Handling back button press Inside Fragments

//on fragment itself call :
getFragmentManager().popBackStack();

//handle click on activity shows the fragment
	@Override
	public void onBackPressed() {
		int count = getFragmentManager().getBackStackEntryCount();
		if (count == 0) { //when use it with drawer make it 1
			super.onBackPressed();
		} else {
			getFragmentManager().popBackStack();
		}
	}

//warning the beginTransaction, should be use addToBackStack
//source - http://www.tech.theplayhub.com/how_to_implement_onbackpressed_in_android_fragments/
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.frame_container, fragment).addToBackStack(null).commit();