@Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_to_do_list, container, false);
        mHelper = new TaskDbHelper(getContext());
        mTaskListView = view.findViewById(R.id.list_view);
        button = view.findViewById(R.id.button);
        return view;
    }
public void doneTask(View view) {
        View parent = (View) view.getParent();
        TextView taskTextView = (TextView) parent.findViewById(R.id.task_title);
        String task = String.valueOf(taskTextView.getText());
        SQLiteDatabase db = mHelper.getWritableDatabase();
        db.delete(TaskContract.TaskEntry.TABLE,
                TaskContract.TaskEntry.COL_TASK_TITLE + " = ?",
                new String[]{task});
        db.close();
        updateUI();
        totalTasksDone++;
    }