android - RecyclerView 搜索过滤器位置错误

Question

我使用 RecyclerView 并对其进行了过滤，但我遇到了问题

在我搜索后，当我按下项目时，我得到了错误的位置，不是我搜索过的，请帮助我解决这个问题

RecyclerView 适配器

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {

Context context;
List<listitem_gib> getDataAdapter;



public RecyclerViewAdapter(List<listitem_gib> getDataAdapter, Context context){

    super();

    this.getDataAdapter = getDataAdapter;
    this.context = context;

}

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardview_layout, parent, false);

    ViewHolder viewHolder = new ViewHolder(v,context,getDataAdapter);

    return viewHolder;
}

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

    listitem_gib getDataAdapter1 =  getDataAdapter.get(position);

    holder.name.setText(getDataAdapter1.getName());
    holder.num.setText(getDataAdapter1.getnum());
    Picasso.with(context).load("http://i-geeky.info/android/image/" + getDataAdapter1.getimg()).into(holder.img1);


}

@Override
public int getItemCount() {

    return getDataAdapter.size();
}

class ViewHolder extends RecyclerView.ViewHolder
            implements View.OnClickListener{

    public TextView name;
    public TextView num;
    public ImageView img1;

    ImageButton fav;

    Context context;
    List<listitem_gib> getDataAdapter;


    public ViewHolder(View itemView, Context context ,List<listitem_gib> getDataAdapter ) {

        super(itemView);
        itemView.setOnClickListener(this);
        this.getDataAdapter = getDataAdapter;
        this.context = context;
        this.fav= (ImageButton) itemView.findViewById(R.id.btn_fav);

        name = (TextView) itemView.findViewById(R.id.Main_Text) ;
        num = (TextView) itemView.findViewById(R.id.Second_Text) ;
        img1 = (ImageView) itemView.findViewById(R.id.img1) ;

    }


    @Override
    public void onClick(View v) {

        int position = getAdapterPosition();
        listitem_gib getDataAdapter =this.getDataAdapter.get(position);
        Intent intent = new Intent(this.context,Rewaya_info.class);
        intent.putExtra("name",getDataAdapter.getName());
        intent.putExtra("url",getDataAdapter.geturl());
        intent.putExtra("img",getDataAdapter.getimg());
        intent.putExtra("num",getDataAdapter.getnum());
        intent.putExtra("size",getDataAdapter.getsize());
        this.context.startActivity(intent);

    }
}
public void setFilter(List<listitem_gib> newList)
{
    getDataAdapter = new ArrayList<>();
    getDataAdapter.addAll(newList );
    notifyDataSetChanged();
}}

Activity

@Override
public boolean onQueryTextChange(String newText) {

    newText = newText.toLowerCase();
    List<listitem_gib> newList = new ArrayList<>();
    for (listitem_gib list : GetDataAdapter1){
        String name = list.getName().toLowerCase();
        String name1 = list.getnum().toLowerCase();

        if (name.contains(newText) || name1.contains(newText)){
            newList.add(list);
        }
    }
    recyclerViewadapter.setFilter(newList);
    return true;
}

Answer 1

recyclerview 重用现有元素并简单地将新数据绑定(bind)到这些元素——这可以防止需要创建和销毁的项目，而是回收它们;)。

查看ViewHolder 的构造函数。在其中您传入您的 ViewHolder 绑定(bind)到的初始数据列表。实际上，这会创建一个静态绑定(bind)到您的初始列表，不是过滤后的列表:

public ViewHolder(View itemView, Context context ,List<listitem_gib> getDataAdapter ) {
    super(itemView);
    itemView.setOnClickListener(this);
    this.getDataAdapter = getDataAdapter; <-- this is stored in the viewholder
    ...
}

更好的方法是更好地利用 RecyclerViewAdapter 的 onBindViewHolder。这将允许 ViewHolder 在单击时使用适配器中的当前项，如下所示:

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

    listitem_gib item =  getDataAdapter.get(position);
    holder.bind(item);
}

按如下方式更新您的 ViewHolder:

class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{

    private TextView name;
    private TextView num;
    private ImageView img1;

    ImageButton fav;

    Context context;
    private listitem_gib currentItem; //<-- allows this viewholder to keep a reference to the bound item

    public ViewHolder(View itemView, Context context) {  //<-- no more adapter in constructor
        super(itemView);
        itemView.setOnClickListener(this);
        this.context = context;
        this.fav = (ImageButton) itemView.findViewById(R.id.btn_fav);
        name = (TextView) itemView.findViewById(R.id.Main_Text) ;
        num = (TextView) itemView.findViewById(R.id.Second_Text) ;
        img1 = (ImageView) itemView.findViewById(R.id.img1) ;
    }

    void bind (listitem_gib item) {  //<--bind method allows the ViewHolder to bind to the data it is displaying
        name.setText(item.getName());
        num.setText(item.getnum());
        Picasso.with(this.context).load("http://i-geeky.info/android/image/" + item.getimg()).into(holder.img1);
        currentItem = item; //<-- keep a reference to the current item
    }

    @Override
    public void onClick(View v) {
        Intent intent = new Intent(this.context,Rewaya_info.class);
        intent.putExtra("name",currentItem.getName());  // <-- makes use of currentItem instead of adapter
        intent.putExtra("url",currentItem.geturl());
        intent.putExtra("img",currentItem.getimg());
        intent.putExtra("num",currentItem.getnum());
        intent.putExtra("size",currentItem.getsize());
        this.context.startActivity(intent);
    }
}

• 查看 Get clicked item and its position in RecyclerView 的答案提供更好的方法。
• 如果可以，尽量避免传递上下文。
• 保持字段私有(private)

祝你好运!