I'm developing an app with React Native and I'm testing with my OnePlus 6 and it has a notch. The SafeAreaView is a solution for the iPhone X but for Android, it seems there is no solution.
How to solve this kind of issue?
Do something like
import { StyleSheet, Platform, StatusBar } from "react-native";
export default StyleSheet.create({
AndroidSafeArea: {
flex: 1,
backgroundColor: "white",
paddingTop: Platform.OS === "android" ? StatusBar.currentHeight : 0
}
});
And then In your App.js
import SafeViewAndroid from "./components/SafeViewAndroid";
<SafeAreaView style={SafeViewAndroid.AndroidSafeArea}>
<Layout screenProps={{ navigation: this.props.navigation }} /> //OR whatever you want to render
</SafeAreaView>
This should work good as get height will take care of the knotch in android device by calculating the statusBar height and it will arrange accordingly.
A work around I had to use recently:
GlobalStyles.js:
import { StyleSheet, Platform } from 'react-native';
export default StyleSheet.create({
droidSafeArea: {
flex: 1,
backgroundColor: npLBlue,
paddingTop: Platform.OS === 'android' ? 25 : 0
},
});
It is applied like so:
App.js
import GlobalStyles from './GlobalStyles';
import { SafeAreaView } from "react-native";
render() {
return (
<SafeAreaView style={GlobalStyles.droidSafeArea}>
//More controls and such
</SafeAreaView>
);
}
}
You'll probably need to adjust it a bit to fit whatever screen you're working on, but this got my header just below the icon strip at the top.
Late 2020 answer: For anyone stumbling across this issue themselves, they have added support for this.
Follow this documentation page
You could also create helper component with this style applied right away like this
import React from 'react';
import { StyleSheet, Platform, StatusBar, SafeAreaView } from 'react-native';
export default props => (
<SafeAreaView style={styles.AndroidSafeArea} {...props} >
{props.children}
</SafeAreaView>
);
const styles = StyleSheet.create({
AndroidSafeArea: {
paddingTop: Platform.OS === 'android' ? StatusBar.currentHeight : 0
}
});
Make note that I also deleted unnecessary styles which breaks natural behavior of SafeAreaView which in my case broke styling.
As for use you simply use it like normal SafeAreaView:
import React from 'react';
import SafeAreaView from "src/Components/SafeAreaView";
render() {
return (
<SafeAreaView>
// Rest of your app
</SafeAreaView>
);
}
}
for more consistency import:
import { Platform, StatusBar } from "react-native";
and then use it like so:
paddingTop: Platform.OS === 'android' ? StatusBar.currentHeight : 0
if you're seeing this in 2020 and you also need the web support with the Android and iOS, type this in your terminal.
expo install react-native-safe-area-context
this will install the updated safe area context.
Then import the following stuffs into your app.js
import { SafeAreaView, SafeAreaProvider} from "react-native-safe-area-context";
add <SafeAreaProvider> before all the tags in your main function in app.js, also remember to close it at the end.
and finally, instead of view, add SafeAreaView.
Read more at the official expo website : SafeAreaContext
Although the docs says it is relevant only for iOS, when I used React's SafeAreaView it acted differently on different screens on Android.
I managed to fix the problem by implementing my version of SafeAreaView:
import React from "react";
import { Platform, View, StatusBar } from "react-native";
import { GeneralStyle } from "../styles";
export function SaferAreaView({ children }) {
if (Platform.OS == "ios") {
return <SaferAreaView style={{ flex: 1 }}>{children}</SaferAreaView>;
}
if (Platform.OS == "android") {
return <View style={{flex: 1, paddingTop: StatusBar.currentHeight}}>{children}</View>;
}
}
This was tested on an old device (with hardware navigation) and new notch devices (with software navigation) - different screen sizes.
