Flutter和原生交互---EventChannel

最新推荐文章于 2025-09-11 14:09:18 发布

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最新推荐文章于 2025-09-11 14:09:18 发布 · 1.4w 阅读

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本文介绍了如何使用Flutter的EventChannel在Android原生代码和Flutter之间进行事件通信。通过创建一个单例类实现EventChannel，监听Android的重力感应等状态变化，并将这些事件通知给Flutter端，实现原生与Flutter的一对多广播通知功能。在Flutter应用的MainActivity中注册通信类，并在Flutter端订阅事件通道，接收到事件后打印输出。

EventChannel，用于Android原生事件流向Flutter端的发送，例如通过原生监听重力感应等状态变化后向Flutter发送通知，一对多通知，类似于原生广播

原生端实现代码：

1.实现EventChannel：单例类，通过sendEventData通知Flutter

package com.example.flutter_event_channel_plugin;

import android.util.Log;

import androidx.annotation.NonNull;

import io.flutter.embedding.engine.plugins.FlutterPlugin;
import io.flutter.plugin.common.EventChannel;

public class FlutterEventChannel implements FlutterPlugin, EventChannel.StreamHandler {
    public static final String CHANNEL_NAME = "event_channel_name";
    private EventChannel eventChannel;
    private EventChannel.EventSink eventSink;

    private static volatile FlutterEventChannel instance;

    private FlutterEventChannel () {
    }

    public static FlutterEventChannel getInstance() {
        if (instance == null) {
            synchronized (FlutterEventChannel .class) {
                if (instance == null) {
                    instance = new FlutterEventChannel ()