What is the use of onBindViewHolder in Android?

This method internally calls onBindViewHolder(ViewHolder, int) to update the RecyclerView. ViewHolder contents with the item at the given position and also sets up some private fields to be used by RecyclerView. This method calls onCreateViewHolder(ViewGroup, int) to create a new RecyclerView.

What is recycler view in Android?

RecyclerView is the ViewGroup that contains the views corresponding to your data. It’s a view itself, so you add RecyclerView into your layout the way you would add any other UI element. … After the view holder is created, the RecyclerView binds it to its data. You define the view holder by extending RecyclerView.

How often is onBindViewHolder called?

However, in RecyclerView the onBindViewHolder gets called every time the ViewHolder is bound and the setOnClickListener will be triggered too. Therefore, setting a click listener in onCreateViewHolder which invokes only when a ViewHolder gets created is preferable.

What is the adapter responsible for?

An Adapter object acts as a bridge between an AdapterView and the underlying data for that view. The Adapter provides access to the data items. The Adapter is also responsible for making a View for each item in the data set.

What does a RecyclerView adapter do?

The adapter prepares the layout of the items by inflating the correct layout for the individual data elements. This work is done in the onCreateViewHolder method. It returns an object of type ViewHolder per visual entry in the recycler view.

What is the use of Inflater in Android?

What is an Inflater ? To summarize what the LayoutInflater Documentation says… A LayoutInflater is one of the Android System Services that is responsible for taking your XML files that define a layout, and converting them into View objects. The OS then uses these view objects to draw the screen.

Why do we need RecyclerView in Android?

In Android, RecyclerView provides an ability to implement the horizontal, vertical and Expandable List. It is mainly used when we have data collections whose elements can change at run time based on user action or any network events. For using this widget we have to specify the Adapter and Layout Manager.

How many times onCreateViewHolder called?

On reviewing LogCat I noticed that onCreateViewHolder was called twice after it was instantiated. Also onBindViewHolder was called twice though I know it is called whenever the items are recycled.

What is onBindViewHolder ()?

onBindViewHolder(VH holder, int position) Called by RecyclerView to display the data at the specified position. void. onBindViewHolder(VH holder, int position, List<Object> payloads) Called by RecyclerView to display the data at the specified position.

Why is RecyclerView called RecyclerView?

RecyclerView as its name suggests recycles Views once they get out of scope (screen) with the help of ViewHolder pattern.

What is getView called in Android?

2 Answers. getView() is called for each item in the list you pass to your adapter. It is called when you set adapter. When getView() is finished the next line after setAdapter(myAdapter) is called.

What is the use of notifyDataSetChanged in Android?

notifyDataSetChanged() – Android Example [Updated]

This android function notifies the attached observers that the underlying data has been changed and any View reflecting the data set should refresh itself.

Which is better ListView or RecyclerView?

Simple answer: You should use RecyclerView in a situation where you want to show a lot of items, and the number of them is dynamic. ListView should only be used when the number of items is always the same and is limited to the screen size.

When should I use RecyclerView?

Use the RecyclerView widget when you have data collections whose elements change at runtime based on user action or network events. If you want to use a RecyclerView , you will need to work with the following: RecyclerView. Adapter – To handle the data collection and bind it to the view.

What is RecyclerView in android with example?

RecyclerView is a ViewGroup added to the android studio as a successor of the GridView and ListView. It is an improvement on both of them and can be found in the latest v-7 support packages.

Leave a Comment