This is currently the best or easiest way to implement SafeAreaView on Android and ios for both vanilla RN and Expo.
import { SafeAreaView } from 'react-native-safe-area-context';
function SomeComponent() {
return (
<SafeAreaView>
<View />
</SafeAreaView>
);
}
1 - expo install expo-constants
2- and do like this for example
import React from "react";
import Constants from "expo-constants";
import { Text, StyleSheet, SafeAreaView, View } from "react-native";
export default function HeaderTabs({ style }) {
return (
<SafeAreaView style={[styles.screen, style]}>
<View style={[styles.view, style]}>
<Text>Hello this is status bar</Text>
</View>
</SafeAreaView>
);
}
const styles = StyleSheet.create({
screen: {
paddingTop: Constants.statusBarHeight,
flex: 1,
},
view: {
flex: 1,
},
});
Instead of using Platform API, you can use expo constants.
npm i expo-constants
then import it in your component as
import Constants from "expo-constants"
and then in the styles you can use it like this
const styles = StyleSheet.create({
container: {
paddingTop: Constants.statusBarHeight
} });
To see all the properties of Constants console log it you will find some more useful things.
Well, I had the same problem. I solved this using this lib React Native Status Bar Height, and I recommend because it´s a piece of cake to use.
And if you are using style-components you can add the getStatusBarHeight() on your styles.js like I did on the example below:
import styled from 'styled-components/native';
import { getStatusBarHeight} from 'react-native-status-bar-height';
export const Background = styled.View`
flex:1;
background:#131313;
margin-top: ${getStatusBarHeight()};
`
In the SafeAreaView Docs was told:
It is currently only applicable to iOS devices with iOS version 11 or later.
So now I definitely use it in my project but I use Platform to recognize device platform and for Android, I make a manual safe area for the status bar.
you can use react-native-device-info for device info and apply styling also with a notch
I used StatusBar from react-native instead of expo-status-bar and this worked for me on my OnePlus as well as other Android devices.
import { StatusBar } from 'react-native';
Expo solution(docs - android only):
import { setStatusBarTranslucent } from 'expo-status-bar';
Then in the component you can use useEffect hook:
useEffect(() => {
setStatusBarTranslucent(false)
},[])
for iOS you can use the <SafeAreaView> component from react-native.
ENRICO SECCO was right (i cant comment due to my stackoverflow reputation lol)! any safeareaview thingy doesn't work for me as well, so i get around with
import { getStatusBarHeight} from 'react-native-status-bar-height';
here how execute it, keep in mind that this is in my app.js, where i put all my stack.navigator + bottomtab.navigator
export default function App() {
//IGNORE ALL OF THIS, JUMP TO THE RETURN() FUNCTION!
const [appIsReady, setAppIsReady] = useState(false);
useEffect(() => {
async function prepare() {
try {
await SplashScreen.preventAutoHideAsync();
await Font.loadAsync(AntDesign.font);
await Font.loadAsync({
'Montserrat-Bold': require('./assets/fonts/Montserrat-Bold.ttf'),
'Montserrat-Regular': require('./assets/fonts/Montserrat-Regular.ttf'),
'Montserrat-Light': require('./assets/fonts/Montserrat-Light.ttf'),
});
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) {
await SplashScreen.hideAsync();
}
}, [appIsReady]);
if (!appIsReady) {
return null;
}
return (
//HERE!
<NavigationContainer>
<View style = {{
flex: 1, <- TO MAKE IT FULL SCREEN (PLEASE DELETE THIS)
marginTop: getStatusBarHeight(), <- TO PUSH IT DOWN FROM OFF SCREEN, MINE RAN OFF TO THE TOP LMAO (PLEASE DELETE THIS)
}} onLayout={onLayoutRootView}>
<Tabs/>
</View>
</NavigationContainer>
);
}
Related
CMD:
react-native init Test && react-native run-android
App.js:
export default class App extends Component {
render() {
new Function("person", "const { firstname } = person; alert(firstname);")({ firstname: "Test" });
}
}
Whenever the new function gets constructed and invoked, the app crashes stating: "SyntaxError: Unexpected token '{'. Expected an identifier name in const declaration" Only happens on Android.
Any help would be appreciated. Thanks!
React Native: v0.55.7
The react native documentation indicates that JavaScriptCore is generally used at runtime (V8 during debugging), but it's light on specifics as to how it is configured. One thing it does mention is that the native JavaScriptCore is used on iOS, while a different version is bundled with the app for user on Android.
