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Mastering RecyclerView in Android: Best Practices

Last Updated on July 5, 2024

Introduction to RecyclerView in Android

RecyclerView is a powerful tool in Android development, designed to efficiently display large data sets on screen.

It replaces the older ListView by providing better performance and flexibility.

The RecyclerView widget is a more advanced and customizable version of ListView, offering better control over data presentation.

It is a container for efficiently displaying large data sets that can be scrolled smoothly, even with thousands of items.

Using RecyclerView in Android development has several advantages over ListView.

Firstly, it simplifies the code and makes it more modular, allowing for easier customization and maintenance.

Secondly, it improves performance by recycling and reusing views, rather than creating new ones, resulting in smoother scrolling and reduced memory usage.

Another benefit of RecyclerView is its flexibility in layout management.

It provides various layout managers, such as LinearLayoutManager, GridLayoutManager, and StaggeredGridLayoutManager, allowing developers to create different types of list or grid layouts with ease.

Additionally, RecyclerView supports animations, making it easier to add attractive visual effects when items are added, removed, or updated.

This enhances the overall user experience and makes the app feel more dynamic.

In fact, RecyclerView is a powerful and essential component in Android development.

Its improved performance, flexibility, and support for animations make it a preferred choice over the older ListView.

Understanding and effectively utilizing RecyclerView is crucial for creating efficient and visually appealing Android applications.

Understanding RecyclerView Basics

RecyclerView is a powerful component in Android that helps in displaying large data sets efficiently.

It is an improved version of ListView and GridView, providing more flexibility and control over the presentation of data.

Explanation of RecyclerView components: LayoutManager, Adapter, and ViewHolder

The LayoutManager is responsible for measuring and positioning item views within the RecyclerView.

It determines the visual layout and arrangement of items.

There are three built-in LayoutManagers: LinearLayoutManager, GridLayoutManager, and StaggeredGridLayoutManager.

The Adapter is responsible for providing data to the RecyclerView, creating views for each item in the data set, and binding data to those views.

It acts as an intermediary between the data set and the RecyclerView.

The ViewHolder represents a single item view and holds references to its views.

It optimizes performance by only inflating the layout once and then recycling views instead of creating new ones for each item.

Step-by-step guide on setting up RecyclerView in an Android project

To use RecyclerView in your Android project, follow these steps:

1. Add the RecyclerView dependency to your app-level build.gradle file:

implementation 'androidx.recyclerview:recyclerview:1.2.1'

2. Define the RecyclerView in your layout XML file:

<androidx.recyclerview.widget.recyclerview
 android:id="@+id/recyclerView"
 android:layout_width="match_parent"
 android:layout_height="match_parent" />

3. Create a layout for your item view, which will be inflated by the Adapter:

<linearlayout
 ...>

4. Create a custom Adapter by extending the RecyclerView.Adapter class and implementing its methods.

5. In your activity or fragment, initialize the RecyclerView, set the LayoutManager, and attach the Adapter:

RecyclerView recyclerView = findViewById(R.id.recyclerView);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);

Overview of different types of LayoutManagers available and when to use each one

  1. LinearLayoutManager: This is the most common LayoutManager, which arranges items in a single scrollable list. It supports both vertical and horizontal scrolling.

  2. GridLayoutManager: This LayoutManager arranges items in a grid format with specified number of columns. It is suitable for displaying tabular data or a gallery-like layout.

  3. StaggeredGridLayoutManager: This LayoutManager is similar to GridLayoutManager but allows items to have variable sizes. It creates an interesting visual effect with staggered rows or columns.

Each LayoutManager has its own unique features, and choosing the right one depends on the specific requirements of your app’s UI design and data presentation.

In a nutshell, RecyclerView is a crucial component for efficiently displaying large data sets in Android apps.

By understanding its basics, components, and different types of LayoutManagers, you can effectively implement RecyclerView in your projects.

This provides a more optimized and customizable user experience, ensuring smooth scrolling and better memory management.

