How do I close App on Back button press in an Activity which is not the launcher activity in android?

Issue

I have a login Activity and Home Activity in my app. The login Activity is the launcher Activity and it checks if user is already logged in and then auto directs the user to the Home Activity if he is already logged in. Now when the user is in the Home Activity and presses the back button, I want the user to quit the app like the same behavior that occurs when back button is pressed on the launcher activity. How do i achieve this? I definitely don't want him to be taken to the login activity because he is logged in already.

What I am doing right now is this, I have added the 'clear top' intent flags but user goes back to the Login Activity with this:

val intent = Intent(AuthUI.getApplicationContext(), 
         HomeActivity::class.java) 
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
startActivity(intent)

Also, I am not using the Navigation Library in android

Solution

You can finish the Login activity after starting the Home Activity.

startActivity('intent that starts home activity')
finish()

Or you can call the finishAffinity() on backpressed in the home activity

Answered By - Ambrose Bako