1 怎么实现发送和接收事件
理论上封装了Android原生广播的代码,需要注册和反注册,这里用DeviceEventEmitter实现
//增加监听
DeviceEventEmitter.addListener
//取消监听
//this.emitter.remove();
这里可也可以通过安卓原生向页面js发送消息,可以参考我的这篇博客
React Native之Android原生通过DeviceEventEmitter发送消息给js
今天还发现
const {navigate} = this.props;等价于
let navigate = this.props.navigate;
2 测试代码
import React from 'react';
import {View, Text} from 'react-native';
import {DeviceEventEmitter} from "react-native";export default class App extends React.Component {constructor(props) {super(props); this.state = {name: '点击我'};}render() {return (<View style={{flex: 1, alignItems: 'center', justifyContent: 'center'}}><TextonPress={() => this._press()}>{this.state.name}</Text></View>);}componentDidMount() {this.emitter = DeviceEventEmitter.addListener("hello", (data) => {console.log("收到通知了:内容是:" + data);this.setState({name: data});});}_press = () => {DeviceEventEmitter.emit('hello', 'chenyu');}componentWillUnmount() {this.emitter.remove();}
}
3 运行结果
一开始的效果
然后 点击"点击我"效果如下
然后日志打印如下
ReactNativeJS I 收到通知了:内容是:chenyu
