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Figure 11-7. Encapsulate Field dialog box 6. In the Encapsulate Field dialog box, you can see that the field name that was selected was the _endusertypeid field and the next item to address is the actual property name. At this point, change the name of the property to EndUserTypeID to reflect camel-casing naming conventions. Notice the other options in the Encapsulate Field dialog box. You won t use any of the other options, but they give you the ability to search within the comments and within any string values you might have created in the code. Lastly, another option offers the ability to preview all your changes before the code is committed. When finished, click the OK button, and you will see the following code: using System; using System.Collections.Generic; using System.Text; namespace LittleItalyVineyard.Common { public class EndUserType { private int _endusertypeid; public int EndUserTypeID { get { return _endusertypeid; } set { _endusertypeid = value; } } public EndUserType() { } } }

Rather than use adb logcat, DDMS lets you view your logging information in a scrollable table. Just highlight the emulator or device you want to monitor, and the bottom half of the screen shows the logs (see Figure 37-9). In addition, you can: Filter the Log tab by any of the five logging levels, shown as the V through E toolbar buttons. Create a custom filter, so you can view only those tagged with your application s tag, by pressing the + toolbar button and completing the form. The name you enter in the form will be used as the name of another logging output tab in the bottom portion of the DDMS main window. Save the log information to a text file for later perusal, or for searching.

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The biggest catch is to make sure that the activity retracts the listeners when it is done. Listener objects generally know their activity, explicitly (via a data member) or implicitly (by being implemented as an inner class). If the service is holding onto defunct listener objects, the corresponding activities will linger in memory, even if the activities are no longer being used by Android. This represents a big memory leak. You may wish to use WeakReferences, SoftReferences, or similar constructs to ensure that if an activity is destroyed, any listeners it registers with your service will not keep that activity in memory.

7. You can see that the EndUserTypeID property was automatically created for you with only a few clicks as opposed to manually hand-coding the get and set items for the property. Continue to the remaining property of the EndUserType class the EndUserName property with its respective field, _endusername. The completed class will resemble the following code: using System; using System.Collections.Generic; using System.Text; namespace LittleItalyVineyard.Common { public class EndUserType { private int _endusertypeid; private string _endusername; public EndUserType() { } public int EndUserTypeID { get { return _endusertypeid; } set { _endusertypeid = value; } } public string EndUsername { get { return _endusername; } set { _endusername = value; } } } } Notice that the code was rearranged slightly to be consistent with the class design in that the field names are listed followed by the constructor and finally the individual properties. Continue using the refactoring functionality to create the remaining common object class files for the project that were specified in the previous tables. It will be quite apparent that this will save you time in your development.

Summary

An alternative approach, first mentioned in 17, is to have the service send a broadcast Intent that can be picked up by the activity assuming the activity is still around and is not paused. We will look at the client side of this exchange in 30. Here, let s examine how the service can send a broadcast. The high-level implementation of the flow is packaged in FetchForecastTask, an AsyncTask implementation that allows us to move the Internet access to a background thread:

While you can use adb pull and adb push to get files to and from an emulator or device, DDMS lets you do that visually. Just highlight the emulator or device you wish to work with, then choose Device File Explorer... from the main menu. That will bring up the typical directory browser seen in Figure 37-10.

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