The back button (touch) on Android minimizes the application, how to make it return to the previous activity?

Question

Java

I wrote an application in android studio, after which I noticed that the back button in genymotion and AVD minimizes the application, what could be the problem?

Answer 1

Try to specify in the manifest for the activity where the transition should be made using parentActivityName
<activity
android:name=".MyActivity"
android:parentActivityName=".MainActivity" />

Answer 2

what could be the problem?

for example, the backstack is empty.