Android ViewPager，中心项目更大

Question

我想创建一个带有
的ViewPager - 所选中心项目比其他项目大 - 前一部分和一部分下一个项目始终可见。

我正在使用viewPager.setPageMargin(-20);制作Previous＆amp;的一部分下一项可见。但是，如何使选定的中心项目比其他项目略大。

Answer 1

您可以在onPageSelected（）方法中将Layout参数设置为x％。

     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

        }
    });