How to prevent to navigate to the previous page

Question

Hello

In android app xamarin

In my app i have 2 activities.

Is there a possibility to prevent the user to navigate to the previous activity (the last page).

when i click the > on the bottom toolbar i navigate to the last page so i would like to prevent

the user

Thanks

Answer 1

Hello,

For preventing the back key from returning, in Android you can achieve this by rewriting OnBackPressed.

Please refer to the key snippets below:

For activity1:

Intent intent = new Intent(this, typeof(Activity1));
// Declare that this navigation stack currently has two activities when the page jumps
intent.PutExtra("stack_count", 1);
StartActivity(intent);

For Activity2:

// If this activity is second, the back event is not triggered.
public override void OnBackPressed()
{
    int count = Intent.GetIntExtra("stack_count", 0);
    if (count < 1)
    {
        base.OnBackPressed();
    }
}

Best Regards,

Alec Liu.

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Answer 2

How do you claim that is the correct answer when OnBackPressed is now deprecated?

Answer 3

Further to my earlier comment about OnBackPressed being deprecated.

A couple of examples showing how to replace it.

https://vladislavantonyuk.github.io/articles/Migrate-the-deprecated-OnBackPressed-function-in-.NET-MAUI-Android-application/

The above is for Maui users.

The next is for Android either Xamarin.Android or Net7. The example is a Net7 project but the logic can just as easily be backported to a Xamarin.Android project.

https://github.com/gmck/PredictiveBackGestureNet7