How to terminate a Xamarin application?

Question

How to terminate a Xamarin application from any of the activities?

I have tried both System.Environment.Exit(0) and System.Environment.Exit(1) as well as Finish() and killing all the activities.

It still opens one blank page with default activity name and a black screen.

Is there any specific solution for this?

Solution 1

If you are using Xamarin.Forms create a Dependency Service.

Interface

public interface ICloseApplication
{
    void closeApplication();
}

Android : Using FinishAffinity() won't restart your activity. It will simply close the application.

public class CloseApplication : ICloseApplication
{
    public void closeApplication()
    {
        var activity = (Activity)Forms.Context;
        activity.FinishAffinity();
    }
}

IOS : As already suggested above.

public class CloseApplication : ICloseApplication
{
    public void closeApplication()
    {
        Thread.CurrentThread.Abort();
    }
}

UWP

public class CloseApplication : ICloseApplication
{
    public void closeApplication()
    {
        Application.Current.Exit();
    }
}

Usage in Xamarin Forms

var closer = DependencyService.Get<ICloseApplication>();
    closer?.closeApplication();

Solution 2

A simple way to make it work cross platform is by this command:

System.Diagnostics.Process.GetCurrentProcess().CloseMainWindow();

Got it from this link.

EDIT: After using it for a while, I discovered that .CloseMainWindow() don't kill the application, only Closes it (well, thats obvious). If you want to terminate the app (kill), you shoud use the following:

System.Diagnostics.Process.GetCurrentProcess().Kill();

Solution 3

For Android, you can do

Android.OS.Process.KillProcess(Android.OS.Process.MyPid());

iOS explicitly does not provide any API for existing an App. Only the OS can close an App.

Solution 4

For iOS, you can use this code:

Thread.CurrentThread.Abort();

For Android, as @Jason mentioned here:

Android.OS.Process.KillProcess(Android.OS.Process.MyPid());

Solution 5

System.Environment.Exit(0);

Works for me.

View more solutions

Comments

[Nik]

I had apply this code but this also returns me the same black page with title of the main activity....Is there any other solution or am i missing anything over there?

[Nik]

I had apply this code but this also returns me the same black page with title of the main activity....Is there any other solution or am i missing anything over there?

[IdoT]

Well, it works for my app. Maybe you're not calling it from the main UI thread? try to terminate the app inside this lambda expression: Xamarin.Forms.Device.BeginInvokeOnMainThread( () => {Android.OS.Process.KillProcess(Android.OS.Process.MyPid());‌​}); Let me know if it helps.

[Nik]

Thanks for your response.And yes i want to terminate the app from child thread,not the main UI thread and my project is in Xamarin.Android not in Xamarin.Forms so can you give me the solution for that? Thanks once again

[IdoT]

You have to be on the main thread in order to close the app. try this code: Acitivty.RunOnUiThread(() => { Android.OS.Process.KillProcess(Android.OS.Process.MyPid()); });

[Nik]

Ok..I am able to achieve this using int pid = Android.OS.Process.MyPid();Android.OS.Process.KillProcess(pi‌​d); but it still shows run my application in background..is there any specific code for that?

[IdoT]

Do you want to remove your app from the background running apps? It's not a standard behavior for the user.

[Damian]

Thank you! Reading on other threads they said, "can't do this in iOS". It's good to see there IS a way.

[Durai Amuthan.H]

@Damian - I guess apple won't allow this as its against the convention and in the appstore based iOS native apps apple monitors that the developers are not using any private api to close the app though and I am not sure have you checked if it generates any crash log just a thought

[Litera]

This worked for Android for me but I had to add [assembly: Dependency(typeof(CloseApplication))] to the CloseApplication class for it to get the dependency service

[Matt]

I also had to add the dependency. Here's the syntax for anyone else like me who had to think about it for a bit: [assembly: Dependency(typeof(CloseApplication))] namespace MyNamespace.Droid { class CloseApplication : ICloseApplication { public void closeApplication() { var activity = (Activity)Forms.Context; activity.FinishAffinity(); } } }

[Karen Cate]

I don't think this actually closes the app. It makes the window go away, but the app is still running... at least the debugger doesn't exit when run in a simulator.

[Andy Stannard]

Just a thought but as Apple tells you not to do this there is a good chance an app using this technique won't get through the apple app store review.

[jase]

Use this if you want terminate all the application processes. (Timers, services, etch...)

[Nick Kovalsky]

All instanced classes also remain in memory... And when you relaunch their instances are already here full of previous data.

[Zam]

Works with VS2017! All other answers doesn't

[Jason]

@Zam this may not be valid for newer versions of Android, but it has nothing to do with the version of the IDE that you use

[this.myself]

Is this accepted by Apple when publishing in the App Store? For Google Play Store I don't doubt...

[vhoyer]

I honestly don't see much difference between a Thread.CurrentThread.Abort(); and a System.Diagnostics.Process.GetCurrentProcess().Kill();

[Quarkly]

It's a bad idea to use any Diagnostic method for production code. Use System.Environment.Exit(0) instead.

[Matas Vaitkevicius]

non universal, fails on Android.

[Matas Vaitkevicius]

Confirmed, works on both Android and iOS

[Matas Vaitkevicius]

@Quarkly System.Environment.Exit(0) Does not work on Android.

[ToolmakerSteve]

Not necessarily. (Or more accurately, it depends on Android API level, and vendor's implemention.) I can prove this on my device by POWERING OFF. When power back on, the list shows all RECENTLY USED apps. Even though NO apps are running. (I have disabled or deleted any apps that use background services.) Proving that, at least on this device, that is NOT a list of "Open Apps" - it is a list of "Recently Used Apps" (minus any that have been manually swiped away). "Close all" does clear that list. Where the list would be, is text saying "No recently used apps.". (emphasis added).