title: id of selected item from contextMenu is always 0
body: <p>I can't get this to work, I have looked through many posts and I really am desperate since I have to finish this until the day after tomorrow. The problem is the following:</p>
  
  <p>I have a listView with entries from a database. It is possible to do a long click on them to call a contextMenu. In the context menu I can either delete or edit the entry, and to do that I need the id of the selected item. </p>
  
  <pre><code>@Override
  public void onCreateContextMenu(ContextMenu menu, View v,
                                  ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    MenuInflater inflater2 = getMenuInflater();
    inflater2.inflate(R.menu.edit_grade_menu, menu);
  }
  
  @Override
  public boolean onContextItemSelected(MenuItem item) {
    AdapterContextMenuInfo info =  (AdapterContextMenuInfo) item.getMenuInfo();
    int id = (int) info.id;
    switch (item.getItemId()) {
    case R.id.edit_grade:
      Intent i = new Intent(this, AddGradeActivity.class);
      i.putExtra(GradesDbAdapter.KEY_ROWID, linkSubject);
  
      // putExtra edit, so addGradeActivity knows it has to fill views with values to edit grade
      i.putExtra("edit", true);
      i.putExtra(GradesDbAdapter.KEY_GRADE, id);
      this.startActivity(i);
      finish();
  
      return true;
    case R.id.del_grade:
        myDbHelper.deleteGradeEntry(id, semester);
        // filldata to refresh listview
        fillData();
      return true;
    default:
      return super.onContextItemSelected(item);
    }
  }
  </code></pre>
  
  <p>Now my problem is that this id that I get from info always is 0. It's really weird since it has worked before I changed the layout, I have this same activity running in 2 tabs on the same screen. Could this be the reason?</p>