Android undefined不是对象（评估'；_this2.props.navigation）
我是一个新的本地人，并试图自己学习。我已经实现了导航抽屉，并制作了一些屏幕。在我的演示中，我有listview，我只是试图将用户导航到所选项目详细信息页面，但我遇到了上述错误 这里是index.android.js文件：-Android undefined不是对象（评估'；_this2.props.navigation）,android,listview,react-native,navigation-drawer,Android,Listview,React Native,Navigation Drawer,我是一个新的本地人，并试图自己学习。我已经实现了导航抽屉，并制作了一些屏幕。在我的演示中，我有listview，我只是试图将用户导航到所选项目详细信息页面，但我遇到了上述错误 这里是index.android.js文件：- import React, { Component } from 'react'; import { AppRegistry, } from 'react-native'; import Main from './src/Main' import { DrawerNavi
import React, { Component } from 'react';
import {
AppRegistry,
} from 'react-native';
import Main from './src/Main'
import { DrawerNavigator } from 'react-navigation';
import { TabNavigator } from 'react-navigation';
import LoginScreen from './src/LoginScreen';
import { StackNavigator } from 'react-navigation';
import movielisting from './src/movielisting';
class reactNavigationSample extends Component {
render(){
const { navigation } = this.props;
return (
<MyComponent navigation={navigation}/>
);
}
}
const DrawerApp = DrawerNavigator({
movielisting: {screen: movielisting},
LoginScreen:{ screen: Main},
});
AppRegistry.registerComponent('reactNavigationSample', () => DrawerApp);
import React, { Component } from 'react';
import { StatusBar } from 'react-native'
import { StackNavigator } from 'react-navigation';
import { NavigationActions } from 'react-navigation';
import { Actions, ActionConst } from 'react-native-router-flux';
import home from './images/home.png';
import ActionBar from './ActionBar';
import ProgressBar from './ProgressBar';
const { width: viewportWidth, height: viewportHeight } = Dimensions.get('window');
import {
StyleSheet,
Text,
Image,
View,
AsyncStorage,
TouchableOpacity,TouchableHighlight,Dimensions,ListView
} from 'react-native';
const uri = 'http://csswrap.com/wp-content/uploads/2015/03/showmenu.png';
export default class movielisting extends Component {
constructor(props) {
super(props);
var ds = new ListView.DataSource({rowHasChanged: (r1, r2) => r1 !== r2});
this.state = {
moviesData: ds.cloneWithRows([]),
};
}
componentDidMount() {
this.fetchMoviesData();
}
renderRow(rowData){
AsyncStorage.setItem('moviesData', JSON.stringify(rowData));
return (
<View style={styles.thumb} >
<TouchableOpacity onPress={() => this.props.navigation.navigate('MovieDeatilScreen')}>
<Image
source={{uri:'https://image.tmdb.org/t/p/w500_and_h281_bestv2/'+rowData.poster_path}}
resizeMode="cover"
style={styles.img} />
<Text style={styles.txt}>{rowData.title} (Rating: {Math.round( rowData.vote_average * 10 ) / 10})</Text>
</TouchableOpacity>
</View>
);
}
fetchMoviesData() {
var url = 'http://api.themoviedb.org/3/movie/now_playing?api_key=17e62b78e65bd6b35f038505c1eec409';
fetch(url)
.then( response => response.json() )
.then( jsonData => {
this.setState({
moviesData: this.state.moviesData.cloneWithRows(jsonData.results),
});
})
.catch( error => console.log('Error fetching: ' + error) );
}
render() {
return (
<View style={styles.container}>
<View style={styles.navBar}>
<TouchableOpacity onPress={() => this.props.navigation.navigate('DrawerOpen')} style={styles.action} >
<Image style={styles.avatar} source={{uri}} />
</TouchableOpacity>
<Text style={styles.navBarHeader}>Movie List Screen</Text>
