CODEWITHSUNDEEP
androidxamarin.formsxamarin.android
user18501010
user18501010

Reputation: 27

How to Shutdown Xamarin forms App to BackButton?

I'm making a Xamarin Forms App, and I want to put the ability to go back to the app screen via a hardware Back Button and exit the app when pressed on the first page.

I tried several codes to pass the Page name to OnBackPressed in MainActivity and to terminate the app when the corresponding parameter has the MainPage name.

  1. When a Back Button Event occurs in the page the user is currently viewing, the name of the page is delivered.

    (var Pages = Xamarin.Forms.Page.Page) -> Does not working

  2. Apply Environment.Exit(1) in OnBackPressed() function in Page.xaml.cs -> Does not work

Other than that, I tried many ways, but it didn't work.

Is there a way to kill the app with a hardware Back Button?

Upvotes: 1

Views: 805

Answers (1)

Liyun Zhang - MSFT
Liyun Zhang - MSFT

Reputation: 14224

I can provide an incomplete solution.

At first, the app can be killed with one line code in the android:

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

So you can try to override the OnBackPressed() method in the MainActivity and do a judgement. Such as:

 public override void OnBackPressed()
    {
        base.OnBackPressed();
        If() // if the page is the first page. or if a flag is true
          Android.OS.Process.KillProcess(Android.OS.Process.MyPid());
    }

You can also do this in the forms:

 protected override bool OnBackButtonPressed()
    {
        if()//Judge whether the current page is the first page
        {
           System.Diagnostics.Process.GetCurrentProcess().Kill(); 
        }
        return base.OnBackButtonPressed();
    }

Upvotes: 2

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