Public class extends. SetListAdapter new CheckAdapter this

Public onCreate

Super onCreate

SetContentView

New

For

Add new RowModel

SetListAdapter new CheckAdapter this

FindViewById

Private getModel

Return getListAdapter getItem

Public onListItemClick

SetText getModel toString

Class extends

CheckAdapter

Super

This

Public getView

If null

GetLayoutInflater

Inflate null

New ViewWrapper

SetTag

GetRatingBar

New OnRatingBarChangeListener

Public onRatingChanged

GetTag

GetModel

GetParent

FindViewById

SetText toString

SetOnRatingBarChangeListener

Else

GetTag

GetRatingBar

GetModel

GetLabel setText toString

SetTag new Integer

SetRating

Return

Class

RowModel

This

Public toString

If

Return toUpperCase

Return

Here is what is different between our earlier code and this activity and implementation:

• While we are still using items as the list of nonsense words, but rather than pouring that array straight into an , we turn it into a list of objects. is this demo’s poor excuse for a mutable model; it holds the nonsense word plus the current checked state. In a real system, these might be objects populated from a , and the properties would have more business meaning.

• Utility methods like had to be updated to reflect the change from a pure String to use a .

• The subclass () in looks to see if is null. If so, we create a new row by inflating a simple layout (see the following code) and also attach a (also in the following code). For the row’s , we add an anonymous listener that looks at the row’s tag () and converts that into an , representing the position within the that this row is displaying. Using that, the checkbox can get the actual for the row and update the model based upon the new state of the rating bar. It also updates the text adjacent to the when checked to match the rating‑bar state.

• We always make sure that the has the proper contents and has a tag (via ) pointing to the position in the adapter the row is displaying.

The row layout is very simple: just a and a inside a :

The is similarly simple, just extracting the and the out of the row :

Class

Null

Null