1.前语
在文章Flutter结构分析（八）-Platform Channel中，我们分析了BasicMessageChannel的原理和结构java怎样读，并详细说明了与其相关的一些中心类，例如MessageHandler和MessageCodec等，本文首要说明运用BasicMessageChannel的示例。
2.运用流程
BasicMessageChannel可用于Flutter给native发音讯，也可用于native给Flutter发音讯，所以接下来将别离分析这两种运用流程。
2.1 Flutter给android是什么手机牌子native发音讯
流程如下：
1）native端创立某flutter是什么意思channel naandroid手机me的BasicMessFlutterageChannel。android平板电脑价格
2）native端运用setMessageHandler函数，设置该Basjson文件是干什么的icMessageChannel的MessageHandler。
3）Flutjsonter端创立该channel name的BasicMesflutter是什么意思sageChannel。
4）Flutter端android手机运用该BasicMessageChannel经过senandroid平板电脑价格d函数向native端发送音讯。
5）natijava怎样读ve端刚刚注册的MessageHandler收到发送的音讯，在onMessage中处理音讯，经过reply函数进行回复。
6）Flutter端处理该回复。
Flutter端要害代码如下：
class_MessageChanjava工作培训班nelStateextendsState<MessageChannelWidget> {
static const _cflutter中文官网hannel =BasicMessageChannel('flutter2/testmessagechannejson格局l',JSONMessageCodec());
inti=0;
void_sendMessage()asyjsonnc{
fiappearnalString reply=await _cjava言语hannjsonpel.sjsonpend(android体系'android手机Hjava难学吗ello World i:$i');
print('MessageChannelTestandroid电子市场 in dart$reply');
setState(() {
i++;
});
}
@override
Widgetbuild(java初学BuildContappreciateextcontext) {
rflutter言语eturnScaffold(
appBar:AppBar(
title:Text("message channel tflutter值得学吗est"),flutter框架
),
bojava初学dy:Center(
// Center is a layout wiandroid电子市场dget. It takes a single child anjava面试题d positions it
// in theapple middle of the parent.
child:Coluandroid/yunosmn(
mainAxisAlignment:MainAxisAlignment.center,
children: <Widget>[
Text(
'You haveapprove pushedjava怎样读 the button this many times:',
),java模拟器
Text(
'$i',
style:Theme.*of*(context).textTheme.headline4,
),
],
),
),
floatingActijava怎样读onButton:FloatingActionButton(
onPrapp是什么意思essed:_sendMessage,
tooltip:'Increment',
child:Icon(Icons.approveadd),
), // This trailflutter框架优缺点ing comma makes auto-formatting nicer for build meflutter是什么意思thods);
}
}
natjson接口回来过错ive端要害代码如下：
classMessjava工作培训班ageChannjson数据elActivity: FluttapproveerActivity() {
companion object{
funstartActiviJavaty(activity:Activity) {
valintent= Intflutter是什么意思ent(activity,MessageChannelActivity::class.java)
activity.startActivity(intent)
}
}
override funconfigureFlutterEngine(@json格局怎样翻开NonNullflutterEngine:Fluttejava怎样读rEngine) {
Log.d("MessageChannelTest","MessageChapproveannelActivity configureFlutterEngine")
valchannel= BasicMessageChannel(
flutterEngine.dartExecutor.binaryMessenger,
"flutter2/testmessagechannel",
JSONMessageCodec.INSTANCE)
// Rjava初学eceiappreciateve messages from Dart
channel.sandroid是什么手机牌子etMessageHandler {message, repjson接口回来过错ly->
Log.d("MessageChajsonnnelTest","in android Received message =$message")
reply.reply("Reply from Android")
}
}
}
2.2 native给Flutter发音讯
流程如下：
1）Flutter端创立该channel name的BasicMessageChannel。
2）Flutter端运用setMesjson文件是干什么的sageHandler函数，设置该BasicMessageChannel的Handler函数。
3）native端创立某channel name的BasicMessageChannel。
4）native端运用该BasicMessjava难学吗ageChanjava开发nel经过send函数向Flutter端发送音讯。
5）Flutter端刚刚注册的Handler收到发送的音讯，并处理音讯，然后经过reply函数进行回复。java怎样读
6）native端处理该回复。
Flutandroid/yunoster端要害代码如下：
class_MessageChannelStateextendsState<MessageChannelWidget> {
static const _channel =BasicMessjson文件是干什么的ageChannel('fjava模拟器lutter2/flutter是什么意思testmessagechannel',java难学吗JSONMessageCodec());
intijson接口回来过错=0;
void_sendMessage()async{
finalString reply=await _flutter框架channel.send('Hello World i:$i');
print('MessageChannelTest in dart$reply');
setState(() {
i+json格局+;
});
}json
@json字符串override
voidinitState() {
//app是什么意思 Rfluttershyeceive messages from platform
_chappearanceanneAndroidl.setMessageHandler((dynamicmessage)async{
print('MessageChannelandroid下载Test in dart Received messaandroid是什么手机牌子ge =$message');
return'Reply from Dart';
});
super.initState();
}
}
native端要害代码如下：
classMessageChannelActivity: FlutterActivity() {
companion object{android下载安装
funstartActivityflutter值得学吗(activity:Activity) {
valintent= Iflutter言语ntapproveent(activity,MessageChaandroid手机nnelActivity::class.java)
activity.startActivity(intent)
}
}
override funcJSONonfigureFlutterEngine(@NonNullflutterEngine:Fluttejava言语rEngine) {
Log.d("MessflutteringageChannelTest","MessageChannelActivity configureFlutterEngine")
valchannel= BasicMessageChannel(
flutterEngijava言语ne.dartExecutor.binaryMessenger,
"flutter2/testmessagechannel",
JSONMessageCodec.INSTANCE)
// Send message to Dart
Handler().postDelayed(json格局 {
channel.send("Hello World from Android") { reply->
Log.d("MessageChannelTest","in android$reply")
}
},500)
}
}
3. 小结
本文首要介绍了BasicMessageChannel的运用流程，并排举了一个运用BasicMessageChannel的示例。
