With the opportunity of Silicon chips on Mac. We started to develop a Mac application by using React Native. We are not using any input field, but we need to identify which key is pressed from keyboard while the user is focussed to our App. Basically we want to listen all keyboard events while user is using our App. What is the best approach for this problem?
If you use react-native on macOS, then you may probably use react-native-web with electron or directly in the web browser.
This is my solution :
import React, { Component } from 'react';
import { Text, View } from 'react-native';
export default class App extends Component {
handleKeyDown = (e) => {
console.log(`${e.code}`);
// Do your stuff...
};
componentDidMount = () => {
document.onkeydown = this.handleKeyDown;
};
componentWillUnmount = () => {
document.onkeydown = null;
};
render = () => {
return (
<View>
<Text>{'Example'}</Text>
</View>
);
};
}
Related
I want to navigate the user to another screen in react native project after native app widget click in android. I was able to catch event using native event emitter in my MainView.js and there i changed state of one of my component and it got changed but UI is not getting rendered after this state change. It is showing blank screen and there is not error on the console. Thanks in advance for any help!!
export default class MainView extends React.Component {
constructor(props) {
super(props);
this.state = {text: 'Hi, This is main screen for app widget!!!'};
}
componentDidMount() {
const eventEmitter = new NativeEventEmitter();
this.listener = eventEmitter.addListener('MyCustomEvent', (event) => {
console.log('MyCustomEvent -->', event);
console.log('MyCustomEvent ArticleId -->', event.ArticleId);
if (event.ArticleId === data.articleId) {
console.log('data ArticleId true', data.articleId);
//navigation.push('Article Details', data);
this.setState({
text: data.articleDes,
});
// setText(data.articleDes);
console.log('text -->', this.state.text);
} else {
// setText('No such article found.');
console.log('text -->', this.state.text);
}
});
}
componentWillUnmount() {
this.eventListener.remove(); //Removes the listener
}
render() {
return (
<View style={{flex: 1}}>
<Text>{this.state.text}</Text>
<Button
title="click"
onPress={() => this.props.navigation.push('Article Details', data)}
/>
</View>
);
}
}
CustomActivity source code which is launched from appwidget click. From this activity's oncreate, I'm emitting events to react-native main view.
int articleId = 0;
if (getIntent() != null) {
articleId = getIntent().getIntExtra("articleId", 0);
Log.e("articleid", "" + articleId);
}
// Put data to map
WritableMap payload = Arguments.createMap();
payload.putInt("ArticleId", articleId);
// Emitting event from java code
ReactContext context = getReactNativeHost().getReactInstanceManager().getCurrentReactContext();
if ( context != null && context.hasActiveCatalystInstance()) {
Log.e("react context", "not null");
(getReactNativeHost().getReactInstanceManager().getCurrentReactContext())
.getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)
.emit("MyCustomEvent", payload);
}
That is not how to use NativeEventEmitter. You need to initialise the NativeEventEmitter with the native module you are emitting events from:
import { NativeEventEmitter, NativeModules } from 'react-native';
const { myNativeModule } = NativeModules;
componentDidMount() {
...
const eventEmitter = new NativeEventEmitter(myNativeModule);
this.eventListener = eventEmitter.addListener('myEvent', (event) => {
console.log(event.eventProperty) // "someValue"
});
...
}
componentWillUnmount() {
this.eventListener.remove(); //Removes the listener
}
Read more about NativeModules here: https://reactnative.dev/docs/native-modules-android
This sound familiar with an issue I am experiencing on IOS. The code is similar, but I cannot guarantee that the underlying structure in Android works in the same way. Anyways, I am sending an event message from IOS-Native (written in swift in xCode) to React-native file using the NativeEventEmitter. After the initial render, the value just wont update, and as I understand this issue is not limited to this type of Event. After some googling I found out that everything you read from state inside that event-callback has a reference to only the first render, and will not update on future renders.