Utilizing RecyclerView Best Practices

Mastering RecyclerView in Android involves adhering to best practices that ensure optimal performance, smooth scrolling, and efficient data handling.

By implementing these techniques, you can create highly responsive and user-friendly applications.

Optimal Memory Management Techniques

Efficient memory management is crucial for smooth RecyclerView scrolling and overall performance.

To achieve this, consider the following techniques:

  • Use ViewHolder Pattern: The ViewHolder pattern reduces the number of calls to findViewById, improving performance.

  • Recycle Views: RecyclerView reuses item views that are no longer visible, minimizing memory usage.

  • Avoid Nested Layouts: Use simple and flat layouts to decrease layout inflation time.

  • Use DiffUtil: For large datasets, use DiffUtil to calculate differences and update the RecyclerView efficiently.

Proper memory management ensures that your app runs smoothly, even with extensive data.

Implementing View Recycling

View recycling is a fundamental concept in RecyclerView that significantly enhances performance by reusing item views.

Here’s how to implement view recycling effectively:

  • Create ViewHolder Class: Define a ViewHolder class to hold references to item views.

  • Override onCreateViewHolder: Inflate item layout and create a ViewHolder instance.

  • Override onBindViewHolder: Bind data to the item views efficiently.

  • Use getItemViewType: For multiple view types, override getItemViewType to return different layout resources.

Example of creating a ViewHolder and binding data:

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext())
                              .inflate(R.layout.item_layout, parent, false);
    return new MyViewHolder(view);
}

@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
    MyData data = dataList.get(position);
    holder.textView.setText(data.getText());
}

By implementing view recycling, you reduce memory usage and improve scrolling performance.

Properly Handling Item Clicks and Long Presses

Handling item clicks and long presses in RecyclerView enhances user interaction and functionality.

Follow these steps to manage clicks effectively:

  • Define Interface for Clicks: Create an interface to handle item clicks and long presses.

  • Set Click Listeners in ViewHolder: Implement click listeners within the ViewHolder class.

  • Pass Click Events to Activity/Fragment: Use the interface to communicate click events to the hosting activity or fragment.

Example of handling item clicks:

public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    private final TextView textView;
    private final ItemClickListener itemClickListener;

    public MyViewHolder(View itemView, ItemClickListener listener) {
        super(itemView);
        textView = itemView.findViewById(R.id.textView);
        itemClickListener = listener;
        itemView.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        itemClickListener.onItemClick(getAdapterPosition());
    }
}

public interface ItemClickListener {
    void onItemClick(int position);
}

Handling long presses follows a similar approach, using setOnLongClickListener:

itemView.setOnLongClickListener(new View.OnLongClickListener() {
    @Override
    public boolean onLongClick(View v) {
        itemClickListener.onItemLongPress(getAdapterPosition());
        return true;
    }
});

By properly managing item clicks and long presses, you enhance the interactivity and usability of your RecyclerView.

Utilizing best practices for RecyclerView in Android involves optimal memory management, efficient view recycling, and proper handling of item interactions.

Implementing these techniques ensures your app performs smoothly and provides a seamless user experience.

By focusing on these areas, you can master RecyclerView and create responsive, efficient applications.

Enhancing RecyclerView with Custom Layouts and Animations

Mastering RecyclerView in Android involves creating custom item layouts and implementing animations.

These enhancements improve user experience by making the interface more engaging and intuitive.

This section provides a step-by-step guide on creating custom item layouts and explores different animation options for RecyclerView.

We will also share tips for implementing smooth and visually appealing item transitions.

Creating Custom Item Layouts for RecyclerView

Custom item layouts allow you to display data in a way that best suits your app’s design and functionality.

Step-by-Step Guide:

  1. Define the Item Layout:


    • Create a new XML layout file for the RecyclerView item.


    • Customize the layout by adding views like TextView, ImageView, and Button.


