Expandable recyclerview android

Expandable Recycler view is alternative of ExpandableListView. It fails in the coordinator layout as well as have layout height issue. SubcategoryParentListItem is our parent class that is used to store the data relevant to parent. SubcategoryChildListItem is our simple child class used to display the content in each child of parent.

IllegalStateException: Null object added at com. We use cookies to personalize your experience. By continuing to visit this website you agree to our use of cookies. Learn more about privacy policy. Shubham Agarwal 29 April Custom Parent and Child Classed used to represent the relationship SubcategoryParentListItem is our parent class that is used to store the data relevant to parent. Comments 10 Cancel reply Add Your Comment. Thanks in advance. This is because we are binding the views using this adapter.

Shubham Agarwal December 26, at pm Child are automatically expanded if child item list is neither null and nor empty.

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How to make a child item on expandablelistview open a new activity

Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. The idea is that there is a parent list, when an list item in the parent list is tapped, that list item reveals a child list that contains it's own data.

I've tried to get it working for the past 3 days to no avail. I tried using the AdvancedReyclerview library but to a beginner like me, it was a giant mess of things that didn't make sense especially when passing in the data. I copied and pasted files that I needed to get a minimal working version but I had no idea how to pass my data into the recyclerview and how to update it with the newly selected value. Any thoughts on that? You can check my library in here. You can easily achieve it with this librarythere is a full example here.

Learn more. Creating an expandable RecyclerView Ask Question. Asked 4 years, 11 months ago. Active 1 month ago. Viewed 36k times. I'm trying to implement a recyclerview that behaves like my sketch below: The idea is that there is a parent list, when an list item in the parent list is tapped, that list item reveals a child list that contains it's own data. Is it even possible to do what I'm trying to do or am I way out of my depth here? If it's still difficult to understand, I can explain it more.

Darush 7, 4 4 gold badges 43 43 silver badges 47 47 bronze badges. Active Oldest Votes. Shweta Chauhan Shweta Chauhan 4, 3 3 gold badges 21 21 silver badges 42 42 bronze badges.

Umasankar : I think whole code is here. If you update result screenshot Image above, it may look cool! Anyone can explain to me what is going on in the code? SimpleGroupViewHolder parent. Ali mohammadi Ali mohammadi 13 13 silver badges 22 22 bronze badges.

Gustavo Gustavo 4, 4 4 gold badges 28 28 silver badges 60 60 bronze badges. Pushpendra Pushpendra 2, 4 4 gold badges 18 18 silver badges 43 43 bronze badges. Spartan, I checked their example but found it hard to follow. What do I need to add to the project to start using their extended library? Is there anything else other than the compile directory, do I need to copy any lib files to my project?

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expandable recyclerview android

Sign up using Email and Password. Post as a guest Name.Hello guys, welcome to another useful post Expandable RecyclerView Android. You might already know we use RecyclerView to display a List of data in our application. This time we will do the same we will create a RecyclerView, but the items of the RecyclerView will toggle on tapping.

So initially some details of the list items will be hidden, and when we tap on the item it will show us the remaining detail by expanding itself. Sounds confusing? Hope you found it helpful. For any queries or feedback, you can leave your comments below. And I will soon post some more useful content for you. In this blog I write tutorials and articles related to coding, app development, android etc. Hello sir, How to pass prams to our URL when select drop-down option, using retrofit or volley.

Please solve my issue. I am newbiee to android development. Hello Sir, I need Expandable listview with collapse and expand with image ,textview and edittext. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Notify me of follow-up comments by email. Notify me of new posts by email. Expandable RecyclerView Android.

By earlybefore America's entry into World War II, Rogers is a tall, scrawny fine arts student specializing in illustration and a comic book writer and artist. List Layout.

Context; import android. RecyclerView; import android. AutoTransition; import android. TransitionManager; import android. LayoutInflater; import android. View; import android. ViewGroup; import android. Animation; import android. AnimationUtils; import android. ImageView; import android. LinearLayout; import android. TextView; import android.

Toast; import com. Glide; import java. Context. RecyclerView. AutoTransition .Android ExpandableListView is a view that shows items in a vertically scrolling two-level list. It differs from a ListView by allowing two levels which are groups that can be easily expanded and collapsed by touching to view and their respective children items. ExpandableListViewAdapter in android loads the data into the items associated with this view. In the above code the expandableListDetail object is used to map the group header strings to their respective children using an ArrayList of Strings.

Expandable RecyclerView with Epoxy

This class extends BaseExpandableListAdapter and it overrides the methods in the base class to provide the view for the ExpandableListView. But these can be easily modified to perform any other operations. This brings an end to Android ExpandableListView tutorial. Thanks for this tutorial. Hi, is it possible to shift the position of items? Like according to your example I want to change the team position as first to display basketball then wants to display cricket after I want to display football Team.

Hihow can i populate Expendable listView using Json from Volley and mysql I have 2 tables Article and commentsotherly how can i use dynamic data.

Android RecyclerView Retrofit | Parse JSON Display RecyclerView Retrofit

The response you get is key-value pair and HashMap stores the key-value data. Hello Team, Thank you for the detailed information. A very nice example for a beginner. If the ExpandabeListView expands off the bottom screen, it does not scroll! Is there a solution to this? SIr…Great work. I have got without any errors.

