Back button on action bar-CodePudding

when I create a new activity, Android Studio show me this photo:

It have a Back button but activity haven't it. how can I Make visible it?

CodePudding user response：

put getSupportActionBar().setDisplayHomeAsUpEnabled(true); into onCreate() method in your activity class

CodePudding user response：

In manifest declare the activity as a parent activity to get this button like this

<activity android:name="com.owletogroceries.activity.RewardsActivity"/>

<activity android:name="OrderConfirmationActivity" 
          android:parentActivityName="ProductActivity"/>