    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView android:id="@+id/item_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="18sp" android:padding="8dp" />

    <ImageView android:id="@+id/item_image"
    android:layout_width="match_parent"
    android:layout_height="200dp"
    android:scaleType="centerCrop" />
    </LinearLayout>

  2. Create a ViewHolder Class:

    • Extend RecyclerView.ViewHolder and initialize views.


    public class CustomViewHolder extends RecyclerView.ViewHolder {
    TextView title;
    ImageView image;

    public CustomViewHolder(View itemView) {
    super(itemView);
    title = itemView.findViewById(R.id.item_title);
    image = itemView.findViewById(R.id.item_image);
    }
    }

  3. Modify the Adapter:

    • Override onCreateViewHolder, onBindViewHolder, and getItemCount methods.Inflate the custom layout in onCreateViewHolder.


    @Override
    public CustomViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext())
    .inflate(R.layout.custom_item_layout, parent, false);
    return new CustomViewHolder(view); }

    @Override
    public void onBindViewHolder(CustomViewHolder holder, int position) {
    // Bind data to the views
    holder.title.setText(dataList.get(position).getTitle());
    holder.image.setImageResource(dataList.get(position).getImageResId());
    }

    @Override
    public int getItemCount() {
    return dataList.size();
    }

Exploring Animation Options for RecyclerView

Animations enhance the user experience by making interactions smoother and more engaging.

Types of Animations:

  1. Item Animations:

    • Default Item Animations: Use RecyclerView.ItemAnimator to animate item additions, removals, and changes.


    • Custom Item Animations: Extend DefaultItemAnimator to create custom animations.


    RecyclerView.ItemAnimator animator = new DefaultItemAnimator();
    recyclerView.setItemAnimator(animator);

  2. Layout Animations:

    • Apply animations when RecyclerView items appear or disappear.


    • Use LayoutTransition for smooth layout changes.


    LayoutTransition layoutTransition = new LayoutTransition();
    recyclerView.getLayout().setLayoutTransition(layoutTransition);

  3. View Property Animations:

    • Use ObjectAnimator or ValueAnimator for complex animations.


    • Apply animations to individual view properties like alpha, scale, or rotation.


    ObjectAnimator animator = ObjectAnimator.ofFloat(view, "translationX", 0f, 100f);
    animator.setDuration(500); animator.start();

Tips for Smooth and Visually Appealing Transitions

Implementing smooth and appealing transitions can significantly enhance the user experience.

  1. Optimize Performance:

    • Avoid complex calculations in onBindViewHolder.

    • Use efficient data structures to manage data.

  2. Use Hardware Acceleration:

    • Enable hardware acceleration for smoother animations.


    • Ensure your animations are compatible with hardware acceleration.


    <application android:hardwareAccelerated="true"
    ...>

  3. Limit Animation Duration:

    • Keep animations short and responsive.

    • Aim for durations between 300 and 500 milliseconds.

  4. Test on Different Devices:

    • Ensure animations run smoothly on various screen sizes and hardware configurations.

    • Adjust properties as needed for consistency.

By following these best practices, you can create custom item layouts and implement engaging animations in RecyclerView, enhancing your Android app’s overall user experience.

Read: Integrating Google Maps in Your Android Application

Loading and Handling Data Efficiently in RecyclerView

Mastering RecyclerView in Android involves efficiently loading and handling data, especially when dealing with large datasets.

Proper techniques ensure smooth performance and an improved user experience.

Handling Large Datasets

Efficiently managing large datasets is crucial for maintaining RecyclerView performance.

When handling extensive data, consider the following strategies:

  • Efficient Data Loading: Load data in chunks instead of all at once.

  • Recycling Views: Reuse views to minimize memory usage.

  • DiffUtil: Use DiffUtil to optimize data updates without reloading the entire dataset.

These strategies reduce memory consumption and improve scrolling performance.

Implementing Lazy Loading and Pagination

Lazy loading and pagination are essential techniques for handling large datasets in RecyclerView.

