This post will help you create a navigation link using Xamarin Forms and its click event in Android app. I am using Windows 10 and have created a Xamarin Form template app.

Create MainPage NaviationPage

In your App.xaml.cs file, set your MainPage value to NavigationPage( new yourButtonPage(), true).

public App()
        {
            InitializeComponent();

            MainPage = new NavigationPage(new MainPage());
            
        }

Remember, MainPage.xaml file has the button and this also creates a back button on the top to return to the previous page.

Create a Button in .xaml file

This file could be of your choice, I have MainPage.xaml file, where I have created a button.

<Button 
       Clicked="Button_Clicked"    
       Text="Submit"
       BorderWidth="1"
       BorderColor="Black"
       TextColor="DarkGray"
       BackgroundColor="Azure"
    />

Note: There are two button attributes that you must have Clicked and Text, the rest are optional to create a navigation click event.

Tip: While typing Clicked, just press TAB button twice on your keyboard to auto create the click event method in the corresponding C# file, in my case, its MainPage.xaml.cs file. And add the following code.

 private async void Button_Clicked(object sender, EventArgs e)
        {
            await Navigation.PushAsync(new ContactsPage(), true);
        }