Running code when splash screen is shown in an MAUI application - maui

Question

I want to run some code while the splash screen is shown in a MAUI application. The official documentation has only instruction about the image (so far).
I assume I need to do a solution for each platform. I have tried to follow the instruction for Xamarin on Android and getting pretty close. I have created this Activity:
[Activity(Theme = "#style/MyTheme.Splash", MainLauncher = true, NoHistory = true)]
public class SplashActivity : MauiAppCompatActivity
{
static readonly string TAG = "X:" + typeof(SplashActivity).Name;
public override void OnCreate(Bundle savedInstanceState, PersistableBundle persistentState)
{
base.OnCreate(savedInstanceState, persistentState);
Log.Debug(TAG, "SplashActivity.OnCreate");
}
// Launches the startup task
protected override void OnResume()
{
base.OnResume();
Task startupWork = new Task(() => { SimulateStartup(); });
startupWork.Start();
}
// Simulates background work that happens behind the splash screen
async void SimulateStartup ()
{
Log.Debug(TAG, "Performing some startup work that takes a bit of time.");
await Task.Delay (3000); // Simulate a bit of startup work.
Log.Debug(TAG, "Startup work is finished - starting MainActivity.");
//StartActivity(new Intent(MainApplication.Context, typeof (MainActivity)));
}
}
My problem is that when SimulateStartup starts to run the UI is launching, despite MainActivity is never created.

Answer 1

In then end of MauiProgram.CreateMauiApp() I have added this:
var app = builder.Build();
Task.Run(async () =>
{
await Task.Delay(4000);
var bootstrap = app.Services.GetRequiredService<MyBootstrapService>();
await bootstrap.SetupAsync();
}).Wait();
return app;
It works on Android. In Windows there are no splash screen, so user will se nothing until the bootstrapping is ready.