How to send OnActivityResult To a specific page in xamarin forms - events

Question

I am using a custom button renderer for google sign In in xamarin forms page its working fine I get the signin resultin MainActivity Now i want to send this data from MainActivity and AppDelegate to the Particular page in Xamarin Forms.
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
if (requestCode == 9001)
{
Utilities.Configuration.UpdateConfigValue(Utilities.Constants.loggedInflag,string.Empty);
GoogleSignInResult result = Android.Gms.Auth.Api.Auth.GoogleSignInApi.GetSignInResultFromIntent(data);
if (result.IsSuccess)
{
GoogleSignInAccount acct = result.SignInAccount;
var token = acct.IdToken;
//I wan to send the 'accnt' to a Page in xamarin forms
}
else
{
//Signin Failure send response to Page in xamarin forms
}
}
}

Answer 1

Xamarin.Forms runs only in one Activity on Android. So if your url request comes out in a different Activity, you have to switch back to the MainActivity before you can use the normal XF navigation.
I do this when a user opens a file associated with my app.
[Activity(Label = "LaunchFileActivity")]
public class LaunchFileActivity : Activity
{
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
if (Intent.Data != null)
{
var uri = Intent.Data;
if (uri != null)
{
Intent i = new Intent(this, typeof(MainActivity));
i.AddFlags(ActivityFlags.ReorderToFront);
i.PutExtra("fileName", uri.Path);
this.StartActivity(i);
}
}
this.FinishActivity(0);
}
}
And in MainActivity:
protected override void OnNewIntent(Intent intent)
{
base.OnNewIntent(intent);
Intent = intent;
}
protected override void OnPostResume()
{
base.OnPostResume();
if (Intent.Extras != null)
{
string fileName = Intent.Extras.GetString("fileName");
if (!string.IsNullOrEmpty(fileName))
{
// do something with fileName
}
Intent.RemoveExtra("fileName");
}
}

Answer 2

Xamarin forms runs on one activity, which is most like your main activity.
There are two sample projects that show you how to communicate between native and form parts of the code, which can be found here
https://github.com/xamarin/xamarin-forms-samples/tree/master/Forms2Native
https://github.com/xamarin/xamarin-forms-samples/tree/master/Native2Forms
However, to answer your question, you would do something like the following
private const int MyRequestCode = 101;
//Start activity for result
var contactPickerIntent = new Intent(Intent.ActionPick, Android.Provider.ContactsContract.Contacts.ContentUri);
context.StartActivityForResult(contactPickerIntent, MyRequestCode);
and then in your main activity (the activity that initializes your xamarin forms application (using global::Xamarin.Forms.Forms.Init(this, bundle);)
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
if (requestCode == MyRequestCode && resultCode == Result.Ok)
{
}
}