How to make a method for whenever a user navigates to a page in Xamarin.Android

Question

In my Xamarin.Forms App, I want a method to only be triggered when an Android user goes to a certain page in my application. I know that there is an OnCreate() for the MainActivity.cs, but is there something like this for when a user navigates to a specified page in my Shared Project?

So the method would not be carried out when the app is opened, but when the user of the Android app navigates to a certain page.

Thank you!

Answer 1

all Xamarin Forms pages have an OnAppearing method that will be called when the page displays

public partial class MyPage : ContentPage
{
    public MyPage ()
    {
        InitializeComponent ();
    }

    public override void OnAppearing()
    {
      // call your method here
    }
}

you can then use MessagingCenter to send a message from the page to your MainActivity

in MainActivity

MessagingCenter.Subscribe<MyPage>(this, "MyPageAppearing", (sender) =>
{
    // Do something whenever the message is received
});

and in your page's OnAppearing

MessagingCenter.Send<MyPage>(this, "MyPageAppearing");