public static void setNumberPickerDividerColor(Context context, NumberPicker numberPicker) {
    NumberPicker picker = numberPicker;
    Field[] pickerFields = NumberPicker.class.getDeclaredFields();
    for (Field pf : pickerFields) {
      if (pf.getName().equals("mSelectionDivider")) {
        pf.setAccessible(true);
        try {
          //设置分割线的颜色值
          pf.set(picker, new ColorDrawable(context.getResources().getColor(R.color.theme_pink)));
        } catch (IllegalArgumentException e) {
          e.printStackTrace();
        } catch (Resources.NotFoundException e) {
          e.printStackTrace();
        } catch (IllegalAccessException e) {
          e.printStackTrace();
        }
        break;
      }
    }
  }

public static void setDatePickerDividerColor(Context context, DatePicker datePicker){

    // 获取 mSpinners
    LinearLayout llFirst = (LinearLayout) datePicker.getChildAt(0);

    // 获取 NumberPicker
    LinearLayout mSpinners = (LinearLayout) llFirst.getChildAt(0);
    for (int i = 0; i < mSpinners.getChildCount(); i++) {
      NumberPicker picker = (NumberPicker) mSpinners.getChildAt(i);

      Field[] pickerFields = NumberPicker.class.getDeclaredFields();
      for (Field pf : pickerFields) {
        if (pf.getName().equals("mSelectionDivider")) {
          pf.setAccessible(true);
          try {
            pf.set(picker, new ColorDrawable(context.getResources().getColor(R.color.theme_pink)));
          } catch (IllegalArgumentException e) {
            e.printStackTrace();
          } catch (Resources.NotFoundException e) {
            e.printStackTrace();
          } catch (IllegalAccessException e) {
            e.printStackTrace();
          }
          break;
        }
      }
    }
  }

DatePickerDialog datePickerDialog = 
    new DatePickerDialog(mContext, 0, listener, year, month, day);
    datePickerDialog.setTitle("选择年月");
    datePickerDialog.show();
    DatePicker datePicker = datePickerDialog.getDatePickerStart(); //获取DatePicker
    CommonUtil.setDatePickerDividerColor(mContext, datePicker); //设置分割线颜色
    /*修改按钮颜色这个必须在show或者create方法后面*/
    Button commitBtn = datePickerDialog.getButton(DialogInterface.BUTTON_POSITIVE); //确认按钮
    commitBtn.setTextColor(Color.parseColor("#e8615e"));