Android Actionbar return to parent activity

After the child activity inherits the Actionbaractivity class

When running on Android 4.1 (API level 16) or later, or using actionbaractivity in the Support library, implementing up-navigation requires that the parent activity be declared in the manifest file while the action B The Set up button is available in AR.

Child Activity Declaration

<activity
Android:name= "{Child package name}"
Android:parentactivityname= "{Parent package name}" >
<meta-data
Android:name= "Android.support.PARENT_ACTIVITY"
Android:value= "{Parent package name}"/>
</activity>

Android Actionbar return to parent activity