Android User Interface Development: Beginner's Guide by Jason Morris

By Jason Morris

It is a step by step advisor that goals to offer even a amateur Android developer a superb seize of user-interface layout, whereas operating via examples, diagrams, and screenshots to exhibit many of the widgets and instruments that the platform makes to be had.

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An Activity is started with an Intent object, and each Intent object may carry any amount of "extra" information (similar to request attributes in the HttpServletRequest interface) for the Activity to use, sort of like arguments to a main method. So, an Intent is also like a HashMap, containing special data for the Activity to use. Question", 0); } [ 30 ] Chapter 1 These two methods form the basis for populating our question screen and navigating our way through a defined list of questions. Question", 0); } What just happened The getQuestionID method is pretty straight forward.

The most important method for us in the BurgerAdapter is the getView method. This is where the ListView will ask us for a View object to represent each list item it needs to display: public View getView(int index, View reuse, ViewGroup parent) { 7. text); 8. We'll be populating these two TextView objects with the data from the Burger object at the requested index. count == 0 ? name); return item; What just happened? We just wrote a custom Adapter class to present an array of Burger objects to the user in a ListView.

The new Activity will also be responsible for listening to "touch" or "click" events on the items in the ListView. When the user touches one of the items, we need to update the model and ListView to reflect that the user has ordered another Burger. 1. Create a new class in the root package of your project named TheBurgerPlaceActivity, and make sure it extends ListActivity: public class TheBurgerPlaceActivity extends ListActivity { 2. onCreate method. 3. onCreate to allow normal Android startup.

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