Replace ViewPager with ViewPager2 to achieve better performance. #880
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Above of all, please let me show the appreciation of this project.
But a little problem came to me when I migrated the codes to my own project. That is, ViewPager's performance is not good enough. Whenever a preview page is slided in, a new PreviewItemFragment is crated.
So I replace ViewPager with ViewPager2, which automatically caches one page on each side of the current preview page.
I hope it will be helpful to the project :)