RecyclerView Adapter高亮显示已单击或当前项目

时间:2019-11-06 07:51:30

标签: java android android-recyclerview recycler-adapter

由于我是android的新手,所以我努力强调Recyclerview单击的或当前的项目。我尝试了一些解决方法,但没有任何帮助。基本上,我想突出显示选定的项目,即使它是从各自的片段中回来的。请检查我的代码并帮助我完成。谢谢。

public class ContentaAdapter extends RecyclerView.Adapter<ContentaAdapter.MyViewHolder>  {

    Context context;

    ArrayList<String> ItemTitle;
    ArrayList<String> ItemSource;

    public ContentaAdapter(Context context, ArrayList<String> ItemTitle, ArrayList<String> ItemSource) {
        this.context = context;
        this.ItemTitle = ItemTitle;
        this.ItemSource = ItemSource;

    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.home_items_layout, parent, false);
        MyViewHolder vh = new MyViewHolder(v);
        return vh;
    }
    @Override
    public void onBindViewHolder(final MyViewHolder holder, final int position) {
        holder.ItemTitle.setText(ItemTitle.get(position));
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Fragment contentdisplay = new ViewContentFragment();
                Bundle bundle=new Bundle();
                bundle.putStringArrayList("ItemTitle",ItemTitle);
                bundle.putStringArrayList("ItemSource",ItemSource);
                bundle.putInt("position",position);
                bundle.putInt("ItemCounts",ItemTitle.size());
                contentdisplay.setArguments(bundle);
                ((MainActivity)context).replaceFragment(contentdisplay);
            }
        });

    }

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

    public class MyViewHolder extends RecyclerView.ViewHolder {
        TextView ItemTitle;
        public MyViewHolder(View itemView) {
            super(itemView);
            ItemTitle = (TextView) itemView.findViewById(R.id.item_title);
        }
    }
}

1 个答案:

答案 0 :(得分:0)

您需要将isSelected状态添加到列表项数据模型中并对其进行更改onClick

知道状态后,您可以在ViewHolder中更改背景

 if (isSelected) {
            //  set selected background here
        } else {
            //  set not selected background here
        }

并且不要在适配器中保留两个列表,而应使用类似于以下内容的模型ArrayList<DataModel>创建一个列表:

class DataModel {
    String ItemTitle;
    String ItemSource;
    Boolean isSelected;
}

您也不应该将两个列表都传递给其他片段,而应仅取所需的内容,例如yourList.get(position);