RecyclerView is developed with kotlin for your next awesome android app. RecyclerView and Kotlin both are updated items for android app development. Kotlin is updated from Java and RecyclerView is updated from Listview. So this tutorial can be handy helpful for you to update with latest trends in android app development. Click here to download images and add them into the drawable folder. You should learn here how to add images in drawable folder in the step 2 of circular progressbar example android.
No need to create xml file in drawable, just copy and paste images in drawable. Create a new file into drawable folder. Tags: android Kotlin recyclerview. May 10, April 17, August 20, I want to fetch location latitude and longitude every 1 minute, my code is not working above android version 8 and oppo, vivo,mi,poco mobile.
Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. April 9, at am. Sarat says:. May 15, at am. Leave a Reply Cancel reply Your email address will not be published. Search Tutorials Search for:. Context import android. RecyclerView import android. LayoutInflater import android.
View import android. ViewGroup import android.
ImageView import android. TextView import java. AppCompatActivity import android. Bundle import android. LinearLayoutManager import android. Log import android. GestureDetector import android. MotionEvent import android. Toast import java.There are many ways to achieve this, but I will show you the way I usually do it. My mechanism consists of passing the listener as a parameter to the constructor and then assign it when I bind the data to the view in onBindViewHolder. In this example, there is a sample model called ContentItemso the click will return an item of that type:.
The constructor will receive an object that implements this interface, along with the items to be rendered:. You could alternatively create a setOnItemClickListener method and assign it that way. Use it whenever you need it by creating a new adapter and the listener that will implement the behaviour when an item is clicked. A simple example:. Take a look at the whole code of this adapter. Of course there are many alternatives here. In the end, the implementation is left to the developer when using RecyclerViewso choose whatever fits better in your situation.
Want to learn Kotlin? Check my free guide to create your first project in 15 minutes! This is a great example, thanks! If we put object creation code inside onBindViewHolder method, is it good? Since onBindViewHolder will always be called if we scroll the content.
I usually come up with passing the listener and list of object to ViewHolder constructor, that will be called in onCreateViewHolder. For the position, i use getAdapterPosition. Please advice, thank you. There are solutions to that with a little more code, of course. Adapter adapter; private RecyclerView. Thats a nice example, very cleanly written. Avoids re-adding new listeners.
Hence whenever onBindViewHolder is called, it saves a little bit of time. I do have one request, could you please write another write up showing how it is achieved thoughtfully using data binding? Hello Antonio, nice article If we have a complex itemView for each row of RecyclerView then creating a new OnClickListener in each time we want to show a row is a performance issue, Consider a row which has different buttons and each button does somethingso I came up with this solution: in onCreateViewHolder method after creating the ViewHolder object we set our click listeners like this : mViewHolder.
OnClickListener interface doing so causes each row displayed on screen lets say 5 rows is shown at same time in the screen be called only once! OK,now we have to find a way to distinguish between click listeners for different positions, what we do is: in onBindViewHolder method we set the ViewHolder parameter of function as Tag of each view that we want to set click listener like this: mViewHolder.
In that case, I prefer to create a custom view, and let it deal with its own events. I have come to use an event bus instead of onClickListeners, it allows you to assign a private listener in onBindViewHolder that just fires an event.Salute e sicurezza sul lavoro
I want to make selction menu for profiles using RecyclerView. I created it with RecyclerView. Now i am getting problem in onItemClickListener.
Kotlin Recyclerview Tutorial With Example CardView Item Click Image Text
I want to change background of CardView and Text Color on item select. And on next button click it should redirect to activity according to selection. Your approach of using an Index variable is right, add getter and setter method for the index. But you can't set the onClickListener on the adapter. Use your card view as a parent layout for your recycler view item and apply on click listener to that card view in recycler view adapter.
It returns to call the method of onItemClick which implements this method. This is the safe and sound method to click on each item or any view in the item. Learn more. Ask Question. Asked 1 year, 2 months ago. Active 1 year, 2 months ago. Viewed times. Ajay Gohel Ajay Gohel 10 10 bronze badges. If you want the whole click, simply use holder. I updated code but there is still some problem. It is selecting item but also selecting other items randomly. Active Oldest Votes. Hasanuzzaman Mamun Hasanuzzaman Mamun 1 1 silver badge 9 9 bronze badges.
See my updated answer. I've updated it. Abhilash Harsole Abhilash Harsole 2 2 gold badges 2 2 silver badges 12 12 bronze badges.Roblox skyblock dupe glitch
Mayank Sharma Mayank Sharma 1, 11 11 silver badges 17 17 bronze badges. ViewHolder implements View. Longalei Longalei 8 8 bronze badges. AjayGohel I test the code, it not appear what you said. Tanveer Munir Tanveer Munir 1, 1 1 gold badge 6 6 silver badges 24 24 bronze badges.
I'm writing my first app in Kotlin after 3 years of experience with Android. But I'm still not satisfied with this because I think there might be a better, cleaner way. I'm trying to essentially achieve something like this: RecyclerView onClick. 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. Note : I needed a reference from my list item's container the root viewwhich in this case is containerView. 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:.
Kotlin RecyclerView with Click Listener
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.Android recyclerview Click event
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:. You don't need to write extension function to ViewHolder or something like this. 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. 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. 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. Learn more. Asked 5 years ago.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.Difference between pu paint and enamel paint
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.
The last and most interesting component of a RecyclerView is its LayoutManager. The ListView used to do this work alone. The RecyclerView has broken out this functionality to allow for different kinds of layouts: Vertical, horizontal, grid, staggered or your own! Create your own LayoutManagers to use with a RecyclerView if you want extra customization. Step one should be familiar. If you want more information on how to do it yourself, check out the Android developer website.You will have to implement the item clicke listener yourself.
Here is an example of how to implement the view holder item clicker listener in RecyclerView. In a nutshell, The Activity class will implement an interface for onClick event, this interface will be passed to the RecyclerView Adapter class, then the ViewHolder class in the RecyclerView will call onClick method defined in the interface, which will pass the view and position of the clicked item to the onClick implementation in the Activity class.
OnClickListener, bind the listener to the view. The actual implementation of the onclick event will be from an activity or fragment that contains this RecyclerView. The important line here is clickListener. The onClick implementation in the Activity class, the important line here is mAdapter. The layout files are not provided for above sample are not provided since this post is not about layout. Complete example in Github.
Toggle navigation Codexpedia. Defining item click listener for RecyclerView in Android. Search within Codexpedia. Search the entire web. Android load a config file from external Documents directory Android external storage Android write and read to external file Android define different variables for different build types and use it in manifest file.
Android dependency injection koin example Android ExoPlayer 2 track selection example Android playing audio with Exoplayer 2 example Trusting self signed ssl certificate in Android Android enable TLS1.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.
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.Mount nfs failed to apply fstab options
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. The return type Int is inferred automatically by Kotlin: the operation of adding to Integers returns an Integer.
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