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represents a general-purpose View object. The common controls in Android ultimately extend the View class. ViewGroup is also a view, but contains other views too. ViewGroup is the base class for a list of layout classes. Android, like Swing, uses the concept of layouts to manage how controls are laid out within a container view. Using layouts, as we ll see, makes it easy for us to control the position and orientation of the controls in our user interfaces. You can choose from several approaches to build user interfaces in Android. You can construct user interfaces entirely in code. You can also define user interfaces in XML. You can even combine the two define the user interface in XML and then refer to it, and modify it, in code. To demonstrate this, we are going to build a simple user interface using each of these three approaches. Before we get started, let s define some nomenclature. In this book and other Android literature, you will find the terms view, control, widget, container, and layout in discussions regarding UI development. If you are new to Android programming or UI development in general, you might not be familiar with these terms. We ll briefly describe them before we get started (see Table 4 1).

When we call the bindService() method, we pass in the reference to this member When the connection to the service is established, we obtain a reference to the IStockQuoteService using the Stub and then call the getQuote() method Note that the bindService() call is an asynchronous call It is asynchronous because the process or service might not be running and thus might have to be created or started Because bindService() is asynchronous, the platform provides the ServiceConnection callback so we know when the service has been started and when the service is no longer available Now you know how to create and consume an AIDL interface Before we move on and complicate matters further, let s review what it takes to build a simple local service vs an AIDL service A local service is a service that does not support onBind() it returns null from onBind().

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Each of these represents a user interface element. Examples include a button, a grid, a list, a window, a dialog box, and so on. The terms view, widget, and control are used interchangeably in this chapter. This is a view used to contain other views. For example, a grid can be considered a container because it contains cells, each of which is a view. This is an XML file used to describe a view.

Figure 4 1 shows a screenshot of the application that we are going to build. Next to the screenshot is the layout hierarchy of the controls and containers in the application.

You can find them at http://www.cs.chalmers.se/~rjmh/Papers/whyfp.html. Graham even credits his ability to produce Viaweb (a product later sold to Yahoo) with the flexibility, modularity, and overall goodness provided by the functional language he used (which is Lisp). The modularity of functional languages can be achieved in structured languages, but it is often achieved via policy rather than being enforced by the language. This difference can be very important in terms of maintenance, especially when the maintenance is not done by the original author. Functional languages are also often easier to analyze programmatically. In many functional programming languages, a given function can have only one entry point and one exit point. OCaml, for example, allows only one entry point and one exit point. This language-level enforcement of Single Entry, Single Exit simplifies creating tools for analyzing the code. Programmatic validation of code is a topic that is gaining a lot of interest in the programming world, especially regarding the creation of more robust systems. Sometimes, OCaml programmers decry the absence of a return statement in OCaml as a Bad Thing. One of the important things to remember is that mathematical functions do not have multiple points of exit. This kind of conditional result requires two functions, each applied in the domain of the problem. The lack of multiple points of exit results in smaller, more numerous functions each with a given output on each given input. In turn, these smaller components are less complicated, and (theoretically) easier to debug.

We will refer to this layout hierarchy as we discuss the sample programs. For now, know that the application has one activity. The user interface for the activity is composed of three containers: a container that contains a person s name, a container that contains the address, and an outer parent container for the child containers.

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