如何在给定项目处获取 ViewPager 的子视图

How do I get the child View of a ViewPager at a given item(如何在给定项目处获取 ViewPager 的子视图)

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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