They load data incrementally as the user scrolls, enhancing performance.

Lazy Loading:

Lazy loading delays data loading until it’s needed. Implement lazy loading by:

  • Monitoring Scroll Position: Detect when the user approaches the end of the list.

  • Loading Additional Data: Fetch more data when the user scrolls close to the end.
Example Implementation:
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);
        if (!recyclerView.canScrollVertically(1)) {
            loadMoreData();
        }
    }
});

private void loadMoreData() {
    // Fetch and append data to the existing list
}

Pagination:

Pagination divides data into discrete pages, loading one page at a time. Implement pagination by:

  • Setting Up a Page Loader: Fetch data in pages rather than all at once.

  • Appending Data: Append new pages to the existing dataset as the user scrolls.
Example Implementation:
private int currentPage = 1;
private boolean isLoading = false;

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);
        if (!recyclerView.canScrollVertically(1) && !isLoading) {
            loadNextPage();
        }
    }
});

private void loadNextPage() {
    isLoading = true;
    // Fetch next page data
    currentPage++;
    isLoading = false;
}

Caching Data

Caching data minimizes network requests, improving performance and user experience. Implement caching by:

  • Storing Data Locally: Use SQLite, Room, or SharedPreferences for local storage.

  • Retrieving Cached Data: Load data from the cache before making network requests.

Example Implementation Using Room:

@Dao
public interface DataDao {
    @Query("SELECT * FROM data")
    LiveData<List<Data>> getAllData();

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    void insertAll(List<Data> data);
}

public class Repository {
    private DataDao dataDao;

    public Repository(Application application) {
        AppDatabase db = AppDatabase.getDatabase(application);
        dataDao = db.dataDao();
    }

    public LiveData<List<Data>> getAllData() {
        return dataDao.getAllData();
    }

    public void insertAll(List<Data> data) {
        AppDatabase.databaseWriteExecutor.execute(() -> dataDao.insertAll(data));
    }
}

Improving User Experience

Efficient data handling directly enhances user experience.

By implementing lazy loading, pagination, and caching, you ensure:

  • Smooth Scrolling: Users experience less lag and smoother navigation.

  • Faster Load Times: Data loads incrementally, reducing initial load times.

  • Reduced Network Usage: Cached data minimizes unnecessary network requests.

Mastering data handling in RecyclerView involves efficient loading, lazy loading, pagination, and caching.

These techniques enhance performance and user experience, ensuring smooth and responsive applications.

By implementing these best practices, you can effectively manage large datasets and provide a seamless user experience in your Android applications.

Read: Deploying Unity Games on Android: A Simple Guide

Enhancing User Experience with RecyclerView

RecyclerView is a powerful tool in Android development, enabling efficient display and management of large datasets.

To master RecyclerView, you must focus on enhancing user experience through interactive and responsive item interactions, search functionality, and dynamic data handling.

Creating Interactive and Responsive Item Interactions

To improve user interaction with RecyclerView, implement swipe actions and drag-and-drop functionality.

These features make the app more intuitive and user-friendly.

Swipe Actions:

  • Delete Items: Allow users to swipe left or right to delete items.

  • Archive Items: Enable swiping to archive items for future reference.

Implement swipe actions using ItemTouchHelper.SimpleCallback.

This class provides methods to detect swipe gestures and perform actions accordingly.

ItemTouchHelper.SimpleCallback simpleCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
    @Override
    public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
        int position = viewHolder.getAdapterPosition();
        // Handle swipe actions here
    }
};
new ItemTouchHelper(simpleCallback).attachToRecyclerView(recyclerView);

Drag-and-Drop:

  • Reorder Items: Allow users to drag and drop items to reorder them.

  • Move Between Sections: Enable dragging items between different sections or categories.

Use ItemTouchHelper to add drag-and-drop functionality.

This helps create a dynamic and engaging user experience.

