android如何在网页视图中下载PDF文件

<uses-permission android:name="android.permission.INTERNET" />

<WebView
    android:id="@+id/webview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

WebView webView = findViewById(R.id.webview);
webView.getSettings().setJavaScriptEnabled(true);
webView.setWebViewClient(new WebViewClient() {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
        String url = request.getUrl().toString();
        if (url.endsWith(".pdf")) {
            // 下载PDF文件
            DownloadManager.Request downloadRequest = new DownloadManager.Request(Uri.parse(url));
            downloadRequest.setMimeType("application/pdf");
            downloadRequest.setTitle("PDF Download");
            downloadRequest.setDescription("Downloading");
            downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
            downloadRequest.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "example.pdf");

            DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
            downloadManager.enqueue(downloadRequest);
            return true;
        }
        return super.shouldOverrideUrlLoading(view, request);
    }
});

webView.loadUrl("https://example.com/example.pdf");