React Native FlatList with columns, Last item width

I'm using a FlatList to show a list of items in two columns

<FlatList style={{margin:5}}
  data={this.state.items}
  numColumns={2}
  keyExtractor={(item, index) => item.id }
  renderItem={(item) => <Card image={item.item.gallery_image_url} text={item.item.name}/> }
/>

The card component is just a view with some styles:

<View style={{ flex: 1, margin: 5, backgroundColor: '#ddd', height: 130}} ></View>

It is working fine, but if the number of items is odd, the last row only contains one item and that item stretches to the full width of the screen.

How can I set the item to the same width of the others?

for your case use flex: 1/2

therefore: Your item should have flex of 1/(number of columns) if you have 3 columns your item should have flex:1/3

Theres a few things you can try here.

A) Setting a pre-defined width for the card ( Maybe equal to the height you've set? ). Then you can use alignItems in order to have the card positioned in the middle or on the left - Unsure as to which you wanted here.

B) If there are an even number of cards, you could add an empty View at the end in order to fill this space. I find this method pretty clunky but useful when trying to leave space for future elements.

C) Simply use alignItems: 'space-between, i like to use this to center items, but you would have to define the width, or use something like flex:0.5

I suggest researching more into flexbox to help you with this, as it is hard to tell the context of this situation. I'm assuming the above methods will help, but if not, here are some links for you to look at -

First link

Second link

Third link _{Link Broken}

Hope this helps. If you need any further clarification - just ask

You can try to get the current width of the device via Dimensions, do some math based on the number of columns you want to render, minus off the margins and set that as the minWidth and maxWidth.

For example:

const {height, width} = Dimensions.get('window');
const itemWidth = (width - 15) / 2;

<View style={{ flex: 1, margin: 5, backgroundColor: '#ddd', minWidth: {this.itemWidth}, maxWidth: {this.itemWidth}, height: 130}} ></View>

This is the cleanest way to style a FlatList with columns and spaced evenly:

    <FlatList style={{margin:5}}
        numColumns={2}                  // set number of columns 
        columnWrapperStyle={style.row}  // space them out evenly
        
        data={this.state.items}
        keyExtractor={(item, index) => item.id }
        renderItem={(item) => <Card image={item.item.gallery_image_url} text={item.item.name}/> }
    />       

    const style = StyleSheet.create({
        row: {
            flex: 1,
            justifyContent: "space-around"
        }
    });

The reason for it is your Card have style flex: 1, so it will try to expand all the space remain. You can fix it by add maxWidth: '50%' to your Card style

<View style={{ flex: 1, margin: 5, backgroundColor: '#ddd', height: 130, maxWidth: '50%'}} ></View>

@Emilius Mfuruki suggestion is good, but if you have text with varying length it doesn't work perfectly. Then use this width inside your item view:

const {height, width} = Dimensions.get('window');
const itemWidth = (width - (MarginFromTheSide * 2 + MarginInBetween * (n-1))) / n;

In FlatList use:

columnWrapperStyle={{
            flex: 1,
            justifyContent: 'space-evenly',
          }}

Works perfectly.

I tried some of the solutions above but I still had some problems with the margins on the last item (2 columns list).

My solution was simply wrapping the item into a parent container, leaving the original container with flex: 1 and the parent container of the item with flex: 0.5 so it would take the margin correctly.

itemContainer: {
  flex: 0.5,
},
itemSubContainer: {
  flex: 1,
  marginHorizontal: margin,
},

The simplest solution is do the math. Imagine we have 2 View for each Row and we want to give 10 margin to every side it will look something like that:

As you see in the image above each View have 2 margins in horizontal. (inside of red rectangle) So we have to subtract the product of margin, number of column and 2 from the width.

import { Dimensions } from 'react-native';
const {width} = Dimensions.get("window")
const column = 2
const margin = 10
const SIZE = (width - (margin * column * 2)) / column
<View style={{ margin: 10, width: SIZE }} ></View>

You can use ListFooterComponent={this.renderFooter}

just use flex:0.5 and width:'50%'

Create an array with odd number of images in it, like:

const images = [
  require('./../...jpg'),
  require('./../...jpg'),
  require('./../...jpg'),
  require('./../...jpg'),
  require('./../...jpg'),
];

And then, use the code given below,

const App = () => {
const _renderItem = ({ item, index }) => (
  <Image
    source={item}
    style={{
      width: '50%',
      height: 200,
    }}
    resizeMode="cover"
  />
 );

return (
    <View style={{flex: 1, marginHorizontal: 10,}}>
      <FlatList
        columnWrapperStyle={{ justifyContent: 'space-between' }}
        keyExtractor={(_, index)=> index.toString()}
        data={images}
        numColumns={2}
        renderItem={_renderItem}
      />
    </View>
  )
};
export default App;

Working Example

I also faced the same problem.

So, you can just use this package.

It prevents that problem and some others by default.

Installation:

npm install grid-flatlist-react-native

Usage:

import GridFlatList from 'grid-flatlist-react-native';

<GridFlatList
  data={[1,2,3,4,5,6]}
  renderItem={(item) => (<Text>{item}</Text>)}
  gap={10} // spacing between items
  paddingHorizontal={10} // shadow around elements will not be clipped
/>