Generic handle OnBackPressed()

Question

I have a BaseActivity() that have many activities and a BaseFragment() that have many fragments. Each activity contains 2-3 fragments and I need to make a generic method to handle each onBackPressed from all fragments (all - means all app screens) but this method should be in Base Fragment() (every fragment extends it). I supose that I'll need a kind of listener to tie OnBackPressed() from BaseActivity() to genericMethod() from BaseFragment()

Thanks in advice.

Answer 1

The simplest solution rest to be a bit "hard programmed" in my case, like I mentioned in my question I need a method from BaseFragment() to handle all back press actions from all screens that means all fragments that extends this BaseFragment().

@Sharp Edge solution may be accepted but why to handle it in each SimpleActivity() that extends BaseActivity() if I can just add a single method in BaseFragment() and all simple activities that extends BaseActivity() will don't care about that.

@escape-llc solution is confused and not the expected one... I can handle it easier using EventBus or Otto and send from onResume() from each fragment to SimpleActivity(). So I'll receive the actual open fragment and I'll now what action to do when onBackPressed() is executed...

So, like I said, my solution is to use just a simple generic method in BaseFragment():

   public void doBackBtnPressedAction(View view) {
    view.setFocusableInTouchMode(true);
    view.requestFocus();

    view.setOnKeyListener(new View.OnKeyListener() {
        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (event.getAction() == KeyEvent.ACTION_DOWN) {
                if (keyCode == KeyEvent.KEYCODE_BACK) {

                    //logical part, in my case some server requests 

                    return true;
                }
            }
            return false;
        }
    });
}