1-) FLUTTER - InAppWebView whatsapp telefon mail vs yönlendirme

1. BU EN İYİSİ

child: InAppWebView(

shouldOverrideUrlLoading:
      (controller, navigationAction) async {
    
    var uri = navigationAction.request.url!;
    String url = uri.toString().replaceAll("mail:", "mailto:");

    if (![
      "http",
      "https",
      "file",
      "chrome",
      "data",
      "javascript",
      "about"
    ].contains(uri.scheme)) {

      if (await canLaunch(url)) {
        await launch(
          url,

        );
        return NavigationActionPolicy.CANCEL;
      }
    }
    return NavigationActionPolicy.ALLOW;
  },
),

2. BUNADA BAKABİLİRSİN

 shouldOverrideUrlLoading:

                      (controller, navigationAction) async {

                    var uri = navigationAction.request.url!;

                    if(uri.toString().toLowerCase().contains("mail:")){

                      if (await canLaunch(uri.toString())) {

                        // Launch the App

                        await launch(uri.toString());

                        // and cancel the request

                        return NavigationActionPolicy.CANCEL;

                      }

                    }

                    if (uri.toString().toLowerCase().contains("://wa.me/") ||

                        uri.toString().toLowerCase().contains("://api.whatsapp.com/") ||

                        !uri.toString().toLowerCase().startsWith("http")) {

                      if (await canLaunch(uri.toString())) {

                        // Launch the App

                        await launch(uri.toString());

                        // and cancel the request

                        return NavigationActionPolicy.CANCEL;

                      }

                    }

                    return NavigationActionPolicy.ALLOW;

                  },