Performance tips for Adapters in Android?

When developing Android applications, especially those utilizing Adapters such as RecyclerView or ListView, performance is crucial. Here are some tips to enhance your adapter's performance:

1. Use ViewHolder Pattern: This minimizes calls to findViewById by caching the views within a ViewHolder object.
2. Recycling Views: Utilize the recycling mechanism of RecyclerView to keep scrolling smooth and efficient.
3. Set Fixed Size for List: If the content size will not change, set the layout size to fixed to optimize performance.
4. Limit onBindViewHolder Work: Move heavy computations outside of onBindViewHolder to prevent jank during scrolling.
5. Avoid Nested Views: Keep your layouts flat to improve layout rendering time.

Here's a basic example of how to implement a ViewHolder in a RecyclerView adapter:

class MyAdapter extends RecyclerView.Adapter {
    private List dataList;

    public static class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView textView;

        public MyViewHolder(View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.text_view);
        }
    }

    public MyAdapter(List data) {
        this.dataList = data;
    }

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

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

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