无法从我的WebView在Whatsapp上共享。无法加载whatsapp://send?text=上的网页，因为net::ERR_UNKNOWN_URL_SCHEME

WebView webView = findViewById(R.id.webview);
webView.setWebViewClient(new WebViewClient() {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        if (url.startsWith("whatsapp://")) {
            try {
                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setData(Uri.parse(url));
                startActivity(intent);
                return true;
            } catch (ActivityNotFoundException e) {
                // WhatsApp not installed
                Toast.makeText(getApplicationContext(), "WhatsApp not installed.", Toast.LENGTH_SHORT).show();
                return false;
            }
        }
        return super.shouldOverrideUrlLoading(view, url);
    }
});