[Solved] how to show and hide imageview inside recyclerView

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You need just add field in your adapter where you will save currently active item. Then call notifyDataSetChanged.
Also you should update your onBindViewHolder like this:

private int currentPosition = -1;

@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
    holder.textView.setText(items.get(position));
    if (currentPosition == position) {
        holder.img1.setVisibility(View.INVISIBLE);
        holder.img2.setVisibility(View.VISIBLE);
    } else {
        holder.img1.setVisibility(View.VISIBLE);
        holder.img2.setVisibility(View.INVISIBLE);
    }
}

public void setCurrentPosition(int currentPosition) {
    this.currentPosition = currentPosition;
}

I’ve created a test project to show how it can be implemented. Here you can see how it works. Here is my github repository.

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solved how to show and hide imageview inside recyclerView