</View>
<ListView
dataSource={this.state.moviesData}
renderRow={this.renderRow}
enableEmptySections={true}
style={styles.ListViewcontainer}
/>
<View style={styles.footer}>
<ActionBar />
</View>
</View>
);
}
renderLoader(){
return (
this.state.showLoader?<View><Spinner color='red' /></View>:null
)
}
hideLoader(){
setTimeout(() => {
this.setState({showLoader:false})
}, 1);
}
}
const styles = StyleSheet.create({
container: {
position:'relative',
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
footer: {
position: 'absolute',
flex:0.1,
left: 0,
right: 0,
bottom: -12,
flexDirection:'row',
height:70,
alignItems:'center',
},
navBar: {
position: 'absolute',
flexDirection: 'row',
top:0,
right:0,
left:0,
paddingTop:15,
height: 64,
backgroundColor: '#1EAAF1'
},
navBarHeader: {
flex: 1,
left:30,
paddingTop:5,
top:2,
color: '#FFFFFF',
fontWeight: 'bold',
textAlign: 'left',
},avatar: {
left:10,
bottom:3,
width: 35,
height: 35,
},action: {
flex: 0.4,
},thumb: {
backgroundColor: '#ffffff',
marginBottom: 5,
elevation: 1
},
img: {
height: 300
},
txt: {
margin: 10,
fontSize: 16,
textAlign: 'left'
},ListViewcontainer:{
marginTop:110,
bottom: 50,
}
});
movielisting.navigationOptions = {
drawer: {
icon: () => (
<Image
source={home}
style={[styles.tabIcon, {tintColor: 'black'}]}
/>
)}
};
import React, { Component, PropTypes } from 'react';
import {
AppRegistry,
StyleSheet,
Text,
View,
Image,
TouchableOpacity,
TextInput,
AsyncStorage,
Icon
} from 'react-native';
import ActionBar from './ActionBar';
import { StackNavigator } from 'react-navigation';
import { NavigationActions } from 'react-navigation';
import Dimensions from 'Dimensions';
import { Actions, ActionConst } from 'react-native-router-flux';
const uri = 'http://csswrap.com/wp-content/uploads/2015/03/showmenu.png';
export default class MovieDeatilScreen extends Component {
constructor(props){
super(props);
this.state = {
moviesData:''
};
}
componentDidMount() {
AsyncStorage.getItem("moviesData").then((value) => {
this.setState({"moviesData": JSON.parse(value)});
// this.Loaddata();
}).done();
}
// Loaddata() {
// for(let i = 0; i < this.state.moviesData.length; i++){
//
// this.setState({'username' : this.state.SignedUpuser[i].name});
//
// }
// }
render() {
return (
<View style={styles.container}>
<View style={styles.navBar}>
<TouchableOpacity onPress={() => this.props.navigation.navigate('DrawerOpen')} style={styles.action} >
<Image style={styles.avatar} source={{uri}} />
</TouchableOpacity>
<Text style={styles.navBarHeader}>Movie Deatil Screen</Text>
</View>
<View style={styles.thumb}>
<Image
source={{uri:'https://image.tmdb.org/t/p/w500_and_h281_bestv2/'+this.state.moviesData.poster_path}}
resizeMode="cover"
style={styles.img} />
<Text style={styles.txt}>{this.state.moviesData.title} (Rating: {Math.round( this.state.moviesData.vote_average * 10 ) / 10})</Text>
</View>
<View style={styles.footer}>
<ActionBar />
</View>
</View>
);
}
}
const DEVICE_WIDTH = Dimensions.get('window').width;
const DEVICE_HEIGHT = Dimensions.get('window').height;
const styles = StyleSheet.create({
container: {
position:'relative',
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
footer: {
position: 'absolute',
flex:0.1,
left: 0,
right: 0,
bottom: -12,
flexDirection:'row',
height:70,
alignItems:'center',
},
