android - 我在 ViewPager2 中找不到 PageChangeListener。？

Question

ViewPager2 PageChangeListener 不像普通的 ViewPager 那样工作。？

Answer 1

有一种registerOnPageChangeCallback方法：

pager.registerOnPageChangeCallback(object: ViewPager2.OnPageChangeCallback() {
            override fun onPageScrolled(
                position: Int,
                positionOffset: Float,
                positionOffsetPixels: Int
            ) {
                super.onPageScrolled(position, positionOffset, positionOffsetPixels)
            }

            override fun onPageSelected(position: Int) {
                super.onPageSelected(position)
            }

            override fun onPageScrollStateChanged(state: Int) {
                super.onPageScrollStateChanged(state)
            }
        })

Answer 2

下面是 ViewPager2 中 OnPageChangeListener 的示例代码。

class ViewPager2PageChangeCallback(private val listener: (Int) -> Unit) : ViewPager2.OnPageChangeCallback() {
    override fun onPageSelected(position: Int) {
            super.onPageSelected(position)
            when (position) {
               //YOUR CODE
            }
        }
    }

Answer 3

在 Java 中可以这样编码：

mViewPager.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
    @Override
    public void onPageScrolled(int position,
            float positionOffset, int positionOffsetPixels) {
        super.onPageScrolled(position, positionOffset, positionOffsetPixels);

        setProgress((position + positionOffset) / (mPageCount - 1));
    }
});