Double tap to exit in xamarin Android

So I had to implement double tap to exit from app in Android using xamarin. This how it is implemented

• Create blank Android App

 

• Override OnBackPressed method in MainActivity.cs

	private bool doubleBackToExitPressedOnce = false;
	public override void OnBackPressed()
	{
	if (doubleBackToExitPressedOnce)
	{
	base.OnBackPressed();
	Java.Lang.JavaSystem.Exit(0);
	return;
	}
	this.doubleBackToExitPressedOnce = true;
	Toast.MakeText(this, "Double tap to exit", ToastLength.Short).Show();
	new Handler().PostDelayed(() =>
	{
	doubleBackToExitPressedOnce = false;
	}, 2000);
	}

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MainActivity.cs

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• That’s it 🙂 Run the app and see the out put

Thanks. 🙂

 

Toast in android using xamarin forms

 

When we want to let user know that something happening we can use Toast.

Let’s see how to create Toast in in Android in Xamarin Forms

Create xamrin foms application with Android project

• In .net standard project add a Interface

	public interface IToastMessageService
	{
	void ShowToastMessage(string message);
	}

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IToastMessageService.cs

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• In Android project add ToastMessageService and implement the IToastMessageService

	[assembly: Xamarin.Forms.Dependency(typeof(ToastMessageService))]
	namespace ToastTestXamarin.Droid
	{
	public class ToastMessageService : IToastMessageService
	{
	public void ShowToastMessage(string message)
	{
	Toast.MakeText(Android.App.Application.Context, message, ToastLength.Long).Show();
	}
	}
	}

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ToastMessageService.cs

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• In MainPage.xaml add a button

	<?xml version="1.0" encoding="utf-8" ?>
	<ContentPage xmlns="http://xamarin.com/schemas/2014/forms&quot;
	xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml&quot;
	xmlns:local="clr-namespace:ToastTestXamarin"
	x:Class="ToastTestXamarin.MainPage">
	<Button x:Name="BtnToastMessage" Text="Show Toast" Clicked="ShowToast"></Button>
	</ContentPage>

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MainPage.xaml

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• And in the code behind implement the event handler

	private void ShowToast(Object sender, EventArgs args)
	{
	DependencyService.Get<IToastMessageService>().ShowToastMessage("Test Toast Message");
	}

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MainPage.xaml.cs

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Finally run the project 🙂

 

Get the sample project on Github