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Figure 7-5. Account Registration activity diagram When the user finds out they need to register a new account, they will see a standard form-field web page for entering all the necessary user contact information. Within this particular information, the system will ask the user to agree to the terms of service. In addition, since the wine business is unique, you will ask the user to agree to have their age verified by a third-party verification service. An important aspect for a new user registering an account will be that they agree to this verification. Basically, if a customer does not agree to have their age information verified or if they agree but then the verification fails they will not be able to proceed with registering an account with the vineyard. The Account Registration activity diagram has brought you to the end of the activity diagrams. You ll now get a macro view of the system by studying and developing some use cases.

Every programming language or environment book starts off with the popular Hello, World! demonstration. This is just enough of a program to prove you can build things. However, the typical Hello, World! program has no interactivity (e.g., it just dumps the words to a console), and so it s really boring. This chapter demonstrates a simple project, but one using Advanced Push-Button Technology and the current time, making it a bit more interesting than the typical Hello, World! demo.

You also need to add a public static member . . . somewhere, containing the Uri for each collection your content provider supports. Typically this is a public static final Uri put on the contentprovider class itself: public static final Uri CONTENT_URI= Uri.parse("content://com.commonsware.android.tourit.Provider/tours"); You may wish to use the same namespace for the content Uri that you use for your Java classes, to reduce the chance of collision with others.

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The use cases you will be designing and using for the purposes in this chapter will be slightly different from the activity diagrams. More specifically, the use cases will show a macro-level view of the system and how users will interact with it. Before getting ahead of myself, I ll first discuss some basics of what exactly use cases are and how you ll use them for the Little Italy Vineyards case study.

As described in the previous chapter, to work with anything in Android, you need a project. If you are using tools that are not Android-enabled, you can use the android create project script, found in the tools/ directory in your SDK installation. You will need to pass to android create project the API target, the directory where you want the skeleton generated, the name of the default activity, and the Java package where all of this should reside:

Use cases are typically diagrams that outline the usage requirements for the system. They are helpful in that they show a high-level view in which different elements of the system interact. Contained within a use case are several elements: Actors: Represent a person, organization, entity, or external component of the system and are drawn as stick figures Associations: Represent situations that are present when an actor is involved with a use case System boundaries: Provide a specific scope of the use case Packages: Aid in organizing the use cases into specific groups Figure 7-6 shows the use cases for the Little Italy Vineyards case study.

android create project --target 2 \ --path /path/to/my/project/dir --activity Now \ --package com.commonsware.android.Now

Remember those properties you referenced when you were using a content provider in the previous chapter Well, you need to have those too for your own content provider. Specifically, you want a public static class implementing BaseColumns that contains your property names, such as this example from Provider: public static final class Constants implements BaseColumns { public static final Uri CONTENT_URI =Uri.parse("content://com.commonsware.android.constants.Provider/constants"); public static final String DEFAULT_SORT_ORDER="title"; public static final String TITLE="title"; public static final String VALUE="value"; } If you are using SQLite as a data store, the values for the property name constants should be the corresponding column name in the table, so you can just pass the projection (array of properties) to SQLite on a query(), or pass the ContentValues on an insert() or update(). Note that nothing in here stipulates the types of the properties. They could be strings, integers, or whatever. The biggest limitation is what a Cursor can provide access to via its property getters. The fact that there is nothing in code that enforces type safety means you should document the property types well so people attempting to use your content provider know what they can expect.

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