MainActivity to fragment and back to MainActivity on pressing back button

Question

I have a Mainactivity which contains a Layout which is parent of 4 sub layout. on clicking on sub layout i am going to a new fragment replacing main layout. But i cant go ba

Answer 1

If you have one Activity and four fragments then set onBackPressed() as below in your MainActivity.

@Override
        public void onBackPressed()
        {
            super.onBackPressed();
            finish();          
        }

And in fragments:

 @Override
    public void onResume() {

        super.onResume();
        new PlayListFragment();
        getView().setFocusableInTouchMode(true);
        getView().requestFocus();
        getView().setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {

                if (event.getAction() == KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_BACK){
                    if(getFragmentManager().getBackStackEntryCount() > 0) {
                      getFragmentManager().popBackStack();
                    }

                    return true;

                }

                return false;
            }
        });
    }