I need to filter my customized listview as per the user input

public class ambulanceActivity extends Activity{
	
	dbhelper db4;
	//SimpleAdapter adapter;
	ListView lstview_Items;
   // public static String ambplace,ambname;
    int images =  R.drawable.call;
    final ArrayList<string> mArrayList = new ArrayList<string>();
    final ArrayList<string> mArrayList1 = new ArrayList<string>();
	public void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);  
		setContentView(R.layout.ambulance_list);
		EditText inputSearch=(EditText) findViewById(R.id.inputSearch);
		lstview_Items=(ListView) findViewById(R.id.listView1);
		db4 = new dbhelper(getApplicationContext());
		db4.creteDB();
		Cursor checkerA = db4.getDetails();
        checkerA.moveToFirst();
		while (!checkerA.isAfterLast()) {
			mArrayList.add(checkerA.getString(checkerA
					.getColumnIndex("ambname")));
			mArrayList1.add(checkerA.getString(checkerA
					.getColumnIndex("ambnum")));
			checkerA.moveToNext();
		}
		checkerA.close();
        final CustomAdapter adapter=new CustomAdapter(this,mArrayList,images,mArrayList1);
        lstview_Items.setAdapter(adapter);
        lstview_Items.setTextFilterEnabled(true);
	/*    lstview_Items.setOnItemClickListener(new OnItemClickListener() {
			public void onItemClick(AdapterView					int position, long arg3) {
				// TODO Auto-generated method stub

			*//*	Object o = mArrayList.get(position);
				Object p = mArrayList1.get(position);
				ambname = o.toString();
				ambplace = p.toString();
				flag=position;*//*
    			 Toast.makeText(ambulanceActivity.this, "You Clicked at "+position, Toast.LENGTH_SHORT).show();
			}
		});*/
        inputSearch.addTextChangedListener(new TextWatcher() {

			@Override
			public void onTextChanged(CharSequence cs, int arg1, int arg2,
					int arg3) {
				// When user changed the Text
             adapter.getFilter().filter(cs);
			}

			@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
			}
		});
    }
}

class CustomAdapter extends ArrayAdapter <string>
{
Context context;
    int images;
    ArrayList<string> names;
    ArrayList<string> number;
      CustomAdapter(Context c, ArrayList<string> mArrayList,int imgs, ArrayList<string> num) {
        super(c, R.layout.list_entry,R.id.contact,mArrayList);
          this.context=c;
          this.images=imgs;
          this.names=mArrayList;
          this.number=num;
    }
    class  MyViewHolder extends Activity
    {
        ImageView myImage;
        TextView myContactName;
        TextView myContactNumber;

        MyViewHolder(View v)
        {
            myImage=(ImageView) v.findViewById(R.id.police);
            myContactName=(TextView) v.findViewById(R.id.name);
            myContactNumber=(TextView) v.findViewById(R.id.contact);

        }
    }
    public View getView(final int position, View convertView, ViewGroup parent) {
        View row = convertView;
        MyViewHolder holder=null;
        if (row == null){
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
         row = inflater.inflate(R.layout.list_entry, parent, false);
            holder=new MyViewHolder(row);
            row.setTag(holder);
       }
        else
        {
            holder=(MyViewHolder) row.getTag();
        }
       ImageView call=(ImageView) row.findViewById(R.id.police);
        call.setTag(position);
        call.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
               Intent intent=new Intent("android.intent.action.CALL");
                Uri data = Uri.parse("tel:"+number.get(position).toString());
                intent.setData(data);
                context.startActivity(intent);
            }
        });
        TextView contact=(TextView) row.findViewById(R.id.contact);
        holder.myImage.setImageResource(images);
        holder.myContactName.setText(names.get(position));
        holder.myContactNumber.setText(number.get(position));
        return row;
    }
}