RatingBar and RecyclerView

Question

I am trying to make an application that rates 8 different types of foods with simple rater and recyclerview. Pressing the FAB button just adds a random food with 0 rating. I have gotten most of it to work except the rating of the rating bar. When I scroll up or down, I lose the ratings I had. How can I store the ratings of food when I scroll up or down.

RecyclerView:

package com.mycompany.alawamhm.foodrater;

import android.content.Context;
import android.graphics.Movie;
import android.icu.text.AlphabeticIndex;
import android.support.v7.widget.RecyclerView;
import android.text.Layout;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RatingBar;
import android.widget.TextView;

import com.iarcuschin.simpleratingbar.SimpleRatingBar;

import org.w3c.dom.Text;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Random;
import javax.xml.transform.sax.SAXSource;


public class FoodAdapter extends RecyclerView.Adapter<FoodAdapter.ViewHolder>{

private Random mRandom = new Random();
private RecyclerView mRecyclerView;
final HashMap<String,Integer> defaultName;
final ArrayList<String> mNames=new ArrayList<>();

public FoodAdapter(RecyclerView rv){
    defaultName = new HashMap<>();
    defaultName.put("banana", R.drawable.banana);
    defaultName.put("broccoli", R.drawable.broccoli);
    defaultName.put("homemade bread", R.drawable.bread);
    defaultName.put("chicken", R.drawable.chicken);
    defaultName.put("chocolate", R.drawable.chocolate);
    defaultName.put("ice cream", R.drawable.icecream);
    defaultName.put("lima beans", R.drawable.limabeans);
    defaultName.put("steak", R.drawable.steak);
    for(String name : defaultName.keySet()){
        mNames.add(name);
    }
    mRecyclerView = rv;

}

public String getRandomName(){
    String[] names = new String[]{
            "banana","broccoli","homemade bread","chicken",
            "chocolate","ice cream","lima beans","steak"
    };
    return names[mRandom.nextInt(names.length)];
}

public void addName(){
    mNames.add(0,getRandomName());
    notifyItemInserted(0);
    mRecyclerView.getLayoutManager().scrollToPosition(0);
}

@Override
public FoodAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.name_view,parent,false);
    return new ViewHolder(view);
}


@Override
public void onBindViewHolder(ViewHolder holder, int position) {
    String name = mNames.get(position);
    holder.mNameTextView.setText(name);
    holder.mImage.setImageResource(defaultName.get(name));
    holder.rBar.setRating(0);
}

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


public void removeName(int position){
    mNames.remove(position);
    notifyItemRemoved(position);
}


class ViewHolder extends RecyclerView.ViewHolder{

    private TextView mNameTextView;
    private ImageView mImage;
    SimpleRatingBar rBar;

    public ViewHolder(View itemView) {
        super(itemView);
        mNameTextView = (TextView)itemView.findViewById(R.id.name_view);
        mImage = (ImageView)itemView.findViewById(R.id.imageView);
        rBar = (SimpleRatingBar)itemView.findViewById(R.id.ratingBar);
    }
}

}

Answer 1

Currently the ratings bar is being set to 0 every time a view is bound to a view holder. Set a listener on the rating bar that runs a method to store the new rating value in a hashSet. Then in the adapter, instead of setting the rating bar to 0, add a helper method that iterates through the hashMap to check if a value has been stored for the food being inflated. This method should return the stored value or 0 if the food hasn't stored a value yet.