How to update adapter items in viewpager

Question

我有3个页面的viewPager() ，它有一个recyclerView ，每个页面都有三个不同的适配器，我想要类似的东西，例如当用户单击第一页中的适配器项时，它将添加到数据库中，第二个适配器从相同的数组中获取其数组列表数据库，但它在应用程序重启后显示在第二页的适配器中，因此问题是如何在不重启的情况下更新第二页的适配器。

Answer 1

A regular ListView can use a CursorAdapter which provides some of the functions you need. Alas, there is no existing CursorAdapter class that extends RecyclerView.Adapter .

The quickest solution would be to use RecyclerViewCursorAdapter on GitHub.

Then it would work something like this:

• Update your database
• Get a reference to your second page fragment. You can store this reference when you create the fragment in getItem() . Note that your fragment could be null depending on what pages the ViewPager has/hasn't created.
• Call a method on your fragment that will create a new Cursor to be used by the adapter (with the same query as before). When the adapter receives the new Cursor it will update the RecyclerView .