Android Tutorial

By : Ketan Bhimani

346 

We can then save our Pet Record as we have before.

Displaying Images Retrieved from the SD Card Using URIs

Now that our Pet Entry form is saved properly, we must turn our

attention to the Pet Listing screen. Our ListView is getting more

complicated; each item needs to contain an ImageView and two

TextView widgets for the pet name and species. We begin by

defining a custom layout template for each ListView item called

pet_item.xml. This should be familiar; it contains an ImageView

and two TextView objects.

We want to make sure this implementation is scalable, in case we

want to add new features to individual ListView items in the future.

So instead of taking shortcuts and using standard adapters and

built-in Android layout templates, we implement another custom

adapter called PetListAdapter.

The PetListAdapter is similar to the ImageUriAdapter we previously

implemented for the Gallery widget. This time, instead of Gallery

child items, we work with the ListView child records, which

correspond to each pet. Again, the constructor maps the Cursor

data to an array of PetRecord objects.

The getView() method of the PetListAdapter is where the magic

occurs. Here we use a LayoutInflater to inflate our custom layout

file called pet_item.xml for each ListView item. Again we use the

Tag property of the view to store any information about the record

that we might use later. It is here that we use the URI information

we stored in our database to rebuild the fully qualified image URI

using the Uri.parse() and ContentUris.withAppendedId() utility

methods and assign this URI to the ImageView widget using the