It is introduced in Marshmallow. It is an advanced version of the ListView with improved performance and other benefits. RecyclerView is mostly used to design the user interface with the fine-grain control over the lists and grids of android application. In this tutorial, we will create a list of items with ImageView for the icon and TextView for description using RecyclerView and performs click listener on the item of its list. Create an Android project, and add the RecyclerView support library com.

Create a border. Create a MyListData. This class is used as POJO class which sets the properties of the items. Create a MyListAdapter.

recyclerview onitemclicklistener example kotlin

This class extends RecyclerView. Adapter class and override its unimplemented methods. In the onBindViewHolder method each data items are set to each row.

Finally, in the MainActivity. This class creates the array of items for MyListData class and set the adapter class to RecyclerView. JavaTpoint offers too many high quality services. Mail us on hr javatpoint. Please mail your requirement at hr javatpoint. Duration: 1 week to 2 week. Android Training Android Tutorial.

RecyclerView; import android. LayoutInflater; import android. View; import android. ViewGroup; import android. ImageView; import android. RelativeLayout; import android. TextView; import android. AppCompatActivity; import android. Bundle; import android. LinearLayoutManager; import android. Next Topic. Spring Boot. Selenium Py. Verbal A. Angular 7. Compiler D.

OnScrollListener

Software E. Web Tech. Cyber Sec. Control S.By loading the video, you agree to YouTube's privacy policy. Learn more. Load video. Always unblock YouTube. In this video we are going to create an OnItemClickListener interface to handle click events like we would do it in a ListView.

We will set our MainActivity as the listener to this interface.

Kotlin Recyclerview Button Android Tutorial With Example

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Android RecyclerView List Example

Show less. RecyclerView; import android. LayoutInflater; import android. View; import android. ViewGroup; import android. ImageView; import android. TextView; import java. RecyclerView. LayoutInflater. View. ViewGroup .As you know we can use RecyclerView in Android to populate long lists. Using RecyclerView we cannot only populate vertical lists. In this article, we will discuss how you can show vertical list in Kotlin using RecyclerView. By following the code explained in the article, you can make the list the same as shown in the image below.

If you have not added RecyclerView Dependency yet. Open your App level build. First of all, we need to create a list item XML file. Create a Kotlin file with the name CustomAdapter. Now the last step, initialize this RecyclerView in your Activity and assign Adapter to it, as shown below.

In this example, as you can see in the above code, I have put hard-code string with numbers from 1 — 50 to populate my list. But you can populate it with your own data according to your requirements. Here you can find many other helping Android Tutorials. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Post Comment. This site uses Akismet to reduce spam. Learn how your comment data is processed.

Begin typing your search term above and press enter to search. Press ESC to cancel. Skip to content AndroidKotlin. Asad Ali Choudhry April 14, April 14, Please share this post:.

Leave a Reply Cancel reply Your email address will not be published. AndroidJava November 14, November 15, Android October 28, October 28, AndroidDesign April 1, April 1, AndroidJava November 11, November 13, Search for: Begin typing your search term above and press enter to search.Darryl Bayliss wrote the original and Rod Biresch provided the original update. Recycling is good for the planet. Applying this concept to development, Android engineers realized recycling can also make an OS run efficiently.

The result? Recycling enthusiasts and developers alike rejoiced at the release of the RecyclerView widget for Android Lollipop. Google announced a support library to make this clean, green recycling machine backwards compatible all the way to Android Eclair 2. More celebration! Ready to blast off? Review our introductory tutorials for a refresher! Get the starter project using the Download Materials at the top or bottom of this tutorial and open it in Android Studio.

To get a key, put your name and email address into api. Next, copy the API key and open the strings. Consider the next section your mission brief. Android used to use ListView or GridView classes for displaying lists. However, in a RecyclerView, there are features that separate your code into maintainable components even as they enforce memory-efficient design patterns. How could it be better than the tried and tested ListView and GridView? The answers are in the details. You create a row layout for the items and use that layout inside your adapter.

You inflate your item layout in getViewreferencing each view with the unique ID you provided in XML to customize and add view logic.

Or is it? ListViews and GridViews only do half the job of achieving true memory efficiency. All this calling around can become processor-intensive, especially for complicated layouts. Furthermore, the situation can cause your ListView scrolling to become jerky or nonresponsive as it tries to grab view references.

Android initially provided a solution to this problem on the Android Developers site with smooth scrolling via the power of the View Holder pattern. With this pattern, a class becomes an in-memory reference to all the views needed to fill your layout. You set the references once and reuse them, working around the performance hit that comes with repeatedly calling findViewById. The arrival of the RecyclerView changed everything.

