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

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 some of the widgets and instruments that the platform makes to be had.

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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. getView. A View object will be created for each item in the ListView. However, when the data displayed by the ListView changes, the ListView will ask the ListAdapter to reuse each of the View objects it generated the first time around. It's important to try and honor this behavior, since it has a direct impact on the responsiveness of your application. In our preceding example, we implemented the getViewGroup method so that it would take this requirement into account.

You could also define your own measurement unit and base it on the screen size. Always think about how your user will interact with your application, and how much (or little) time they are likely to have with it. Keeping each screen simple and responsive keeps your users happy. Now that we've learned how to create a skeleton Android project, and a simple Activiy, we can focus on the more subtle problems and solutions of Android user interface design. In the next chapter, we will focus on working with data-driven widgets.

1. xml. This file will be used for each burger in the ListView. 2. com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="@dimen/item_outer_height"> 3. Next, declare a TextView, which we will use as a counter for the number of burgers being ordered. We will later access this through its ID: 4. The counter text size is exactly the same as all of the other list items in the application. However, it should be bold, so it can be easily identified and read: android:textSize="@dimen/item_text_size" android:textStyle="bold" 5.

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