I am trying to implement a turn by turn navigation in react native, I have used the package '#homee/react-native-mapbox-navigation'. I have used these instructions (https://reactnativeexample.com/smart-mapbox-turn-by-turn-routing-based-on-real-time-traffic-for-react-native/) to set all the gradle.properties / gradle.build and the manifest setting. This is how my app.js looks like:
import React from 'react';
import type {Node} from 'react';
import {
SafeAreaView,
ScrollView,
StatusBar,
StyleSheet,
Text,
useColorScheme,
View,
} from 'react-native';
import {
Colors,
DebugInstructions,
Header,
LearnMoreLinks,
ReloadInstructions,
} from 'react-native/Libraries/NewAppScreen';
import MapboxNavigation from '#homee/react-native-mapbox-navigation';
const App: () => Node = () => {
// const isDarkMode = useColorScheme() === 'dark';
// const backgroundStyle = {
// backgroundColor: isDarkMode ? Colors.darker : Colors.lighter,
// };
return (
<View style={styles.container}>
<MapboxNavigation
origin={[-97.760288, 30.273566]}
destination={[-97.918842, 30.494466]}
shouldSimulateRoute={true}
onLocationChange={(event) => {
const { latitude, longitude } = event.nativeEvent;
}}
onRouteProgressChange={(event) => {
const {
distanceTraveled,
durationRemaining,
fractionTraveled,
distanceRemaining,
} = event.nativeEvent;
}}
onError={(event) => {
const { message } = event.nativeEvent;
console.log('error', event)
}}
onCancelNavigation={() => {
// User tapped the "X" cancel button in the nav UI
// or canceled via the OS system tray on android.
// Do whatever you need to here.
}}
onArrive={() => {
// Called when you arrive at the destination.
}}
/>
</View>
);
};
const styles = StyleSheet.create({
container: {
flex: 1,
},
});
export default App;
This is what my simulator is showing:
Is there someone who knows why I am getting an empty screen and how to fix this?
Thx guys!
The code works fine the mistake was that I put the meta-data tag in the wrong section
of the androidManifest.xml. I fixed this and it worked
Related
I have run into this error in my code, and don't really know how to solve it, can anyone help me?
I get the following error message:
ERROR Warning: React has detected a change in the order of Hooks called by ScreenA. This will lead to bugs and errors if not fixed. For more information, read the Rules of Hooks: https://reactjs.org/link/rules-of-hooks
import React, { useCallback, useEffect, useState } from "react";
import { View, Text, StyleSheet, Pressable } from "react-native";
import { useNavigation } from '#react-navigation/native';
import { DancingScript_400Regular } from "#expo-google-fonts/dancing-script";
import * as SplashScreen from 'expo-splash-screen';
import * as Font from 'expo-font';
export default function ScreenA({ route }) {
const [appIsReady, setAppIsReady] = useState(false);
useEffect(() => {
async function prepare() {
try {
// Keep the splash screen visible while we fetch resources
await SplashScreen.preventAutoHideAsync();
// Pre-load fonts, make any API calls you need to do here
await Font.loadAsync({ DancingScript_400Regular });
// Artificially delay for two seconds to simulate a slow loading
// experience. Please remove this if you copy and paste the code!
await new Promise(resolve => setTimeout(resolve, 2000));
} catch (e) {
console.warn(e);
} finally {
// Tell the application to render
setAppIsReady(true);
}
}
prepare();
}, []);
const onLayoutRootView = useCallback(async () => {
if (appIsReady) {
// This tells the splash screen to hide immediately! If we call this after
// `setAppIsReady`, then we may see a blank screen while the app is
// loading its initial state and rendering its first pixels. So instead,
// we hide the splash screen once we know the root view has already
// performed layout.
await SplashScreen.hideAsync();
}
}, [appIsReady]);
if (!appIsReady) {
return null;
}
const navigation = useNavigation();
const onPressHandler = () => {
// navigation.navigate('Screen_B', { itemName: 'Item from Screen A', itemID: 12 });
}
return (
<View style={styles.body} onLayout={onLayoutRootView}>
<Text style={styles.text}>
Screen A
</Text>
<Pressable
onPress={onPressHandler}
style={({ pressed }) => ({ backgroundColor: pressed ? '#ddd' : '#0f0' })}
>
<Text style={styles.text}>
Go To Screen B
</Text>
</Pressable>
<Text style={styles.text}>{route.params?.Message}</Text>
</View>
)
}
const styles = StyleSheet.create({
body: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
},
text: {
fontSize: 40,
margin: 10,
fontFamily: 'DancingScript_400Regular'
}
})
I have read the rules of hooks: https://reactjs.org/docs/hooks-rules.html
The output is correct, but i want to fix this error before i add more additions to the app
You need to move useNavigation use before early returns.
