A Dynamic Presentation

This technique – supplying an alternate layout to use for rows – handles simple cases very nicely. However, it isn’t sufficient when you have more‑complicated scenarios for your rows, such as the following:

• Not every row uses the same layout (e.g., some have one line of text, others have two).

• You need to configure the widgets in the rows (e.g., different icons for different cases).

In those cases, the better option is to create your own subclass of your desired , override , and construct your rows yourself. The method is responsible for returning a , representing the row for the supplied position in the adapter data.

For example, let’s rework the preceding code to use so we can have different icons for different rows – in this case, one icon for short words and one for long words (from the sample project at http://apress.com/):

Public class extends

Public onCreate

Super onCreate

SetContentView

SetListAdapter new IconicAdapter this

FindViewById

Public onListItemClick

SetText

Class extends

IconicAdapter

Super

This

Public getView

GetLayoutInflater

Inflate null

FindViewById

SetText

If length

FindViewById

SetImageResource

Return

The theory is that we override and return rows based on which object is being displayed, where the object is indicated by a position index into the . However, if you look at the implementation shown in the code here, you will see a reference to a class – and that concept takes a little bit of an explanation.