How to prevent going back to the previous activity?

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When the BACK button is pressed on the phone, I want to prevent a specific activity from returning to its previous one.

Specifically, I have login and sign up screens, both start a new activity called HomeScreen when successful login/signup occurs. Once HomeScreen is started, I want to prevent the users from being able to return to the login or sign up screens by pressing the BACK key.

I tried using Intent.FLAG_ACTIVITY_NO_HISTORY, but since the application has Facebook integration, when the ‘Login with Facebook’ is used, Facebook should return to the initial login screen, therefore I should keep a history of these activities.

I thought of overriding the behaviour of the BACK button on HomeScreen to directly finish an application when the button is pressed and I used

@Override
public void onBackPressed() {
    finish();
}

but that also does not work.

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