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Android comes with a Hierarchy Viewer tool, designed to help you visualize your layouts as they are seen in a running activity in a running emulator. For example, you can determine how much space a certain widget is taking up, or try to find where a widget is hiding that does not appear on the screen. To use the Hierarchy Viewer, you first need to fire up your emulator, install your application, launch your activity, and navigate to the spot you wish to examine. As you can see from Figure 37-1, for illustration purposes, we ll use the ReadWrite demo application we introduced back in 18. You can launch the Hierarchy Viewer via the hierarchyviewer program, found in the tools/ directory in your Android SDK installation. This brings up the main Hierarchy Viewer window shown in Figure 37-2.

The following are several disadvantages: Extensive infrastructure required (including many servers, database servers, redundant networks, and power connections) Software licensing required Expensive to maintain Employees with specific skills and knowledge required Regularly scheduled upgrades and security maintenance Potential of many hours spent to maintain By simply comparing the advantages and disadvantages, it is quite evident that hosting an application in-house is not in everyone s best interest. However, you cannot arrive at this decision by simply looking at these issues. Every company and client you deal with will be different in size and ability; therefore, you will need to analyze every situation for its own unique capabilities. Larger clients and corporations will often already have an infrastructure set up that the e-commerce application can fit into nicely. However, for this book, you will be dealing with a small company (you ll find out details about the company in the next chapter), which will not have such an extensive infrastructure. Given this information, outsourcing the hosting is the best decision; I will discuss this in more detail in the next section.

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@Override public void onCreate() { super.onCreate(); client=new DefaultHttpClient(); format=getString(R.string.url); mgr=(LocationManager)getSystemService(Context.LOCATION_SERVICE); mgr.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10000, 10000.0f, onLocationChange); }

Int Int EndUser String DateTime Address Int Decimal OrderDetails Decimal Decimal Decimal CreditCard DateTime String

The list on the left shows the various emulators you have opened. The number after the hyphen should line up with the number in parentheses in your emulator s title bar. Clicking on an emulator shows, on the right, the list of windows available for examination as you can see in Figure 37-3.

First, we chain upward to the superclass, so Android can do any setup work it needs to have done. Then we initialize our HttpClient component and format string as we did in the Weather demo. We then get the LocationManager instance for our application and request to get updates as our location changes, via the GPS LocationProvider, which will be discussed in greater detail in 32. The onDestroy() method is much simpler:

_orderid _enduserid _enduser _transactionid _orderdate _shippingaddress _orderstatusid _shippingtotal _orderdetails _subtotal _ordertotal _tax _creditcard _shipdate _trackingnumber

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@Override public void onDestroy() { super.onDestroy(); mgr.removeUpdates(onLocationChange); }

Figure 37-3. Hierarchy Viewer list of available windows Note how there are many other windows besides our open activity, including the Launcher (i.e., the home screen), the Keyguard (i.e., the Press Menu to Unlock black screen you get when first opening the emulator), and so on. Your activity will be identified by application package and class (e.g., com.commonsware.android.files/...). Where things get interesting, though, is when you choose a window and click Load View Hierarchy. After a few seconds, the details spring into view, in a perspective called the Layout View (see Figure 37-4).

In this section, I will give you detailed instructions for adding the common classes to your overall source code within the Visual Studio 2005 solution file and projects. Keep the following in mind: the common classes will not provide any functionality or methodology. The classes will merely contain a series of properties, which will encapsulate the most common objects you will be able to utilize throughout the system. The following exercise shows how to add the common classes to your existing source code that you previously organized within the Visual Studio 2005 solution.

Here, we just shut down the location-monitoring logic, in addition to chaining upward to the superclass for any Android internal bookkeeping that might be needed. In addition to those life-cycle methods, your service also needs to implement onBind(). This method returns an IBinder, which is the linchpin behind the IPC mechanism. We will examine onBind() a bit more closely in the next section.

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