highlight items in recyclerview android - android-recyclerview

Question

I am trying to select items in recylerview. When I click an item, a checkbox appears on that item and it is highlighted. But the problem is that when I scroll, the item which is highlighted goes to its original color but the checkbox image remains as it should. Why the highlighted color is gone but the image remains after scrolling, I want the items to keep their state after scrolling.
public static List<Model> item = new ArrayList<Model>()
#Override
public void onBindViewHolder(#NonNull MyAdapter.MyViewHolder holder, int
position) {
holder.bind(item.get(position));
//
public class MyViewHolder extends RecyclerView.ViewHolder{
public MyViewHolder(#NonNull View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.check);
public void bind(Model model) {
if (model.isChecked()){
imageView.setVisibility(View.VISIBLE);
itemView.setBackgroundColor(Color.GRAY);
model.setChecked(true);
} else {
imageView.setVisibility(View.GONE);
itemView.setBackgroundColor(Color.TRANSPARENT);
model.setChecked(false);
}
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Model s = item.get(getAdapterPosition());
if (!selectList.contains(s)){
selectList.add(s);
model.setChecked(true);
} else {
selectList.remove(s);
model.setChecked(false);
}
notifyItemChanged(getAdapterPosition());
}
});
public class Model {
private boolean isChecked = false;
public boolean isChecked() {
return isChecked;
}
public void setChecked(boolean checked) {
isChecked = checked;
}
}

Answer 1

Don't manually change the design in the onclick listener, just update your model (as you are already doing: model.setchecked(...) depending on state)
Then call Adapter.notifyItemChanged(getAdapterPosition())
This will force the adapter to reload the item, calling onBindViewHolder, where the design should be updated properly
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Model s = item.get(getAdapterPosition());
if (!selectList.contains(s)){
selectList.add(s);
model.setChecked(true);
} else {
selectList.remove(s);
model.setChecked(false);
}
adapter.notifyItemChanged(getAdapterPosition())
}
In the above example, replace "adapter" with a reference to your recylerview adapter