How to Add Headers and Footers to a RecyclerView in Android 5.0?

Adding Header and Footer to a RecyclerView in Android 5.0

The RecyclerView in Android 5.0 provides a convenient way to display a list of items. However, adding headers and footers to the list can be a bit tricky. Here's how you can achieve this:

Adding a Header:

1. Create a new layout file (e.g., header_layout.xml) for your header.
2. Inflate the header layout in theonCreate() method of your RecyclerView adapter:

LayoutInflater inflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
headerPlaceHolder = inflater.inflate(R.layout.header_layout, null, false);

3. Add the header view to the LayoutManager using the addView() method:

layouManager.addView(headerPlaceHolder, 0);

Adding a Footer:

1. Create a new layout file (e.g., footer_layout.xml) for your footer.
2. Inflate the footer layout in the onCreate() method of your RecyclerView adapter:

LayoutInflater inflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
footerPlaceHolder = inflater.inflate(R.layout.footer_layout, null, false);

3. Add the footer view to the LayoutManager using the addView() method:

layouManager.addView(footerPlaceHolder);

Considerations for Different LayoutManagers:

• LinearLayoutManager: The addView() method will insert the header or footer view at the specified position in the layout.
• GridLayoutManager: You need to create a new SpanSizeLookup class and set it on the GridLayoutManager to control the number of spans occupied by the header or footer view.

GridLayoutManager.SpanSizeLookup spanSizeLookup = new GridLayoutManager.SpanSizeLookup() {
    @Override
    public int getSpanSize(int position) {
        if (position == 0 || position == data.size()) {
            return gridLayoutManager.getSpanCount();
        } else {
            return 1;
        }
    }
};
gridLayoutManager.setSpanSizeLookup(spanSizeLookup);

Note:

• The getItemCount() method of your RecyclerView adapter should return the count of data items plus the number of added headers and footers.
• The getItemViewType() method should return a unique ID for the header, footer, and regular data items.

By following these steps, you can easily add headers and footers to your RecyclerView in Android 5.0 and above.

The above is the detailed content of How to Add Headers and Footers to a RecyclerView in Android 5.0?. For more information, please follow other related articles on the PHP Chinese website!