Instead, always use Hooks at the top level of your React function, before any early returns.
The key is you need to call all the hooks in the exact same order on every component lifecycle update, which means you can't use hooks with conditional operators or loop statements such as:
if (customValue) useHook();
// or
for (let i = 0; i< customValue; i++) useHook();
// or
if (customValue) return;
useHook();
So moving const navigation = useNavigation(); before if (!appIsReady) {return null;}, should solve your problem:
export default function ScreenA({ route }) {
const [appIsReady, setAppIsReady] = useState(false);
const navigation = useNavigation();
// ...
}
I try to render a specific object inside a component (static object) in react native,after i get it with http request from axios API .The (node)server works fine but whenever i try to render it on the screen nothing shows.
Also when i console.log the object its correct(on client side too) but still nothing on simulator screen.
I dont know if i do something wrong or i need hooks for that(im new in react native so excuse me if i open again some same question) .
The code is below :
Client
import React, { Component,
useEffect,
useState } from 'react';
import {
StyleSheet,
Text,
View ,
} from 'react-native';
import axios from 'axios';
var res;
export default function App() {
axios.get('http://x.x.x.x:x/rec')
.then
(function (response){
console.log(response.data);
res = response.data;
})
return (
<View style = {styles.container}>
<Text>This car is a : {res}</Text>
</View>
)};
const styles = StyleSheet.create({
container: {
flex: 1 ,
marginTop:100,
},
});
Server
const app = require('express')();
const { json } = require('body-parser');
const car = {
type: "Fiat",
model : "500"
};
const myCar = JSON.stringify(car);
app.get("/rec",(req,res) => {
res.send(myCar);
console.log("Took Car");
})
app.get("/",(req,res) => {
res.set('Content-Type', 'text/plain');
res.send("You have done it ");
console.log("Took /");
})
var listener = app.listen(8888,()=>{
console.log(listener.address().port);
});
Better to use hook for it
import React, { Component, useEffect, useState } from 'react';
import { StyleSheet, Text, View } from 'react-native';
import axios from 'axios';
export default function App() {
const [label, setLabel] = useState('')
axios.get('http://x.x.x.x:x/rec')
.then((response) => {
const data = response.data
const resultLabel = typeof data === 'string' ? data :
`${data.type} ${data.model}`
setLabel(`This car is a : ${resultLabel}`)
})
return (
<View style = {styles.container}>
<Text>{label}</Text>
</View>
)};
const styles = StyleSheet.create({
container: {
flex: 1,
marginTop:100,
},
});
I can't seem to get this to work i know. the "onFileDownload={ ( { nativeEvent: { downloadUrl } } ) => {" has been added and i need my own code to make this work. I tried to use expo file system and expo sharing to get this to download but it's not working. all i want is that when they download a pdf instead of a preview they can share the document or save it. Any help would be greatly appreciated.
Below is the code i tried to make it work but failed (the alert function works but then nothing happens):
import React, { Component } from 'react';
import { StyleSheet, ActivityIndicator, View, Platform, PermissionsAndroid, Alert } from 'react-native';
import * as Permissions from 'expo-permissions';
import { WebView } from 'react-native-webview';
//sharing and download
import * as Sharing from 'expo-sharing';
import * as FileSystem from 'expo-file-system';
import { Image, Text, TouchableOpacity, } from 'react-native';
import * as ImagePicker from 'expo-image-picker';
export default function App() {
let [selectedImage, setSelectedImage] = React.useState(null);
let openImagePickerAsync = async () => {
const downloadResumable = FileSystem.createDownloadResumable(
{downloadUrl},
${FileSystem.documentDirectory}/pdf.pdf,
{},
);
const { uri, status } = await downloadResumable.downloadAsync();
// setSelectedImage({ localUri: uri });
Sharing.shareAsync(uri);
};
let openShareDialogAsync = async () => {
if (!(await Sharing.isAvailableAsync())) {
alert(Uh oh, sharing isn't available on your platform);
return;
}
Sharing.shareAsync(selectedImage.localUri);
};
// if (selectedImage !== null) {
// return (
//
//
// Share this
//
//
// );
// }
return (
<View style={{ flex: 1 }}>
<WebView
style={{ flex: 1 }}
source={{ uri: 'http://www.pdf995.com/' }}
onFileDownload={ ( { nativeEvent: { downloadUrl } } ) => {
Alert.alert(
"Documents",
"Do you wish to download and share this document",
[
{
text: "Download",
onPress: () => {openImagePickerAsync}
},
{
text: "Cancel",
onPress: () => console.log("Cancel Pressed"),
style: "cancel"
},
],
{ cancelable: false }
);}
} />
</View>
);
}
I took the code from expo snack: https://snack.expo.io/#trinet/sharing
Any help would be greatly appreciated. I'm really stuck
I had the same experience, in my case, it was due to some wrong header config, Content-Disposition inline instead of an attachment, so what happened is that inline attribute makes it render the content in the web page whereas attachment sees a file and tries to download it without previewing.
