How to update Listview item position when i updating lisview

How to update Listview item position when i updating lisview

I creating dialog and into dialog given a list of items.and also on dialog
i have added search functionality.when i clicking on items its get correct
item position but when i search list its not updated with data items
rather i cant retrieve exactly clickable items. Following is my Code.
public void uploadFromDirve(View vi) {
EditText et;
//setContentView(R.layout.list_dialog);
// TODO Auto-generated method stub
listDialog = new Dialog(Project_Define_Activity.this);
listDialog.setTitle("Select Item");
LayoutInflater li = (LayoutInflater)
Project_Define_Activity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = li.inflate(R.layout.list_dialog, null, false);
listDialog.setContentView(v);
listDialog.setCancelable(true);
//there are a lot of <span id="IL_AD7" class="IL_AD">settings</span>,
for dialog, <span id="IL_AD1" class="IL_AD">check</span> them all out!
ListView list1 = (ListView) listDialog.findViewById(R.id.listview);
adapter=new
ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,names);
list1.setAdapter(adapter);
et=(EditText)listDialog.findViewById(R.id.edit_Search);
et.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int
arg3) {
// When user changed the Text
Project_Define_Activity.this.adapter.getFilter().filter(cs);
adapter.notifyDataSetChanged();
}
@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
}
});
//list1.setAdapter(new
ArrayAdapter<String>(Project_Define_Activity.this,android.R.layout.simple_list_item_1,names));
//now that the dialog is set up, it's time to <span id="IL_AD2"
class="IL_AD">show</span> it
list1.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> adapter, View arg1, final
int arg2,
long arg3) {
// TODO Auto-generated method stub
AlertDialog.Builder builder = new
AlertDialog.Builder(Project_Define_Activity.this);
builder.setMessage("Attach file "+arg2)
.setPositiveButton("Attach ", new
DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
System.out.println("OK CLICKED");
Log.e("Selected", names.get(arg2));
fileflag = 1;
fileindex = arg2;
listDialog.cancel();
nameOfFile.setText(names.get(arg2));
}
});
builder.setNegativeButton("cancel", new
DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.dismiss();
listDialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.setTitle("Information");
alert.show();
}
});
listDialog.show();
}