React-Native与原生通信之Android调用RN

一个把终身献给代码的单身狗，寻找自由之路
刚写完iOS调用RN端代码的，现在写Android调用RN端代码的，只有一种方法

1、建立继承与MJToRNBridgeModulesTest类

package com.gomejr.icash.business.rn.MJRNComponment;

import com.facebook.react.bridge.ReactContext;
import com.facebook.react.bridge.WritableMap;
import com.facebook.react.modules.core.DeviceEventManagerModule;

import javax.annotation.Nullable;

public class MJToRNBridgeModulesTest extends Object {

    private final ReactContext reactContext;

    public MJToRNBridgeModulesTest(ReactContext reactContext) {
        super();
        this.reactContext = reactContext;
    }

    public void refreshFinancialLifePage(String eventName, @Nullable WritableMap params) {
        if (this.reactContext == null) {
            return;
        }
        this.reactContext.getJSModule((DeviceEventManagerModule.RCTDeviceEventEmitter.class)).emit(eventName, params);
    }
}

2、在需要调用的地方，实例化MJToRNBridgeModulesTest类，并把reactContext传给MJToRNBridgeModulesTest的实例

WritableMap params = Arguments.createMap();
        MJToRNBridgeModulesTest module = new MJToRNBridgeModulesTest(getReactContext());
        module.refreshFinancialLifePage(eventName, params);

获取reactContext的方法如下，首先获取到mReactInstanceManager

    private ReactContext reactContext;
    private ReactInstanceManager mReactInstanceManager;

private ReactContext getReactContext() {
        return reactContext != null ? reactContext : mReactInstanceManager != null ? mReactInstanceManager.getCurrentReactContext() : null;
    }

3、对应的RN代码如下
建立EventManager.js文件

import React, {
    DeviceEventEmitter
}from 'react-native';
export default class EventManager{
    subscription = null; //监听者

    /**
     * @param eventType  监听的名称，用来区分监听，String类型
     * @param callback      监听的回调，需要监听的方法
     */
    init = (eventType,callback) =>{
        subscription = DeviceEventEmitter.addListener(eventType,() => {
                callback();
            });
    }

    /**
     * 销毁监听
     */
    destroy=()=>{
        if (this.subscription != null) {
                subscription.remove();
        }
    }
}

在需要的组件内

 componentDidMount() {
         this.eventManager = new EventManager();//创建
         this.eventManager.init(‘'eventName', this._onHeaderRefresh);//注册事件
    }