Optimizations of RecyclerView Performance

1.Set setHasFixedSize attribute when the recycler view item does not change the sizes of its children at runtime.

    recyclerView.setHasFixedSize(true)

1	recyclerView.setHasFixedSize(true)

2. When data gets changed, try to update only the affected items. When adding more items, just use:

adapter.notifyItemRangeInserted(rangeStart, rangeEnd);
adapter.notifyItemRemoved(position);
adapter.notifyItemChanged(position);
adapter.notifyItemInserted(position);

adapter.notifyItemRangeInserted(rangeStart, rangeEnd);

adapter.notifyItemRemoved(position);

adapter.notifyItemChanged(position);

adapter.notifyItemInserted(position);

notifyDataSetChanged(), RecyclerView.Adapter didn’t assign the same ViewHolder to the original item in the data set. In case of notifyDataSetChanged(), call setHasStableIds(true) on your adapter and override getItemId(int position) to return a unique Id that would represent each Data Item, simply return.So

@Override
public long getItemId(int position) {
  return itemList.get(position).getId(); 
   //or listData.get(position).hashCode().toLong() 
}

@Override

public long getItemId(int position) {

return itemList.get(position).getId();

//or listData.get(position).hashCode().toLong()

}

3. For RecyclerView with Nested RecyclerViews, setRecycledViewPool allows multiple RecyclerViews to share a common pool of scrap views. This can be useful if you have multiple RecyclerViews with adapters that use the same view type.

class OuterAdapter extends RecyclerView.Adapter<OuterAdapter.ViewHolder> {
    RecyclerView.RecycledViewPool sharedPool = new RecyclerView.RecycledViewPool();
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        // inflate inner item, find innerRecyclerView by ID…
        LinearLayoutManager innerLLM = 
        new LinearLayoutManager(parent.getContext(), LinearLayoutManager.HORIZONTAL,false);

        innerRv.setLayoutManager(innerLLM);
        innerRv.setRecycledViewPool(sharedPool);
        return new OuterAdapter.ViewHolder(innerRv);

    }
}

class OuterAdapter extends RecyclerView.Adapter<OuterAdapter.ViewHolder> {

RecyclerView.RecycledViewPool sharedPool = new RecyclerView.RecycledViewPool();

@Override

public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

// inflate inner item, find innerRecyclerView by ID…

LinearLayoutManager innerLLM =

new LinearLayoutManager(parent.getContext(), LinearLayoutManager.HORIZONTAL,false);

innerRv.setLayoutManager(innerLLM);

innerRv.setRecycledViewPool(sharedPool);

return new OuterAdapter.ViewHolder(innerRv);

}

4. RecyclerView Create taking too long

If your view taking a too long time to inflate, look at reducing the cost of your inflation. Reducing unnecessary container and structural Views can help – consider building itemViews with ConstraintLayout, which can make it easy to reduce structural Views

recyclerview RecyclerView Optimization

yogendra singh 31 July 2019

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Optimizations of RecyclerView Performance

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