I have a doubt,…. Hi, This tutorial useful. But i need this expandablelistview as expand and collapse.Create a new project in the android studio. Select Empty activity during the process of making a new project. Create a new JAVA class. Give it a name like RecyclerInterface.

Tags: android JSON recyclerview retrofit. December 7, February 4, May 26, Thanks a lot for the tutorial. Works perfectly. I just have one question. Not working with only http.

expandable recyclerview android

Most of them I got post longer and longer blogs on the same thing but maybe the API are deprecated or some other issues. I do thank you for your help. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.

Expandable RecyclerView

Retrofit library is useful to make http calls seamlessly and it also saves time. Call. GET. Context. RecyclerView. LayoutInflater. View. ViewGroup. ImageView. TextView. Picasso. ArrayList. TextView countrynamecity.

expandable recyclerview android

ImageView iv. AppCompatActivity. Bundle. LinearLayoutManager. Log. Toast .It contains two views one is parent view and other is child view. Parent is visible by default but the child view has to be expanded and collapsed. It will expand when we click on parent view. This feature is quite similar to the ExpandableListView in Android. Since it is an old one, it does not perform well according to our requirement. After adding the library, we have to add some Java classes with the help of this library like Adapter, Model, and View holders.

Get Expandable RecyclerView In A Simple Way

So here in this example we will show Movie category as a parent and movies according to the category are a child. Create this XML file for creating the view of movie category. Add the code inside LinearLayout. Create this class and extend it with ParentViewHolder. It is a class which binds the view. Here we take the reference of MovieCategory view and set the properties when it is expanded and collapsed.

Now, set the properties for expand and collapse of arrow image and its rotation accordingly by implementing two methods setExpanded and onExpansionToggled. Create this custom Adapter class which extends ExpandableRecyclerAdapter. One of which is for parent and the other for the child.

It is in our Main Activity that we pass the data, set the adapter and take the reference of Recycler View. We can save the expanded and collapsed state of items in our Recycler View during our device configuration changes. Other things and also we can store the state of same. Like this, we can save the state. This feature is mainly used in many applications.

We can customize it according to the requirement. It is the same as ExapandableListView but has some new features added. An interesting functionality of Android, it is frequently used by the developers. Android ExpandableListview. HEY thats nice tutorial but can u explain me how do i get the child position in the fragments class and how to make like only one to be expandable if i have 3 views i need only one among them to be opened first please help me put.

You have no need of reference of Fragment view to get its components in Activity. As you can directly access layout components of a Fragment in parent Activity. Simply you can access any component by this findViewById R. May be by using list or array. Please suggest. Hi Yaka, Thank you for asking us and reading our blogs.!! In this code, We are creating objects for all four Movies, so you cannot take it into single line.

Add for all to assign in different Movies objects. Hi, it was a nice tutorial.Introducing Expandable RecyclerView : an open source library for expanding and collapsing groups using RecyclerView. At Google IOGoogle introduced the RecyclerView widget - an entirely updated approach to showing a collection of data. RecyclerView was designed to be more flexible and extendable than its predecessor, ListView. While most of what RecyclerView offers is an improvement over the existing functionality of ListViewthere are a few notable features missing from the RecyclerView API.

Adapter s for expanding and collapsing groups to bring back some of the former glory of ExpandableListView. To understand this library is to understand RecyclerView. According to the docs:. In other words, the adapter is just the middleman: translating indexes from some backing data structure, to views to be passed along to a RecyclerView to be seen on screen.

When you are showing a single dimensional list of objects, this translation is simple. The indexes of the objects in the backing data set directly correspond to the indexes of views displayed on screen.

But when you want to display two dimensional data, like in case of an expandable list, this translation gets a bit more tricky. When the indexes of the views are the same as those of the backing data set, there is only a single truth to maintain. But when those indexes become disparate, so does the source of truth, leaving you with two possible truths.

Me too. Above is music app showing a list of Genre s with corresponding Artist s. The numbers to the left of the phones represent the view indexes. As you can see both phones contain 9 row items. But if you look at row 6, you will see the data on each phone is different. On the left, view index 6 equals the Genre object, Classic while on the right it equals the Artist object, Miles Davis. Enter the double source of truth problem. The view indexes truth numero uno are different from the backing data structure indexes truth numero dos.

The RecyclerView. If you look at all the callbacks and methods on RecyclerView. So to make this whole thing work, all we need some way to translate the two dimensional data to a flattened, single dimensional data set for the adapter to use. ExpandableList acts as a translator between the flat list position i. The only reason we even had to include it as a separate class in this library was because it has package local scope within the Android SDK.

See the full library and instructions for how to use it on Github. Software design and development requires collaborative efficiency—the ability to quickly solve problems together. When a team is remote, productivity can plummet. The What To understand this library is to understand RecyclerView. According to the docs: [RecyclerView] Adapters provide a binding from an app-specific data set to views that are displayed within a RecyclerView In other words, the adapter is just the middleman: translating indexes from some backing data structure, to views to be passed along to a RecyclerView to be seen on screen.

The How Above is music app showing a list of Genre s with corresponding Artist s. The Where compile 'com. Empower your teams to work remotely with thoughtbot Software design and development requires collaborative efficiency—the ability to quickly solve problems together. Learn more about leveling up.


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