Develop Reference

Native-Base Component Picker issue

The app is crashing while i Load this component in the view. It used to working before.
import {Picker, View} from 'native-base';
<View style={{flex:1}}>
<Picker mode="dropdown">
<Picker.Item label="Select" value={0} />
<Picker.Item label="Veg" value={0} />
<Picker.Item label="Non-Veg" value={0} />
</Picker>
</View>

it seems like native base picker has a dependency for #react-native-community/picker
try to install it via
npm install #react-native-community/picker
npx pod-install
once installed it will fix the issue for you

Bug in react-native-vector-icons, Icons is in japanese

I have a react-native app.
I have an app but when i use icons(react-native-vector-icons) the icon show in japanese, example:
The icon that i want to use is "add"
Icon
But when i show the icon on my app that show like this:
bug
The code of this app is:
Code
Code:
const App = () => {
return (
<>
<StatusBar barStyle="dark-content" />
<SafeAreaView>
<ScrollView
contentInsetAdjustmentBehavior="automatic"
style={styles.scrollView}>
<Header />
<View style={styles.body}>
<View style={styles.sectionContainer}>
<Text style={styles.sectionTitle}>Step One</Text>
<Text style={styles.sectionDescription}>
Edit <Text style={styles.highlight}>App.js</Text> to change this
screen and then come back to see your edits.
<Icon name="add" color="#000" size={22} />
</Text>
</View>
</ScrollView>
</SafeAreaView>
</>
);
};
});
React-native Doctor:
Common
✓ Node.js
✓ yarn
Android
✖ JDK
- Version found: 1.8.0_265
- Version supported: >= 8
✖ Android Studio - Required for building and installing your app on Android
✓ Android SDK - Required for building and installing your app on Android
✓ ANDROID_HOME
Errors: 2
Warnings: 0
Usage
› Press f to try to fix issues.
› Press e to try to fix errors.
› Press w to try to fix warnings.
› Press Enter to exit.

got same issue.Follow this instruction :
Edit android/app/build.gradle ( NOT android/build.gradle ) and add the following:
apply from: "../../node_modules/react-native-vector-icons/fonts.gradle"
And rebuild.

React Native WebView video not playing in iOS

I developed mobile app which has video player in react native.
Then I built both Android and iOS app from the react native project.
But it's working well in Android but not playing in iOS.
If you've ever experienced this problem, please help me.
This is code and package information.
<WebView
allowsFullscreenVideo={true}
style={{ aspectRatio: 1.6, backgroundColor: "#000000", flex: 1 }}
source={{ uri: 'https://sample.mp4' }}
/>
"react": "16.9.0",
"react-native": "0.61.5",
"react-native-webview": "^8.0.3",

This code works for me in android and ios
<View style={{ height: 300 }}>
<WebView
style={{flex: 1.0}}
javaScriptEnabled={true}
domStorageEnabled={true}
source={{uri: 'http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4' }}/>
</View>

FlatList automatically scrolls to first when data is too large in horizontal mode (RTL)

Environment
System:
OS: Windows 10
CPU: (4) x64 Intel(R) Core(TM) i5-7400 CPU # 3.00GHz
Memory: 1.35 GB / 7.87 GB
Binaries:
Node: 10.15.3 - C:\Program Files\nodejs\node.EXE
Yarn: 1.17.3 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
npm: 6.4.1 - C:\Program Files\nodejs\npm.CMD
IDEs:
Android Studio: Version 3.5.0.0 AI-191.8026.42.35.5791312
React Native version: 0.60.4
Code
<FlatList
style={{
flexDirection: 'row',
marginHorizontal: -wp('3%'),
zIndex: 40
}}
initialNumToRender={10}
data={this.state.data}
horizontal={true}
key={item => item.groupNo}
keyExtractor={(item, index) => index.toString()}
showsHorizontalScrollIndicator={false}
showsVerticalScrollIndicator={false}
ref={ref => (this.flatList = ref)}
renderItem={({ item }) => (
<Item item={item} />
)}
/>
Steps To Reproduce
Added some data to my FlatList
Add horizontal={true} property to flatlist
Set I18nManager.allowRTL(true)
Set I18nManager.forceRTL(true)
Make my renderItem component extend as PureComponent.
Using Real Android Device
As you see below when my app is running on RTL direction FlatList automatically scrolls to top/first of the list but LTR direction is OK!
RTL:
LTR:

I also have a same this problem, and my solution (you add them in your Flatlist).
Hope help you.
This link maybe help you improve your list:
https://github.com/filipemerker/flatlist-performance-tips
getItemLayout={(data, index) => (
{ length: LECTURE_ITEM_HEIGHT, offset: LECTURE_ITEM_HEIGHT * index, index }
)}
maxToRenderPerBatch={20}
initialNumToRender={10}
windowSize={10}
removeClippedSubviews={true}

it's a major issue, also causes a problem with react-native-calendars.
for now, you can check onScroll event, on init it causes major scroll event, you can simply return false there and block the scroll.
I hope a better solution will come in the next verisons.

try to make the trick as explained in example with onEndReached method.
https://snack.expo.io/r1NMSxFwr
Also try to play with initialNumToRender.

the best and easy way is to install this npm
https://www.npmjs.com/package/react-native-autoscroll-flatlist

Webview not showing any content(html) react native

Contents did showing up perfectly inside emulator and debug with real device but does not showing anything when testing out with real device (using released .apk). It just only showed blank container with white color. Or do i missed something?
<WebView
ref={(wView) => {this.wView = wView}}
javaScriptEnabled={true}
// onBridgeMessage={this.onBridgeMessage}
onMessage={this.onMessage}
injectedJavaScript="window.postMessage = String(Object.hasOwnProperty).replace('hasOwnProperty', 'postMessage');"
automaticallyAdjustContentInsets={false}
domStorageEnabled={true}
startInLoadingState={true}
source={mainHtml} <-- load with, var mainHtml = require('./MainHtml.html');
style={{width: 320,height:100,flex: 1}}/>
Environment
react-native-cli: 2.0.1
react-native: 0.43.4
react: 16.0.0-alpha.6
Device(ASUS Zenfone)
Android version 6.0.1

From what I've read here this is a known issue with Android when deploying in Release. The workaround is to point to the file with a uri:
{ uri: 'file:///pathto/file.html' }