前言
当Android项目集成Flutter项目之后，将两个项目链接起来的核心就是路由通信了。所以在这里记录以下混合开发的路由通信方式，加深印象。
正文
Flutter提供 MethodChannel、EventChannel、BasicMessageChannel 三种方式。
1，类似注册监听，发送的模式 原则 2，使用顺序：先注册，后发送，否则接收不到。尤其使用 MethodChannel、EventChannel 不符合该原则会抛出异常，BasicMessageChannel方式只是收不到消息
MethodChannel
应用场景：Flutter端 调用 Native端
Flutter端代码：
var result = await MethodChannel("com.simple.channelflutterandroid/method",
StandardMethodCodec())
.invokeMethod("toast", {"msg": msg})
Android端代码：
MethodChannel(flutterView, "com.simple.channelflutterandroid/method",
StandardMethodCodec.INSTANCE)
.setMethodCallHandler { methodCall, result ->
when (methodCall.method) {
"toast" -> {
//调用传来的参数"msg"对应的值
val msg = methodCall.argument<String>("msg")
//调用本地Toast的方法
Toast.makeText(cxt, msg, Toast.LENGTH_SHORT).show()
//回调给客户端
result.success("native android toast success")
}
"other" -> {
// ...
}
else -> {
// ...
}
}
}
EventChannel
应用场景：Native端 调用 Flutter端
Flutter端代码：
EventChannel("com.simple.channelflutterandroid/event")
.receiveBroadcastStream()
.listen((event){
print("It is Flutter - receiveBroadcastStream $event");
})
Android端代码：
EventChannel(flutterView, "com.simple.channelflutterandroid/event")
.setStreamHandler(object : EventChannel.StreamHandler {
override fun onListen(o: Any?, eventSink: EventChannel.EventSink) {
eventSink.success("我是发送Native的消息")
}
override fun onCancel(o: Any?) {
// ...
}
})
BasicMessageChannel
应用场景：互相调用 两种使用方式，创建方式和格式不一样
第一种
Flutter端
_basicMessageChannel = BasicMessageChannel("com.simple.channelflutterandroid/basic",
stringCodec())
// 发送消息
_basicMessageChannel.send("我是Flutter发送的消息");
// 接收消息
_basicMessageChannel.setMessageHandler((str){
print("It is Flutter - receive str");
});
Android端
val basicMessageChannel = BasicMessageChannel<String>(flutterView, "com.simple.channelflutterandroid/basic", StringCodec.INSTANCE)
// 发送消息
basicMessageChannel.send("我是Native发送的消息")
// 接收消息
basicMessageChannel.setMessageHandler { o, reply ->
println("It is Native - setMessageHandler $o")
reply.reply("It is reply from native")
}
其中StringCodec()，四种方式可选
第二种
Flutter端
static const BASIC_BINARY_NAME = "com.simple.channelflutterandroid/basic/binary";
// 发送消息
val res = await BinaryMessages.send(BASIC_BINARY_NAME, ByteData(256))
// 接收消息
BinaryMessages.setMessageHandler(BASIC_BINARY_NAME, (byteData){
println("It is Flutter - setMessageHandler $byteData")
});
Android端
const val BASIC_BINARY_NAME = "com.simple.channelflutterandroid/basic/binary"
// 发送消息
flutterView.send(BASIC_BINARY_NAME,ByteBuffer.allocate(256));
// 接收消息
flutterView.setMessageHandler(BASIC_BINARY_NAME) { byteBuffer, binaryReply ->
println("It is Native - setMessageHandler $byteBuffer")
binaryReply.reply(ByteBuffer.allocate(256))
}
