How to open maps Application from InAppWebView - Flutter

Question

I am opening a website using the Flutter InAppWebView.

           child: InAppWebView(
                  initialUrlRequest: URLRequest(
                    url: Uri.parse("https://mywebsite.com"),
                  ),
                  androidOnGeolocationPermissionsShowPrompt:
                      (InAppWebViewController controller, String origin) async {
                    return GeolocationPermissionShowPromptResponse(
                        origin: origin,
                        allow: true,
                        retain: true
                    );
                  },
                  initialOptions: options,
                  onWebViewCreated: (InAppWebViewController controller) {
                    _webViewController = controller;
                  },
                  androidOnPermissionRequest: (InAppWebViewController controller, String origin, List<String> resources) async {
                    return PermissionRequestResponse(resources: resources, action: PermissionRequestResponseAction.GRANT);
                  }
              ),

This website calls a URL:https://www.google.com/maps/search/?api=1&query=$latitude,$longitude' on button click.

This doesn't open the Application and rather continues in the InAppWebView. How do I resolve this?

Sadly no @ApurvaAgrawal, I had to do some workaround tweak to the UI. — Viral Panchal
– Viral Panchal, Commented Jul 11, 2022 at 7:51

itsgrimace · Accepted Answer · 2024-08-15 00:30:28Z

I know how you can handle this one.

you need to parse the URL and launch an app where possible. This is easy enough if you've done the basic setup so;

import 'package:url_launcher/url_launcher.dart';

This is required to launch the maps app where applicable. The standard sample is;

shouldOverrideUrlLoading:
    (controller, navigationAction) async {
    var uri = navigationAction.request.url!;

    if (![
        "http",
        "https",
        "file",
        "chrome",
        "data",
        "javascript",
        "about"
    ].contains(uri.scheme)) {
         if (await canLaunchUrl(uri)) {
             // Launch the App
             await launchUrl(
                 uri,
             );
             // and cancel the request
             return NavigationActionPolicy.CANCEL;
         }
    }
    return NavigationActionPolicy.ALLOW;
},

we want to look at the url and launch where a map is required. So to that end I've added this before the final return.

    if(uri.toString().contains("maps.google")){
        if (await canLaunchUrl(uri)) {
             // Launch the App - should be maps if installed
             await launchUrl(
                 uri,
             );
             // and cancel the request
             return NavigationActionPolicy.CANCEL;
         }
    }

Hope this helps anyone stuck.

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