<a class="thirdbox" href="/media/wysiwyg/pdf/systemaufbau-anleitungen.pdf" target="_blank" download="blizz-z_Systemaufbau_Anleitungen" title="Datei downloaden">
<div class="iconlink">
    <p>Systemaufbau Anwendungsbroschüre<br><span style="font-size: 75%;">(PDF 5,8 MB)</span></p>
</div>
</a>

myWebView.setWebViewClient(new WebViewClient() {

    ...

    // Give the host application a chance to take control when a URL is about to be loaded in the current WebView.
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url)
    {
        Log.i("debug_log", "shouldOverrideUrlLoading");

    // Allow download of .pdf files
        if (url.endsWith(".pdf")) {
            startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
            // if want to download pdf manually create AsyncTask here
            // and download file
            return true;
        }

    // Allow URL's starting with /
        if (url.startsWith("/")) {
            startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(website + url)));
            // if want to download pdf manually create AsyncTask here
            // and download file
            return true;
        }

    // Also allow urls not starting with http or https (e.g. tel, mailto, ...)
        if( URLUtil.isNetworkUrl(url) ) {
            return false;
        } else {
            startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
        }

        return true;
    }

});