![]() ![]() Most of the other examples were written long time with javawhen kotlin had not been introduced to android development. Let’s look at a simple and modern recyclerview example using kotlin and AndroidX. NestedScrollingChild – Provides support for dispatching of nested scrolling operations to a cooperating parent ViewGroup.These includes APIs such as computeHorizontalScrollExtent(), computeVerticalScrollExtent() etc. ![]() ScrollingView – It provides scroll related APIs to RecyclerView.Like anything you can imagine in android or even java at large, a RecyclerView is just a class: class RecyclerView Hence we can work on either without touching the other. Obeys SOC(Seperation of Concerns) A RecyclerView decouples adapter from views. Some may argue that you always need two or three classes however, these are simple classes that can be combined in one file. This is one of the reasons why they are popular. I have seen people using them to build almost anything from creating input forms to scrollable grids to other adapterviews. Flexible RecyclerViews are the most flexible adapterviews in android. They are great for small data sets but not for large. Previously ListViews were and gridviews were the only inbuilt alternatives. Android Engineers introduced RecyclerViews to provide a more efficient way of displaying large data sets. ![]() The end result is smoothness even with large datasets that we and our users can take for granted. So RecyclerView is great in this regard as instead of re-inflating the views, it holds them in a ViewHolder class and then recycles them, only binding fresh data to them. And you can imagine having hundreds of rows or grids of data. And remember this is to be done in realtime as the user scrolls through a list of data. Infation of views is normally expensive as it involves parsing of XML layouts into java objects. AdapterViews normally display collections of data.Įven though there have been various great and popular adapterviews like ListViews, GridViews and expandablelistviews, recyclerview is the best when it comes to displaying large quantities of data.Īnd that’s because of it’s concept of recycling already used views instead of re-inflating them everytime. RecyclerView is meant to work as an adapterview, basically with an adapter that adapts data to the RecyclerView’s views. Be it TextViews, Buttons, checkBoxes etc. RecyclerViews are not limited to any one particular view. And those views are just pieces of grahpical user interface widgets that normally we define in XML and get inflated in java. ListView as you may already know is also an adapterview and allows us display items in a vertically scrolling list. RecyclerViews were introduced in Android API 5 as an alternative to ListViews. He or she comes across the well-known pattern of creating a custom interface with view and position as the parameters.A RecyclerView is an adapterview that allows us display a large data set through just a limited window. Whenever anyone tries to find a way to getAdapterPosition() inside their Activity/Fragment/View. But sometimes the way we think is not always the correct or a better way. I know you must have already found a way to get onItemClickListener() for your RecyclerView Adapter. ViewHolder’s object inside your Activity/Fragment/View. ![]() setTag() inside your ViewHolder and then getAdapterPosition() (…and many other things) from view. **TL DR**Instead of creating a custom ItemClickListener interface to getAdapterPosition() inside your Activity/Fragment/View and end up creating multiple Anonymous Classes under the hood for each item. A lighter way to get that thing done smoothly. ![]()
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