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Questions tagged [android-adapter]

An Adapter object acts as a bridge between an AdapterView and the underlying data for that view.

An Adapter represents the connection between a View with some kind of data source. Adapters generally come in two flavors: those that represent array/list based data and those that represent Cursor based data.

  • The Adapter provides access to the data items.
  • The Adapter is also responsible for making a View for each item in the data set.

See Adapter reference for more information.

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3159 questions
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ViewPager2 adapters - difference between FragmentActivity / Fragment / FragmentManager

I noticed in this ViewPager2 video that there are 3 different ways of declaring an adapter with Fragments. What's the difference between them and which 1 should be used for swipe views with tabs using ViewPager2? Option 1 (recommended) class…
SD826E
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Adapter does not update

When switching to Detail, the RecyclerView list is not updated, but rather, I get a blank screen when returning as in the picture. I know that when using NavigationUI, Fragment is recreated. In the code below, returning results in ruleAdapter! =…
pie
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How do I get the quantity from every item in cart and pass to an activity?

i have a cartactivity and cartadapter, in cartadapter i add increment and decrement for each stuff, and i sum it in total price and total weight and send it to activity ( it worked by passing textview activity from cartactivity to adapteractivity )…
Firdaus The Gamer
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RecyclerView List items not displaying nor playing

After coding a recyclerView MediaPlayer, the item lists refused to display after testing with emulator. I don't know what to do. Please your help is very important to me. All the codes below is what i tried that didn't work. This is the…
Joseph
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When changing list item layout RecyclerView scrolls to top

In my RecyclerView OnLongClicking an item I want to change that item's layout by setting some TextViews to View.GONE and others to View.VISIBLE. Everything works except that when I long press the item and the layout changes my RecyclerView scrolls…
MakinTosH
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getView function function in adapter class is running in infinite loop, after fetching profiles from the server?

My adapter code public class profiles_adapter extends ArrayAdapter { Context context; public profiles_adapter(Context context, int resourceId, List items) { super(context, resourceId, items); this.context =…
kaku
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is there a way to create fragment from a activty-adapter imagebutton?

i need to create a fragment from activty-adapter on imagebutton click and to pass 3 data along having trouble with fragment or it says android.app.Application cannot be cast to android.app.Activity please help someone code is in the image code i…
Rosbin Thomas
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Put a vertical viewpager just showing items, within a recyclerview

I'm hoping someone can show me the ropes of hopefully ViewPager2, but I'm basically in need of making a viewpager where I can swipe between different images. I will have a category, let's call it Category A. Category A can have multiple items in…
Mikkel Larsen
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Recycler view adapter now displaying data in fragment

I am trying to display data from my database in my fragment through recycler view. I used a for loop to go through all the users in my database. All the users who are neither friends nor have sent requests should be displayed as implemented in the…
Mafaz Ahsan
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Pass variable to adapter from class

I am trying to pass a string variable from a fragment class to its adapter. The code written in the fragment class is : public class RequestPendingFragment extends Fragment { FirebaseUser firebaseUser =…
Mafaz Ahsan
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Removed item from Adapter not rearanged

I'm making an app that adds to a cart a bunch of items, now, I have this UI that adds an item with the + button and deletes it from the array if I press the - button when 1 is at the quantity. I have an array of items (ITEM A, ITEM B), I can add…
CoffeeBreak
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Is there some adapter listener in Android recyclerView?

I wanna change checkedTextView's boolean state in activity when some event occurs in adapter(Maybe RecyclerView). I thought the way using getter and setter first, but that's not good idea. So I thought listener. Is there listener can get event in…
OverEasy
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How the textViewResourceId assigned by android while using ArrayAdapter

I am new to Android so forgive me if this is an obvious one, i am still trying to understand the workflow. I am following a tutorial and I have created a listView and an ArrayAdapter. ArrayAdapter adapter = new…
blackened8333
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how settext item adapter using tag html like description?

I want to setText with Divider a conversation based on the tag in the adapter like a photo What should I do?
parisa
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dataSnapShot.getValue() returns null eventhough data exits in the database

I am using Firebase as a back-end system and I am also using the Recycler View for displaying the data to the user. But when fetching data from the database the getValue() method returns null. I have attached my code below: public class Post { …
Aswin Raj K
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