ReactNative-请求数据和列表展示

1.实现样式：点击按钮加载数据，数据加载完毕显示返回的数据并以列表显示。

如下：

2.实例：

import React, {Component} from 'react';
import {
    View
    , Button,
    Alert,
    StyleSheet,
    TextInput,
    Text,
    ScrollView,
    Image,
    FlatList,
    ProgressBarAndroid
} from 'react-native';

const Dimensions = require('Dimensions'); //必须要写这一行，否则报错，无法找到这个变量
const ScreenWidth = Dimensions.get('window').width;
const ScreenHeight = Dimensions.get('window').height;
export default class NetWork_T extends React.Component {
    constructor(props) {
        super(props);
        this.click = this.click.bind(this);
        this.state = {isLoading: false, isGetNet: false, json: "", listDatas: []};
    }

    getISok() {
        Alert.alert("获取成功");
        this.setState((prevState) => (
            {
                isLoading: false
            })
        );
    }

    getIsFail() {
        Alert.alert("获取失败");
    }

    setJson(json) {
        this.setState((prevState) => (
            {
                json: json
            })
        );
    }

    checkJson(myJson) {
        //{"Statu":1,"Msg":"","BackUrl":"","Data":{"engiTeamId":102,"engiTeam":"上海腾隆（集团）有限公司","groupId":2356,"groupName":"腾隆 排摸1","groupLoginName":"腾隆 排摸1","groupLoginPwd":"202CB962AC59075B964B07152D234B70","isReset":0}}
        var state = myJson.Statu;
        console.log(state);
        var datas = myJson.Data;
        var array = [];
        if (state == 1) {
            this.getISok();

        } else {
            this.getIsFail();
            return;
        }
        array.push({
            'engiTeam': datas.engiTeam,
            'groupLoginName': datas.groupLoginName,
            'groupName': datas.groupName,
            'groupLoginPwd': datas.groupLoginPwd,
            'key': '1'
        });

        array.push({
            'engiTeam': datas.engiTeam,
            'groupLoginName': datas.groupLoginName,
            'groupName': datas.groupName,
            'groupLoginPwd': datas.groupLoginPwd,
            'key': '2'
        });
        array.push({
            'engiTeam': datas.engiTeam,
            'groupLoginName': datas.groupLoginName,
            'groupName': datas.groupName,
            'groupLoginPwd': datas.groupLoginPwd,
            'key': '3'
        });
        array.push({
            'engiTeam': datas.engiTeam,
            'groupLoginName': datas.groupLoginName,
            'groupName': datas.groupName,
            'groupLoginPwd': datas.groupLoginPwd,
            'key': '4'
        });
        console.log("come hear1" + array.length);
        this.setState((prevState) => (
                {
                    listDatas: array
                }), function () {
                console.log("come hear2" + this.state.listDatas.length);
                for (var i = 0; i < this.state.listDatas.length; i++) {
                    console.log(this.state.listDatas[i].engiTeam + this.state.listDatas[i].groupLoginName + this.state.listDatas[i].groupName + this.state.listDatas[i].groupLoginPwd);
                }
            }
        );

    }

    //将事件放在组件外部
    getRequest(url) {
        var opts = {
            method: "GET"
        }
        fetch(url, opts)
            .then((response) => {
                return response.json();
            })
            .then((myJson) => {
                this.setJson(JSON.stringify(myJson));
                console.log(JSON.stringify(myJson));
                this.checkJson(myJson);

            })
            .catch((error) => {
                console.log(error);

            })

    }


    click() {
        this.setState((prevState) => (
            {
                isLoading: true
            })
        );


        this.getRequest('http://:80/Interface/GetPCLoginInfoByMac?mac=08:62:66:d8:33:c5');
    }

    render() {
        return (


            
                
                {this.state.isLoading ?  : null}
                {this.state.json} 
                
                     (
                            
                                {item.engiTeam}
                                
                                    名称：{item.groupLoginName}/
                                    简介：{item.groupName}
                                
                                {item.groupLoginPwd}
                            
                        )
                        }

                    >
                
            


        );
    };

}