android - RecyclerView 适配器问题

Question

这张图解释了我的问题

enter image description here

我有一个回收站 View 适配器的小问题，我有两个按钮向上投票和向下投票，它切换 onclick，但是当我点击向上投票时，例如它改变了图像上可绘制对象的颜色，但是点击影响其他卡片中的其他投票按钮。这是用于切换的代码。

boolean up, down, bookmark = false;

@Override
public void onBindViewHolder(final PostsViewHolder holder, int position) {

holder.upvote.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(!up){
                holder.upvote.setColorFilter(context.getResources().getColor(R.color.colorAccent));
                holder.downvote.setColorFilter(null);
                holder.downCount.setText("0");
                holder.upCount.setText("1");

                up = true;
                down = false;
            }
            else{
                holder.upvote.setColorFilter(null);
                holder.downCount.setText("0");
                holder.upCount.setText("0");
                up = false;
            }
        }
    });

这是整个适配器类

public class NewsAdapter extends RealmBaseRecyclerViewAdapter<NewsTrend, NewsAdapter.PostsViewHolder> {

public RealmResults<NewsTrend> realmResults;
public Context context;
public EventListener eventListener;

 static boolean up, down, bookmark = false;

public NewsAdapter(Context context, RealmResults<NewsTrend> realmResults, boolean automaticUpdate) {
    super(context, realmResults, automaticUpdate);
    this.realmResults = realmResults;
    this.context = context;
}

public void setEventListener(EventListener eventListener) {
    this.eventListener = eventListener;
}

@Override
public PostsViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
    View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.recycler_news_list_items, viewGroup, false);
    PostsViewHolder mediaViewHolder = new PostsViewHolder(v);
    return mediaViewHolder;
}

@Override
public void onBindViewHolder(final PostsViewHolder holder, int position) {

    final NewsTrend postsData = getItem(position);

    String eventName = postsData.getTitle();
    String eventDate = postsData.getTimestamp();




    Spanned decodedTitle = Html.fromHtml(eventName);

    if(postsData.getType().equals("bella")){
        holder.sourceImage.setImageResource(R.drawable.bella);
    }else if(postsData.getType().equals("punch")){
        holder.sourceImage.setImageResource(R.drawable.punch);
    }else if(postsData.getType().equals("linda")){
        holder.sourceImage.setImageResource(R.drawable.lib);
    }

    holder.eventName.setText(decodedTitle);
    holder.startEvent.setText(getSplitDate(eventDate));
    holder.eventDescription.setText(postsData.getHref());
    holder.sourceName.setText(postsData.getType());

        Glide.with(context)
                .load(postsData.getImage())
                .centerCrop()
                .placeholder(R.drawable.tw_logo)
                .into(holder.mDisplayGeneratedImage);

    /*Animation animation;
    animation = AnimationUtils.loadAnimation(context, R.anim.fade_in);
    holder.postContentHolder.startAnimation(animation);*/

    holder.postContentHolder.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(final View v) {
            new FinestWebView.Builder(context)
                    .theme(R.style.FinestWebViewTheme)
                    .titleDefault("What's Trending")
                    .showUrl(false)
                    .statusBarColorRes(R.color.bluePrimaryDark)
                    .toolbarColorRes(R.color.colorPrimary)
                    .titleColorRes(R.color.finestWhite)
                    .urlColorRes(R.color.colorPrimaryDark)
                    .iconDefaultColorRes(R.color.finestWhite)
                    .progressBarColorRes(R.color.PrimaryDarkColor)
                    .stringResCopiedToClipboard(R.string.copied_to_clipboard)
                    .stringResCopiedToClipboard(R.string.copied_to_clipboard)
                    .stringResCopiedToClipboard(R.string.copied_to_clipboard)
                    .showSwipeRefreshLayout(true)
                    .swipeRefreshColorRes(R.color.bluePrimaryDark)
                    .menuSelector(R.drawable.selector_light_theme)
                    .menuTextGravity(Gravity.CENTER)
                    .menuTextPaddingRightRes(R.dimen.defaultMenuTextPaddingLeft)
                    .dividerHeight(0)
                    .gradientDivider(false)
                    .setCustomAnimations(R.anim.slide_up, R.anim.hold, R.anim.hold, R.anim.slide_down)
                    .show(postsData.getHref());
        }
    });



    holder.share.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent sharingIntent = new Intent(android.content.Intent.ACTION_SEND);
            sharingIntent.setType("text/plain");
            String shareBody = postsData.getHref();
            sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, postsData.getTitle());
            sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, shareBody);
            context.startActivity(Intent.createChooser(sharingIntent, "Share via"));
        }
    });


    holder.upvote.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(!up){
                holder.upvote.setColorFilter(context.getResources().getColor(R.color.colorAccent));
                holder.downvote.setColorFilter(null);
                holder.downCount.setText("0");
                holder.upCount.setText("1");

