In React Native, the WebView component does not support direct download of Blob URL content. The WebView is mainly designed for rendering web content and does not provide built-in functionality for handling downloads.

To enable downloading of Blob URL content in a React Native app, you'll need to implement a custom solution using the WebView's onMessage prop and a combination of web and native code. Here's a general outline of how you can achieve this:

  1. Web (JavaScript) Part: In the WebView, create a download link using an anchor tag (<a>) and set its href attribute to the Blob URL you want to download. When the user clicks on the link, use the WebView's postMessage method to send a message to the React Native side indicating that the download should start.

    html
    <WebView source={{ uri: 'your_webpage_with_blob_url' }} onMessage={(event) => handleDownload(event.nativeEvent.data)} />
    javascript
    function handleDownload(data) { if (data === 'startDownload') { const blobUrl = 'your_blob_url'; const downloadLink = document.createElement('a'); downloadLink.href = blobUrl; downloadLink.download = 'downloaded_file_name'; downloadLink.click(); } }
  2. React Native Part: In your React Native code, handle the message sent from the WebView and trigger the download process. You can use the react-native-fetch-blob or rn-fetch-blob library to download the Blob URL content and save it locally on the device.

    javascript
    import { WebView } from 'react-native-webview'; import RNFetchBlob from 'rn-fetch-blob'; function MyWebView() { function onMessage(event) { if (event.nativeEvent.data === 'startDownload') { downloadFile(); } } async function downloadFile() { const blobUrl = 'your_blob_url'; const response = await RNFetchBlob.config({ fileCache: true, }).fetch('GET', blobUrl); const savedPath = response.path(); // Use the savedPath for further processing or display a success message to the user } return ( <WebView source={{ uri: 'your_webpage_with_blob_url' }} onMessage={onMessage} /> ); }

    Note: Make sure to install and link the rn-fetch-blob or react-native-fetch-blob library in your React Native project before using it.

With this approach, when the user clicks the download link in the WebView, a message will be sent to the React Native side. React Native will then initiate the download process using the Blob URL and save the downloaded content locally on the device.

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