Solution; use useRef so you keep a reference to the the updated value. useRef keeps the value across renders and event-callbacks. This is not something I have found out myself, please look at https://medium.com/geographit/accessing-react-state-in-event-listeners-with-usestate-and-useref-hooks-8cceee73c559 and React useState hook event handler using initial state for, they are the one that deserves the credit.
For the life of me, I can't figure it out. All it shows is spinning without end and i am confused on the order of the life cycle happening. Basically, it goes to login or home screen and it works correctly on emulator but not on real device. I am on react 16.8.6 and react-native 0.60.5 environment.
I am getting started with RN and my debugging tools are not great. But for now just used Alert to see and the logic that was supposed to redirect to login/home screen is never reached. The Alerts shown are in the following order:
BS
mount2
render
mount1
My code is below: if the token exists, load home screen. else load auth screen is what I wanted to achieve but for now the line:
this.props.navigation.navigate(!goToLogin ? 'App' : 'Auth');
is never reached and so, spins a lot. Any help?
import React, {Component} from 'react';
import {StatusBar, View, Alert} from 'react-native';
import {
getUserToken,
loggedInToAssociation,
extractToken,
} from '../shared/loggedinUser';
import {setLanguage} from '../shared/localization';
import {appOptions} from '../config';
import Spinner from '../components/Spinner';
export default class AuthLoadingScreen extends Component {
constructor() {
super();
this.state = {
languageLoaded: false
};
}
componentDidMount() {
Alert.alert("mount1","oumnt1") // shown
loggedInToAssociation()
.then(details => {
// details is an array now
setLanguage(details['language']);
this.setState({languageLoaded: true});
Alert.alert("mount2","oumnt2") // SHOWN
})
.catch(err => {
setLanguage(appOptions.defaultLanguage);
this.setState({languageLoaded: true});
Alert.alert("mount3","oumnt3")
});
}
// Fetch the token from storage then navigate to our appropriate place
_bootstrapAsync = async () => {
const userToken = await getUserToken();
Alert.alert("bs","bs") // SHOWN
const tokenInfo = extractToken(userToken, 'both');
let goToLogin = true; // force user to go to the login page
if (tokenInfo.length == 2) {
goToLogin = false;
}
Alert.alert("bs2","bs2") // NEVER SHOWN
this.props.navigation.navigate(!goToLogin ? 'App' : 'Auth');
};
// Render any loading content that you like here
render() {
if (this.state.languageLoaded){
this._bootstrapAsync().then(s=>{
console.log(s)
}).catch(e=>{
console.log(e)
})
}
return (
<View>
<Spinner />
<StatusBar barStyle="default" />
</View>
);
}
}
did you check your debug console when running on device? There might be an unhandled promise rejection. The promise didn't go through but nowhere to handle the catch (consider try-catch scenario for this context).
It might be having a problem with this method.
extractToken(userToken, 'both')
I want to add UPI payment in my App and currently using expo tool to create the app but now I got stuck as there is unable to find any direct implementation by using js only and require me to eject from expo. If there is any way by which I can implement the UPI without exiting from expo as it expo makes things really easy.
I have tried to implement the simple code provided in the docs for react-native-upi-payment but it is not moving ahead and require me to move through android manifest which is not inside the expo project.
import React from 'react'
import RNUpiPayment from 'react-native-upi-payment'
import { View, StyleSheet, Container } from 'react-native'
import { Input, Button } from 'react-native-elements'
import { Constants } from 'expo'
export default class PaymentScreen extends React.Component {
static navigationOptions = {
header: null
}
goToBhimUPI = () => {
RNUpiPayment.initializePayment({
vpa: 'someupi#ybl', // or can be john#ybl or mobileNo#upi
payeeName: 'Name',
amount: '1',
transactionRef: 'some-random-id'
}, this.successCallback, this.failureCallback);
}
failureCallback = (data) =>{
console.log(data)
}
successCallback = (data) => {
console.log(data)
}
render() {
return(
<Button
containerStyle = {styles.button}
type = 'clear'
title = 'Bhim UPI'
onPress = {this.goToBhimUPI}
/>
)
}
}
I expect this module to take me to the UPI payment gateway and return to the place from where it is called. Currently this is giving me error:(undefined is not an object(evaluating 'UpiModule.intializePayment'))
you can do this using react-native-upi-payment for all types of upi available or else phonepesdk for only phonepe integration
Click to see image
Button refresh on AppBar is not refresh on page Dashboard because I just use Component Card but work on page using component List or Datagrid, so I want to config show/hide refresh button on AppBar or how to fix it work for page not use component List or Datagrid.