                up = true;
                down = false;
            }
            else{
                holder.upvote.setColorFilter(null);
                holder.downCount.setText("0");
                holder.upCount.setText("0");
                up = false;
            }
        }
    });

    holder.downvote.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(!down){
                holder.downvote.setColorFilter(context.getResources().getColor(R.color.colorAccent));
                holder.upvote.setColorFilter(null);
                holder.downCount.setText("1");
                holder.upCount.setText("0");
                up = false;
                down = true;
            }
            else{
                holder.downvote.setColorFilter(null);
                holder.downCount.setText("0");
                holder.upCount.setText("0");
                down = false;
            }
        }
    });


    holder.bookmark.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(!bookmark){
                holder.bookmark.setColorFilter(context.getResources().getColor(R.color.colorAccent));
                bookmark = true;
            }else{
                holder.bookmark.setColorFilter(null);
                bookmark = false;
            }
        }
    });



}

@Override
public NewsTrend getItem(int i) {
    return realmResults.get(i);
}

public void swapData(RealmResults<NewsTrend> realmResults) {
    this.realmResults = realmResults;
    notifyDataSetChanged();
}

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

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

public static class PostsViewHolder extends RecyclerView.ViewHolder {
    LinearLayout postContentHolder;

    public RobotoTextView startEvent;
    public RobotoTextView eventName;
    public RobotoTextView eventDescription;
    public RobotoTextView sourceName;

    public TextView upCount;
    public TextView downCount;

    public ImageButton share;
    public ImageButton upvote;
    public ImageButton downvote;
    public ImageButton bookmark;

    public ImageView sourceImage;
    public ImageView mDisplayGeneratedImage;

    PostsViewHolder(View itemView) {
        super(itemView);
        postContentHolder = (LinearLayout) itemView.findViewById(R.id.post_content_holder);
        startEvent = (RobotoTextView) itemView.findViewById(R.id.event_start);
        eventName = (RobotoTextView) itemView.findViewById(R.id.event_name);
        eventDescription = (RobotoTextView) itemView.findViewById(R.id.event_description);
        mDisplayGeneratedImage = (ImageView) itemView.findViewById(R.id.rlv_name_view);
        share = (ImageButton) itemView.findViewById(R.id.share);
        sourceName = (RobotoTextView) itemView.findViewById(R.id.sourceName);
        sourceImage = (ImageView) itemView.findViewById(R.id.sourceImg);
        upvote = (ImageButton) itemView.findViewById(R.id.upVote);
        downvote = (ImageButton) itemView.findViewById(R.id.downVote);
        upCount = (TextView) itemView.findViewById(R.id.upCount);
        downCount = (TextView) itemView.findViewById(R.id.downCount);
        bookmark = (ImageButton) itemView.findViewById(R.id.bookmark);
    }
}

public interface EventListener {
    void onItemClick(final View view, NewsTrend postsData);
}


public String getSplitDate(String dateString){

    String[] parts = dateString.split("T");
    String part1 = parts[0]; // 004

    return part1;
}

Answer 1

使用setTag()来识别点击的是哪个item，复制这段代码

boolean up, down, bookmark = false;

        @Override
        public void onBindViewHolder(final PostsViewHolder holder, int position) {

            holder.upvote.setTag(holder); // set tag to get clicked item view
            holder.upvote.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    PostsViewHolder viewHolder =(PostsViewHolder) v.getTag();
                    if(!v.isChecked()){ // I assume upvote is checkbox
                        viewHolder.upvote.setChecked(true)
                        viewHolder.upCount.setText("1");
                    }
                    else{
                       viewHolder.upvote.setChecked(false)
                        viewHolder.upCount.setText("0");
                    }
                }
            });

                holder.downvote.setTag(holder); // set tag to get clicked item view
                holder.downvote.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        PostsViewHolder viewHolder =(PostsViewHolder) v.getTag();
                        if(!v.isChecked()){ // I assume upvote is checkbox
                            viewHolder.downvote.setChecked(true)
                            viewHolder.downCount.setText("1");
                        }
                        else{
                           viewHolder.downvote.setChecked(false)
                            viewHolder.downCount.setText("0");
                        }
                    }
                });
    }

下面的方法对您在适配器类中的问题很重要

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

编辑

<CheckBox 
 android:id="@+id/upvote"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" 
 android:button="@drawable/uvselector" />

其中drawable/uvselector.xml喜欢

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">
 <item android:state_checked="false"
  android:drawable="@drawable/YOUR DISABLED UPVOTE IMAGE" />
 <item android:state_checked="true"
  android:drawable="@drawable/YOUR UPVOTE IMAGE" />
</selector>

其中drawable/dvselector.xml喜欢

<selector xmlns:android="http://schemas.android.com/apk/res/android">
 <item android:state_checked="false"
  android:drawable="@drawable/YOUR DISABLED DOWNVOTE IMAGE" />
 <item android:state_checked="true"
  android:drawable="@drawable/YOUR DOWNVOTE IMAGE" />
</selector>