ItemTouchHelper.SimpleCallback simpleCallback = new ItemTouchHelper.SimpleCallback(ItemTouchHelper.UP | ItemTouchHelper.DOWN, 0) {
    @Override
    public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
        int fromPosition = viewHolder.getAdapterPosition();
        int toPosition = target.getAdapterPosition();
        // Handle move actions here
        return true;
    }
};
new ItemTouchHelper(simpleCallback).attachToRecyclerView(recyclerView);

Implementing Search Functionality in RecyclerView

Adding search functionality enhances the user experience by allowing users to find specific items quickly.

Implement search functionality using a SearchView or EditText to filter items in RecyclerView.

Steps to Implement Search:

  • Add Search Widget: Include a SearchView or EditText in the layout.

  • Filter Logic: Implement a filter method in the RecyclerView adapter.

  • Update Data: Update the RecyclerView with filtered data.
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
    @Override
    public boolean onQueryTextSubmit(String query) {
        return false;
    }

    @Override
    public boolean onQueryTextChange(String newText) {
        adapter.getFilter().filter(newText);
        return false;
    }
});

Handling Dynamic Data Updates and Maintaining Consistency

Properly managing dynamic data updates ensures RecyclerView remains consistent and responsive.

Here are tips for handling dynamic data:

Use DiffUtil:

  • Efficient Updates: Use DiffUtil to calculate the differences between old and new lists, ensuring efficient updates.

  • Maintain Consistency: DiffUtil handles item changes, additions, and deletions, maintaining consistency.
DiffUtil.Callback diffCallback = new DiffUtil.Callback() {
    // Implement methods to compare old and new list items
};
DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(diffCallback);
adapter.setData(newDataList);
diffResult.dispatchUpdatesTo(adapter);

Avoid Full Reloads:

  • Partial Updates: Update only the affected items instead of reloading the entire dataset.

  • Notify Changes: Use notifyItemChanged(), notifyItemInserted(), and notifyItemRemoved() for partial updates.
adapter.notifyItemChanged(position);
adapter.notifyItemInserted(position);
adapter.notifyItemRemoved(position);

Handle Configuration Changes:

  • Save State: Save RecyclerView state during configuration changes like screen rotations.

  • Restore State: Restore RecyclerView state to maintain user context.
// Save state
Parcelable recyclerViewState = recyclerView.getLayoutManager().onSaveInstanceState();
// Restore state
recyclerView.getLayoutManager().onRestoreInstanceState(recyclerViewState);

Mastering RecyclerView in Android involves creating interactive item interactions, implementing search functionality, and efficiently handling dynamic data updates.

By focusing on these best practices, you can significantly enhance the user experience, making your app more responsive, intuitive, and user-friendly.

Read: Is Learning Kotlin Worth It for Android Development?

Mastering RecyclerView in Android: Best Practices

Testing and Debugging RecyclerView

Mastering RecyclerView in Android development involves thorough testing and efficient debugging.

Ensuring that your RecyclerView works correctly can enhance user experience and app performance.

Here’s how to effectively test and debug your RecyclerView components.

Unit Testing Strategies for RecyclerView Components

Unit testing is crucial for verifying the functionality of RecyclerView components.

Here are some effective strategies:

  1. Test Data Binding: Ensure that data binds correctly to the ViewHolder. Use mock data to verify the accuracy of displayed information.
   @Test
   public void testBindViewHolder() {
       // Arrange
       MyViewHolder viewHolder = new MyViewHolder(mockView);
       MyData data = new MyData("Test Title", "Test Description");

       // Act
       viewHolder.bind(data);

