Dialog Position

private CharSequence[] items = {"Set as Ringtone", "Set as Alarm"};
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setItems(items, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int item) {

            if(item == 0) {

            } else if(item == 1) {

            } else if(item == 2) {

            }
        }
    });

     AlertDialog dialog = builder.create();
     dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
     WindowManager.LayoutParams wmlp = dialog.getWindow().getAttributes();

 wmlp.gravity = Gravity.TOP | Gravity.LEFT;
 wmlp.x = 100;   //x position
 wmlp.y = 100;   //y position

 dialog.show();