mDatePicker.setDescendantFocusability(DatePicker.FOCUS_BLOCK_DESCENDANTS);
mTimePicker.setDescendantFocusability(TimePicker.FOCUS_BLOCK_DESCENDANTS);
mNumberPicke.setDescendantFocusability(NumberPicker.FOCUS_BLOCK_DESCENDANTS);
原文：http://www.cnblogs.com/aidonglei/p/4480985.html