问题描述
我用我的 ViewPager
实例都相当耗费资源的片段,所以我只希望加载一次。当我尝试以下方法:
mViewPager.setOffscreenPageLimit(0);
mViewPager.setAdapter(mPagerAdapter);
我的 FragmentStatePagerAdapter.getItem(INT位置)
替代函数被调用的3倍,这是当我打电话会发生什么 mViewPager.setOffscreenPageLimit(1)
。我希望它只能被调用一次,因为我指定的0屏幕外的页面。
我相信我正确地调用一切,因为如果我叫 mViewPager.setOffscreenPageLimit(2)
, FragmentStatePagerAdapter.getItem(INT位置)
被称为5次,因为我期望的那样。
是否ViewPager至少需要1屏幕外的页面,还是我做错了什么吗?
是的。如果我正确读取源$ C $ C,你应该得到的LogCat中有关此警告,是这样的:
请求的屏幕外的页数限制0过小;默认为1
The fragments I use in my ViewPager
instance are quite resource intensive, so I'd only like to load one at a time. When I try the following:
mViewPager.setOffscreenPageLimit(0);
mViewPager.setAdapter(mPagerAdapter);
My FragmentStatePagerAdapter.getItem(int position)
override function is called 3 times, which is what happens when I call mViewPager.setOffscreenPageLimit(1)
. I would expect it to only be called once, because I specified 0 offscreen pages.
I believe I'm calling everything correctly, because if I call mViewPager.setOffscreenPageLimit(2)
, FragmentStatePagerAdapter.getItem(int position)
is called 5 times as I would expect.
Does ViewPager require a minimum of 1 offscreen pages, or am I doing something wrong here?
Yes. If I am reading the source code correctly, you should be getting a warning about this in LogCat, something like:
Requested offscreen page limit 0 too small; defaulting to 1
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