public DatePicker(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.DatePicker, defStyleAttr, defStyleRes); final int mode = a.getInt(R.styleable.DatePicker_datePickerMode, MODE_SPINNER); final int firstDayOfWeek = a.getInt(R.styleable.DatePicker_firstDayOfWeek, 0); a.recycle(); switch (mode) { case MODE_CALENDAR: mDelegate = createCalendarUIDelegate(context, attrs, defStyleAttr, defStyleRes); break; case MODE_SPINNER: default: mDelegate = createSpinnerUIDelegate(context, attrs, defStyleAttr, defStyleRes); break; } if (firstDayOfWeek != 0) { setFirstDayOfWeek(firstDayOfWeek); } }