What's Your Preference?
This sets up a single-item PreferenceScreen. Note that it references two
string arrays, one for the display labels of the sort-order selection list, and
one for the values actually stored in the SharedPreferences.
So, to define those string arrays, add a LunchList/res/values/arrays.xml file
with the following content:



By Name, Ascending
By Name, Descending
By Type
By Address, Ascending
By Address, Descending


name ASC
name DESC
type, name ASC
address ASC
address DESC


Note we are saying that the value stored in the SharedPreferences will
actually be an ORDER BY clause for use in our SQL query. This is a convenient
trick, though it does tend to make the system a bit more fragile – if we
change our column names, we might have to change our preferences to
match and deal with older invalid preference values.
Step #2: Create the Preference Activity
Next, we need to create a PreferenceActivity that will actually use these
preferences. To do this, add a PreferenceActivity implementation, stored as
LunchList/src/apt/tutorial/EditPreferences.java:
package apt.tutorial;
import android.app.Activity;
import android.os.Bundle;
import android.preference.PreferenceActivity;
public class EditPreferences extends PreferenceActivity {
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