Android activity

I have five activities. The process is like this

In activity 5, press the back button to return to activity 2 or 3 after completing any activity? At present, I'm only the fourth

resolvent:

If you want to get 2 or 3, you want to write code on the back

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

          if (i == KeyEvent.KEYCODE_BACK) {
           Intent i=new Intent(getbaseapplicationcontext(),activity2.class)
                    startActivity(i)
              return true;

          }
          return super.onKeyDown(i, event);
        }

Another way is

If you want to complete any activities you don't want, you need activity4 here