Question

我正在处理使用排球获取数据并使用RecyclerView在Feed中显示的应用。我在每张卡片中都有一个Button，点击后会计算点击次数并将其显示在{/ 1}}在该特定卡片中**（如Instagram按钮）**。当我运行它时，应用程序崩溃了。我究竟做错了什么？

这是我的代码

TextView

Answer 1

package net.simplifiedcoding.myfeed;
import android.content.Context;
import android.media.Image;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ProgressBar;
import android.widget.TextView;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.NetworkImageView;
import org.w3c.dom.Text;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by Belal on 11/9/2015.
 */
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> {
    //Imageloader to load image
    private ImageLoader imageLoader;
    private Context context;

    //List to store all superheroes
    List<SuperHero> superHeroes;

    //Constructor of this class
    public CardAdapter(List<SuperHero> superHeroes, Context context) {
        super();
        //Getting all superheroes
        this.superHeroes = superHeroes;
        this.context = context;
    }

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

    @Override
    public void onBindViewHolder( final ViewHolder holder,    final int position) {
        //Getting the particular item from the list
          SuperHero superHero = superHeroes.get(position);

        //Loading image from url
        imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
        imageLoader.get(superHero.getImageUrl(), ImageLoader.getImageListener(holder.imageView, R.drawable.image, android.R.drawable.ic_dialog_alert));

        //Showing data on the views
        holder.imageView.setImageUrl(superHero.getImageUrl(), imageLoader);
        holder.textViewName.setText(superHero.getName());
        holder.textViewPublisher.setText(superHero.getPublisher());
        holder.textViewLikes.setText(superHero.getLikes());



        holder.custom_button.setOnClickListener(new PlusListener(position,superHero,holder.txtCount));
        holder.txtCount.setText(superHeroes.get(position).getCount());


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

    class ViewHolder extends RecyclerView.ViewHolder {
        //Views
        public NetworkImageView imageView;
        public TextView textViewName;
        public TextView textViewPublisher;
        public TextView textViewLikes;
        public TextView txtCount;
        public ImageButton custom_button;

        //Initializing Views
        public ViewHolder(View itemView) {
            super(itemView);
            imageView = (NetworkImageView) itemView.findViewById(R.id.imageViewHero);
            textViewName = (TextView) itemView.findViewById(R.id.textViewName);
            textViewPublisher = (TextView) itemView.findViewById(R.id.textViewPublisher);
            textViewLikes = (TextView) itemView.findViewById(R.id.textViewlikes);
            txtCount = (TextView) itemView.findViewById(R.id.txtCount);
            custom_button = (ImageButton) itemView.findViewById(R.id.custom_button);
        }
    }
}


 class PlusListener implements View.OnClickListener
    {
    SuperHero Data;
    int position;
    TextView txtCount;
    Listener(int position,SuperHero Data,TextView txtCount)
    {
    this.Data = Data;
    this.position = position;
    this.txtCount= txtCount
    }
     @Override
            public void onClick(View view) {

      int count  = data.getCount();

            count = count+1;
            data.setCount(count);
                txtCount.setText(""+count);

            }
    }


class MinusListener implements View.OnClickListener
    {
    SuperHero Data;
    int position;
    TextView txtCount;
    Listener(int position,SuperHero Data,TextView txtCount)
    {
    this.Data = Data;
    this.position = position;
        this.txtCount= txtCount
    }
     @Override
            public void onClick(View view) {

            int count  = data.getCount();
if(count>0)
{
            count = count-1;
            data.setCount(count);
                txtCount.setText(""+count);
} 

 }
    }


public class SuperHero {

    //Data Variables
    private String imageUrl;
    private String name;
    private String publisher;
    private String likes;
    private int count;


    //Getters and Setters

    public String getImageUrl() {
        return imageUrl;
    }

    public void setImageUrl(String imageUrl) {
        this.imageUrl = imageUrl;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPublisher() {
        return publisher;
    }

    public void setPublisher(String publisher) {
        this.publisher = publisher;
    }

    public String getLikes() {
        return likes;
    }

    public void setLikes(String likes) {
        this.likes = likes;
    }

    public int getCount() {
        return count ;
    }

    public void setCount(int count) {
        this.count = count;
    }




}

Answer 2

只是简单地这样做

替换此行

holder.txtCount.setText(superHeroes.get(position).getCount());

用这个

holder.txtCount.setText(String.valueOf(superHeroes.get(position).getCount()));

你的应用程序崩溃了，因为textView从不设置Integer值。

在recyclerview中点击按钮增加计数器

2 个答案: