RecyclerView搜索过滤器位置错误

问题描述

我使用RecyclerView并对其进行了过滤，出现了问题

i use RecyclerView and i made filter on it and i have problem

搜索后，当我按一下项目时，我得到的位置不正确，不是我搜索过的那个，请帮助我解决此问题

after i search when i press on item i get wrong position not one i searched it please help me to solve this problem

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();
}}

活动

@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;
}

推荐答案

recyclerview 重用现有元素，并将新数据简单地绑定到这些元素上-这样就可以防止需要创建和创建项目.销毁，而是回收；).

The recyclerview re-uses existing elements and simply binds new data to these elements--this prevents items needing to be created & destroyed, instead they are recycled ;).

看看您的 ViewHolder 的构造函数.在其中，您传递ViewHolders绑定到的数据的初始列表.实际上，这将创建一个静态绑定到您的初始列表，不是过滤后的列表:

Take a look at the constructor of your ViewHolder. In it you pass in the initial list of data your ViewHolders are binding to. In effect, this creates a static binding to your initial list, not the filtered list:

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

可能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:

What may work better is to make better use of the onBindViewHolder of the RecyclerViewAdapter. This will allow the ViewHolder to use the current items in the adapter at the time of the click as follows:

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

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

如下更新您的 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);
    }
}

• 在获得点击的项目及其在RecyclerView中的位置中查看此答案，以提供一种更好的方法.
li>
• 如果可以，请尽量避免传递上下文.
• 保留字段 private
• Take a look at this answer for Get clicked item and its position in RecyclerView to provide a better approach.
• If you can, try to avoid passing your context around.
• Keep fields private

祝你好运！

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