US 01.07.01 View current day's Habits - 5 pts

[cbebe]

As a doer, I want to see what habits I need to do today.

Rationale - Removes any unneeded information (habits that don't need to be pursued at the current day) from the user's view.

Story Points - 5

Risk Level - Medium

Details - Same list as all habits, just add a filter depending on the current day.

• Copy TodaysHabitsFragment class to HabitsListFragment (or all habits fragment) class.
• Make TodaysHabitsFragment extend HabitsListFragment and override method for updating the UI.

// For All Habits
@Override
public void onStart() {
    super.onStart();
    mHabitViewModel.getAllHabits().observe(this, list -> {
        // need to cast List<HabitEntity> to List<Habit>
        List<Habit> habits = new ArrayList<>(list);
        adapter.submitList(habits);
    });
}

// For Today's Habits
@Override
public void onStart() {
    super.onStart();
    mHabitViewModel.getAllHabits().observe(this, list -> {
        // need to cast List<HabitEntity> to List<Habit>
        List<Habit> habits = new ArrayList<>();
        for (HabitEntity h : list) {
            // method can be implemented in this fragment or in the `Habit` interface
            if (h.isTodaysHabit(today)) {
                habits.add(h);
            }
        }
        adapter.submitList(habits);
    });
}

Blocked by #2.

To be released at halfway checkpoint.