private void initializeInCall() { if (mCallCardFragment == null) { mCallCardFragment = (CallCardFragment) getFragmentManager().findFragmentById(R.id.callCardFragment); } mChildFragmentManager = mCallCardFragment.getChildFragmentManager(); if (mCallButtonFragment == null) { mCallButtonFragment = (CallButtonFragment) mChildFragmentManager.findFragmentById(R.id.callButtonFragment); mCallButtonFragment.getView().setVisibility(View.INVISIBLE); } if (mAnswerFragment == null) { mAnswerFragment = (AnswerFragment) mChildFragmentManager.findFragmentById(R.id.answerFragment); } if (mConferenceManagerFragment == null) { mConferenceManagerFragment = (ConferenceManagerFragment) getFragmentManager().findFragmentById(R.id.conferenceManagerFragment); mConferenceManagerFragment.getView().setVisibility(View.INVISIBLE); } }