我正在尝试编写一个自定义过滤器来过滤我的数组适配器中的数组列表，以便在我单击按钮时过滤我的 ListView 。

例如当我点击我的按钮时

public void onClick(View arg0) {
            String abc = "abc";
            m_adapter.getFilter().filter(abc);
        }

但是，当我点击我的按钮时，我的应用程序意外终止。这是我的数组适配器和过滤器代码。请帮助我。

package com.ntu.rosemobile.searchlist;

public class ResultsAdapter extends ArrayAdapter<SearchItem> implements Filterable{

public ArrayList<SearchItem> subItems;
public ArrayList<SearchItem> allItems;
private LayoutInflater inflater;
private PTypeFilter filter;

public ResultsAdapter(Context context, int textViewResourceId, ArrayList<SearchItem> items) {
        
    super(context, textViewResourceId, items);
        this.subItems = items;
        this.allItems = this.subItems;
        inflater= LayoutInflater.from(context);
}

@Override
public Filter getFilter() {
    if (filter == null){
      filter  = new PTypeFilter();
    }
    return filter;
  }



//@Override
public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;
        if (v == null) {
            
            v = inflater.inflate(R.layout.listrow, null);
        }
        SearchItem o = subItems.get(position);
        if (o != null) {
                TextView pname = (TextView) v.findViewById(R.id.productname);
                TextView neg = (TextView) v.findViewById(R.id.negNum);
                TextView pos = (TextView) v.findViewById(R.id.posNum);
                TextView neu = (TextView) v.findViewById(R.id.neuNum);
                
                WebImageView productPhoto = (WebImageView)v.findViewById(R.id.pPhoto);
                if(productPhoto!=null){
                    productPhoto.setImageUrl(o.getImageUrl().toString());
                    productPhoto.loadImage();
                }
                if(pname!= null){
                    pname.setText(o.getProductName().toString());
                }                    
                if (neg != null) {
                      String a =  "" + o.getNegativeReviews();
                      neg.setText(a);                            
                }
                if(neu != null){
                     String a =  "" + o.getNeutralReviews();
                     neu.setText(a);
                }
                if(pos != null){
                    String a =  "" + o.getPositiveReviews();
                    pos.setText(a);
                }
        }
        return v;
}

private class PTypeFilter extends Filter{

    
    @SuppressWarnings("unchecked")
    @Override
    protected void publishResults(CharSequence prefix,
                                  FilterResults results) {
      // NOTE: this function is *always* called from the UI thread.
       subItems =  (ArrayList<SearchItem>)results.values;
        
        notifyDataSetChanged();
    }
    
    @SuppressWarnings("unchecked")
    protected FilterResults performFiltering(CharSequence prefix) {
          // NOTE: this function is *always* called from a background thread, and
          // not the UI thread. 
          
          FilterResults results = new FilterResults();
          ArrayList<SearchItem> i = new ArrayList<SearchItem>();
          
          if (prefix!= null && prefix.toString().length() > 0) {

              for (int index = 0; index < allItems.size(); index++) {
                  SearchItem si = allItems.get(index);
                  if(si.getPType().compareTo(prefix.toString()) == 0){
                    i.add(si);  
                  }
              }
              results.values = i;
              results.count = i.size();                   
          }
          else{
              synchronized (allItems){
                  results.values = allItems;
                  results.count = allItems.size();
              }
          }
          
          return results;
    }
  }     
}

最佳答案

您需要覆盖 ArrayAdapter 类中的 getCount() 方法。

关于Android 如何覆盖我的 ArrayAdapter 的过滤器？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/2208225/