Im using react-native-video in my react-native application. I want to be able to dynamically change videosource but found out it wasnt that easy. My approach is simply by changing the clip name with a hook, changing video1 to video2. But I was not able to update the videoinstance:
I did try something like this:
const [clipSelected, setClipSelected] = useState('video1');
const onButton = (name) => {
console.log("videoname", name)
setClipSelected(name);
}
return (
<Fragment>
<View style={styles.container}>
<Video
source={require('./' + clipSelected + '.mp4')}
ref={(ref) => {
bgVideo = ref
}}
onBuffer={this.onBuffer}
onError={this.videoError}
rate={1}
repeat={true}
/>
<Button onPress={(e) => onButton('video2')}></Button>
</View>
</Fragment >
);
Are there any other library, approach or method anyone are aware of where I can solve this? Basically a way to update the source instance of the video. Im going to run this on an Android TV ...
Use the status values to make changes.
const [clipSelected, setClipSelected] = useState(false);
const onButton = () => {
setClipSelected(true);
}
...
<Video
source={clipSelected === false ? require('./video1.mp4') : require('./video2.mp4')}
...
<Button onPress={(e) => onButton()}></Button>
Related
I am using react-native-snap-carousel to swipe through images. When there is like 0-10 images it's working fine, but otherwise it's very laggy. I tried the optimization methods but didn't fix it.
Here is my implementation (selectedItems is the data I have):
const renderItem = useCallback(
({ item, index }) => {
return (
<CarouselImage
ad={ad}
item={item}
index={index}
showImage={showImage}
/>
);
},
[ad, showImage]);
return ad?.videos?.length > 0 || ad?.images?.length > 0 ? (
<View style={styles.container}>
<Carousel
initialNumToRender={selectedItems.length}
maxToRenderPerBatch={5}
ref={carouselRef}
swipeThreshold={5}
itemWidth={wp(375)}
data={selectedItems}
sliderWidth={wp(375)}
enableMomentum={false}
lockScrollWhileSnapping
renderItem={renderItem}
onSnapToItem={(index) => setActiveSlide(index)}
/>
<Pagination
activeOpacity={1}
tappableDots={true}
animatedDuration={100}
inactiveDotScale={0.4}
inactiveDotOpacity={0.4}
carouselRef={carouselRef}
dotStyle={styles.dotStyle}
activeDotIndex={activeSlide}
dotsLength={selectedItems.length}
containerStyle={styles.pagination}
dotContainerStyle={styles.dotContainer}
inactiveDotStyle={styles.inactiveDotStyle}
/>
</View>
Is there something I am missing. Also, is there an alternative library that runs better with large data ?
Try this alternative library: react-native-banner-carousel-updated
I'm using this with more than 20 images and it's works fine.
I'm assuming that the optimization you've tried is what is described in the react-native-snap-carousel library docs...
I too found that every swipe was causing my screen's component to re-render.
You might be thinking...
I think it has to do with the state I am updating each time I scroll the component is re-rendered. Do you have ant idea how to solve this ?
To prevent the re-rendering of your <Carousel ... /> component, the optimization that you want to look at is to utilize React.memo()
Try refactoring your <Carousel ... /> component to a new component file, something like this...
Gallery.js
import React from "react";
import CarouselCardItem, { SLIDER_WIDTH } from "./CarouselCardItem";
import { ALL_RECIPES } from "../config/Recipe/allRecipes";
import Carousel from "react-native-snap-carousel";
const Gallery = ({ carouselRef, selectedItems, setActiveSlide}) => {
console.log("render"); // <== This will render only when props change (ie. the ref - which should not change, or you pass fresh data - in which case you want it to re-render)
return (
<Carousel
initialNumToRender={selectedItems.length}
maxToRenderPerBatch={5}
ref={carouselRef}
swipeThreshold={5}
itemWidth={wp(375)}
data={selectedItems} // <== selectedItems could be passed in as prop, or from app state
sliderWidth={wp(375)}
enableMomentum={false}
lockScrollWhileSnapping
renderItem={renderItem}
onSnapToItem={(index) => setActiveSlide(index)}
/>
);
};
const GalleryMemo = React.memo(Gallery);
export default GalleryMemo;
Then in your screen file, use it
<GalleryMemo carouselRef={carouselRef} selectedItems={selectedItems} setActiveSlide={setActiveSlide}/>
We are facing some very weird issue with opening keyboard on Android device.
It works great on iOS, 90% on Android devices, but on some devices it simply don't work = the keyboard don't show despite the input field has focus.
We tried it with different approaches (with refs, with timeout and without ref either).
All with the same result :/. One of the devices we are trying has API 30, so it even doesn't seem to be an old API problem.
Have anybody facing similar issue? What can cause the issue? Any tips how to debug it?
Here is code:
export const AddNotificationModal: AddNotificationModalT = ({
visible,
category,
onCloseModal,
}) => {
const input = useRef<TextInput>(null);
...
useEffect(() => {
if (visible) {
// 1.
// InteractionManager.runAfterInteractions(() => {
// if (input?.current) {
// input.current.focus();
// }
// });
// 2.
input.current?.focus();
// 3.
// setTimeout(() => input.current?.focus(), 150);
}
}, [visible]);
return (
<Modal
name={AddNotificationModal.name}
visible={visible}>
...
