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Figure 13-6. The complete implementation from the IDE You can see that the Invoke() method has been added to the ProcessGetProducts class for you. To have the code compile at this point, you need to have the Invoke() method return a true or false value. In the next exercise, I will explain in detail how to implement whether the value being returned is true or false. Finally, Visual Studio has added some filler code that you can keep or discard. This includes the region section added named IBusinessLogic Members and an exception within the method that throws a new exception saying there is nothing implemented yet. It is up to you whether you keep the region, but you will eventually be implementing the Invoke() method for the class, so you ll delete the exception later.

Android devices can have access to several different means of determining your location. Some will have better accuracy than others. Some may be free, while others may have a cost associated with them. Some may be able to tell you more than just your current position, such as your elevation over sea level or your current speed.

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You have learned how the business logic layer will work for the overall architecture and system. All the classes within the business logic layer will implement the IBusinessLogic interface, and thus the class will be required to implement the Invoke method to initiate the communication from this section of the architecture to the data access layer and eventually return the information to the presentation layer. In the next section of the chapter, I will take everything a step further and demonstrate how the business logic layer will communicate with the data access layer along with the common objects so you can gain a better understanding of how all the pieces will work together.

Android has abstracted all this out into a set of LocationProvider objects. Your Android environment will have zero or more LocationProvider instances: one for each distinct locating service that is available on the device. Providers know not only your location, but also are aware of their own characteristics, in terms of accuracy, cost, and so on. You, as a developer, will use a LocationManager, which holds the LocationProvider set, to figure out which LocationProvider is right for your particular circumstance. You will also need a permission in your application, or the various location APIs will fail due to a security violation. Depending on which location providers you wish to use, you may need ACCESS_COARSE_LOCATION, ACCESS_FINE_LOCATION, or both. (Permissions are discussed in 28.)

String[] items={"this", "is", "a", "really", "silly", "list"}; new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, items); The ArrayAdapter constructor takes three parameters: The Context to use (typically this will be your activity instance) The resource ID of a view to use (such as a built-in system resource ID, as previously shown) The actual array or list of items to show By default, the ArrayAdapter will invoke toString() on the objects in the list and wrap each of those strings in the view designated by the supplied resource. android.R.layout.simple_ list_item_1 simply turns those strings into TextView objects. Those TextView widgets, in turn, will be shown the list or spinner or whatever widget uses this ArrayAdapter. You can subclass ArrayAdapter and override getView() to roll your own views: public View getView(int position, View convertView, ViewGroup parent) { if (convertView==null) { convertView=new TextView(this); } convertView.setText(buildStringFor(position)); return(convertView); } Here, getView() receives three parameters: The index of the item in the array to show in the view An existing view to update with the data for this position (if one already existed, such as from scrolling if null, you need to instantiate your own) The widget that will contain this view, if needed for instantiating the view In the previous example, the adapter still returns a TextView, but uses a different behavior for determining the string that goes in the view. 9 will cover fancier ListViews.

Now that you have completed the initial piece of the business logic layer with the IBusinessLogic interface, I will demonstrate how a class from the business logic layer will interact with the data access portion of the architecture. You first need to revisit the data access layer and class library project to add the necessary classes to process your requested data. Therefore, in the following exercise, you ll implement the business logic layer with the data access layer.

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