用fetch（）的方法获取网络数据，ListView来显示数据。
完整Demo：
[html]view plaincopy
import React, {Component} from 'react'
import {AppRegistry, StyleSheet, Image, Text, View, ListView} from 'react-native'
varREQUEST_URL='https://raw.githubusercontent.com/facebook/react-native/master/docs/MoviesExample.json';
conststyles=StyleSheet.create({
container: {
flex:1,
flexDirection:'row',
justifyContent:'center',
alignItems:'center',
backgroundColor:'#F5FCFF'
},
thunbnail:{
width:100,
height:80,
},
});
class TestURL extends Component{
constructor(props) {
super(props)
this.state={
dataSource:null
}
}
render() {
if (!this.state.dataSource) {
return this.renderLoadingView();
}
return this.renderMovie();
}
fetchData() {
varmyRequest=newRequest(REQUEST_URL);
myRequest.method='GET';
constds=newListView.DataSource({rowHasChanged: (r1, r2) =>r1 !== r2})
fetch(myRequest).then((response) =>response.json())
.then((responseData) =>this.setState({dataSource:ds.cloneWithRows(responseData.movies)}))
.catch((error) =>{console.log(error)})
}
componentDidMount() {
this.fetchData();
}
renderLoadingView() {
return(
loading...
);
}
renderMovie() {
return(
dataSource={this.state.dataSource}
renderRow={(movie)=>this._renderRow(movie)}
/>
)
}
_renderRow(movie) {
return (
{movie.title}
)
}
}
AppRegistry.registerComponent('Demo', ()=>TestURL);
下面进行详细介绍：
1. 定义样式：
[html]view plaincopy
conststyles=StyleSheet.create({
container: {
flex:1,
flexDirection:'row',
justifyContent:'center',
alignItems:'center',
backgroundColor:'#F5FCFF'
},
thunbnail:{
width:100,
height:80,
},
});
2. 数据加载完成前后UI的渲染：
[html]view plaincopy
render() {
if (!this.state.dataSource) {
return this.renderLoadingView();
}
return this.renderMovie();
}
如果listview的DataSource是null的话，会加载loading的动画，如果不为空的话，就会显示Listview
3.显示loading...的UI
[html]view plaincopy
renderLoadingView() {
return(
loading...
);
}
4.加载完数据后，显示ListView的代码：
[html]view plaincopy
renderMovie() {
return(
dataSource={this.state.dataSource}
renderRow={(movie)=>this._renderRow(movie)}
/>
)
}
_renderRow(movie) {
return (
{movie.title}
)
}
}