<View>
<TextInput autoFocus={true} ref={input} />
<Button dark onPress={() => onConfirm()}>
{t('shared:buttons.safe')}
</Button>
</View>
</Modal>
);
};
I'm using a flatlist to render a feed of videos for my project. I want to prevent the videos from auto-playing when they're not visible on the screen.
I figured the simplest way to do this would be to see if the current video on the screen is currently visible/active and if so, I can set props to true for playing etc.
I'm having a lot of issues trying to achieve this however an I wanted to know if anyone can give me some pointers as I'm new to React-Native.
You can use onViewableItemsChanged prop from FlatList
Docs Here
Working Example of FlatList of Videos with automatic play/pause feature
Something as shown below
const [Viewable, SetViewable] = React.useState([]);
const ref = React.useRef(null);
const onViewRef = React.useRef((viewableItems) => {
let Check = [];
for (var i = 0; i < viewableItems.viewableItems.length; i++) {
Check.push(viewableItems.viewableItems[i].item);
}
SetViewable(Check);
});
const viewConfigRef = React.useRef({ viewAreaCoveragePercentThreshold: 80 });
<FlatList
data={Videos}
keyExtractor={(item) => item._id.toString()}
renderItem={({ item }) => <VideoPlayer {...item} viewable={Viewable} />}
ref={ref}
onViewableItemsChanged={onViewRef.current}
viewabilityConfig={viewConfigRef.current}
/>
How to solve blink image when back to first item in react-native-snap-carousel ? I try to look for many examples but fail all.
This is my script :
renderSlider ({item, index}) {
return (
<View style={styles.slide}>
<Image source={{uri: item.cover}} style={styles.imageSlider} />
</View>
);
}
<Carousel
ref={(c) => { this._slider1Ref = c; }}
data={data}
renderItem={this.renderSlider}
sliderWidth={width}
itemWidth={(width - 30)}
itemWidth={(width - 30)}
inactiveSlideScale={0.96}
inactiveSlideOpacity={1}
firstItem={0}
enableMomentum={false}
lockScrollWhileSnapping={false}
loop={true}
loopClonesPerSide={100}
autoplay={true}
activeSlideOffset={50}
/>
the comple documentation you can find here and about the plugin api you can find here.
Please anyone help me.
Thanks.
I had the same issue when loop={true} was set.
We came up with this workaround:
We maintained the activeSlide value in a state, and created a reference of Carousel refCarousel.
const [activeSlide, setActiveSlide] = useState(0);
const refCarousel = useRef();
Then we added code in useEffect to manually move the carousel item to the first one back when it reaches the end with a delay of 3500 milliseconds which is also set to autoplayInterval props.
This way, we achieved the looping effect.
useEffect(() => {
if (activeSlide === data.length - 1) {
setTimeout(() => {
refCarousel.current.snapToItem(0);
}, 3500)
}
}, [activeSlide]);
Below is the Carousel component declaration. Only the relevant props are shown here.
<Carousel
ref={refCarousel}
...
//loop={true}
autoplay={true}
autoplayDelay={500}
autoplayInterval={3500}
onSnapToItem={(index) => setActiveSlide(index)}
/>
use React Native Fast Image if you are facing blinking issue.
I set up a FlatList with an onRefresh function to update the state when the user drags down the screen. It works properly, however I was wondering how I can highlight items in the FlatList that have been updated after the refresh.
Say, for example, I want to change the background for a few seconds for any item in the list that was updated, then return to normal.
<FlatList
data={scores}
renderItem={({item}) => (
<View style={styles.scoreContainer}>
<ScoreRow data={item.away} />
<ScoreRow data={item.home} />
</View>
)}
keyExtractor={item => item.gameID}
refreshing={isRefreshing}
onRefresh={updateScores}
/>
The best I could do was add a useEffect in the ScoreRow component to detect if something changes within that component, but that only allows me to update one component at a time, not the entire View.
const [runUpdate, setRunUpdate] = useState(false)
const [runs, setRuns] = useState(data.R)
useEffect(() => {
if(runs !== data.R) {
setRunUpdate(true)
setRuns(data.R)
setTimeout(() => setRunUpdate(false), 10000)
}
}, [data.R])
I can't figure out how to detect a change on an an item in the View of the FlatList so that I can change the entire View the way I did each component.
You can achieve this by using data of FlatList. You have to make an extra parameter for this.
eg:
//Method to refresh data
_refreshMethod() {
// Do your code to fetch...
...
let newDataArray = data // Data fetch from server or some thing.
let updatedArray = []
newDataArray.map((data, index) => {
data["isNewItem"] = true;
updatedArray.push(data);
});
this.setState({scores: updatedArray})
this._callTimer()
}
// Method to update new item status after a delay
_callTimer() {
setTimeout(function() {
let updatedArray = []
this.state.scores.map((data, index) => {
data["isNewItem"] = false;
updatedArray.push(data);
});
this.setState({scores: updatedArray})
}, 3000); // The time you want to do...
}
Then change the style of row based on the state value.
<FlatList
data={this.state.scores}
renderItem={({item}) => (
<View style={item.isNewItem ? styles.yourNewItemStyle : styles.scoreContainer}>
<ScoreRow data={item.away} />
<ScoreRow data={item.home} />
</View>
)}
keyExtractor={item => item.gameID}
refreshing={isRefreshing}
onRefresh={updateScores}
extraData={this.state}
/>