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The package name adheres to the standard Java package-naming guidelines, which were established to lower the risk of two packages being released with the same name The top level of the package name is the domain identifier of the company (com, org, and net are examples) This is followed by the domain name, such as google Finally, a descriptive title for the contents of the package is provided For purposes of this chapter, my package name for the Hello World! application will omit com to identify that it is a text application and not meant to be published All future packages created in this book will be publishable and use the com identifier
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For the HelloWorldText application, use the package name android_programmers_ guideHelloWorldText This name uniquely identifies the code that belongs to this application and differentiates this test application from others you will develop in this book
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If you are paying attention to the screen as you are typing, you will notice that an error message appears at the top of the wizard as you enter the package name, stating that you must fill out all the fields properly to continue This error message is premature and can be a bit confusing because you have not even attempted to fill out the other fields in the Properties area If you see such an error message, just ignore it and continue on and complete the next two fields in Properties area
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Application: Hello World!
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The next Properties field, Activity Name, is required because it is the reference to the main screen of your application That is, think of the Activity as the window within which your application is displayed Without an Activity, your application would not do very much However, because Android applications can be composed of several Activities, the New Android Project wizard needs to know which Activity will be the default Activity Name is a required field and has no default, so you must supply one to continue (as indicated in the preceding caution) For purposes of this example, use HelloWorldText This keeps the application simple and is just about as descriptive as it needs to be for the moment The final Properties field, Application Name, specifies the name of your application This is the name that will be used to manage your application when it is installed on the device Again, for the sake of keeping things simple, go with HelloWorldText as the application name The following illustration shows the completed New Android Project wizard
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The Application Name and the Activity Name fields do not have to match In fact, many programmers are used to the older conventions whereby the starting screen of an application is usually called Main or Startup Use whatever conventions you are comfortable with For purposes of demonstration, this chapter assumes that you are using the names suggested
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Click Finish to kick off the creation process The wizard runs a background process that facilitates the auto-generation of some required files, and the setup of the directory structure needed to support an Android application When the process is complete, you will have your first Android application project, like that shown in Figure 5-2
Figure 5-2 Your first Android application project
5:
Application: Hello World!
If the Finish button is not available to you, you may have made an error in one of the fields in the Properties area To ensure that the Properties fields are correctly filled in, Eclipse will not allow you to finish the process if any of the information that you entered may cause problems Go back and make sure that all of the Properties fields are correctly filled in
The next section examines the contents of the auto-generated Android files and the purpose of some of the shell items for your application
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