Question

我有一个RecyclerView Adapter类，我想过滤我的List，我想在List类上过滤我的列表，这是我的适配器类：

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> implements View.OnClickListener {
private LayoutInflater inflater;
private List<FeedItem> list;
Context ctx;

public MyAdapter(Context context, List<FeedItem> feedItemList) {
    inflater = LayoutInflater.from(context);
    this.list = feedItemList;
}


@Override
public MyViewHolder onCreateViewHolder(ViewGroup parrent, int i) {
    View view = inflater.inflate(R.layout.homepage_parts, parrent, false);
    MyViewHolder holder = new MyViewHolder(view);
    return holder;
}

@Override
public void onBindViewHolder(final MyViewHolder viewHolder, int position) {
    FeedItem item = list.get(position);
    viewHolder.name.setText(item.getname());
}



@Override
public int getItemCount() {
    if (list == null)
        return 0;
    else
        return list.size();
}



class MyViewHolder extends RecyclerView.ViewHolder{
    TextView name;

    public MyViewHolder(View itemView) {
        super(itemView);
        name = (TextView) itemView.findViewById(R.id.tvname);
        name.setTypeface(typeface);


    }

}

}

如何在List中过滤我的数据并更新适配器？

Answer 1

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> implements View.OnClickListener {
private LayoutInflater inflater;
private List<FeedItem> list;
private List<FeedItem> copyList;
Context ctx;

public MyAdapter(Context context, List<FeedItem> feedItemList) {
    inflater = LayoutInflater.from(context);
    this.list = feedItemList;
    this.copyList = feedItemList;
}

public void filter(String charText) {
    charText = charText.toLowerCase(Locale.getDefault());
    list.clear();
    if (charText.length() == 0) {
        list.addAll(copyList);
    }
    else
    {
        for (FeedItem feedItem : copyList) {
            if (feedItem.getname().toLowerCase(Locale.getDefault()).contains(charText)) {
                list.add(feedItem);
            }
        }
    }
    notifyDataSetChanged();
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parrent, int i) {
    View view = inflater.inflate(R.layout.homepage_parts, parrent, false);
    MyViewHolder holder = new MyViewHolder(view);
    return holder;
}

@Override
public void onBindViewHolder(final MyViewHolder viewHolder, int position) {
    FeedItem item = list.get(position);
    viewHolder.name.setText(item.getname());
}



@Override
public int getItemCount() {
    if (list == null)
        return 0;
    else
        return list.size();
}



class MyViewHolder extends RecyclerView.ViewHolder{
    TextView name;

    public MyViewHolder(View itemView) {
        super(itemView);
        name = (TextView) itemView.findViewById(R.id.tvname);
        name.setTypeface(typeface);


    }

}

Answer 2

你可以使用

public int getItemViewType(int position)

获取回收器视图中每个项目的Type的方法。这将为您提供由getView（int，View，ViewGroup）为指定项创建的View类型。

Answer 3

在您的适配器和您的活动中实施Filterable，使用setOnQueryTextListener添加searchview ...

this链接可以帮助您了解可过滤的示例。

Answer 4

public class AdapterData extends RecyclerView.Adapter<AdapterData.MyViewHolder> {
    private Context mContext;
    Data object;
    private ArrayList<Data> mArrayList;
    private ArrayList<Data> mFilteredList;
    public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView title, count,yayayan;
        public ImageView thumbnail, imgLike;

        public MyViewHolder(View view) {
            super(view);
            title = (TextView) view.findViewById(R.id.title);
            yayayan = (TextView) view.findViewById(R.id.yayasan);
            count = (TextView) view.findViewById(R.id.count);
            thumbnail = (ImageView) view.findViewById(R.id.thumbnail);
            imgLike = (ImageView) view.findViewById(R.id.imgLike);
        }
    }


    public AdapterData(Context mContext, ArrayList<Data> arraylist) {
        this.mContext = mContext;
        mArrayList = arraylist;
        mFilteredList = arraylist;

        }


    @Override
    public AdapterData.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.item_data, parent, false);

        return new AdapterData.MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(final AdapterData.MyViewHolder holder, int position) {
        final Data d = mFilteredList.get(position);
        holder.title.setText(d.getNama_data());
        holder.yayayan.setText(d.getNama_yayasan());
        holder.count.setText(d.getTtl_like() + " Like");


    }
    public void filter(String charText) {
        charText = charText.toLowerCase(Locale.getDefault());
        if (charText.length() == 0) {//jika string kosong
            mFilteredList = mArrayList;
        } else {//filter dan buat arraybaru dengan filter query model
            ArrayList<Data> filteredList = new ArrayList<>();

            for (Data wp : mArrayList) {
                if (wp.getNama_data().toLowerCase(Locale.getDefault()).contains(charText)) {
                    filteredList.add(wp);
                }
            }
            mFilteredList = filteredList;

        }
        //memperbarui list adapter
        notifyDataSetChanged();
    }


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

并且您的actity或片段将Arraylist数据集发送到适配器，我希望此示例可以帮助您^^^

android-如何过滤RecyclerView适配器

4 个答案: