问题描述

我想用
创建一个 ViewPager- 选定的中心项目比其他项目大
- 以前的部分 &下一项始终可见.

我正在使用 viewPager.setPageMargin(-20); 来制作 Previous &下一个项目可见.但是，如何使选中的中心项比其他项大一点.

I want to create a ViewPager with
- The selected center item being bigger than others
- Portion of Previous & Next items being always visible.

I am using viewPager.setPageMargin(-20); to make portion of Previous & Next items visible. But, how to make selected center item little bit bigger than other items.

推荐答案

可以在 onPageSelected() 方法中将 Layout 参数设置为大 x%.

you can set the Layout parameters to be x% bigger in the onPageSelected() method.

     ViewPager pager ;

    int prevIndex = 0;

    int oldWidth, oldHeight, 

//initialize these to be bigger than the old ones

newWidth, newHeight;
    pager.setOnPageChangeListener(new OnPageChangeListener() {

        public void onPageSelected(int index) {

// Set the layout params of the newly selected page to be the large width and height

            View v = pager.getChildAt(index);

            RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
                    newWidth, newHeight);

            v.setLayoutParams(params);

// Don't forget to set the past view to the old layout params.

            View oldV = pager.getChildAt(prevIndex);
            RelativeLayout.LayoutParams oldParams = new RelativeLayout.LayoutParams(
                    oldWidth, oldHeight);

            oldV.setLayoutParams(oldParams);

            prevIndex = index;
        }

        public void onPageScrolled(int arg0, float arg1, int arg2) {
            // TODO Auto-generated method stub

        }

        public void onPageScrollStateChanged(int arg0) {
            // TODO Auto-generated method stub

        }
    });

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