use google drive api get children without trash

Question

How can I get a folder's children files without the deleted files in trash, my code as follow:

 Children children = service.children();
 Drive.Children.List request = children.list("root");
  do
  {
    try
       {
          ChildList cList = request.execute();
          for (ChildReference cr : cList.getItems())
           {
              File file = service.files().get(cr.getId())   .execute();
              System.out.println(file.getTitle() + "--"+ file.getMimeType());
           }
        request.setPageToken(cList.getNextPageToken());
       }
   catch (IOException e)
      {
          System.out.println("An error occurred: " + e);
          request.setPageToken(null);
      }
 } while (request.getPageToken() != null && request.getPageToken().length() > 0);

Answer 1

Use trashed = false query when listing:

drive.files().list().setQ("trashed = false").execute();

More querying options are on https://developers.google.com/drive/search-parameters

Answer 2

If you have a query with multiple conditions, like you want to get ROOT's files and folder, and also don't want to get the trashed files. Then below query will helpful "'root' in parents and trashed=false"

  request.setQ("'root' in parents and trashed=false").execute();