android - 使用add和hide切换fragment时使用addToBackStack后，第一次切换并返回成功，第二次切换显示空白页?

Question

这种问题该怎么解决，不想用replace。

Answer 1

replace requires addToBackStack add and hide, then the fragment still exists, so addToStack is not needed. I don’t know if my understanding is correct.

Answer 2

1. How many fragments are there

2. viewpager sets the number of cached interfaces, setOffscreenPageLimit