navBar: {
position: 'absolute',
flexDirection: 'row',
top:0,
right:0,
left:0,
paddingTop:15,
height: 64,
backgroundColor: '#1EAAF1'
},
navBarHeader: {
flex: 1,
left:30,
paddingTop:5,
top:2,
color: '#FFFFFF',
fontWeight: 'bold',
textAlign: 'left',
},avatar: {
left:10,
bottom:3,
width: 35,
height: 35,
},action: {
flex: 0.4,
},thumb: {
backgroundColor: '#ffffff',
marginBottom: 5,
elevation: 1
},
img: {
height: 300
},
txt: {
margin: 10,
fontSize: 16,
textAlign: 'left'
},ListViewcontainer:{
marginTop:110,
bottom: 50,
}
});
MovieDeatilScreen.navigationOptions = {
drawer: {
icon: () => (
<Image
source={home}
style={[styles.tabIcon, {tintColor: 'black'}]}
/>
)}
};
import React，{Component}来自'React'；
进口{
评估学，
}从“反应本机”；
从“/src/Main”导入Main
从“react navigation”导入{DroperNavigator}；
从“反应导航”导入{TabNavigator}；
从“/src/LoginScreen”导入LoginScreen；
从“react navigation”导入{StackNavigator}；
从“/src/movielisting”导入movielisting；
类reactNavigationSample扩展组件{
render（）{
const{navigation}=this.props；
返回(
);
}
}
常数paurerapp=抽屉驱动程序({
movielisting:{屏幕：movielisting}，
登录屏幕：{screen:Main}，
});
AppRegistry.registerComponent（'reactNavigationSample'，（）=>DroperApp）；
import React, { Component } from 'react';
import {
AppRegistry,
} from 'react-native';
import Main from './src/Main'
import { DrawerNavigator } from 'react-navigation';
import { TabNavigator } from 'react-navigation';
import LoginScreen from './src/LoginScreen';
import { StackNavigator } from 'react-navigation';
import movielisting from './src/movielisting';
class reactNavigationSample extends Component {
render(){
const { navigation } = this.props;
return (
<MyComponent navigation={navigation}/>
);
}
}
const DrawerApp = DrawerNavigator({
movielisting: {screen: movielisting},
LoginScreen:{ screen: Main},
});
AppRegistry.registerComponent('reactNavigationSample', () => DrawerApp);
import React, { Component } from 'react';
import { StatusBar } from 'react-native'
import { StackNavigator } from 'react-navigation';
import { NavigationActions } from 'react-navigation';
import { Actions, ActionConst } from 'react-native-router-flux';
import home from './images/home.png';
import ActionBar from './ActionBar';
import ProgressBar from './ProgressBar';
const { width: viewportWidth, height: viewportHeight } = Dimensions.get('window');
import {
StyleSheet,
Text,
Image,
View,
AsyncStorage,
TouchableOpacity,TouchableHighlight,Dimensions,ListView
} from 'react-native';
const uri = 'http://csswrap.com/wp-content/uploads/2015/03/showmenu.png';
export default class movielisting extends Component {
constructor(props) {
super(props);
var ds = new ListView.DataSource({rowHasChanged: (r1, r2) => r1 !== r2});
this.state = {
moviesData: ds.cloneWithRows([]),
};
}
componentDidMount() {
this.fetchMoviesData();
}
renderRow(rowData){
AsyncStorage.setItem('moviesData', JSON.stringify(rowData));
return (
<View style={styles.thumb} >
<TouchableOpacity onPress={() => this.props.navigation.navigate('MovieDeatilScreen')}>
<Image
source={{uri:'https://image.tmdb.org/t/p/w500_and_h281_bestv2/'+rowData.poster_path}}
resizeMode="cover"
style={styles.img} />
<Text style={styles.txt}>{rowData.title} (Rating: {Math.round( rowData.vote_average * 10 ) / 10})</Text>
</TouchableOpacity>
</View>
);
}
fetchMoviesData() {
