React-Native Native Android 模块 - Toast 示例 [英] React-Native Native Android Module - Toast Example
问题描述
我正在尝试学习使用 android 本机模块并使用 react-native 文档中的 toast 示例.(
根据您显示的代码,这是因为您没有正确导入 App.js
中的模块,您应该在与 App.js
相同的目录中创建一个名为 ToastExample.js
的文件,然后放置
import {NativeModules} from 'react-native';module.exports = NativeModules.ToastExample;
如果在你的 ToastModule.java
中有
@Override公共字符串 getName() {返回吐司示例";}
在 getName()
方法上.
I'm trying to learn to work with android native module and using the toast example in the react-native docs. (https://facebook.github.io/react-native/docs/native-modules-android). However, I am facing an issue where the native module that I was trying to export was unable to be resolved/undefine.
My directory structure is as followed:
example
-android
-app
-src
-main
- java
-com
-example
-CustomToastPackage.java
-ToastModule.java
-MainActivity.java
-MainApplication.java
- res
- AndroidManifest.xml
-ios
-app.js
-index.js
-package.json
My index.js:
import {AppRegistry} from 'react-native';
import App from './App';
import {name as appName} from './app.json';
import {NativeModules} from 'react-native';//Added this
module.exports = NativeModules.ToastAndroidTutorial;//Added this
AppRegistry.registerComponent(appName, () => App);
And my App.js
import React, {Component} from 'react';
import {Platform, StyleSheet, Text, View} from 'react-native';
import ToastExample from './ToastExample';//Added this
const instructions = Platform.select({
ios: 'Press Cmd+R to reload,\n' + 'Cmd+D or shake for dev menu',
android:
'Double tap R on your keyboard to reload,\n' +
'Shake or press menu button for dev menu',
});
type Props = {};
export default class App extends Component<Props> {
render() {
return (
<View style={styles.container}>
ToastExample.show('Awesome', ToastExample.SHORT);//Added this
<Text style={styles.welcome}>Welcome to React Native!</Text>
<Text style={styles.instructions}>To get started, edit App.js</Text>
<Text style={styles.instructions}>{instructions}</Text>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
instructions: {
textAlign: 'center',
color: '#333333',
marginBottom: 5,
},
});
This is the error I am getting.
Based on the code you are showing, this is because you are not correctly importing the Module in your App.js
, you should create a file named ToastExample.js
in the same directory as App.js
and then place
import {NativeModules} from 'react-native';
module.exports = NativeModules.ToastExample;
if in your ToastModule.java
you have
@Override
public String getName() {
return "ToastExample";
}
on the getName()
method.
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