Make a USSD call in Xamarin Crossplatform app

Issue

I want to make a USSD call in a xamarin crossplatform app using C# and i have no idea where to start. All the examples i have seen is done in java. Is it possible to successfully dial a USSD code like *270# within my app without opening the dialer? If yes, please how? I'll be very grateful for any help

Solution

To do it with Xamarin forms you have to create a custom renderer for android :

Create an interface in your shared project :

public interface IUssdRenderer
{
    void StartTransaction();
}

then in your android project :

using System; using Android.Content; using Android.OS; using ussd.Renderers;

[assembly: Xamarin.Forms.Dependency(typeof(IUssdRenderer))] namespace ussd.Droid.Renderers { public class UssdRenderer : IUssdRenderer { public Android.Net.Uri createUriFromString(string ussd) {

        String uri = "tel:";
        foreach (char c in ussd.ToCharArray())
        {
            if (c == '#')
            {
                uri += Android.Net.Uri.Encode("#");
            }
            else
            {
                uri += c;
            }
        }
        return Android.Net.Uri.Parse(uri);
    }

    public void StartTransaction()
    {
        var intent = new Intent(Intent.ActionCall, createUriFromString("*270#"));
        Context ctx = Xamarin.Forms.Forms.Context;
        ctx.StartActivity(intent);
    }
}
}

You'll also have to register you interface, I'm using prism :

    public void RegisterTypes(IContainerRegistry containerRegistry)
    {
        containerRegistry.Register< IUssdRenderer, UssdRenderer>(); 
    }

The last bit is to make sure you have Call permissions enabled :

Right click on Android Project > Options > Android application

make sure CallPhone is selected

Answered By - LeRoy