var url = 'http://api.themoviedb.org/3/movie/now_playing?api_key=17e62b78e65bd6b35f038505c1eec409';
fetch(url)
.then( response => response.json() )
.then( jsonData => {
this.setState({
moviesData: this.state.moviesData.cloneWithRows(jsonData.results),
});
})
.catch( error => console.log('Error fetching: ' + error) );
}
render() {
return (
<View style={styles.container}>
<View style={styles.navBar}>
<TouchableOpacity onPress={() => this.props.navigation.navigate('DrawerOpen')} style={styles.action} >
<Image style={styles.avatar} source={{uri}} />
</TouchableOpacity>
<Text style={styles.navBarHeader}>Movie List Screen</Text>
</View>
<ListView
dataSource={this.state.moviesData}
renderRow={this.renderRow}
enableEmptySections={true}
style={styles.ListViewcontainer}
/>
<View style={styles.footer}>
<ActionBar />
</View>
</View>
);
}
renderLoader(){
return (
this.state.showLoader?<View><Spinner color='red' /></View>:null
)
}
hideLoader(){
setTimeout(() => {
this.setState({showLoader:false})
}, 1);
}
}
const styles = StyleSheet.create({
container: {
position:'relative',
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
footer: {
position: 'absolute',
flex:0.1,
left: 0,
right: 0,
bottom: -12,
flexDirection:'row',
height:70,
alignItems:'center',
},
navBar: {
position: 'absolute',
flexDirection: 'row',
top:0,
right:0,
left:0,
paddingTop:15,
height: 64,
backgroundColor: '#1EAAF1'
},
navBarHeader: {
flex: 1,
left:30,
paddingTop:5,
top:2,
color: '#FFFFFF',
fontWeight: 'bold',
textAlign: 'left',
},avatar: {
left:10,
bottom:3,
width: 35,
height: 35,
},action: {
flex: 0.4,
},thumb: {
backgroundColor: '#ffffff',
marginBottom: 5,
elevation: 1
},
img: {
height: 300
},
txt: {
margin: 10,
fontSize: 16,
textAlign: 'left'
},ListViewcontainer:{
marginTop:110,
bottom: 50,
}
});
movielisting.navigationOptions = {
drawer: {
icon: () => (
<Image
source={home}
style={[styles.tabIcon, {tintColor: 'black'}]}
/>
)}
};
import React, { Component, PropTypes } from 'react';
import {
AppRegistry,
StyleSheet,
Text,
View,
Image,
TouchableOpacity,
TextInput,
AsyncStorage,
Icon
} from 'react-native';
import ActionBar from './ActionBar';
import { StackNavigator } from 'react-navigation';
import { NavigationActions } from 'react-navigation';
import Dimensions from 'Dimensions';
import { Actions, ActionConst } from 'react-native-router-flux';
const uri = 'http://csswrap.com/wp-content/uploads/2015/03/showmenu.png';
export default class MovieDeatilScreen extends Component {
constructor(props){
super(props);
this.state = {
moviesData:''
};
}
componentDidMount() {
AsyncStorage.getItem("moviesData").then((value) => {
this.setState({"moviesData": JSON.parse(value)});
// this.Loaddata();
}).done();
}
// Loaddata() {
// for(let i = 0; i < this.state.moviesData.length; i++){
//
// this.setState({'username' : this.state.SignedUpuser[i].name});
//
// }
// }
render() {
return (
<View style={styles.container}>
<View style={styles.navBar}>
<TouchableOpacity onPress={() => this.props.navigation.navigate('DrawerOpen')} style={styles.action} >
<Image style={styles.avatar} source={{uri}} />
</TouchableOpacity>
<Text style={styles.navBarHeader}>Movie Deatil Screen</Text>
</View>
<View style={styles.thumb}>
<Image
source={{uri:'https://image.tmdb.org/t/p/w500_and_h281_bestv2/'+this.state.moviesData.poster_path}}
resizeMode="cover"
