Get listview item position on button click

This is my listview click event:

 lv1.setOnItemClickListener(new OnItemClickListener() {
       @Override
            public void onItemClick(AdapterView<?> a, View v, int position, long id) { 
                Object o = lv1.getItemAtPosition(position);
                ItemDetails obj_itemDetails = (ItemDetails)o;
                Toast.makeText(ListViewImagesActivity.this, "You have chosen : " + " " + obj_itemDetails.getName(), Toast.LENGTH_LONG).show();

        }  
 });

And this is my button click event:

btnNxt = (Button) findViewById(R.id.btnNext);
 btnNxt.setOnClickListener(new OnClickListener() {
 @Override
 public void onClick(View arg0) {
  //Here I need to get that position
});

Now I need to get the position of the clicked listview item..I have declared postion globally but that always gives me position 1.

Can anyone say me how do I get the positon ?

do you execute this

    btnNxt = (Button) findViewById(R.id.btnNext);
 btnNxt.setOnClickListener(new OnClickListener() {
 @Override
 public void onClick(View arg0) {
  //Here I need to get that position
});

inside the getView method? if so it's very easy

     btnNxt = (Button) findViewById(R.id.btnNext);
     btnNxt.setTag(position);
     btnNxt.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View arg0) {
      int position=(Integer)arg0.getTag();
    });

I know I'm bit late with the answer, but what about this:

private OnClickListener myButtonClickListener = new OnClickListener() {
@Override
public void onClick(View v) {
    View parentRow = (View) v.getParent();
    ListView listView = (ListView) parentRow.getParent();
    final int position = listView.getPositionForView(parentRow);
  }
};

in this case you don't need to set tags and so on.