uahas.blogg.se - Android studio recyclerview tutorial

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How to Create a Unlock Slide-Bar in Android?.NestedScrollView in Android with Example.How to create a nested RecyclerView in Android.Android | Horizontal RecyclerView with Examples.CardView using RecyclerView in Android with Example.ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.If you’ve found this tutorial useful, you may want to try View Binding to remove some boilerplate findViewById calls. This way, if we had provided the adapter with a list of 1000 OrderItem objects, it only needs to create a few dozen (or fewer) views, saving a huge amount of resources. The RecyclerView will call onBindViewHolder with the item that’s about to appear, and re-use an existing OrderViewHolder. Each time a new item is about to appear on the screen, The adapter will create roughly as many OrderViewHolder objects as can fit on the device’s screen.Īs the user scrolls, list items will move off the screen. That’s it! Running the application should now display a list of OrderItem objects. Create a LayoutManager and set it as the RecyclerView’s layout manager property.Set the RecyclerView’s adapter to be the OrderAdapter you just created.Obtain a reference to the RecyclerView with findViewById.Create an instance of your OrderAdapter, providing it with the list of items.These would typically be fetched from your data access layer or a RESTful API call. Create a list of items to be displayed by your adapter.layoutManager = LinearLayoutManager ( this, RecyclerView. Val items = listOf ( OrderItem ( "123", "Order 123" ), OrderItem ( "234", "Order 234" ) ) val orderAdapter = OrderAdapter ( items ) val recyclerView = findViewById ( R.

In your Activity or Fragment layout, the RecyclerView can be used as follows:

The adapter should extend RecyclerView.Adapter, using your ViewHolder class as the type argument.

onBindViewHolder should update the view holder with the item at the provided position.

onCreateViewHolder should inflate the XML layout of our list item we created earlier and create an OrderViewHolder from it.

getItemCount should return the number of items in our list.

This represents the re-useable view of a single list item and should extend RecyclerView.ViewHolder.

There is a nested class called OrderViewHolder.

The adapter has one construction parameter: The list of items to be displayed.

To keep the tutorial simple, the list will be immutable. This adapter is going to display a list of OrderItem objects. You might already have a list of items however, I normally createĪ small DTO class that encapsulates the minimum amount of fields we need to display in the list.Ĭlass OrderAdapter ( private val orders : List ) : RecyclerView. The list will need a list of items to display.