Duanzi.js

import React, {Component} from 'react';
import {
    Image,
    FlatList,
    StyleSheet,
    Text,
    View,
    ActivityIndicator,
} from "react-native";
import moment from "moment/moment";

let pageNo = 1;//当前第几页
const REQUEST_URL = "http://m2.qiushibaike.com/article/list/text?page=";

/**
 * 段子
 */
export default class Duanzi extends Component {

    static navigationOptions = () => ({
        title: '糗事百科',
        headerStyle: {
            backgroundColor: '#549cf8',
        },
        headerTintColor: '#fff',
    });

    constructor(props) {
        super(props);
        this.state = {
            isLoading: true,
            isRefreshing: false,
            //网络请求状态
            error: false,
            errorInfo: "",
            dataArray: [],
            showFoot: 0, // 控制foot， 0：隐藏footer  1：已加载完成,没有更多数据   2 ：显示加载中
        };
    }

    componentDidMount() {
        this.fetchData(pageNo);
    }

    fetchData(pageNo) {
        fetch(REQUEST_URL + pageNo)
            .then((response) => {
                return response.json();
            })
            .then((responseData) => {
                let data = responseData.items;

                /**
                 * 这里改变dataArray的值是因为防止下拉刷新数据的时候，屏幕闪烁
                 */
                if (this.state.isRefreshing) {
                    this.setState({
                        dataArray:[]
                    })
                }

                let foot = 0;
                if (data.length === 0) {
                    foot = 1;
                }
                this.setState({
                    //复制数据源
                    dataArray: this.state.dataArray.concat(data),
                    showFoot: foot,
                    isLoading: false,
                    isRefreshing: false,
                });
                data = null;
            })
            .catch((error) => {
                console.log(error)
            });
    }

    render() {
        if (this.state.isLoading) {
            return this.renderLoadingView();
        }
        return (
            <FlatList
                data={this.state.dataArray}
                renderItem={this.renderData.bind(this)}
                ListFooterComponent={this._renderFooter.bind(this)}
                onEndReached={this._onEndReached.bind(this)}
                onRefresh={this._onRefresh.bind(this)}
                refreshing={this.state.isRefreshing}
                ItemSeparatorComponent={ItemDivideComponent}
                onEndReachedThreshold={0.1}
                keyExtractor={item => item.id}
            />
        );
    }

    renderLoadingView() {
        return (
            <View style={styles.loading}>
                <ActivityIndicator
                    animating={true}
                    color='#549cf8'
                    size="large"
                />
            </View>
        );
    }

    renderData({item}) {
        return (
            <View style={styles.container}>
                <View>
                    <Image source={{uri: item.user != null ? item.user.medium : ""}} style={styles.image}/>
                </View>
                <View style={styles.content}>
                    <Text style={styles.author}>{item.user != null ? item.user.login : "无名"}</Text>
                    <Text style={styles.authorTime}>{moment(item.published_at * 1000).format('YYYY-MM-DD HH:mm:ss')}</Text>
                    <Text style={{margin: 5}}>{item.content}</Text>
                </View>
            </View>
        );
    }

    _renderFooter() {
        if (this.state.showFoot === 1) {
            return (
                <View style={styles.noMoreData}>
                    <Text>没有更多数据了</Text>
                </View>
            );
        } else if (this.state.showFoot === 2) {
            return (
                <View style={styles.footer}>
                    <ActivityIndicator animating={true}
                                       color='#549cf8'
                                       size="small"/>
                    <Text>正在加载更多数据...</Text>
                </View>
            );
        } else if (this.state.showFoot === 0) {
            return (
                <View style={styles.footer}>
                    <Text></Text>
                </View>
            );
        }
    }

    _onEndReached() {
        //如果是正在加载中或没有更多数据了，则返回
        if (this.state.showFoot !== 0) {
            return;
        }
        pageNo++;
        this.setState({
            showFoot: 2,
        });
        //获取数据
        this.fetchData(pageNo);
    }

    _onRefresh() {
        this.setState({
            isRefreshing:true,
        });
        pageNo = 1;
        this.fetchData(pageNo);
    }
}

class ItemDivideComponent extends Component {
    render() {
        return (
            <View style={{height: 1, backgroundColor: '#549cf8'}}/>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        flexDirection: 'row',
    },
    content: {
        flex: 1,
        flexDirection: 'column',
    },
    loading: {
        flex: 1,
        flexDirection: 'column',
        justifyContent: 'center',
        alignItems: 'center'
    },
    image: {
        margin:10,
        alignItems:'center',
        justifyContent:'center',
        width: 60,
        height:60,
        backgroundColor:'#549cf8',
        borderColor:'green',
        borderStyle:'solid',
        borderRadius:50,
        paddingBottom:2
    },
    authorTime: {
        marginLeft: 8,
        color: 'gray',
        fontSize: 10,
    },
    author: {
        margin: 8,
        color: 'gray',
        fontSize: 16,
    },
    footer: {
        flexDirection: 'row',
        height: 24,
        justifyContent: 'center',
        alignItems: 'center',
        marginTop: 10,
        marginBottom: 10,
    },
    noMoreData: {
        flexDirection: 'row',
        height: 30,
        justifyContent: 'center',
        alignItems: 'center',
        marginTop: 10,
        marginBottom: 10,
        color: '#999999',
        fontSize: 14
    },
});