I'm using webview in an Android application. I am trying to download a .pdf file, however when the link is clicked through the application the .pdf file name is changed to "1rcPnhg9_rSes92BiQPotVjXuEAfFnyrf.pdf", and is not saved with the original file name.

How to make webview save the file with the original name? At the moment the webview is saving the file using the ID as the name.

Used link: https://drive.google.com/uc?export=download&id=1rcPnhg9_rSes92BiQPotVjXuEAfFnyrf

WebView:

webView.setDownloadListener(new DownloadListener()
        {
            @Override
            public void onDownloadStart(String url, String userAgent,
                                        String contentDisposition, String mimeType,
                                        long contentLength) {
                DownloadManager.Request request = new DownloadManager.Request(
                        Uri.parse(url));
                request.setMimeType(mimeType);
                String cookies = CookieManager.getInstance().getCookie(url);
                request.addRequestHeader("cookie", cookies);
                request.addRequestHeader("User-Agent", userAgent);
                request.setDescription("Downloading File...");
                request.setTitle(URLUtil.guessFileName(url, contentDisposition, mimeType));
                request.allowScanningByMediaScanner();
                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                request.setDestinationInExternalPublicDir(
                        Environment.DIRECTORY_DOWNLOADS, URLUtil.guessFileName(
                                url, contentDisposition, mimeType));
                DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
                dm.enqueue(request);
                Toast.makeText(getApplicationContext(), "Downloading File", Toast.LENGTH_LONG).show();
            }});

Permissions in Manifest:

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />
<uses-permission android:name="android.permission.ACCESS_DOWNLOAD_MANAGER"/>

CodePudding user response：

Here a test with your link (in Kotlin). If you need a Java example, please, let me know:

private fun test() {
    webView = findViewById(R.id.webView)

    webView.webViewClient = object : WebViewClient() {
        override fun shouldOverrideUrlLoading(view: WebView, url: String): Boolean {
            Log.d(TAG, "shouldOverrideUrlLoading:url = ${url}")
            if (url.contains("=download")){
                Log.d(TAG, "shouldOverrideUrlLoading: ")
                downloadFile(url)
                webView.stopLoading()
            }
            return true
        }
    }
    val url = "https://drive.google.com/uc?export=download&id=1rcPnhg9_rSes92BiQPotVjXuEAfFnyrf"
    webView.loadUrl(url)
}

fun downloadFile(url: String) {
    Log.d(TAG, "downloadFile: url = $url")
    val manager = getSystemService(Activity.DOWNLOAD_SERVICE) as DownloadManager
    val uri =
        Uri.parse(url)
    val request = DownloadManager.Request(uri)
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
    val reference: Long = manager.enqueue(request)
}

image abuot download

Java code:

    private void test() {

    webView = findViewById(R.id.webView);

    webView.setWebViewClient(new WebViewClient(){
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            if(url.contains("=download")){
                downloadFile(url);
            }

            return super.shouldOverrideUrlLoading(view, url);
        }
    });

    String url = "https://drive.google.com/uc?export=download&id=1rcPnhg9_rSes92BiQPotVjXuEAfFnyrf";
    webView.loadUrl(url);
}

private void downloadFile(String url) {
    DownloadManager manager = (DownloadManager) getSystemService(Activity.DOWNLOAD_SERVICE);
    Uri uri = Uri.parse(url);
    DownloadManager.Request request = new DownloadManager.Request(uri);
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
    manager.enqueue(request);
}

CodePudding user response：

An option to use DownloadManager

For this you sould add an onNavigating event to your WebView. If the user target a pdf file you can stop the loading process with: ags.Cancel = true And this point when you can pass the url to a DownloadManager what will download your file.

CodePudding user response：

Here a simple code

webView.webViewClient = object : WebViewClient() {
        override fun shouldOverrideUrlLoading(view: WebView, url: String): Boolean {
            if (url.contains(".pdf")){
                downloadFile(url)
            }
            return false
        }
    }

    fun downloadFile(url: String) {
    Log.d(TAG, "downloadFile: url = $url")
    val manager = getSystemService(Activity.DOWNLOAD_SERVICE) as DownloadManager
    val uri =
        Uri.parse(url)
    val request = DownloadManager.Request(uri)
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
    val reference: Long = manager.enqueue(request)
}