i want to navigate from a page to an other page - xamarin

Question

i want to navigate from a page(not main page) which is in a tabbed page to a page when clicking on a button. i tried this :
MainPage = new NavigationPage(new listofinterest());
MainPage = new TabbedPageMain()
{
BarBackgroundColor = Color.FromHex("#F8F8F8"),
};
////////
public partial class listofinterest : ContentPage
{
private async void Add(object sender, EventArgs e)
{
await Navigation.PushAsync(new NavigationPage(new MainPage()));
}
}
it didn't work i get this error
"PushAsync is not supported globally on Android, please use a NavigationPage.'"
i need help please.

Answer 1

The problem is your overriding the MainPage with the TabbedPageMain. Only set it once.
First set the MainPage in App.xaml.cs:
MainPage = new NavigationPage(new MyPage());
Then you can push other pages from MyPage like this:
await Navigation.PushAsync(new MyOtherPage());

Answer 2

it didn't work i get this error "PushAsync is not supported globally on Android, please use a NavigationPage.'" i need help please.
From your code and description, you want to navigate from one of Tabbedpages to other page in project. If yes, please add to a navigation stack is referred to as the root page of the application in App.xaml.cs.
public App()
{
InitializeComponent();
MainPage =new NavigationPage( new tabbedpage.TabbedPage1());
}
then Tabbedpage.xaml:
<TabbedPage
x:Class="FormsSample.tabbedpage.TabbedPage1"
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:FormsSample.simplecontrol">
<!-- Pages can be added as references or inline -->
<TabbedPage.Children>
<local:Page1 />
<local:Page3 />
<local:Page4 />
</TabbedPage.Children>
Wanting to navigate Page1 from Tabbedpage to other page.
<ContentPage
x:Class="FormsSample.simplecontrol.Page1"
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
Title="page 1">
<ContentPage.Content>
<ScrollView>
<StackLayout x:Name="Contenttest">
<Button
x:Name="btn1"
Clicked="btn1_Clicked"
Text="navigate to another page" />
</StackLayout>
</ScrollView>
</ContentPage.Content>
private void btn1_Clicked(object sender, EventArgs e)
{
Navigation.PushAsync(new simplecontrol.Page5());
}
About Navigation detailed info, please refer to
https://learn.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/navigation/hierarchical