What is the RecyclerView? What is it used for? What is the Adapter used for?

What is the RecyclerView? What is it used for? What is the Adapter used for? How is a ViewHolder created, and how is it used by the RecyclerView? What happens when we scroll a RecyclerView? What is the difference between creating a ViewHolder and binding a ViewHolder? Do these operations happen at the same time? How do we create the view for a specific row? Can we have different ViewHolders that are used with the same RecyclerView and Adapter?

What is the ConstraintLayout? Why may we want to use a ConstraintLayout instead of a LinearLayout? What kinds of constraints can be added?

Expert Solution

RecyclerView in Android platform is an important component that is present often in many Android apps. Just like ListView, Android recyclerview is used to display large amount of items on screen, but with improved performance and other benefits

The RecyclerView is a ViewGroup that renders any adapter-based view in a similar way. It is supposed to be the successor of ListView and GridView. ... Adapter - To handle the data collection and bind it to the view. LayoutManager - Helps in positioning the items.

the views in a RecyclerView are recycled as you scroll down. This means that you need to keep the state of each item in your backing model, which in this case would be a Historyitem , and restore it in your onBindViewHolder

To create a view, a user must have the appropriate system privilege according to the specific implementation. CREATE VIEW view_name AS SELECT column1, column2..... FROM table_name WHERE [condition]; You can include multiple tables in your SELECT statement in a similar way as you use them in a normal SQL SELECT query.

A ConstraintLayout is a android. view. ViewGroup which allows you to position and size widgets in a flexible way. Note: ConstraintLayout is available as a support library that you can use on Android systems starting with API level 9

In general, the idea behind ConstraintLayout is that it allows you to position all of your children without having to nest any other ViewGroup s inside the ConstraintLayout

venereology answered 2 years ago

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