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Xamarin.Essentials: App Actions

  • Artikkeli

The AppActions class lets you create and respond to app shortcuts from the app icon.

Get started

To start using this API, read the getting started guide for Xamarin.Essentials to ensure the library is properly installed and set up in your projects.

To access the AppActions functionality the following platform specific setup is required.

Add the intent filter to your MainActivity class:

[IntentFilter(
        new[] { Xamarin.Essentials.Platform.Intent.ActionAppAction },
        Categories = new[] { Android.Content.Intent.CategoryDefault })]
public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
    ...

Then add the following logic to handle actions:

protected override void OnResume()
{
    base.OnResume();

    Xamarin.Essentials.Platform.OnResume(this);
}

protected override void OnNewIntent(Android.Content.Intent intent)
{
    base.OnNewIntent(intent);

    Xamarin.Essentials.Platform.OnNewIntent(intent);
}

Create Actions

Add a reference to Xamarin.Essentials in your class:

using Xamarin.Essentials;

App Actions can be created at any time, but are often created when an application starts. Call the SetAsync method to create the list of actions for your app.

try
{
    await AppActions.SetAsync(
        new AppAction("app_info", "App Info", icon: "app_info_action_icon"),
        new AppAction("battery_info", "Battery Info"));
}
catch (FeatureNotSupportedException ex)
{
    Debug.WriteLine("App Actions not supported");
}

If App Actions are not supported on the specific version of the operating system a FeatureNotSupportedException will be thrown.

The following properties can be set on an AppAction:

  • Id: A unique identifier used to respond to the action tap.
  • Title: the visible title to display.
  • Subtitle: If supported a sub-title to display under the title.
  • Icon: Must match icons in the corresponding resources directory on each platform.

App Actions on Homescreen

Responding To Actions

When your application starts register for the OnAppAction event. When an app action is selected the event will be sent with information as to which action was selected.

public App()
{
    //...
    AppActions.OnAppAction += AppActions_OnAppAction;
}

void AppActions_OnAppAction(object sender, AppActionEventArgs e)
{
    // Don't handle events fired for old application instances
    // and cleanup the old instance's event handler
    if (Application.Current != this && Application.Current is App app)
    {
        AppActions.OnAppAction -= app.AppActions_OnAppAction;
        return;
    }
    MainThread.BeginInvokeOnMainThread(async () =>
    {
        await Shell.Current.GoToAsync($"//{e.AppAction.Id}");
    });
}

GetActions

You can get the current list of App Actions by calling AppActions.GetAsync().

API