Android Tutorial

Android Tutorial 341

The delete() method deletes all rows at a given URI filtered by the

selection parameters, which, in this case, includes all rows at the

People.CONTENT_URI location; in other words, all contact entries.

Deleting Specific Records

Often you want to select specific rows to delete by adding the

unique identifier index to the end of the URI or remove rows

matching a particular pattern.

For example, the following deletion matches all contact records

with the name Sample User, which we used when we created

sample contacts previously in the chapter.

int rows = getContentResolver().delete(People.CONTENT_URI,
People.NAME + “=?”, new String[] {“Sample User”});
Log.d(debugTag, “Rows: “+ rows);

Enhancing Applications Using Content Providers

The concept of a content provider is complex and best understood

by working through an example. The Pet Tracker series of

applications from the previous chapter are nice and all, but the

application could really use some graphics. Wouldn’t it be great if

we could include photos for each pet record? Well, let’s do it!

There’s only one catch: We need to access pictures provided

through another application on the Android system—the Media

Store application.

In Figure, you can see the results of extending the previous Pet

Tracking projects using the Media Store content provider.