Add this in the header config of the file on the server and you will be file.
Credits to this SO answer and this
I am creating a slide bar, In that, I have used the react-redux library. When I call the class which contains the redux-code, it works fine. I want to show this slide bar after login. Therefore, with conditions (I set a state variable if user login successfully then only this page should get rendered), I tried to call the same file which shows a blank page. I printed the console log. I am able to print all the logs. But with conditions, I am not able to load the data.
I don't know much about react-redux.Can you assist me to resolve this?
My code is,
main.js,
import React, {Component} from 'react';
import {
StyleSheet,
Dimensions,
Platform,
View,
StatusBar,
DrawerLayoutAndroid,
} from 'react-native';
import { createStore } from 'redux';
import { Provider } from 'react-redux';
import reducer from '../Redux/reducers';
import { setNavigator, setActiveRoute } from "../Redux/actions";
import DrawerContent from '../Navigation/DrawerContent';
import Toolbar from '../Navigation/Toolbar';
import AppNavigation from '../Navigation/AppNavigation';
import { bgStatusBar, bgDrawer } from '../global.styles';
let store = createStore(reducer);
/* getDrawerWidth Default drawer width is screen width - header width
* https://material.io/guidelines/patterns/navigation-drawer.html
*/
const getDrawerWidth = () => Dimensions.get('window').width - (Platform.OS === 'android' ? 56 : 64);
export default class Main extends Component {
constructor() {
super();
this.drawer = React.createRef();
this.navigator = React.createRef();
}
componentDidMount() {
store.dispatch(setNavigator(this.navigator.current));
}
openDrawer = () => {
this.drawer.current.openDrawer();
};
closeDrawer = () => {
this.drawer.current.closeDrawer();
};
getActiveRouteName = navigationState => {
if (!navigationState) {
return null;
}
const route = navigationState.routes[navigationState.index];
// dive into nested navigators
if (route.routes) {
return getActiveRouteName(route);
}
return route.routeName;
};
render() {
return (
<Provider store={store}>
<DrawerLayoutAndroid
drawerWidth={getDrawerWidth()}
drawerPosition={DrawerLayoutAndroid.positions.Left}
renderNavigationView={
() => <DrawerContent closeDrawer={this.closeDrawer} />
}
ref={this.drawer}
>
<View style={styles.container}>
<StatusBar
translucent
animated
/>
<Toolbar showMenu={this.openDrawer} />
<AppNavigation
onNavigationStateChange={(prevState, currentState) => {
const currentScreen = this.getActiveRouteName(currentState);
store.dispatch(setActiveRoute(currentScreen));
}}
ref={this.navigator}
/>
</View>
</DrawerLayoutAndroid>
</Provider>
);
}
}
Login.js
import Main from './main';
render() {
return (
<View>
{this.state.isLoggedIn ?
<Main/>
:
<ChangePassword isUpdatePassword={this.state.isUpdatePassword} callLogin={this.callLogin}/>
);
}
}
If I just call Main class inside render method it works. But It does not work with conditions.
in a handleClick function, update the rootSiblings like this,
handleClick() { this.progressBar.update( <ProgressBar /> ); }
and in ProgressBar component,
import React, { PropTypes } from 'react';
import { connect } from 'react-redux';
import { View } from 'react-native';
const getFinishedWidth = progress => ({ width: progress * totalWidth });
const getUnfinishedWidth = progress => ({ width: (1 - progress) * totalWidth });
function CustomerReassignProgressBar(props) {
const { progress } = props;
return (
<View style={styles.bar}>
<View style={getFinishedWidth(progress)} />
<View style={getUnfinishedWidth(progress)} />
</View> );
}
CustomerReassignProgressBar.propTypes = { progress: PropTypes.number, };
const mapStateToProps = state => ({ progress: state.batchReassignProgress, });
export default connect(mapStateToProps)(ProgressBar);
then, when calling handleClick(), the app crushed, the error is, 'Could not find "store" in either the context or props of "Connect(ProgressBar)". Either wrap the root component in a , or explicitly pass "store" as a prop to "Connect(ProgressBar)".'
if I don't use connect in component, it works well. So, I guess, maybe rootSiblings can not work with react-redux. But does anyone knows this problem?
Upgrade to react-native-root-siblings#4.x
Then
import { setSiblingWrapper } from 'react-native-root-siblings';
import { Provider } from 'react-redux';
const store = xxx;// get your redux store here
// call this before using any root-siblings related code
setSiblingWrapper(sibling => (
<Provider store={store}>{sibling}</Provider>
));