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The EndUser class will contain all the information for any type of user who interacts with the e-commerce system. This user could be a customer or even an administrator. The distinction between the roles of the different users will be identified with the EndUserTypeID property, which will be explained in more detail in the EndUserType section. Lastly, the EndUser class will contain the first name, last name, address ID, and contact information ID from the

The package declaration needs to be the same as the one you used when creating the project. And, as with any other Java project, you need to import any classes you reference. Most of the Android-specific classes are in the android package.

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An optional feature your content provider offers its clients is notify-on-change support. This means that your content provider will let clients know if the data for a given content Uri changes. For example, suppose you have created a content provider that retrieves RSS and Atom feeds from the Internet based on the user s feed subscriptions (via OPML, perhaps). The content provider offers read-only access to the contents of the feeds, with an eye toward several applications on the phone using those feeds versus everyone implementing their own feed-pollfetch-and-cache system. You have also implemented a service that will get updates to those feeds asynchronously, updating the underlying data store. Your content provider could alert applications using the feeds that such-and-so feed was updated, so applications using that specific feed could refresh and get the latest data. On the content-provider side, to do this call notifyChange() on your ContentResolver instance (available in your content provider via getContext().getContentResolver()). This takes two parameters: the Uri of the piece of content that changed, and the ContentObserver that initiated the change. In many cases, the latter will be null; a non-null value simply means the observer that initiated the change will not be notified of its own changes. On the content-consumer side, an activity can call registerContentObserver() on its ContentResolver (via getContentResolver()). This ties a ContentObserver instance to a supplied Uri the observer will be notified whenever notifyChange() is called for that specific Uri. When the consumer is done with the Uri, unregisterContentObserver() releases the connection.

ContactInformationID class, which will also be discussed later in this chapter. Figure 7-7 shows the class diagram of the EndUser class.

package com.commonsware.android.skeleton; import import import import import android.app.Activity; android.os.Bundle; android.view.View; android.widget.Button; java.util.Date;

The EndUserType class will be fairly brief. It will contain only two separate properties within the class. This class will serve as a lookup class for identifying and associating different types of users and their respective roles or classifications. The EndUserTypeID property will have a unique ID, which is then subsequently associated with a unique name for that ID. This will be located under the Name property, as shown in Figure 7-8.

n the late 1990s a wave of viruses spread through the Internet, delivered via email, using contact information culled from Microsoft Outlook. A virus would simply email copies of itself to each of the Outlook contacts that had an email address. This was possible because, at the time, Outlook did not take any steps to protect data from programs using the Outlook API, since that API was designed for ordinary developers, not virus authors. Nowadays, many applications that hold onto contact data secure that data by requiring that a user explicitly grant rights for other programs to access the contact information. Those rights could be granted on a case-by-case basis or once at install time. Android is no different, in that it requires permissions for applications to read or write contact data. Android s permission system is useful well beyond contact data, and for content providers and services beyond those supplied by the Android framework. You, as an Android developer, will frequently need to ensure your applications have the appropriate permissions to do what you want to do with other applications data. You may also elect to require permissions for other applications to use your data or services, if you make those available to other Android components. This chapter covers how to accomplish both these ends.

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