清除可搜索列表视图

Question

我正在关注android配置单元教程以制作自定义列表视图+可搜索的listview。教程很容易遵循，但是当我在Lazyadapter中添加getFilter（）时，问题就出现了。搜索编辑框可以过滤列表视图，但在清除textview时，不会显示列表视图的原始数据。

这是我的代码

package com.example.androidhive; 

import java.util.ArrayList; 
import java.util.HashMap; 

import android.app.Activity; 
import android.content.Context; 
import android.text.TextUtils; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.ImageView; 
import android.widget.TextView; 

public class LazyAdapter extends BaseAdapter { 

    private Activity activity; 
    private ArrayList<HashMap<String, String>> data; 
    private static LayoutInflater inflater=null; 
    public ImageLoader imageLoader; 

    public LazyAdapter(Activity a, ArrayList<HashMap<String, String>> d) { 
     activity = a; 
     data=d; 
     inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     imageLoader=new ImageLoader(activity.getApplicationContext()); 
    } 

    public int getCount() { 
     return data.size(); 
    } 

    public Object getItem(int position) { 
     return position; 
    } 

    public long getItemId(int position) { 
     return position; 
    } 

    public View getView(int position, View convertView, ViewGroup parent) { 
     View vi=convertView; 
     if(convertView==null) 
      vi = inflater.inflate(R.layout.list_row, null); 

     TextView title = (TextView)vi.findViewById(R.id.title); // title 
     TextView artist = (TextView)vi.findViewById(R.id.artist); // artist name 
     TextView duration = (TextView)vi.findViewById(R.id.duration); // duration 
     ImageView thumb_image=(ImageView)vi.findViewById(R.id.list_image); // thumb image 

     HashMap<String, String> song = new HashMap<String, String>(); 
     song = data.get(position); 

     // Setting all values in listview 
     title.setText(song.get(CustomizedListView.KEY_TITLE)); 
     artist.setText(song.get(CustomizedListView.KEY_ARTIST)); 
     duration.setText(song.get(CustomizedListView.KEY_DURATION)); 
     imageLoader.DisplayImage(song.get(CustomizedListView.KEY_THUMB_URL), thumb_image); 
     return vi; 
    } 

    public android.widget.Filter getFilter() { 
     // TODO Auto-generated method stub 
     return new android.widget.Filter() { 

      @Override 
      protected FilterResults performFiltering(CharSequence constraint) { 
       FilterResults Result = new FilterResults(); 
       // if constraint is empty return the original names 
       if (TextUtils.isEmpty(constraint)){ 
        //Result.values = storedata; 
        Result.count = data.size(); 
        Result.values = data; 
        return Result; 
       } 

       ArrayList<HashMap<String, String>> Filtered_Names = new ArrayList<HashMap<String, String>>(); 
       String filterString = constraint.toString().toLowerCase(); 
       String filterableString; 

       for(int i = 0; i<data.size(); i++){ 
        HashMap<String,String> searchdata = data.get(i); 
        String itemsearched = searchdata.get(CustomizedListView.KEY_TITLE); 

        filterableString = itemsearched; 
        if(filterableString.toLowerCase().contains(filterString)){ 
        Filtered_Names.add(data.get(i)); 
        Log.e("Added", String.valueOf(Filtered_Names.size())); 
        } 

        } 
       Result.values = Filtered_Names; 
       Result.count = Filtered_Names.size(); 
       Log.e("Results", Result.values.toString() + String.valueOf(Result.count)); 
       return Result; 
      } 

      @Override 
      protected void publishResults(CharSequence constraint, 
        FilterResults results) { 
       // TODO Auto-generated method stub 
        ArrayList<HashMap<String, String>> resultList = (ArrayList<HashMap<String, String>>) results.values; 
        LazyAdapter.this.data = resultList; 
        LazyAdapter.this.notifyDataSetChanged(); 
      } 

     }; 
    } 
} 

Answer 1

此行LazyAdapter.this.data = resultList;实际上改变了数据的价值，所以，当你在空约束部分去，你只是不修改当前过滤。

保持到第一数据由设定的基准：

1. 声明一个private ArrayList<HashMap<String, String>> origData;
2. 影响它在构造：origData = d;
3. 在过滤器中使用它为空约束的情况下

喜欢如下

Result.count = origData.size(); 
Result.values = origData;