style={styles.img} />
<Text style={styles.txt}>{this.state.moviesData.title} (Rating: {Math.round( this.state.moviesData.vote_average * 10 ) / 10})</Text>
</View>
<View style={styles.footer}>
<ActionBar />
</View>
</View>
);
}
}
const DEVICE_WIDTH = Dimensions.get('window').width;
const DEVICE_HEIGHT = Dimensions.get('window').height;
const styles = StyleSheet.create({
container: {
position:'relative',
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
footer: {
position: 'absolute',
flex:0.1,
left: 0,
right: 0,
bottom: -12,
flexDirection:'row',
height:70,
alignItems:'center',
},
navBar: {
position: 'absolute',
flexDirection: 'row',
top:0,
right:0,
left:0,
paddingTop:15,
height: 64,
backgroundColor: '#1EAAF1'
},
navBarHeader: {
flex: 1,
left:30,
paddingTop:5,
top:2,
color: '#FFFFFF',
fontWeight: 'bold',
textAlign: 'left',
},avatar: {
left:10,
bottom:3,
width: 35,
height: 35,
},action: {
flex: 0.4,
},thumb: {
backgroundColor: '#ffffff',
marginBottom: 5,
elevation: 1
},
img: {
height: 300
},
txt: {
margin: 10,
fontSize: 16,
textAlign: 'left'
},ListViewcontainer:{
marginTop:110,
bottom: 50,
}
});
MovieDeatilScreen.navigationOptions = {
drawer: {
icon: () => (
<Image
source={home}
style={[styles.tabIcon, {tintColor: 'black'}]}
/>
)}
};
import React，{Component}来自'React'；
从“react native”导入{StatusBar}
从“react navigation”导入{StackNavigator}；
从“react navigation”导入{NavigationActions}；
从“react native router flux”导入{Actions，ActionConst}；
从“./images/home.png”导入主页；
从“/ActionBar”导入ActionBar；
从“/ProgressBar”导入ProgressBar；
const{width:viewportWidth，height:viewportHeight}=Dimensions.get（'window'）；
进口{
样式表，
文本，
形象,，
看法
异步存储，
可触摸不透明度、可触摸高光、尺寸、列表视图
}从“反应本机”；
常量uri=http://csswrap.com/wp-content/uploads/2015/03/showmenu.png';
导出默认类movielisting扩展组件{
建造师（道具）{
超级（道具）；
var ds=新的ListView.DataSource（{rowHasChanged:（r1，r2）=>r1！==r2}）；
此.state={
moviesData:ds.cloneWithRows（[]），
};
}
componentDidMount（）{
这是fetchMoviesData（）；
}
renderRow（行数据）{
AsyncStorage.setItem（'moviesData'，JSON.stringify（rowData））；
返回(
this.props.navigation.navigate（'MovieDeatilScreen'）}>
{rowData.title}（评级：{Math.round（rowData.vote_average*10）/10}）
);
}
fetchMoviesData（）{
var url='1〕http://api.themoviedb.org/3/movie/now_playing?api_key=17e62b78e65bd6b35f038505c1eec409';
获取（url）
.then（response=>response.json（））
.然后（jsonData=>{
这是我的国家({
moviesData:this.state.moviesData.cloneWithRows（jsonData.results），
});
})
.catch（error=>console.log（'error fetching:'+error））；
}
render（）{
返回(
this.props.navigation.navigate（'drawerropen'）}style={styles.action}>
电影列表屏幕
);
}
renderLoader（）{
返回(
this.state.showLoader？：null
)
}
hideLoader（）{
设置超时（（）=>{
this.setState（{showLoader:false}）
}, 1);
}
}
const styles=StyleSheet.create({
容器：{
位置：'相对'，
弹性：1，
为内容辩护：“中心”，
对齐项目：“居中”，
背景颜色：“#F5FCFF”，
},
欢迎:{
尺寸：20，
textAlign:'中心'，
差额：10，
},
页脚：{
位置：'绝对'，
弹性系数：0.1，
左:0,，
右:0,，
底部：-12，
flexDirection:“行”，
身高：70，
对齐项目：'中心'，
},
导航栏：{
位置：'绝对'，
flexDirection:'行'，
排名：0，
右:0,，
左:0,，
paddingTop:15，
身高：64，
背景颜色：“#1EAAF1”
},
导航栏标题：{
弹性：1，
左:30,，
paddingTop:5，
排名：2，
颜色：“#FFFFFF”，
fontWeight:'粗体'，
textAlign:'左'，
}，头像：{
左:10,，
底部：3，
宽度：35，
身高：35，
}，行动：{
弹性系数：0.4，
}，拇指：{
背景颜色：“#ffffff”，
marginBottom:5，
标高：1
},
img：{
身高：300
},
txt:{
差额：10，
尺寸：16，
textAlign:'左'
}，ListViewcontainer:{
玛金托普：110，
底数：50，
}
});
movielisting.navigationOptions={
出票人：{
图标：（）=>(
)}
};