Hit the back button but not kill the activity and let it be in Back Stack (Android)

Question

I have 3 activities A, B and C.

I inflate activity B dynamically on a button click and the user can add as many views as he likes.

The operation is like this:

Answer 1

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {

        switch(keyCode)
        {
        case KeyEvent.KEYCODE_BACK:
            //bring back the previous activity do your logic here           
            return false;
        }
    return super.onKeyDown(keyCode, event);
}

You could use this, return false when activity should not be closed. use FLAG_ACTIVITY_REORDER_TO_FRONT to launch the previous activity