It still uses an Adapter to act as a data source; however, you have to create ViewHolders to keep references in memory. To provide a new view, RecyclerView either creates a new ViewHolder object to inflate the layout and hold those references, or it recycles one from the existing stack. Because it requires a ViewHolder, the RecyclerView knows which animation to apply to which item and adds them as required. You can also create your own animations and apply them as needed.In this article, we add a click listener to a RecyclerView on Android.

Advanced language features of Kotlin make it far easier than it has been with Java. However, you need to understand a few core concepts of the Kotlin language.

To get started with the RecyclerViewfollow the steps in the previous article or check out the finished project on GitHub. To understand the most elegant way of adding click handlers to Android, you need to know about higher-order functions and how Kotlin handles those. In Kotlin, you can write the primary constructor directly into the class definition.

recyclerview onitemclicklistener example kotlin

All parameters are automatically available as properties within that class. Note that the keyword constructor is optional; you can skip it. As you can see in the code above, the function calculate directly accesses the properties a and b. This is something Kotlin has done for us. The Kotlin documentation describes: higher-order functions take another function as parameter or return a function.

This function takes a function parameter. We give it the name performCalculation. The name is needed to call the function from within our code. Therefore, we specify that the caller needs to supply a function that has two Int parameters. Additionally, the function has to return an Int. Our testFunctionParameters function simply executes the supplied function and logs the results.

How can we call such a function that expects function parameters? Either, we simply supply a function that is built with a matching structure. Another option is to use lambda expressions. We use lambdas as anonymous functions. We call our higher-order function testFunctionParameters. The contents of labmda follow the definition from above. First, we specify the parameters. Our lambda function takes two parameters, which we call a and b. Both are of type Int.As you know we can use RecyclerView in Android to populate long lists.

Using RecyclerView we cannot only populate vertical lists. In this article, we will discuss how you can show vertical list in Kotlin using RecyclerView. By following the code explained in the article, you can make the list the same as shown in the image below.

If you have not added RecyclerView Dependency yet. Open your App level build. First of all, we need to create a list item XML file. Create a Kotlin file with the name CustomAdapter. Now the last step, initialize this RecyclerView in your Activity and assign Adapter to it, as shown below. In this example, as you can see in the above code, I have put hard-code string with numbers from 1 — 50 to populate my list.

But you can populate it with your own data according to your requirements. Here you can find many other helping Android Tutorials. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Post Comment. This site uses Akismet to reduce spam. Learn how your comment data is processed. Begin typing your search term above and press enter to search. Press ESC to cancel. Skip to content AndroidKotlin. Asad Ali Choudhry April 14, April 14, Please share this post:.

Leave a Reply Cancel reply Your email address will not be published. AndroidKotlin April 12, April 12, AndroidKotlin November 13, November 16, Posted by: admin April 10, Leave a comment.

I am working with my colleagues on library providing such extensions. My solution is like a combination of the previous ones with a super clean call from the activity. In case anyone is looking for a more no-frills answer, I tried the following — which is very similar to the solution from AfzalivE :.

In my Adapter class I passed the clickListener as a parameter. Then I passed my object as parameter without need for searching it on a list again and handle it directly on my Activity class, in the moment I set the adapter:. If you need to get the position of the clicked item, just define it as parameter on the callback and then send it back later.

And on MyActivity. Like this:. Sorry for the delay, Got an awesome answer from this link and it was in Java. Did some Homework and converted it to Kotlin. I think the most elegant solution is to give this responsibility to recyclerView and not to view or even adapt it. In RecyclerView you can put click on inflated view inside ViewHolder class and call it from onBindViewHolder callback method for example:.

Best practice; use Higher-Order Function. Just add a Higher-order func. Write this function to your bind function as parameter and set this to itemView Like that :. And now you can write your onClick function in any activity or fragments.

Just give as parameter. Here is my MainActivity. It has a simple on item click listener interface that you can implement.

recyclerview onitemclicklistener example kotlin

My simple solution using higher-order function and let scoping function to set listener only if itemAction has been set. OH what the heck someone might like this We all place edit and trashcan images in out recyclerview and would like something to happen when they are clicked. Here is our Kotlin example. I posted full example which also reduces your adapter code as well.

recyclerview onitemclicklistener example kotlin

It uses the old pattern of getting callback. I came up with this solution to open an activity when row is clicked, using a companion object and interface. The activity is opened from main activity since I had to save list state before leaving. Here is a simple approach without using an interface, just in your adapter create an init block within viewholder class. Like this. Tags: androidandroidlistview. April 10, Android Leave a comment.

Questions: Can someone tell me the code to convert image into byte array and that byte array into base64 string.


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