问题描述
我会尽量让问题简短而简单.
I'll keep the question as short and simple as humanly possible.
View activeView = mViewPager.getChildAt(mViewPager.getCurrentItem());
在当前项为 0 和 1 时返回子视图.但如果当前项为 2，则返回 null .这是为什么呢?
returns the child view when the current item is 0 and 1. But if the current item is 2 it returns null . Why is that?
edit:让我重新表述一下自己.如何在任何给定项目位置获取 ViewPager 的子视图?
推荐答案
事实证明 getChildAt(int) 不是正确的方法.我所做的是检索 ViewPager 中使用的适配器并从那里找到我的视图:
It turns out getChildAt(int) was not the right approach. What I did was retrieve the Adapter used in the ViewPager and found my views from there:
adapter = mViewPager.getAdapter();
Fragment fragment = adapter.getItem(mViewPager.getCurrentItem());
View activeView = fragment.getView();
如前所述，除非通过 setOffscreenPageLimit()
As already noted the viewPager will only contain the current child and adjacent children(currentItem() +/- 1) unless otherwise specified through setOffscreenPageLimit()
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