Android ViewPager动画 [英] Android viewpager animation

问题描述

我希望在此函数调用后动画结束时得到通知：

I would like to be informed when the animation ends after this function call:

viewPager.setCurrentItem(2, true);

有人知道如何做到这一点吗？

Does anyone know how to accomplish this?

推荐答案

我遇到了同一问题。
以下是我的结论：

I have come across the same issue. the following is my conclusion:

当页面实际更改时，将调用onPageSelected。
但它在动画之前被调用。

When the page is actually changed onPageSelected will be called. But it's called before the animation.

动画停止后，将以状态SCROLL_STATE_IDLE调用onPageScrollStateChanged。

When the animation stopped , onPageScrollStateChanged will be called with state SCROLL_STATE_IDLE.

因此，您必须结合这两个函数调用才能调用函数。

So you have to combine this two function calls to get your function called.

祝你好运。

private class PageChangeListener implements OnPageChangeListener {

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
   }

    @Override
    public void onPageSelected(int position) {
        isPageChanged = true;
    }

    @Override
    public void onPageScrollStateChanged(int state) {
        switch (state) {
        case ViewPager.SCROLL_STATE_IDLE:
            if (isPageChanged) {
                updateCurrentPage();//this will be called when animation ends
                isPageChanged = false;
            }
            break;
        case ViewPager.SCROLL_STATE_DRAGGING:
            break;
        case ViewPager.SCROLL_STATE_SETTLING:
            break;
        }
    }
}

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