1.初识React-Native项目

'use strict'//使用严格模式
import React,{ Component } from 'react';//导入React的Component组件
import {
    AppRegistry,StyleSheet,Text,View
} from 'react-native';//导入View Text AppRegistry等类

export default class Day0718 extends Component{

    render(){
        return(
            <View>
               <Text >
                   Welcome to React Native!
               </Text>
            </View>
        );
    }
 }
 //render 渲染一个View
 AppRegistry.registerComponent('Day0718',() => Day0718);
 
在app 下面的MainActivity 中
package com.day0718;

import com.facebook.react.ReactActivity;

public class MainActivity extends ReactActivity {

    /**
     * Returns the name of the main component registered from JavaScript.
     * This is used to schedule rendering of the component.
     */
    @Override
    protected String getMainComponentName() {
        return "Day0718";
    }
}

通过ComponentName  来绑定模块到原生Activity 中

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