Back button on ActionBar/Toolbar | Android Studio | Kotlin

This tutorial is about how to add back button in ActionBar/Toolbar and go to previous activity on pressed.
We will create a button in MainActivity to move to NewActivity, and add back button in action bar of New Activity to move to previous activity(NewActivity).
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[@dvd8373]

Super clara la explicacion, gracias

[@Rohit-te9dr]

why did you write this line ( actionBar.setDisplayHomeAsUpEnabled(true)) twice ???

[@lawxultimateMan]

Thank you so much

[@AtifSayings]

you're welcome :)

[@shubhangikamthe4538]

THANKS

[@AtifSayings]

You're welcome

[@cleawrence]

good! thx but for fragments how do you do ?

[@patrickcommizza4754]

When I tried to run application on devices,activity which appeared first is second activity not first activity.
Hpw can I edit it

[@superrueben]

I have the same problem - did you fix it? if so, how?

[@TheUmi48]

Hi, when i press back, my app finish() and close

[@TheUmi48]

I look my error, i finish() my last activity

[@AtifSayings]

So is it resolved?

[@TheUmi48]

Yes, thanks :)

[@jefrychiedi]

Thanks

[@mkenzo_8]

THANKS

[@AtifSayings]

You are welcome