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As shown in Figure 2 5, enter HelloAndroid as the project name, HelloAndroidApp as the application name, com.androidbook as the package name, and HelloActivity as the Create Activity name. Note that for a real application, you ll want to use a meaningful application name because it will appear in the application s title bar. Also note that the default location for the project will be derived from the Eclipse workspace location. In this case, your Eclipse workspace is c:\android, and the New Project Wizard appends the name of the new application to the workspace location to come up with c:\android\HelloAndroid\. Finally, the Min SDK Version value of 4 tells Android that your application requires Android 1.6 or newer. Click the Finish button, which tells ADT to generate the project skeleton for you. For now, open the HelloActivity.java file under the src folder and modify the onCreate() method as follows:

Note The noteworthy aspect of UI programming in Android is that you are programming in a modern UI

/** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); /** create a TextView and write Hello World! */ TextView tv = new TextView(this); tv.setText("Hello World!"); /** set the content view to the TextView */ setContentView(tv); }

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This diamond-shaped inheritance diagram is sometimes referred to as the dreaded diamond. It is so named because of the problem the compiler warns you about when you compile the class: Warning V: this definition of an instance variable isactive hides a previously defined instance variable of the same name. The new class has two copies of the isactive value. It has two copies of several values, too, and the compiler will tell you about all of them. But which copy is the correct one Is it the one from the trader class or the one from the researcher class OCaml solves this problem by picking the last one. You can also use the superclass to explicitly manipulate both copies, but that can lead to serious confusion later. Although not always practical, you should use only pure virtual classes when you use multiple inheritance. That way, you cannot hide variables. As long as you are aware of this functionality, the diamond does not need to be dreaded.

Eclipse should automatically add an import statement for android.widget.TextView. You might need to click the + sign next to the first import statement to see them all. If the import statement doesn t get added automatically, be sure to add it yourself. Save the HelloActivity.java file. To run the application, you ll need to create an Eclipse launch configuration, and you ll need a virtual device on which to run. We re going to quickly take you through these steps and come back later to more details about Android Virtual Devices (AVDs). Create the Eclipse launch configuration by following these steps: 1. 2. Select Run Run Configurations. In the Run Configurations dialog box, double-click Android Application in the left pane. The wizard will insert a new configuration named New Configuration. Rename the configuration RunHelloWorld. Click the Browse button and select the HelloAndroid project. Under Launch Action, select Launch and select com.androidbook.HelloActivity from the drop-down list. The dialog should appear as shown in Figure 2 6.

Programming in the Android UI involves declaring the interface in XML files. You will then load these XML view definitions as windows in your UI application. Even menus in your application are loaded from XML files. Screens or windows in Android are often referred to as activities, which comprise multiple views that a user needs in order to accomplish a logical unit of action. Views are Android s basic UI building blocks, and you can further combine them to form composite views called view groups. Views internally use the familiar concepts of canvases, painting, and user interaction. An activity hosting these composite views, which include views and view groups, is the logical replaceable UI component in Android. One of the Android framework s key concepts is the lifecycle management of activity windows. Protocols are put in place so that Android can manage state as users hide, restore, stop, and close activity windows. You will get a feel for these basic ideas in 2, along with an introduction to setting up the Android development environment.

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