Intentando buscar en una lista de elementos usando edittext, donde hacer clic en el elemento buscado devuelve la posición incorrecta.

Se supone que busco "C" en la lista dada, donde el elemento de la lista es el siguiente "A", "B", "C", "D", "CC", y obtuve el resultado de búsqueda correcto, pero una vez que se hizo clic en el elemento de búsqueda, Se devuelve la posición del artículo equivocado.

Aquí Edittext addTextChangedListener:

edtSearch.addTextChangedListener(new TextWatcher() {

            public void onTextChanged(CharSequence s, int start, int before,
                    int count) {
                adapter.getFilter().filter(s);
                adapter.notifyDataSetChanged();

            }

            public void beforeTextChanged(CharSequence s, int start, int count,
                    int after) {

            }

            public void afterTextChanged(Editable s) {
            }
        });
    }

Código de clase completo:

    package com.tomar.xyz;

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

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;

public class Tabtwo extends Activity implements OnItemClickListener {

    ListView listView;
    TextView txt;

    ArrayAdapter<String> adapter;

    // Search EditText
    EditText edtSearch;

    // Array of strings storing country names
    String[] countries = new String[] { "Admin Cost", "Affinity Diagram",
            "Analyse", "Apprasal Costs", "Assessment of Stakeholders",
              };

    // Array of integers points to images stored in /res/drawable-ldpi/
    int[] flags = new int[] { R.drawable.admin, R.drawable.affinity,
            R.drawable.analysis, R.drawable.appraisal, R.drawable.assessment,
              };

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.tabtwo);

        // Each row in the list stores country name, currency and flag
        List<HashMap<String, String>> aList = new ArrayList<HashMap<String, String>>();

        for (int i = 0; i < 4; i++) {
            HashMap<String, String> hm = new HashMap<String, String>();
            hm.put("txt", countries[i]);

            hm.put("flag", Integer.toString(flags[i]));
            aList.add(hm);
        }

        // Keys used in Hashmap
        String[] from = { "flag", "txt" };

        // Ids of views in listview_layout
        int[] to = { R.id.flag, R.id.txt };

        // Instantiating an adapter to store each items
        // R.layout.listview_layout defines the layout of each item
        final SimpleAdapter adapter = new SimpleAdapter(getBaseContext(),
                aList, R.layout.listview_layout, from, to);

        // Getting a reference to listview of main.xml layout file
        ListView listView = (ListView) findViewById(R.id.listview);
        edtSearch = (EditText) findViewById(R.id.Search_box);
        txt = (TextView) findViewById(R.id.txt);
        listView.setOnItemClickListener(this);
        // Setting the adapter to the listView
        listView.setAdapter(adapter);

        listView.setTextFilterEnabled(true);
        listView.setOnItemClickListener(this);
        edtSearch.addTextChangedListener(new TextWatcher() {

            public void onTextChanged(CharSequence s, int start, int before,
                    int count) {
                adapter.getFilter().filter(s);
                adapter.notifyDataSetChanged();

            }

            public void beforeTextChanged(CharSequence s, int start, int count,
                    int after) {

            }

            public void afterTextChanged(Editable s) {
            }
        });
    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int position,
            long arg3) {
        // TODO Auto-generated method stub
        if (position == 0) {
            Intent int0 = new Intent(getApplicationContext(), Admincost.class);
            startActivity(int0);
        }

        if (position == 1) {
            Intent int1 = new Intent(getApplicationContext(), Affinity.class);
            startActivity(int1);
        }
        if (position == 2) {
            Intent int2 = new Intent(getApplicationContext(), Analyse.class);
            startActivity(int2);
        }

        if (position == 3) {
            Intent int3 = new Intent(getApplicationContext(),
                    ApprasalCosts.class);
            startActivity(int3);
        }
        if (position == 4) {
            Intent int1 = new Intent(getApplicationContext(), Assessment.class);
            startActivity(int1);
        } }
    }
}