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Within these use cases, you can see that the system contains a few actors. The obvious actors are the customer, the verification service, and the credit card processing company or gateway. Each of the actors interacts with each other differently. You can see that the customer has the most use cases. However, when the customer happens to be a new user and needs to register for a new account, they will share a use case with the verification service to identify whether the customer is eligible to make purchases from the vineyard.

You can also download the project directories of the samples shown in this book in a ZIP file on the Apress web site. These projects are ready for use; you do not need to run android create project on those unpacked samples. Your project s src/ directory contains the standard Java-style tree of directories based on the Java package you used when you created the project (e.g., com.commonsware.android results in src/com/commonsware/android/). Inside the innermost directory, you should find a pregenerated source file named Now.java, which is where your first activity will go.

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In this section, you ll model the common objects used with the e-commerce system. These are, of course, individual classes and are certainly not going to be the only classes that the finalized system will contain. They will be the most common objects or classes that the system will use or be based upon. As a result of first identifying and then modeling these common objects, you will have your first blueprint of the database; you ll use this blueprint to design from in the following chapter. Table 7-2 lists the common classes. Table 7-2. Common Objects

The glue tying the content-provider implementation to the rest of your application resides in your AndroidManifest.xml file. Simply add a <provider> element as a child of the <application> element: <provider android:name=".Provider" android:authorities="com.commonsware.android.tourit.Provider" /> The android:name property is the name of the content-provider class, with a leading dot to indicate it is in the stock namespace for this application s classes (just like you use with activities).

EndUser EndUserType Product ProductCategory Orders OrderDetails Address ContactInformation ShoppingCart CreditCard

This activity will contain a single button that displays the time that the button was last pushed (or the time the application was started if the button has not been pushed). NOTE: If you downloaded the source files from the Apress web site, you can just use the Skeleton/Now project directly, rather than entering the code. Open Now.java in your editor and paste in the following code:

Describes all users within the system Describes the classification of the users and their associations Describes what is being sold Describes the categories in which products can be classified Contains the information about what the customer purchase Contains the details about an individual order Contains address information for any other related object Contains contact information for any other related object Contains the information about the products the customer chooses to purchase Contains the information for payment

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 android:authorities property should be a semicolon-delimited list of the authority values supported by the content provider. Recall, from earlier in this chapter, that each content Uri is made up of a scheme, an authority, a data type path, and an instance identifier. Each authority from each CONTENT_URI value should be included in the android:authorities list. Now when Android encounters a content Uri, it can sift through the providers registered through manifests to find a matching authority. That tells Android which application and class implements the content provider, and from there Android can bridge between the calling activity and the content provider being called.

From each of these common classes, I will provide a class diagram that will depict each of the attributes and properties within the class. These classes will not have any methods or functions because they are simply objects that will contain detailed information about the overall system objects. Let s now explore the classes.

public class Now extends Activity implements View.OnClickListener { Button btn; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); btn=new Button(this); btn.setOnClickListener(this); updateTime(); setContentView(btn); } public void onClick(View view) { updateTime(); } private void updateTime() { btn.setText(new Date().toString()); } }

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