android - recyclerview 仅突出显示一项

Question

我有回收站 View ，当我点击它时我会突出显示该项目，问题是我可以突出显示许多项目，我不会只有一个项目，当我点击进入项目时突出显示，当我点击另一个项目时也突出显示

这是我的适配器

public class ScreenRecyclerAdapter  extends RecyclerView.Adapter<ScreenRecyclerAdapter.ViewHolder> {
Context context;
int image_list[];
ImageView image_view_screen_item;

public ScreenRecyclerAdapter(int[] image_list, Context context){
    super();
    this.image_list = image_list;
    this.context = context;}


@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.screen_items, parent, false);
    ViewHolder viewHolder = new ViewHolder(v);
    return viewHolder;}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
    Picasso.with(context).load(image_list[position]).into(holder.image_view_screen_item);
     holder.list_row.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {

         }
     });
   }

@Override
public int getItemCount() {
    return image_list.length;
}
class ViewHolder extends RecyclerView.ViewHolder{
    ImageView image_view_screen_item , back;
    RelativeLayout list_row;
    public ViewHolder(View itemView) {
        super(itemView);
        image_view_screen_item = (ImageView) itemView.findViewById(R.id.plantImageView);
        list_row = (RelativeLayout) itemView.findViewById(R.id.list_row);
        list_row.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                    list_row.setBackgroundColor(Color.parseColor("#d5d5d5"));
                    Intent i = new Intent(context, ImagePager.class);
                    context.startActivity(i);
            }
        });
    }}}

Answer 1

首先为您的适配器定义一个包含每一行的 RelativeLayouts 列表:

List<RelativeLayout> items;

然后在您的 onBindViewHolder 方法中，添加:

items.add(holder.list_row);

现在像这样向您的适配器添加一个方法:

private void makeAllWhite() {
    for(RelativeLayout item : items) {
        item.setBackgroundColor(Color.parseColor("#ffffff"));
    }
}

最后在这一行之前:

list_row.setBackgroundColor(Color.parseColor("#d5d5d5"));

调用:

makeAllWhite();

你的最终代码应该是这样的:

public class ScreenRecyclerAdapter  extends RecyclerView.Adapter<ScreenRecyclerAdapter.ViewHolder> {
    Context context;
    int image_list[];
    ImageView image_view_screen_item;
    List<RelativeLayout> items;

    public ScreenRecyclerAdapter(int[] image_list, Context context){
        super();
        this.image_list = image_list;
        this.context = context;
        this.items = new ArrayList<>();
    }


    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.screen_items, parent, false);
        ViewHolder viewHolder = new ViewHolder(v);
        return viewHolder;}
    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        items.add(holder.list_row);
        Picasso.with(context).load(image_list[position]).into(holder.image_view_screen_item);
    }

    @Override
    public int getItemCount() {
        return image_list.length;
    }
    class ViewHolder extends RecyclerView.ViewHolder{
        ImageView image_view_screen_item , back;
        RelativeLayout list_row;
        public ViewHolder(View itemView) {
            super(itemView);
            image_view_screen_item = (ImageView) itemView.findViewById(R.id.plantImageView);
            list_row = (RelativeLayout) itemView.findViewById(R.id.list_row);
            list_row.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                        makeAllWhite();
                        list_row.setBackgroundColor(Color.parseColor("#d5d5d5"));
                        Intent i = new Intent(context, ImagePager.class);
                        context.startActivity(i);
                }
            });
        }
    }
    private void makeAllWhite() {
        for(RelativeLayout item : items) {
            item.setBackgroundColor(Color.parseColor("#ffffff")));
        }
    }
}