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listview is blank while using getfilter function


listview is blank while using getfilter function  using -'java,android,listview'

I am trying to implement the getFilter() function in my ListView but everytime I enter something in the EditText my ListView disappears.

My SetHelpRows file:

public class SetHelpRows {
    String name;
    String id;

    public String getName () {
        return name;
    }

    public void setName (String name) {
        this.name = name;
    }

    public String getID () {
        return id;
    }

    public void setID (String id) {
        this.id = id;
    }

    public SetHelpRows(String name, String id) {
        super();
        this.name = name;
        this.id = id;
    }
}


My SetHelpRowsCustomAdapter file:

import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.ImageView;
import android.widget.TextView;

public class SetRowsCustomAdapter extends ArrayAdapter<SetRows> {
    Context context;
   int layoutResourceId;
   ArrayList<SetRows> data=new ArrayList<SetRows>();
   private ArrayList<SetRows> original;
   private ArrayList<SetRows> fitems;
   private Filter filter;


   public SetRowsCustomAdapter(Context context, int layoutResourceId, ArrayList<SetRows> data) {
       super(context, layoutResourceId, data);
       this.layoutResourceId = layoutResourceId;
       this.context = context;
       this.data = data;

       this.original = data;//new ArrayList<Pkmn>();
       this.fitems = data;//new ArrayList<Pkmn>();
   }

   @Override
   public View getView(int position, View convertView, ViewGroup parent) {
       View row = convertView;
       ImageHolder holder = null;

       if(row == null)
       {
           LayoutInflater inflater = ((Activity)context).getLayoutInflater();
           row = inflater.inflate(layoutResourceId, parent, false);

           holder = new ImageHolder();
           holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle);
           holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon);
           holder.txtID = (TextView)row.findViewById(R.id.txtModDate);
           row.setTag(holder);
       }
       else
       {
           holder = (ImageHolder)row.getTag();
       }

       SetRows myImage = data.get(position);
       holder.txtTitle.setText(myImage.name);
       holder.txtID.setText(myImage.id);
       int outImage=myImage.image;
       holder.imgIcon.setImageResource(outImage);
      return row;

   }

   static class ImageHolder
   {
       ImageView imgIcon;
       TextView txtTitle;
       TextView txtID;
   }

   @Override
   public Filter getFilter()
   {
       if (filter == null) {
           Log.i("Before Filter", "Before Filter");
           filter = new PkmnNameFilter();
       }

       return filter;
   }

   private class PkmnNameFilter extends Filter
   {
           @Override
           protected FilterResults performFiltering(CharSequence constraint)
           {   
               FilterResults results = new FilterResults();
               String prefix = constraint.toString().toLowerCase();

               if (prefix == null || prefix.length() == 0)
               {
                   Log.i("prefix is null or 0", "prefix is null or 0");
                   ArrayList<SetRows> list = new ArrayList<SetRows>(original);
                   results.values = list;
                   results.count = list.size();
               }
               else
               {
                   Log.i("prefix is !null or !0", "prefix is !null or !0");
                   final ArrayList<SetRows> list = new ArrayList<SetRows>(original);
                   final ArrayList<SetRows> nlist = new ArrayList<SetRows>();
                   int count = list.size();

                   for (int i=0; i<count; i++)
                   {
                       final SetRows pkmn = list.get(i);
                       final String value = pkmn.getName().toLowerCase();

                       if (value.startsWith(prefix))
                       {
                           nlist.add(pkmn);
                       }
                   }
                   results.values = nlist;
                   results.count = nlist.size();
               }
               return results;
           }

           @SuppressWarnings("unchecked")
           @Override
           protected void publishResults(CharSequence constraint, FilterResults results) {

               Log.i("publish result", "publish result");
               fitems = (ArrayList<SetRows>)results.values;

               clear();
               int count = fitems.size();
               for (int i=0; i<count; i++)
               {
                   SetRows pkmn = (SetRows)fitems.get(i);
                   add(pkmn);
               }
           }

       }
}


My partial MainActivity file:

inputSearch = (EditText) findViewById(R.id.etSearch);
dataList = (ListView) findViewById(R.id.lvFiles);
for (int y=0; y<strNames.length;y++) {
    name = strNamesOfAllah[y];
    meaning = strMeaning[y];
    rowsArray.add(new SetRows(R.drawable.icon, name, meaning));
}
adapter = new SetRowsCustomAdapter(MainActivity.this, R.layout.customlist, rowsArray);
dataList.setAdapter(adapter);
dataList.setClickable(true);
inputSearch.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
        // When user changed the Text
        //MainActivity.this.adapter.getFilter().filter(cs);
        //String text = inputSearch.getText().toString().toLowerCase();
        adapter.getFilter().filter(cs.toString().toLowerCase(Locale.US));
    }

    @Override
    public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
        //TODO Auto-generated method stub
    }

    @Override
    public void afterTextChanged(Editable arg0) {
        //TODO Auto-generated method stub                         
    }
});


In the LogCat I do see the following:

12-12 12:15:57.077: I/Before Filter(720): Before Filter
12-12 12:15:57.106: I/prefix is !null or !0(720): prefix is !null or !0
12-12 12:15:57.216: I/publish result(720): publish result

    

asked Sep 24, 2015 by okesh.badhiye
0 votes
3 views



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