Sorry I'm not strong in English.
You'll have to fetch some data from the react-admin state for it to work. Indeed, the refresh button just trigger the refreshView action which update the state.admin.ui.viewVersion key of the the react-admin redux state. This key is a simple counter. Internally, we use this counter to check whether we must update some components data. Here is a simple example of a connected Dashboard which can do things when refreshed:
import React, { Component } from "react";
import { connect } from "react-redux";
class Dashboard extends Component {
componentDidMount() {
this.doOnMountAndWhenRefreshed();
}
componentDidUpdate(prevProps) {
if (prevProps.views !== this.props.views) {
this.doOnMountAndWhenRefreshed();
}
}
doOnMountAndWhenRefreshed = () => {
// This is where you do update your component:
// - Make API requests
// - Fetch data from the react-admin store, etc.
};
render() {
const { views } = this.props;
return <div>Refreshed {views} times.</div>;
}
}
const mapStateToProps = state => ({ views: state.admin.ui.viewVersion });
export default connect(
mapStateToProps,
{}
)(Dashboard);
You can see it working in this codesandbox
Edit for newer version of react-admin
import { useVersion } from 'react-admin';
const Dashboard = () => {
const version = useVersion();
return <div>Refreshed {version} times.</div>;
}
In react-admin 4.x I managed to get the desired behaviour like this:
import React from 'react'
import { useQuery } from 'react-query'
const noop = async () => new Date().valueOf()
export const MyDashboard = () => {
const { data } = useQuery('myDashboard', noop)
return (
<div>Last refreshed at {data}</div>
)
}
export default MyDashboard
Note how data represents the value returned by noop().
That way, whenever the user presses the refresh icon in the AppBar, the component is re-rendered.
I am using react-native 0.49.3 version, My Question is how to get the device token in react native for both IOS and Android I tried with this link but it not working for me, right now I tried in IOS. how to resolve it can one tell me how to configure?
I tried different solutions and I've decided to use React Native Firebase.
Here you will find everything about Notifications.
Also, you can use the others libraries that come with Firebase, like Analytics and Crash Reporting
After set up the library you can do something like:
// utils/firebase.js
import RNFirebase from 'react-native-firebase';
const configurationOptions = {
debug: true,
promptOnMissingPlayServices: true
}
const firebase = RNFirebase.initializeApp(configurationOptions)
export default firebase
// App.js
import React, { Component } from 'react';
import { Platform, View, AsyncStorage } from 'react-native';
// I am using Device info
import DeviceInfo from 'react-native-device-info';
import firebase from './utils/firebase';
class App extends Component {
componentDidMount = () => {
var language = DeviceInfo.getDeviceLocale();
firebase.messaging().getToken().then((token) => {
this._onChangeToken(token, language)
});
firebase.messaging().onTokenRefresh((token) => {
this._onChangeToken(token, language)
});
}
_onChangeToken = (token, language) => {
var data = {
'device_token': token,
'device_type': Platform.OS,
'device_language': language
};
this._loadDeviceInfo(data).done();
}
_loadDeviceInfo = async (deviceData) => {
// load the data in 'local storage'.
// this value will be used by login and register components.
var value = JSON.stringify(deviceData);
try {
await AsyncStorage.setItem(config.DEVICE_STORAGE_KEY, value);
} catch (error) {
console.log(error);
}
};
render() {
...
}
}
Then you can call the server with the token and all the info that you need.