Android set back button to last activity -

Android set back button to last activity -

i have 2 activities i'll phone call activity , activity b. activity , activity b both have button take them final activity. because can arrive @ final activity different ways, cannot set parent , navigate that. how can set things knows activity used lastly , go one?

in activity / b when phone call c use:

intent intent = new intent(this, activityc.class); intent.putextra("caller", "activityclassname"); startactivity(intent);

in activity c:

@override public void onbackpressed() { bundle extras = getintent().getextras(); if (extras != null) { string value = extras.getstring("caller"); startactivity(this, class.forname(value)); } }

android android-activity parent back