Flutter 与原生交互（Android），关于Android开发的面试经验总结

接收

void receiveMessage(){

messageChannel.setMessageHandler((message) async{

print(message);

return “is ok”;

});

}

MethodChannel

=============

flutter 调用原生

1.实现插件

public class FlutterPluginTest implements MethodChannel.MethodCallHandler {

private static final String TAG = “FlutterPluginTest”;

/**

插件标识

public static String CHANNEL = “com.mmd.flutterapp/plugin”;

private static String ACTION_LOG = “log”;

private static String LOG_ARGUMENT = “data”;

static MethodChannel channel;

public static void registerWith(PluginRegistry.Registrar registrar) {

channel = new MethodChannel(registrar.messenger(), CHANNEL);

FlutterPluginTest instance = new FlutterPluginTest();

channel.setMethodCallHandler(instance);

}

@Override

public void onMethodCall(MethodCall methodCall, MethodChannel.Result result) {

/**

通过 method 判断调用方法

if (methodCall.method.equals(ACTION_LOG)) {

/**

解析参数

String text = methodCall.argument(LOG_ARGUMENT);

if (TextUtils.isEmpty(text)) {

/**

错误返回

result.error(“Data is Null”,null,null);

}else {

Log.d(TAG, "onMethodCall: "+text);

/**

成功返回

result.success(“is ok”);

}

}else {

result.notImplemented();

}

2.注册插件

public class MainActivity extends FlutterActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

/**

注册插件

FlutterPluginTest.registerWith(this.registrarFor(FlutterPluginTest.CHANNEL));

}

3.Flutter 端调用

import ‘package:flutter/services.dart’;

/**

名称要和Java端一致

const channelName = “com.mmd.flutterapp/plugin”;

const methodName = “log”;

const MethodChannel channel = MethodChannel(ch

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annelName);

Future _testLog() async{

Map<String,String> map = {“data”:“Flutter Hello !”};

String result = await channel.invokeMethod(methodName,map);

print(result);

}

EventChannel

============

原生发送数据到Flutter

1.实现插件

public class FlutterPluginEventTest implements EventChannel.StreamHandler {

private static final String TAG = “FlutterPluginEventTest”;

public static String CHANNEL = “com.mmd.flutterapp/plugin”;

static EventChannel channel;

public static void registerWith(PluginRegistry.Registrar registrar) {

channel = new EventChannel(registrar.messenger(), CHANNEL);

FlutterPluginEventTest flutterPluginEventTest = new FlutterPluginEventTest();

channel.setStreamHandler(flutterPluginEventTest);

}

@Override

public void onListen(Object o, EventChannel.EventSink eventSink) {

new Thread(new Runnable() {

@Override

public void run() {

while (true) {

try {

Thread.sleep(1000);

eventSink.success(System.currentTimeMillis());

} catch (InterruptedException e) {

eventSink.error(“error”,“error”,e.getMessage());

}

}).start();

}

@Override

public void onCancel(Object o) {

Log.i(TAG, "onCancel: "+o);

}

2.注册插件

FlutterPluginEventTest.registerWith(this.registrarFor(FlutterPluginEventTest.CHANNEL));

3.Flutter 接收

import ‘dart:async’;

import ‘package:flutter/services.dart’;

/**

名称要和Java端一致

const channelName = “com.mmd.flutterapp/plugin”;

const EventChannel eventChannel = EventChannel(channelName);

StreamSubscription _subcription = null;

void init(void onEvent(String value),Function onError){

if(_subcription == null) {

_subcription = eventChannel.receiveBroadcastStream().listen(onEvent,onError: onError);

}

void dispose(){