Because Babel is used at compile time with react native to support ES5/ES6 features, it may be that the runtime is configured at a lower level of support. So when attempting to create code from a string at runtime, you may actually be running with a JavaScript interpreter that doesn't understand e.g., destructuring syntax.
You could try using Babel's transform at runtime to transpile your code:
import {transform} from 'babel-core';
export default class App extends Component {
render() {
const f = 'const { firstname } = person; alert(firstname);';
const result = transform(f, {
presets: ['es2015']
});
new Function("person", result.code)({ firstname: "Test" });
}
}
Can you create a const with a dynamic name? If it's possible, sorry about my lack of knowledge about that subject.
The error message said that a name to variable const is expected.
I hope it has been useful.
Best regards.
Try to change the style you create that function. In React Native is common to see arrow functions, that must be created outside your render method.
Note that your render method will be trigger every single time that your state changes. and it would be a waste of memory resources and unnecessary computing time
import React, {
Component
} from 'react';
import {
Text,
View,
StyleSheet
} from 'react-native';
export default class App extends Component {
//your custom function
myFunc = (param) => {
console.log(param)
return param
}
//your render method
render() {
const param = "Im a text"
//you could do this... i would never do that..
const myFuncInRender = () => { console.log('Im a stupid func')}
const myStupidFunc2 = new Function("person", "const { firstname } = person; alert(firstname);")({ firstname: "Test" });
return (
<View style={styles.container}>
<Text style={styles.paragraph}>
{this.myFunc(param)/* HERE is where you call the func*/}
</Text>
</View>
);
}
} // end from Class
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
backgroundColor: '#ecf0f1',
padding: 8,
alignItems:'center',
},
paragraph: {
margin: 24,
fontSize: 18,
fontWeight: 'bold',
textAlign: 'center',
},
});
I am using React Navigation 2 for a simple RN project with Expo. I am trying to get the header and tabs on the bottom to display over a blurred background so I have done a HOC to wrap the library Header with a BlurView to provide that functionality. It renders the blur fine but unfortunately the title, back buttons etc. are lost in the process. Is there a way to do that in React Navigation, the code I use is as follows:
const wrappedHeader = props => (
<BlurView tint="light" intensity={80} style={styles.header}>
<Header {...props}/>
</BlurView>
);
class HomeScreen extends React.Component {
static navigationOptions = {
header: props => wrappedHeader(props),
headerTitle: "Home Screen",
};
....
}
This is a tricky question that truly got me thinking for awhile.
Here's the solution I've found to get a native iOS feeling for a tab bar navigator:
import React from 'react';
import { StyleSheet } from 'react-native';
import { BlurView } from 'expo';
import { BottomTabBar } from 'react-navigation-tabs';
const styles = StyleSheet.create({
blurView: {
position: 'absolute',
bottom: 0,
left: 0,
right: 0,
},
bottomTabBar: {
backgroundColor: 'transparent',
},
});
export default function TabBar(props) {
return (
<BlurView tint="light" intensity={90} style={styles.blurView}>
<BottomTabBar {...props} style={styles.bottomTabBar} />
</BlurView>
);
}
The problem seemed to be related to the BlurView styling.
Note: this code will only work after setting the tabBarComponent option on your navigator as the following:
export default createBottomTabNavigator({
// This part should be different on your side
Feed: FeedScreen,
Me: MeScreen,
Settings: SettingsScreen,
}, {
tabBarComponent: TabBar,
});
For the header, I guess it must be the same trick, but you would need to replace bottom: 0 with top: 0.
This is possibly just an Android 6.0 bug. I tested the snack below in Android 5.1.1 and Android 7.0 and it didn't happen there.
I am trying to do an autocomplete whenever the user types "#". I successfully do this, however once I backspace a couple times, the value on the native side becomes some value I never had before. I have simplified the case to this code below:
Please try the snack here - https://snack.expo.io/#noitsnack/what-the-heck---autocomplete-then-backspace-bug OR copy and paste the code into a new react-native init project. I tested in RN 0.51 and RN 0.54.
Please then type Hi #
You will see it autocompletes to Hi #foobar.
Then backspace once and it properly is now Hi #fooba.
