Saving an image to a variable in React Native by using a URL

Is it possible to save an image from a URL into a variable and then use it in the Image component? In the code snippet provided below, the image is loaded directly, but I would like to create a function that stores the image in a variable for offline use.

import React from 'react';
import { View, Image, StyleSheet } from 'react-native';

const styles = StyleSheet.create({
  container: {
    paddingTop: 50,
  },
  tinyLogo: {
    width: 50,
    height: 50,
  },
  logo: {
    width: 66,
    height: 58,
  },
});

const DisplayAnImage = () => {
  return (
    <View style={styles.container}>
    
      <Image
        style={styles.tinyLogo}
        source={{
          uri: 'https://reactnative.dev/img/tiny_logo.png',
        }}
      />
   
     
    </View>
  );
}

export default DisplayAnImage;

Answer №1

No need to store the URL in a variable for future use.

You can directly assign the URL to a variable like this:

const imageURL = 'https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.laramind.com%2Fblog%2Fpercorso-react-native-dal-livello-base-al-livello-avanzato%2F&psig=AOvVaw2Kb7DOrxfQ9hHdyuf-9m49&ust=1626099973147000&source=images&cd=vfe&ved=0CAoQjRxqFwoTCLDDv8yc2_ECFQAAAAAdAAAAABAD'

Then you can easily use it in your image component:

<Image src={{uri: imageURL}}/>

If you want to use the image offline, consider using an external library such as rn-fetch-blob. Here's an example app demonstrating how to do it:

// Instructions on downloading an image in React Native from any URL
// https://aboutreact.com/download-image-in-react-native/

// Import React
import React from 'react';

// Import Required Components
import {
  StyleSheet,
  Text,
  View,
  TouchableOpacity,
  PermissionsAndroid,
  Image,
  Platform,
} from 'react-native';

// Import RNFetchBlob for file download
import RNFetchBlob from 'rn-fetch-blob';

const App = () => {
  const REMOTE_IMAGE_PATH =
    'https://raw.githubusercontent.com/AboutReact/sampleresource/master/gift.png'
  const checkPermission = async () => {
    
    // Check platform and perform appropriate action

    if (Platform.OS === 'ios') {
      downloadImage();
    } else {
      try {
        const granted = await PermissionsAndroid.request(
          PermissionsAndroid.PERMISSIONS.WRITE_EXTERNAL_STORAGE,
          {
            title: 'Storage Permission Required',
            message:
              'App needs access to your storage to download Photos',
          }
        );
        if (granted === PermissionsAndroid.RESULTS.GRANTED) {
          console.log('Storage Permission Granted.');
          downloadImage();
        } else {
          alert('Storage Permission Not Granted');
        }
      } catch (err) {
        console.warn(err);
      }
    }
  };

  const downloadImage = () => {
    let date = new Date();
    let image_URL = REMOTE_IMAGE_PATH;
    let ext = getExtention(image_URL);
    ext = '.' + ext[0];
    const { config, fs } = RNFetchBlob;
    let PictureDir = fs.dirs.PictureDir;
    let options = {
      fileCache: true,
      addAndroidDownloads: {
        useDownloadManager: true,
        notification: true,
        path:
          PictureDir +
          '/image_' + 
          Math.floor(date.getTime() + date.getSeconds() / 2) +
          ext,
        description: 'Image',
      },
    };
    config(options)
      .fetch('GET', image_URL)
      .then(res => {
        console.log('res -> ', JSON.stringify(res));
        alert('Image Downloaded Successfully.');
      });
  };

  const getExtention = filename => {
    return /[.]/.exec(filename) ?
             /[^.]+$/.exec(filename) : undefined;
  };

  return (
    <View style={styles.container}>
      <View style={{ alignItems: 'center' }}>
        <Text style={{ fontSize: 30, textAlign: 'center' }}>
          React Native Image Download Example
        </Text>
        <Text
          style={{
            fontSize: 25,
            marginTop: 20,
            marginBottom: 30,
            textAlign: 'center',
          }}>
          www.aboutreact.com
        </Text>
      </View>
      <Image
        source={{
          uri: REMOTE_IMAGE_PATH,
        }}
        style={{
          width: '100%',
          height: 100,
          resizeMode: 'contain',
          margin: 5
        }}
      />
      <TouchableOpacity
        style={styles.button}
        onPress={checkPermission}>
        <Text style={styles.text}>
          Download Image
        </Text>
      </TouchableOpacity>
    </View>
  );
};

export default App;

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  button: {
    width: '80%',
    padding: 10,
    backgroundColor: 'orange',
    margin: 10,
  },
  text: {
    color: '#fff',
    fontSize: 20,
    textAlign: 'center',
    padding: 5,
  },
});

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