native-essentials.md

title	description	ms.date	no-loc
Migrate Xamarin.Essentials code in .NET for Android and .NET for iOS apps	Learn how to migrate your Xamarin.Essentials code in .NET for iOS and .NET for Android apps.	03/09/2023	Xamarin.Essentials .NET MAUI

Migrate Xamarin.Essentials code in .NET for Android and .NET for iOS apps

Xamarin.Essentials is a fundamental library for nearly every Xamarin app, and its functionality is now part of .NET Multi-platform App UI (.NET MAUI).

The following steps outline the process to use .NET MAUI's native device functionality, formerly known as Xamarin.Essentials, in a .NET for Android or .NET for iOS app:

1. Remove the Xamarin.Essentials NuGet package from your .NET for Android or .NET for iOS app.
2. Set the $(UseMauiEssentials) build property to true in your project file. For more information, see Modify your project file.
3. Initialize the "essentials" functionality by calling the Platform.Init method. For more information, see Initialize the platform.
4. Perform additional setup, if necessary. For more information, see Perform additional setup.
5. Add using directives for the required functionality. For more information, see Add using directives.

Important

No action is required to use Xamarin.Essentials in a .NET MAUI app, other than removing references to the Xamarin.Essentials namespace, because .NET MAUI already includes the functionality from Xamarin.Essentials.

Modify your project file

To use .NET MAUIs native device functionality in a .NET for Android or .NET for iOS app, modify your project file and set the $(UseMauiEssentials) build property to true.

Android

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net8.0-android</TargetFramework>
    ...
    <UseMauiEssentials>true</UseMauiEssentials>
  </PropertyGroup>
</Project>

iOS

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net8.0-ios</TargetFramework>
    ...
    <UseMauiEssentials>true</UseMauiEssentials>
  </PropertyGroup>
</Project>

---

Initialize the platform

Android

In any xref:Android.App.Activity that's launched, you must call the Platform.Init method, which is in the xref:Microsoft.Maui.ApplicationModel namespace, from the OnCreate method:

using Android.Content.PM;
using Android.Runtime;
using Microsoft.Maui.ApplicationModel;

namespace MyAndroidApp;

[Activity(Label = "@string/app_name", MainLauncher = true)]
public class MainActivity : Activity
{
    protected override async void OnCreate(Bundle? savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        Platform.Init(this, savedInstanceState);
        // ...
    }
}

The Platform.Init method requires an xref:Android.App.Application argument, or a xref:Android.App.Activity argument and a xref:Android.OS.Bundle argument.

iOS

In your AppDelegate class, you must call the Platform.Init method, which is in the xref:Microsoft.Maui.ApplicationModel namespace, from the FinishedLaunching method:

using Microsoft.Maui.ApplicationModel;

namespace MyiOSApp;

[Register("AppDelegate")]
public class AppDelegate : UIApplicationDelegate
{
    public override UIWindow? Window
    {
        get;
        set;
    }

    public override bool FinishedLaunching(UIApplication application, NSDictionary launchOptions)
    {
        // create a new window instance based on the screen size
        Window = new UIWindow(UIScreen.MainScreen.Bounds);

        // create a UIViewController with a single UILabel
        var vc = new UIViewController();
        // ...
        Window.RootViewController = vc;

        Platform.Init(() => vc);

        // make the window visible
        Window.MakeKeyAndVisible();

        return true;
    }
}

The Platform.Init method requires a Func<UIKit.UIViewController argument.

Note

If required, you can retrieve the current xref:UIKit.UIViewController object by calling the Platform.GetCurrentUIViewController method.

---

Perform additional setup

The static Platform class contains platform-specific helpers.

Android

Member	Purpose
ActivityStateChanged	An event that's raised when any Activity's state changes.
AppContext	A property that gets the xref:Android.Content.Context object that represents the current app context.
CurrentActivity	A property that gets the current xref:Android.App.Activity object that represents the current activity.
Intent	A static class that contains the ActionAppAction string, which is the identifier for the xref:Android.Content.Intent used by app actions.
OnNewIntent	Pass an xref:Android.Content.Intent from an activity's overridden method, when invoking an app action.
OnResume	Pass an xref:Android.App.Activity from an activity's overridden method, when an xref:Android.App.Activity is resumed as part of invoking an app action.
OnRequestPermissionsResult	Pass permission request results from an activity's overridden method, for handling internal permission requests.
WaitForActivityAsync	Wait for an xref:Android.App.Activity to be created or become active.

To access the current Context or Activity for the running app:

var context = Platform.AppContext;

// Current Activity or null if not initialized or not started.
var activity = Platform.CurrentActivity;

If there's a situation where the xref:Android.App.Activity is needed, but the app hasn't fully started, call the WaitForActivityAsync method:

var activity = await Platform.WaitForActivityAsync();

To handle runtime permission requests, override the OnRequestPermissionsResult method in every xref:Android.App.Activity and call the Platform.OnRequestPermissionsResult method from it:

public override void OnRequestPermissionsResult(int requestCode, string[] permissions, Permission[] grantResults)
{
    Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);
    base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
}

In addition to getting the current xref:Android.App.Activity, you can also register for lifecycle events:

protected override void OnCreate(Bundle bundle)
{
    base.OnCreate(bundle);
    Platform.Init(this, bundle);
    Platform.ActivityStateChanged += Platform_ActivityStateChanged;
}

protected override void OnDestroy()
{
    base.OnDestroy();
    Platform.ActivityStateChanged -= Platform_ActivityStateChanged;
}

void Platform_ActivityStateChanged(object sender, ActivityStateChangedEventArgs e) =>
    Toast.MakeText(this, e.State.ToString(), ToastLength.Short).Show();

Activity states are:

• Created
• Resumed
• Paused
• Destroyed
• SaveInstanceState
• Started
• Stopped

iOS

Method	Purpose
ContinueUserActivity	Informs the app that there's data associated with continuing a task specified as a xref:Foundation.NSUserActivity object, and then returns whether the app continued the activity.
GetCurrentUIViewController	Gets the current view controller. This method returns null if unable to detect a xref:UIKit.UIViewController.
OpenUrl	Opens the specified URI to start an authentication flow.
PerformActionForShortcutItem	Invokes the action that corresponds to the chosen AppAction by the user.

For example, to handle app actions, override the PerformActionForShortcutItem method in your AppDelegate class and call the Platform.PerformActionForShortcutItem method from it:

public override void PerformActionForShortcutItem(UIApplication application, UIApplicationShortcutItem shortcutItem, UIOperationHandler completionHandler)
{
    Platform.PerformActionForShortcutItem(application, shortcutItem, completionHandler);
}

---

Add using directives

The implicit global using directives for .NET for iOS and .NET for Android don't include the namespaces for .NET MAUIs native device functionality. Therefore, using directives for the Xamarin.Essentials namespace should be replaced with using directives for the namespace that contains the required functionality:

Namespace	Purpose
xref:Microsoft.Maui.ApplicationModel	Application model functionality, including app actions, permissions, and version tracking.
xref:Microsoft.Maui.ApplicationModel.Communication	Communication functionality, including contacts, email, and networking.
xref:Microsoft.Maui.Devices	Device functionality, including battery, sensors, flashlight, and haptic feedback.
xref:Microsoft.Maui.Media	Media functionality, including media picking, and text-to-speech.
xref:Microsoft.Maui.ApplicationModel.DataTransfer	Sharing functionality, including the clipboard, and file sharing.
xref:Microsoft.Maui.Storage	Storage functionality, including file picking, and secure storage.

For more information about the functionality in each namespace, see Platform integration.