Xamarin Forms: App is always restarting when resuming from background

The datepicker UI is breaking and it is showing on top of the splash screen background like below:

Code:

<DatePicker
	x:Name="startdate_datepicker"
	Grid.Column="1"
	Format="MM/dd/yyyy"
	PropertyChanged="StartDateChoosed"
	HorizontalOptions="StartAndExpand"
	VerticalOptions="Center"/>

My Style:

<style name="MainTheme" parent="MainTheme.Base">
	<item name="android:forceDarkAllowed">false</item>
	<item name="android:windowBackground">@drawable/splashscreen</item>
	<item name="android:textAllCaps">false</item>
	<item name="colorPrimary">#e6e6e6</item>
	<item name="colorPrimaryDark">#000000</item>
	<item name="colorAccent">#808080</item>

For solving this issue I made some updates on Style and MainActivity.

Created a new style for splash:

<style name="MyTheme.Splash" parent="Theme.AppCompat.Light">
	<item name="android:forceDarkAllowed">false</item>
	<item name="android:windowBackground">@drawable/splashscreen</item>
	<item name="android:textAllCaps">false</item>
	<item name="colorPrimary">#e6e6e6</item>
	<item name="colorPrimaryDark">#000000</item>
	<item name="colorAccent">#808080</item>
</style>

<style name="MyTheme.Main" parent ="MainTheme.Base">
	<item name="windowActionBar">false</item>
	<item name="windowNoTitle">true</item>
	<item name="android:forceDarkAllowed">false</item>
	<item name="android:textAllCaps">false</item>
	<item name="colorPrimary">#e6e6e6</item>
	<item name="colorPrimaryDark">#000000</item>
	<item name="colorAccent">#808080</item>
</style>

MainActivity:

[Activity(
	Label = "App Name", 
	Theme = "@style/MyTheme.Main", 
	Icon = "@drawable/launcher_icon", 
	MainLauncher = false,
	NoHistory = true,
	Exported =true,
	ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation, 
	ScreenOrientation = ScreenOrientation.Portrait)]

public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
	protected override void OnCreate(Bundle savedInstanceState)
	{
		base.OnCreate(savedInstanceState, persistentState);
	}
}

[Activity(
		Theme = "@style/MyTheme.Splash",
		MainLauncher = true,
		NoHistory = true,
		ScreenOrientation = ScreenOrientation.Portrait)]
public class SplashActivity : AppCompatActivity
{
	public override void OnCreate(Bundle savedInstanceState, PersistableBundle persistentState)
	{
		base.OnCreate(savedInstanceState, persistentState);
	}

	protected override void OnResume()
	{
		base.OnResume();
		var startUp = new Task(() =>
		{
			var intent = new Intent(this, typeof(MainActivity));
			StartActivity(intent);
		});
		startUp.ContinueWith(t => Finish());
		startUp.Start();
	}
}

But now my app is always restarting when resuming from background due to the OnResume() code in SplashActivity. I need to stay on the same page if I resume from background. For that What change I need to do on SplashActivity?

According to the Xamarin.Forms documentation on app lifecycle methods, you can use the OnSleep and OnResume methods

• OnSleep - called each time the application goes to the background.

• OnResume - called when the application is resumed, after being sent
  to the background.

Here is the demo you can refer to:

protected override void OnSleep()
{
    // Save the current page state
    var currentPage = Application.Current.MainPage as NavigationPage;
    var state = currentPage.CurrentPage.BindingContext;
    Application.Current.Properties["CurrentPageState"] = state;
}

protected override void OnResume()
{
    // Retrieve the saved page state and set the page properties
    if (Application.Current.Properties.ContainsKey("CurrentPageState"))
    {
        var state = Application.Current.Properties["CurrentPageState"];
        var currentPage = Application.Current.MainPage as NavigationPage;
        currentPage.CurrentPage.BindingContext = state;
    }
}

The issue is caused by recreating the MainActivity when calling the resume method when restoring the app from the background.

[Activity(Label = "Mobile App",
		Theme = "@style/Your_Splash_Theme",
		Icon = "@drawable/Your_Icon",
		MainLauncher = true,
		ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation,
		LaunchMode = LaunchMode.SingleTop)]

public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
	protected override void OnCreate(Bundle savedInstanceState)
	{
		base.Window.RequestFeature(WindowFeatures.ActionBar);
		// Name of the MainActivity theme you had there before.
		base.SetTheme(Resource.Style.MainTheme);
		base.OnCreate(savedInstanceState);

		Xamarin.Essentials.Platform.Init(this, savedInstanceState);
		global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
		LoadApplication(new App());
	}
// other methods
}