HomeFragment.java

private ViewModelProvider.Factory fuelLogViewModelFactory;
private FuelLogViewModel fuelLogViewModel;

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        fuelLogViewModel = ViewModelProviders.of(getActivity(),fuelLogViewModelFactory)
                .get(FuelLogViewModel.class);

        observeForAverageConsumption();
    }


private void observeForAverageConsumption() {
        fuelLogViewModel.getAverageFuelConsumption().observe(this, new Observer<FuelStat>() {
            @Override
            public void onChanged(FuelStat fuelStat) {
                if(Objects.isNull(fuelStat)) {
                    averageConsumptionValue.setText(getText(R.string.empty_value));
                    drivingCost.setText(getText(R.string.empty_value));
                    totalDistance.setText(getText(R.string.empty_value));
                    totalAmouunt.setText(getText(R.string.empty_value));
                    totalFuelConsumption.setText(getText(R.string.empty_value));
                } else {
                    averageConsumptionValue.setText(String.valueOf(fuelStat.getAverageConsumption()));
                    drivingCost.setText(String.valueOf(fuelStat.getDrivingCost()));
                    totalDistance.setText(String.valueOf(fuelStat.getTotalDistance()));
                    totalAmouunt.setText(String.valueOf(fuelStat.getTotalAmount()));
                    totalFuelConsumption.setText(String.valueOf(fuelStat.getTotalFuelConsumption()));
                }
            }
        });
    }