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viewPager.setOffscreenPageLimit(adapter.getCount() - 1);

デフォルトだと見えてない部分のページ数が1に設定されているらしく、全体として3ページ以上になる時は、 ViewPager#setOffscreenPageLimitを自分で設定しないと2ページめくる度にフラグメントがインスタンス化されてしまうみたい。

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