RatingBar 和 RecyclerView

Question

我正在尝试制作一个应用程序，使用简单的评分器和回收器视图对 8 种不同类型的食物进行评分。按下 FAB 按钮只会添加一个评级为 0 的随机食物。除了评级栏的评级，我已经得到了大部分的工作。当我向上或向下滚动时，我失去了我的评级。如何在向上或向下滚动时存储食物的评分。

回收站视图：

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

目前，每次将视图绑定到视图持有者时，评级栏都会设置为 0。在评分栏上设置一个侦听器，该侦听器运行一种方法以将新的评分值存储在 hashSet 中。然后在适配器中，不要将评级栏设置为 0，而是添加一个辅助方法，该方法遍历 hashMap 以检查是否已为正在充气的食物存储值。此方法应 return 存储值，如果食物尚未存储值，则应为 0。

RatingBar 和 RecyclerView

RatingBar and RecyclerView

android

android-recyclerview

ratingbar