Add a GridView to a ListView in Android

I'm trying to create a ListView that will consist of two types of elements: Strings and a GridView.
I.e. putting both Strings and a GridView inside one single ListView.

The layout should look something like this:

• String Item 1.1
• String Item 1.2
• String Item 1.3
• String Item 1.4
• GridView Item 1 GridView Item 2
  GridView Item 3 GridView Item 4
• String Item 2.1
• String Item 2.2
• String Item 2.3
• String Item 2.4

Is there any way to do this?

As per now I can only show the first item in the GridView, and it acts just as a regular String element in the ListView.

The code can be viewed here:

• CustomListViewActivity.java
• SectionAdapter.java
• main.xml
• header_row.xml
• simple_list_row.xml
• grid_list_row.xml

Any help is appreciated :)