Android 通過反射來隱藏年月日的日-DatePicker

經常會有這樣的需求，就是去隱藏年月日中的年或者日，下面我通過反射來達到這樣的目的

現在5.0以上的也需要去單獨判斷一下，有的寫5.0的Build.VERSION_CODES出現錯誤的話，建議直接寫成數字

    /**
     * @param picker 傳入一個DatePicker對象,隱藏或者顯示相應的時間項
     */
    public static void hidePicker(DatePicker picker) {
        // 利用java反射技術得到picker內部的屬性，並對其進行操作
        Class<? extends DatePicker> c = picker.getClass();
        try {
            Field fd = null, fm = null, fy = null;
            // 系統版本大於5.0
            if (Build.VERSION.SDK_INT >= TELVERSION) {
                int daySpinnerId = Resources.getSystem().getIdentifier("day", "id", "android");
                if (daySpinnerId != 0) {
                    View daySpinner = picker.findViewById(daySpinnerId);
                    if (daySpinner != null) {
                        daySpinner.setVisibility(View.GONE);
                        return;
                    }
                }
            } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
                // 系統版本大於4.0
                fd = c.getDeclaredField("mDaySpinner");
                fm = c.getDeclaredField("mMonthSpinner");
                fy = c.getDeclaredField("mYearSpinner");
            } else {
                fd = c.getDeclaredField("mDayPicker");
                fm = c.getDeclaredField("mMonthPicker");
                fy = c.getDeclaredField("mYearPicker");
            }
            // 對字段獲取設置權限
            fd.setAccessible(true);
            fm.setAccessible(true);
            fy.setAccessible(true);
            // 得到對應的控件
            View vd = (View) fd.get(picker);
            View vm = (View) fm.get(picker);
            View vy = (View) fy.get(picker);

            vd.setVisibility(View.GONE);
            vm.setVisibility(View.VISIBLE);
            vy.setVisibility(View.VISIBLE);
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }