Wallpaper App in Android using MVVM – Part 4: RecyclerView & Paging Lib | Android Studio Tutorial

In this tutorial, we take a major step forward by displaying wallpapers using RecyclerView and integrating the Paging 3 Library for efficient, smooth, and on-demand loading of images from the Pexels API. You'll learn how to structure paging sources, create adapters, and dynamically load data based on selected categories.

✅ What you'll learn in this video:
👉 Setup Paging 3 and Glide libraries
👉 Create and use PexelsPagingSource for loading paginated API data
👉 Connect repository and ViewModel for wallpaper data
👉 Build a custom WallpapersAdapter using PagingDataAdapter
👉 Update UI with RecyclerView and ProgressBar
👉 Use addLoadStateListener for better UX
👉 Handle category selection with ChipGroup

📂 Steps Covered:
2️⃣ Create PexelsPagingSource and override necessary paging methods
3️⃣ Connect getWallpapers to PexelsRepository
4️⃣ Setup WallpapersViewModel with dynamic search query
6️⃣ Build WallpapersAdapter extending PagingDataAdapter
7️⃣ Setup RecyclerView in WallpapersFragment
8️⃣ Observe paginated data and bind it to UI
9️⃣ Enable category switching with ChipGroup
🔟 Add loading indicator using addLoadStateListener
🔁 Run and test for smooth infinite scrolling

🧰 Tools & Concepts Used:
🔧 Android Studio
🔧 MVVM Architecture
🔧 RecyclerView + Paging 3
🔧 Glide (Image Loading)
🔧 Kotlin Coroutines
🔧 ViewBinding
🔧 ChipGroup interaction
🔧 UI Feedback (ProgressBar, loading states)

🚀 By the end of this tutorial, you’ll have:
✔️ A paginated list of wallpapers from the Pexels API
✔️ Responsive UI with loading states
✔️ Category filtering logic in place
✔️ A clean and reusable adapter setup

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