React native 入门二 魅力展示

打下面代码copy至index.os.js 和index.android.js

import React, {
    Component,
} from 'react';
import {
    AppRegistry,
    Image,
    ListView,
    StyleSheet,
    Text,
    View,
} from 'react-native';

var REQUEST_URL = 'https://raw.githubusercontent.com/facebook/react-native/master/docs/MoviesExample.json';


class AwesomeProject extends Component
{
    constructor(props) {
        super(props);
        this.state = {
        dataSource: new ListView.DataSource({
                                            rowHasChanged: (row1, row2) => row1 !== row2,
                                            }),
        loaded: false,
        };
    }

    componentDidMount(){
        this.fetchData();
    }

    fetchData() {
        fetch(REQUEST_URL)
        .then((response) => response.json())
        .then((responseData) => {
              this.setState({
                            dataSource: this.state.dataSource.cloneWithRows(responseData.movies),
                            loaded: true,
                            });
              })
        .done();
    }

    render() {
        if (!this.state.loaded) {
            return this.renderLoadingView();
        }

        return (
                <ListView
                dataSource={this.state.dataSource}
                renderRow={this.renderMovie}
                style={styles.listView}
                />
                );
    }

    renderLoadingView()
    {
        return (<View style={styles.container} >
                <Text>Loading movies......</Text>
                </View>

                );
    }

    renderMovie(movie) {
        return (
                <View style={styles.container}>
                <Image
                source={{uri: movie.posters.thumbnail}}
                style={styles.thumbnail}
                />
                <View style={styles.rightContainer}>
                <Text style={styles.title}>{movie.title}</Text>
                <Text style={styles.year}>{movie.year}</Text>
                </View>
                </View>
                );
    }


};


var styles = StyleSheet.create({
                               container: {
                               flex: 1,
                               flexDirection: 'row',
                               justifyContent: 'center',
                               alignItems: 'center',
                               backgroundColor: '#F5FCFF',
                               },
                               rightContainer: {
                               flex: 1,
                               },
                               title: {
                               fontSize: 20,
                               marginBottom: 8,
                               textAlign: 'center',
                               },
                               year: {
                               textAlign: 'center',
                               },
                               thumbnail: {
                               width: 53,
                               height: 81,
                               },
                               listView: {
                               paddingTop: 20,
                               backgroundColor: '#F5FCFF',
                               },
                               });
AppRegistry.registerComponent('AwesomeProject', () => AwesomeProject);
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然后分别真机运行android和iOS项目即可

如果正常就可以看到运行结果

android可能遇见的问题 
红屏问题”Could not get BatchedBridge, make sure your bundle is packaged correctly” 
解决方法: 主要就只遇到这一个问题, 更改ip和port没有解决了, 后来在package.json中的”scripts”中添加”bundle-android”:”react-native bundle –platform android –dev false –entry-file index.android.js –bundle-output android/app/src/main/assets/index.android.bundle –sourcemap-output android/app/src/main/assets/index.android.map –assets-dest android/app/src/main/res/”, 
如果没有assets目录,手动添加下,不过运行时没有效果, 
在cmd中手动执行下, assets目录中会多出几个文件, 即可解决这个问题