Glide

How to handle pagination in Glide?

Discover how to handle pagination in Glide apps effortlessly! Explore everything from simple setups to advanced tricks, guaranteeing smooth browsing and an enhanced user experience.

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Overview

Dealing with pagination in Glide means finding smart ways to load and show big sets of data little by little. Very important for keeping things running smoothly and giving users a better experience with those long item lists. Things to think about: lazy loading strategies, keeping track of data state, and making sure page switches are smooth. Knowing different Glide APIs and techniques for pagination helps in creating apps that are more responsive and easier to use. Dive into details on how to set up, tweak, and get the best out of pagination in Glide for projects.

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How to handle pagination in Glide?

Step 1: Add Glide dependency to your project

First things first, let's add Glide to your build.gradle file:

dependencies {
    implementation 'com.github.bumptech.glide:glide:4.12.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.12.0'
}

Step 2: Create a RecyclerView and Adapter

Next up, create a RecyclerView in your layout file. It's like setting up a canvas for your images:

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="16dp"/>

Now, let's whip up an Adapter class for your RecyclerView. This is where the magic happens with Glide loading your images:

public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ImageViewHolder> {
    private List<String> imageUrls;

    public ImageAdapter(List<String> imageUrls) {
        this.imageUrls = imageUrls;
    }

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

    @Override
    public void onBindViewHolder(ImageViewHolder holder, int position) {
        Glide.with(holder.itemView.getContext())
            .load(imageUrls.get(position))
            .into(holder.imageView);
    }

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

    static class ImageViewHolder extends RecyclerView.ViewHolder {
        ImageView imageView;

        ImageViewHolder(View itemView) {
            super(itemView);
            imageView = itemView.findViewById(R.id.imageView);
        }
    }
}

Step 3: Setup your RecyclerView in Activity or Fragment

In your Activity or Fragment, let's get that RecyclerView up and running:

RecyclerView recyclerView = findViewById(R.id.recyclerView);
ImageAdapter adapter = new ImageAdapter(new ArrayList<>());
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));

Step 4: Implement Pagination

To make things more interesting, let's add pagination. This way, more images load as you scroll:

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);

        LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
        if (layoutManager != null && layoutManager.findLastCompletelyVisibleItemPosition() == adapter.getItemCount() - 1) {
            // Fetch more data here
        }
    }
});

Step 5: Fetch and Append More Data

When it's time to fetch more data, make sure to add it to your existing list and notify the adapter:

private void fetchMoreData() {
    // Fetch your data here and then append it to imageUrls
    List<String> newData = fetchDataFromServer();
    imageUrls.addAll(newData);
    adapter.notifyItemRangeInserted(imageUrls.size() - newData.size(), newData.size());
}

Step 6: Update Your Adapter

Make sure your adapter can handle new data:

public void updateData(List<String> newImageUrls) {
    int positionStart = imageUrls.size();
    imageUrls.addAll(newImageUrls);
    notifyItemRangeInserted(positionStart, newImageUrls.size());
}

Step 7: Integrate Fetching Logic with Pagination

Finally, tie everything together by integrating the fetchMoreData method into the scroll listener:

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);

        LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
        if (layoutManager != null && layoutManager.findLastCompletelyVisibleItemPosition() == adapter.getItemCount() - 1) {
            fetchMoreData();
        }
    }
});

And there you have it! This guide should help you get pagination up and running with Glide in your Android app. Don't forget to handle network errors and loading indicators to keep things smooth for your users. Happy coding!

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