Backspace again, and now it is Hi #foHi (this is the bug, it should be Hi #foob)
This is a controlled input. I have no idea why it's turning into Hi #foHi on second backspace. If I blur then come after step 3 it doesn't come back.
I tried on two other devices, Android 7.0 and Android 5.1.1, and this bug was not there. It only happened on my Android 6.0. I think this is a OS dependent bug. Does anyone have ideas on what is actually going on? That will help me on how to work around this on all devices.
Is this really a bug on RN side?
I recorded a screencast of this behavior here in HD:
https://gfycat.com/RectangularAltruisticEuropeanfiresalamander
Here is a GIF:
The code (copied from the expo snack):
import React, { Component } from 'react';
import { StyleSheet, Text, View, TextInput } from 'react-native'
class FieldMentionable extends Component<Props, State> {
state = {
value: ''
}
render() {
const { value } = this.state;
return <TextInput onChange={this.handleChange} value={value} multiline />
}
handleChange = ({ nativeEvent:{ text }}) => {
const { value } = this.state;
if (text.endsWith(' #')) this.setState(() => ({ value:text + 'foobar' }));
else this.setState(() => ({ value:text }));
}
handleRef = el => this.input = el;
}
export default class App extends Component {
render() {
return (
<View style={styles.container}>
<FieldMentionable />
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
paddingHorizontal: 100,
backgroundColor: '#F5FCFF',
}
});
This is a bug on and its root issue has been filed here - https://github.com/facebook/react-native/issues/19085
In my react-native project I'd like to generate barcode from given value. I found react-native-barcode-builder but I don't know how to use this library in android correctly. I've already install by npm install --save react-native-barcode-builder but when I want to import library in project I have following error:
undefined is not an object (evaluating 'undefined.hex')
I think I should link this library by react-native link but it doesn't change anything. Every sample is for Xcode, but I developing on Windows in WebStorm. Can anyone tell me how to correctly use this library?
This is my code:
import React, {Component} from 'react';
import {connect} from 'react-redux';
import Barcode from 'react-native-barcode-builder'
import Dimensions from 'Dimensions';
import {
StyleSheet,
View,
Image
} from 'react-native';
const DEVICE_WIDTH = Dimensions.get('window').width;
const DEVICE_HEIGHT = Dimensions.get('window').height;
class CardDetailsScreen extends Component {
render() {
return (
<View style={styles.container}>
<Image source={this.props.imageSource} style={styles.image}/>
<Barcode value="Hello world" format="EAN-13"/>
</View>
)
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
},
image: {
width: DEVICE_WIDTH,
height: 250,
}
});
const mapStateToProps = (state) => {
return {
card: state.card
};
};
const mapDispatchToProps = (dispatch) => {
return {
getCardData() {
console.log('test');
}
}
};
export default connect(mapStateToProps, mapDispatchToProps)(CardDetailsScreen);
Here you've got the answer: https://devhub.io/repos/wonsikin-react-native-barcode-builder
Before use react-native-barcode-builder run: npm install react-native-svg --save && react-native link react-native-svg and it should works.
If you want to test a library that creates EAN13 natively you may try react-native-barcode-creator:
npm install react-native-barcode-creator && cd ios && pod install
I'm trying to make the following example become fullscreen:
import React, { Component } from 'react';
import { AppRegistry, StyleSheet, Text, View, Alert } from 'react-native';
import BarcodeScanner from 'react-native-barcode-scanner-google';
export default class BarcodeApp extends Component {
render() {
return (
<View style={{
flex: 1
}}>
<BarcodeScanner
style={{
flex: 1
}}
onBarcodeRead={({data, type}) => {
// handle your scanned barcodes here!
// as an example, we show an alert:
Alert.alert(`Barcode '${data}' of type '${type}' was scanned.`);
}}
/>
</View>
);
}
}
AppRegistry.registerComponent('brcodegooglern', () => BarcodeApp);
The problem is: At the moment, on my physical device, the screen renders only at half of its size.
I also wish to place elements like text and image on top of the camera visualization screen.
How to accomplish that?
PS: I'm using react-native-barcode-scanner-google instead of react-native-camera because the performance of onBarcodeRead seems to be slightly better.