RecyclerView项目重复并不断变化

Question

发生了什么:

列表(RecyclerView)在滚动时混合数据.

IE向下滚动后向上滚动,一些列表项重复,不显示正确的内容.

package jamesnguyen.newzyv2.UI_update;

import android.content.Context;
import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.List;

import jamesnguyen.newzyv2.R;
import jamesnguyen.newzyv2.RSS_Processcors.RssItem;

public class RVAdapter extends RecyclerView.Adapter<RVAdapter.FeedViewHolder> {

    private static List<RssItem> items = null;
    private static Context context;

    public RVAdapter(Context context, List<RssItem> items) {
        this.items = items;
        this.context = context;
    }

    public static List<RssItem> getItems() {
        return items;
    }

    @Override
    public RVAdapter.FeedViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, viewGroup, false);
        return new FeedViewHolder(v);
    }

    @Override
    public void onBindViewHolder(RVAdapter.FeedViewHolder holder, int position) {
        FeedViewHolder.getTitle().setText(items.get(position).getTitle());
        FeedViewHolder.getPubDate().setText(items.get(position).getPubDate());
        //FeedViewHolder.getDescription().setText(items.get(position).getDescription());
    }

    @Override
    public long getItemId(int id) {
        return id;
    }

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

    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);
    }

    public static class FeedViewHolder extends RecyclerView.ViewHolder {
        private static CardView cv;
        private static TextView title;
        private static TextView pubDate;
        private static TextView description;

        FeedViewHolder(View itemView) {
            super(itemView);
            cv = (CardView) itemView.findViewById(R.id.cv);
            title = (TextView) itemView.findViewById(R.id.title);
            pubDate = (TextView) itemView.findViewById(R.id.pubDate);
            //description = (TextView) itemView.findViewById(R.id.description);
        }

        public static TextView getTitle() {
            return title;
        }

        public static TextView getPubDate() {
            return pubDate;
        }

        public static TextView getDescription() {
            return description;
        }
    }
}

我相信也许有些工作必须通过RecyclerView的回收过程完成,但我试过看起来没什么用.

Answer 1

完成了.

@Override
public long getItemId(int position) {
    return position;
}

@Override
public int getItemViewType(int position) {
   return position;
}

Answer 2

您的RecyclerView适配器中只有两件事

 @Override
public long getItemId(int position) {
    return position;
}

并在适配器的构造函数中

 setHasStableIds(true);

希望能帮助到你!

Answer 3

问题是CardView和TextView对象在内部声明为静态FeedViewHolder.这意味着尝试在onBindViewHolder方法中设置标题的所有调用都会触及最新的膨胀视图.

解决方法是删除static从cv,title,pubDate,description,然后执行一些非静态的制定者,如:

public void setTitle(String s) {
    title.setText(s);
}

要在onBindViewHolder方法中调用:

@Override
public void onBindViewHolder(RVAdapter.FeedViewHolder holder, int position) {
    holder.setTitle(items.get(position).getTitle());
    //...
}

Answer 4

我遇到了一个大网格recyclerview的相同问题，该视图具有按顺序应该出现的数百个数字，但是它们的顺序变得混乱并重复。

// More concise code with Kotlin expressions
override fun getItemId(position: Int) = position.toLong()
override fun getItemViewType(position: Int) = position

将以上行添加到适配器。