) async {
setState(() {
_nativeData = (message as Map)[‘count’];
});
});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: Text(“Flutter BasicMessageChannel”)),
body: Column(
children: [
SizedBox(height: 50),
RaisedButton(
child: Text(‘发送数据到原生’),
onPressed: () async {
var result = await channel.send({‘name’: ‘张三’, ‘age’: 18}) as Map;
var name = result[‘name’];
var age = result[‘age’];
setState(() {
_data = ‘ n a m e , name, name,age’;
});
},
),
Text(‘原生返回数据：$_data’),
Text(‘原生主动发送数据：$_nativeData’)
],
),
),
);
}
}
3.2 Android端class BasicMessageChannelDemo(var activity: Activity, messenger: BinaryMessenger) : BasicMessageChannel.MessageHandler {
private var channel: BasicMessageChannel
private var count = 0
init {
channel = BasicMessageChannel(messenger, “com.example.androidflutter.BasicMessageChannelDemo”, StandardMessageCodec())
channel.setMessageHandler(this)
startTimer()
}
fun startTimer() {
var timer = Timer().schedule(timerTask {
activity.runonUiThread {
var map = mapOf(“count” to count++)
channel.send(map,object :BasicMessageChannel.Reply{
override fun reply(reply: Any?) {
}
})
}
}, 0, 1000)
}
override fun onMessage(message: Any?, reply: BasicMessageChannel.Reply) {
map = mapOf(“count” to count++)
channel.send(map,object :BasicMessageChannel.Reply{
override fun reply(reply: Any?) {
}
})
}
}, 0, 1000)
}
override fun onMessage(message: Any?, reply: BasicMessageChannel.Reply) {