       // Assert
       assertEquals(viewHolder.titleTextView.getText(), "Test Title");
       assertEquals(viewHolder.descriptionTextView.getText(), "Test Description");
   }
  1. Test Adapter Methods: Validate methods in your adapter, such as getItemCount(), onCreateViewHolder(), and onBindViewHolder().
   @Test
   public void testGetItemCount() {
       List<MyData> dataList = Arrays.asList(new MyData(), new MyData());
       MyAdapter adapter = new MyAdapter(dataList);

       assertEquals(adapter.getItemCount(), 2);
   }
  1. Test Item Clicks: Verify that item click actions perform the expected operations. Use mock click listeners to test interactions.
   @Test
   public void testItemClick() {
       MyAdapter adapter = new MyAdapter(mockDataList);
       MyViewHolder viewHolder = adapter.onCreateViewHolder(mockParent, 0);
       adapter.onBindViewHolder(viewHolder, 0);

       viewHolder.itemView.performClick();

       verify(mockClickListener).onItemClick(mockDataList.get(0));
   }

Debugging Common Issues

Debugging is an essential part of ensuring your RecyclerView works seamlessly.

Here are some common issues and how to address them:

  1. Incorrect Item Rendering: If items render incorrectly, check your onBindViewHolder() method. Ensure data binds correctly and view properties reset as needed.
   @Override
   public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
       MyData data = dataList.get(position);
       holder.titleTextView.setText(data.getTitle());
       holder.descriptionTextView.setText(data.getDescription());
   }
  1. Data Inconsistency: Data inconsistency can arise from improper data handling or adapter updates. Use DiffUtil to manage changes efficiently.
   DiffUtil.Callback diffCallback = new MyDiffCallback(oldList, newList);
   DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(diffCallback);

   dataList.clear();
   dataList.addAll(newList);
   diffResult.dispatchUpdatesTo(this);
  1. Layout Issues: Ensure your RecyclerView and its items have the correct layout parameters. Misconfigured layouts can cause unexpected behaviors.
   <androidx.recyclerview.widget.RecyclerView
       android:id="@+id/recyclerView"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:layoutManager="LinearLayoutManager" />

Utilizing Tools for Efficient Debugging

Several tools can streamline the debugging process for RecyclerView components:

  1. RecyclerView Inspector: This tool in Android Studio helps visualize RecyclerView hierarchies, inspect item properties, and debug rendering issues.

    • How to Use: Open your app in Android Studio, navigate to View -> Tool Windows -> Layout Inspector, and select RecyclerView Inspector.

  2. Logcat: Use Logcat to log data binding processes, click events, and adapter updates.
   Log.d("RecyclerView", "Item bound at position: " + position);
  1. Stetho: Facebook’s Stetho provides a bridge to Chrome Developer Tools, allowing you to inspect databases, view hierarchies, and network operations.

    • How to Use: Integrate Stetho into your app, then connect it to Chrome Developer Tools for in-depth inspection.

Effective testing and debugging are vital for mastering RecyclerView in Android development.

Utilize unit testing strategies to ensure each component works correctly.

Address common issues like incorrect item rendering and data inconsistency with proper debugging techniques.

Leverage tools like RecyclerView Inspector and Logcat for efficient troubleshooting.

By following these practices, you can enhance the performance and reliability of your RecyclerView implementations.

Read: Java and Android: A Comprehensive Guide to Mobile Dev

Conclusion

We delved into the best practices of mastering RecyclerView in Android.

We covered important points such as item view recycling, view holders, and data binding techniques.

To recap, RecyclerView offers a more flexible and efficient way to display data in lists and grids.

It improves performance by only creating and binding views when necessary.

Additionally, using view holders and data binding reduces overhead and enhances scrolling smoothness.

Now that you have a better understanding of RecyclerView, it’s time to explore and master it in your Android projects.

Experiment with different layouts, animations, and interactions to create a seamless user experience.

To further enhance your skills, there are plenty of additional resources and tutorials available.

Online platforms like Android Developer Documentation, tutorials on YouTube, and community forums provide a wealth of information.

Take advantage of these resources to polish your RecyclerView knowledge and become an expert.

Remember, RecyclerView is a powerful tool that can greatly enhance the UI and performance of your Android apps.

So don’t hesitate, dive in, and start creating amazing user interfaces with RecyclerView!

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