Android 通过反射获取DatePicker 中的控件，并改变其颜色

到最后也只是成功改变了中间部分的颜色。

   private void setDatePickerDividerColor(DatePicker datePicker) {
        // Divider changing:

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

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

            Field[] pickerFields = NumberPicker.class.getDeclaredFields();
            for (Field pf : pickerFields) {
                pf.setAccessible(true);
                String pfString = pf.getName();
                try {
                    if (pfString.equals("mSelectionDivider")) {
                        pf.set(picker, new ColorDrawable(Color.parseColor("#ffffff")));//设置分割线颜色
                        break;
                    } else if (pfString.equals("mInputText")) {
                        EditText mInputText = (EditText) pf.get(picker);//获得该属性对应的对象
                        mInputText.setTextColor(view.getResources().getColor(R.color.white));
                        break;
                    } else if (pfString.equals("mSelectorWheelPaint")) {
                        Paint mPaint = (Paint) pf.get(picker);//获得该属性对应的对象
                        mPaint.setColor(view.getResources().getColor(R.color.white));
                        break;
                    } else if (pfString.equals("mVirtualButtonPressedDrawable")) {
                        pf.set(picker, new ColorDrawable(Color.parseColor("#ffffff")));
                        break;
                    }
                } catch (IllegalArgumentException e) {
                    e.printStackTrace();
                } catch (Resources.NotFoundException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            }
        }
    }