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How to write adapter for recyclerview in android?


Asked by Dennis Matthews on Nov 29, 2021 Android



Default screen margins, per the Android Design guidelines. --> 2. Writing the Adapter Class After adding the RecyclerView widget, let’s start writing the adapter class to render the data. The RecyclerView adapter is same as ListView but the override methods are different. 6. Create a class named Movie.java and declare title, genre and year.
Accordingly,
The view holder objects are managed by an adapter, which you create by extending RecyclerView.Adapter. The adapter creates view holders as needed. The adapter also binds the view holders to their data. It does this by assigning the view holder to a position, and calling the adapter's onBindViewHolder() method.
Just so, The RecyclerView.Adapter, much like the built-in Android ArrayAdapter, will populate the data into the RecyclerView. It also converts a Java object into an individual list item View to be inserted and displayed to the user. Let's look at this image one more time, as we are about to build something very similar:
In this manner,
Using a RecyclerView has the following key steps: 1 Define a model class to use as the data source 2 Add a RecyclerView to your activity to display the items 3 Create a custom row layout XML file to visualize the item 4 Create a RecyclerView.Adapter and ViewHolder to render the item 5 Bind the adapter to the data source to populate the RecyclerView
Besides,
Unlike ListView, there is no way to add or remove items directly through the RecyclerView adapter. You need to make changes to the data source directly and notify the adapter of any changes. Also, whenever adding or removing elements, always make changes to the existing list.